How do I interface to an old digital meat thermometer probe? It has a stem with a wire and a mini-plug on the end?

The stem is stuck into the meat and is left in the oven. The wire is then brought out of the oven and connected to the display. I would like to replace the display with an AVR micrprocessor, but I do not know, or how to find out, what kind of signal is at the end of the plug. Has anyone played around with these and can share their experience?

Asked by cjh01 8 years ago


PLZ KINDLY SEND ME EASY CIRCUIT DIAGRAM HOW CAN I MADE A DIGITAL THRMOMETER & HOW I CAN TAKE THESE SIGNAL ON OUTPUT.

RESPECTED PERSONAL , PLZ KINDLY SEND ME EASY CIRCUIT DIAGRAM HOW CAN I MADE A DIGITAL THRMOMETER WITH DRIVING REVERSE & FORWARD 9 TO 12 VOLT DC MOTOR BY THE  ADJUSTMENT OF LOW / HIGHT TEMPERATURE .   OR HOW CAN I TAKE DIGITAL SIGNAL OF THERMOMETER ON AS A OUTPUT TO DRIVE MOTOR IN REVERSE & FORWARD MOVEMENT PLZ KINDLY SEND ME BOTH CIRCUITE WITH ATTACHMENT TO EACH OTHERS. PLEASE HELP ME . MY E-MAIL ID IS : taha_faheem@hotmail.com

Asked by TAHA_FAHEEM 8 years ago


Where can I find a Glass Encapsulated Digital Thermometer Probe? Answered

I have been searching for a glass encased digital temperature probe. Thus far I haven't been able to locate one. Can any one suggest an online site to search for one?

Asked by cdorris 3 years ago


Indoor Thermometer - Check temp at home while at work

Hello! I sure hope this qualifies as a Tech category! I'm looking to build (or possibly buy) an indoor digital thermometer that transmits the temperature information to my computer over the internet. The goal is to be able to check the temperature of my house while I'm at work, or anyplace else with internet access. Do any of you know of a simple way to build this? Has it been done before? With temperatures here in Washington DC breaking records this week (over 100F) I'm worried about my pets health at home, and more worried that the a/c will go out while I'm away and I'd never know. This could result in the death of my pets, and I'd love to be able to be informed in time if something were to happen and the temperature rose suddenly (or dipped, in winter). Help in the right direction is greatly appreciated!

Posted by Kindlekat 7 years ago


3 "outdor" thermometer in one display

Made a doodle draft http://www.pic-upload.de/view-15029884/534899_4018926638889_1477588234_n.jpg.html would like temperature and hydrometers in different rooms and display in my own room. anyone knows how to to or where to buy?

Posted by itge13 5 years ago


Talking Meat Thermometer - Circuit wizard help

Hi everyone  I am doing a project in university and i wanted to make a talking thermometer which told a blind person what temperature the meat was.  At the very best i wanted it to have different functions for chicken, beef and pork. (So they can cook a medium steak and then a safe temperature for chicken, although the temp for chicken and pork is above that of a beef so maybe i can fit it into one chip. i dunno) I have to make the PCB myself so i was just looking for any help on how i may do it (maybe a mix of a home made pcb and arduino) Any any tips or advice i may need  Thanks  Michael 

Posted by abro100 4 years ago


Cen-Tech Thermometer to PC Hacking

I just got my new $30 Cen-Tech thermometer from Harbor Freight and it's begging to be hacked. I would love to be able to use this thermometer as part of a closed loop system to control a hot plate for soldering purposes. Just inside the battery compartment is a header with four pins. They nicely labeled the pins on the silk screen. I'm probing on "Gnd" and "Tx" pins. I used a MAX232 level shifter to convert the TTL output to RS232 so I could connect to my PC. I then ran the attached simply Python app that dumps the data packets to the console. Each packet has 25 characters and repeats at about 3Hz. My question is, how would one go about decoding the data packets? Some numbers seem constant while other move. I'm hoping the data format is obvious to someone. Note, the reading on the display was around 68.8 degrees F when this data was collected. The readings did jump plus/minus a few tenths while collecting. Any ideas? Thanks, Jim Console Output: 33 15 11 00 3A 07 9B 14 1B 1E 82 FF 15 07 A9 12 F7 01 CA 0B 97 0C 00 00 4A 33 15 11 00 3A 07 9B 14 1B 1E 82 FF 15 07 A9 12 F7 01 CA 0B 97 0C 00 00 4A 33 15 11 00 3A 07 9B 14 1B 1E 82 FF 15 07 A9 12 F7 01 CA 0B 97 0C 00 00 4A 33 15 10 00 3A 07 9B 14 1B 1E 81 FF 15 07 A9 12 F6 01 CA 0B 97 0C 00 00 47 33 15 10 00 3A 07 9B 14 1B 1E 81 FF 15 07 A9 12 F6 01 CA 0B 97 0C 00 00 47 33 15 11 00 3A 07 9B 14 1B 1E 82 FF 15 07 A9 12 F7 01 CA 0B 97 0C 00 00 4A 33 15 11 00 3A 07 9B 14 1B 1E 82 FF 15 07 A9 12 F7 01 CA 0B 97 0C 00 00 4A 33 15 12 00 3A 07 9B 14 1B 1E 84 FF 15 07 A9 12 F8 01 CA 0B 97 0C 00 00 4E 33 15 13 00 3A 07 9B 14 1B 1E 85 FF 15 07 A9 12 F9 01 CA 0B 97 0C 00 00 51 33 15 11 00 3A 07 8F 14 1B 1E 82 FF 15 07 9E 12 F7 01 CA 0B 9C 0C 00 00 38 33 15 11 00 3A 07 8F 14 1B 1E 82 FF 15 07 9E 12 F7 01 CA 0B 9C 0C 00 00 38 33 15 11 00 3A 07 8F 14 1B 1E 82 FF 15 07 9E 12 F7 01 CA 0B 9C 0C 00 00 38 33 15 09 00 51 07 63 17 65 1D 81 FF 2C 07 2D 15 F1 01 00 0C 92 0B 00 00 35 33 15 0B 00 51 07 63 17 65 1D 84 FF 2C 07 2D 15 F3 01 00 0C 92 0B 00 00 3C 33 15 0A 00 51 07 63 17 65 1D 82 FF 2C 07 2D 15 F2 01 00 0C 92 0B 00 00 38 33 15 0A 00 51 07 63 17 65 1D 82 FF 2C 07 2D 15 F2 01 00 0C 92 0B 00 00 38 33 15 0A 00 51 07 63 17 65 1D 82 FF 2C 07 2D 15 F2 01 00 0C 92 0B 00 00 38 33 15 0A 00 51 07 63 17 65 1D 82 FF 2C 07 2D 15 F2 01 00 0C 92 0B 00 00 38 33 15 0A 00 51 07 63 17 65 1D 82 FF 2C 07 2D 15 F2 01 00 0C 92 0B 00 00 38 33 15 0A 00 51 07 63 17 65 1D 82 FF 2C 07 2D 15 F2 01 00 0C 92 0B 00 00 38 33 15 0B 00 51 07 63 17 65 1D 84 FF 2C 07 2D 15 F3 01 00 0C 92 0B 00 00 3C

Posted by jimk3038 9 years ago


Why doesn't my Arduino 'secret thermometer' print to LCD? Answered

[Solved] I've had my Arduino a few days now and have found this code: code.google.com/p/tinkerit/wiki/SecretThermometer. I have tried modifying it with a few basic LCD commands, which I have had working with a 16x2 LCD. I want it to print the temperature from "readTemp()", divide by 10000 (to get it in degrees C) and print to the LCD (with the "C" character after it). This is what I have so far: #include LiquidCrystal lcd(7, 6, 5, 4, 3, 2); long readTemp() { long result; ADMUX = _BV(REFS1) | _BV(REFS0) | _BV(MUX3); delay(2); ADCSRA |= _BV(ADSC); while (bit_is_set(ADCSRA,ADSC)); result = ADCL; result |= ADCH result = (result - 125) * 1075; return result; } int temp = (readTemp()/10000, DEC); void setup(){ lcd.clear(); lcd.begin(16, 2); lcd.print("Thermuino"); delay(2000); lcd.clear(); } void loop(){ lcd.setCursor(3, 0); lcd.print("C"); lcd.setCursor(0, 0); lcd.print(temp); // is this where the problem is? delay(1000); } But it does not work, I have checked all I/O lines,  different code etc. and they all work fine. So It must be a mistake in my programming. All I get is row 0 of the LCD full black all characters along it. I hope I have provided enough information for you to help :-D [EDIT] After removing the "int temp = (readTemp()/10000, DEC);" section and changing "lcd.print(temp);" to "lcd.print(readTemp()/10000);"  it now works! :-D It prints a correct temperature to the LCD and refreshes it.

Asked by DELETED_zoltzerino 8 years ago


Need help with DS18B20 1-wire thermometer IC

So I recently bought a DS18B20 1-wire digital thermometer IC to use with an arduino.  But when I hooked it up, I couldn't get any reading at all out of it.  I have the VDD pin wired to 5v on the arduino, the gnd wired to gnd, and the data pin wired to analog pin 0.  Any help would be awesome.

Posted by dudes 3 years ago


where can I find cheap thermistor probes like those found in digital meat thermometers? Answered

I've seen people use a copper lead soldered to a wick rapped around a thermistor, but I really want to use something a little more efficient than this.

Asked by Spaceman Spiff 6 years ago


ICL7107 and LM35 based 7-segment thermometer

I'm trying to create a digital centigrade thermometer based on an ICL7107 3 1/2 digit 7-segment driver/ADC and an LM35 linear centigrade temperature sensor but I'm having a few problems. There doesn't seem to be much online about using the ICL7107 with a LM35 and most of the schematics available are for volt meters, but that's not a massive problem as the LM35 gives 10mV/C linearly. I'm just trying to go based on the few schematics I have found but I'm wondering about the supporting components for the LM35 which seem a little too simple. The first schematic I found was from a Hungarian electronics forum and seems to depict a diode and amplifier being used for the temperature sensing which seems like a bad idea to me. The second seems more like what I'm trying to do. The other few things are the negative voltage source, the first schematic shows an inverter being used as does the datasheet, but the second schematic shows an LMC7660 voltage converter which seems like a better option to me. The second one does also show three diodes in series used to drop the voltage for the LED displays which doesn't seem like the best idea, but I can't think of a better way to do it without attaching resistors to each one as the number of lit segments will be variable. The supporting components for the ICL7107 seem pretty consistent between the two and the schematic so I'm confident those are correct, but I'm looking for some advice on how to connect the LM35 in a way that will give me an accurate readout. Thanks!

Posted by andy70707 4 years ago


help creating a biosensor prototype

I will attempt to be as concise as possible. That said, please bare with me if things are explained as well as they need to be, I am very new to this. Determined, but still a novice. I am conducting research as part of an effort to create a wearable prototype. Essentially, I need to combine a ppg heart rate monitor with a infrared thermometer (to measure skin temperature) and to have both devices maintain bluetooth capability. Any input in regards to this would be amazing.  More specifically, I am wondering if there are any DIY ppg heart rate monitor and/or infrared thermometer starter kits? Or resources that will assist with building these elements, aside from tutorials. I ask because it is a challenge to uncover all of the nuance and intricacies with electrical engineering and design without having a sufficient background.  For instance, it is clearly possible to add a bluetooth component to a heart rate monitor, but I am unsure if the two components (ppg hrm and infrared therm) must "talk" to each other while maintaining a bluetooth connection to a website or some other device.  If this is all as "simple" as building these devices separately and adding a bluetooth component to each of them, it would be greatly appreciated if you can provide a specific link to easy sources to obtain the components. I think I can follow along the tutorials, though there are still questions there.  Salud

Posted by ChrisU2 2 years ago


Need help wiring up this digital thermometer

I bought a thermometer and probe from McMaster-Carr, but didn't expect that it'd come without a power plug nor a clear way to wire it to the probe. Instead, there are a few connections at the back and I need a hand to make sure I don't break anything. Can anyone here help me identify the right way to wire this for 110v wall power? Do I put one end of the power cord into the 0 VAC socket, and the other into the 115 VAC? Also, the probe terminates in eyelets, where this wants a raw wire for the connection. I can snip them--is that right? And why are the probe wires red and yellow (the unit has inputs for TC+ and TC-). I've attached a photo of the rear of the unit. Thanks for your help everyone. EDIT: I did some research and figured out that my hunch was correct. One connection to 0VAC, the other to 115VAC, and the probe leads into the other side. Works great, too.

Posted by mikejs 9 years ago


I have a electric heater that uses a dial, can I link it to a machine to turn it on/off depending on the temperature?

The electric heater is not linked to a thermostat and has a dial (rotates between 120-150 degrees range) on it to control its intensity. I am thinking perhaps to link it to a thermometer to control its intensity when it reaches some temperature thresholds and depending on the time of the day (preferably a schedule). Pics available on request

Asked by knightdaemon 8 years ago


analogue-digital cmos chips? Answered

Is there a chip like the LM3914 that takes an analogue voltage input and turns it into a digital signal? (preferably BCD, but decimal is fine too), but without the inverting output, so I can use it with other CMOS chips? I basically just want a chip that takes an analogue signal, and based on a threshold, divides it up into a decimal (or binary) signal. Specifically, I want to use it with a thermistor and a 7-segment display to make a digital thermometer.

Asked by andy70707 6 years ago


LM35 thermometer? Answered

I want to make a theromoter with pic16f88 and LM35 sensor and show the results on a 16x2 lcd plzzz  help me out

Asked by robot1398 6 years ago


Tutorial: LCD Thermometer with optional Alarm

I created this Arduino tutorial. I hope somebody finds it helpful! Feel free to post any comments or suggestions. http://wellsb.com/post/1328196426/arduino-lcd-thermometer-with-optional-alarm

Posted by 5m0k3 7 years ago


making a VOM into a thermometer?

Anybody know how to make a VOM into a thermometer?? Thanks BTW, I made the paracord belt from instructables, many, many months ago, the belt has been the best belt I have ever owned thanks to instructables jack

Asked by jackhg 7 years ago


Thermocouples?

I have a multimeter which has a thermocouple I can plug in to get a temperature reading. I really like the thing, but the thermocouple itself isn't all that robust. Although the meter is capable of reading temperatures up to 1850F, I doubt the thermocouple would last long at only 400-500F. My question is, is it possible to buy another thermocouple and use it in place of the provided one and still get fairly accurate temperature readings? I was thinking of maybe using a thermocouple normally used in furnaces or hot water heaters.

Asked by tylervitale 6 years ago



741 Signal amplifier Answered

How would I go about creating an amplifier using an LM741 to amplify a 0mv-400mv signal to a 0v-4v signal? All the circuits from google or textbooks don't work, or produce strange oscillations. The only way I can get it to work is in inverting mode, where I can get -4v-0v out, which isn't very useful. My specific application for this is for a digital thermometer. I intend to amplify the 0-400mv analogue signal from an LM35 linear temperature sensor, then somehow sample that without using loads of logic or transistors and convert it to decimal or binary, then drive a dual 7-segment display to show the temperature. I have a prototype made using 20 comparators and 10 xor gates, and countless diodes, so if anyone could advise me on an easier way to do that, that would be great. And no PICs/AVRs, I know how to use them and have programmers, but I prefer to do "real" electronics using CMOS chips.

Asked by andy70707 6 years ago


How does sweat evaporate? Answered

 Water turns from liquid to gas at 100ºC. Salt water at an even higher temperature.. Sweat absorbs thermic energy from our skin, which cools the skin and allows the sweat to evaporate.. But how does it reach over 100ºC just from the skin and how comes that we can't feel it?

Asked by ricardjorg 8 years ago



How much time does a chicken,take to roast in a wood oven. I have a thermometer and a probe.. Fernanda Birrell

How much time does a chicken,take to roast in a wood oven.  I have a thermometer and a probe..The oven is a domed pizza oven 1m sq. Fernanda Birrell

Asked by fernanda birrell 6 years ago



Thermometer for furnace

OK I have created Shark500's furnace (which was an awesome Instructable). I have made some modifications to it. Now I'm curious can some one help me make a inexpensive thermometer for it? I have made mine a bit bigger and I am using a 16oz propane tank as my crucible with about a 1/2" thick cement coating on it and the top is my lid. I figure I could wire a sensor through the old valve but I don't know where to start to make something like this. could some one please assist me in this it would be greatly appreciated.

Posted by Jdogg55 9 years ago


Mercury??? Answered

Well i have seen some "places" that sell mercury (dont ask me where), and I was wondering what would someone need mercury for, other than making a thermometer?

Asked by bwpatton1 8 years ago


LM35 Sensor? Answered

I wanted to know how to convert the readings from a LM35 sensor to Celsius and Fahrenheit.I need them for a thermometer application. I would also like to have the arduino code to serial print the values 

Asked by Bot1398 6 years ago


xbox360

Thank you for telling me the 220 degrees C + temperature. With my heat gun .eletric heated pan and a IR thermometer I got the GPU off.But I think I ruined it.So will by a new one off ebay with the solder balls already fixed -Keith tait

Posted by iamkeithtait 6 years ago


Can I use a regular digital thermometer as a cylinder heat temp gauge?

Hey guys, I want to make a cheap cylinder head temperature gauge for my 150cc scooter. I have owned one before which worked well but it was rather expensive. I'm more interested in being able to detect a temperature spike and avoid a blown motor than determining an acurate temperature. The last gauge I owned used a probe with a ring on the end that acted as a washer between the spark plug and the head. If I buy one of these probes:  http://www.ebay.com/itm/Thermocouple-CHT-Sensor-Probe-Cylinder-Head-Temperature-14mm-/120861470119?pt=LH_DefaultDomain_2 And a digital thermometer with a probe like this: http://www.ebay.com/itm/Digital-Blue-LCD-Temperature-Meter-50-150-Probe-/230650228821?pt=LH_DefaultDomain_0&hash=item35b3d33055 Could I just splice the wires together and be away laughing? I'd need to find out what the temp range of my engine is first.....my last 2-stroke 150cc ran at about 275F and melted at 400F, 4-strokes should run cooler right? Any thoughts would be appreciated :)

Asked by tig5 6 years ago


Assistance with a seemingly strange pirani gauge

I'm working on a vacuum system and so far things have gone unusually well for my projects and I really hope to keep doing well on it, but I'm hung up on the vacuum gauges. I've got a PR10-S Edwards Pirani gauge and the internal circuitry is strange. I can't find any literature on it anywhere or any schematics close enough to fudge. So I'm hoping I'blers might have a clue as to what is going on here. EDIT: Added a re-drawn circuit in an estimated configuration After some googling, a 3-wire resistance thermometer seems close to what I have as thats essentially what the gauge is, a clever application of a resistance thermometer.

Asked by The Ideanator 6 years ago


What should the internal temp of properly baked bread be?

Is there an optimal internal temperature that bread should have to be neither underbaked nor overbaked? I saw a bread recipe recently which called for the use of a precision thermometer to take the bread's temp, but I haven't seen any other recipe suggesting this. 

Asked by Mileman2010 6 years ago


Water valve on/off control

Need some help! I need to know what to buy. I need to control water flow with an electric water valve to open when the water temp reaches 65 degrees and shut off at 55 degrees. From the valve, thermometer, etc., what do I need to buy and how can I wire it? I know it’s the same concept as a HAVAC thermostat in your home, but I don’t know how to wire it to a relay for the valve.

Posted by opc167 7 years ago



Problems with my CHT (cylinder head temp) gauge.

I have a k-type thermometer mounted on my 12v scooter with a k-type thermocouple running under the spark plug. Things were working ok until I hooked the setup on to the bike itself, powering from the ignition. Now the gauge just reads 0.00C or will rise up to temp and then quickly go back to 0.00. Anyone got any ideas? Is it a voltage/power problem? I've checked all connections. Unit seemed to be working fine on a 12v aux battery I had in the house.Any thoughts appreciated.

Asked by tig5 5 years ago


Why are you using a scale? ? Answered

I just started making breads and Pizza dough this past month. and every batch is better then the last. Quick side note, i recently got diagnosed with breast cancer, major mind frick considering i am male. My mom had me move back in with her, so I have invaded her kitchen. she has an awesome kitchen for making breads, cakes and candy, i recently discovered the candy thermometer in the drawer. but this idea of a scale is odd, i use measuring cups and spoons. I really want to follow along in this bread making class. but i hope its not a hindrance that we dont measure with a scale.

Asked by Leathaldose 6 months ago


Idea for extended version of "Sun Jar"

After seeing the recent Sun Jar I'ble, I had an idea (not even concrete enought to be a Completable) for an interestingly extended version. There now exist LEDs for infrared, visible red, green, and blue, and near UV.It should be possible, with a mix of small low-voltage constant-current power supplies and pulse modulators, to construct a multiple-LED light source which roughly models what we perceive as the solar "spectrum." I don't mean formally reproducing the raw wavelength distribution, but rather the combination of intensities we see (or measure with a thermometer) in a prism- or grating-spread spectral display.Coupling such a circuit to a solar cell would allow you to build a "Sun Jar" which "collects sunlight" during the day and "releases sunlight" at night. As I said, just an idea...

Posted by kelseymh 9 years ago


peltier cooling/heating system for transportable animal incubator

I am trying to design a heating system for an animal incubator that can be transported in a car to rescue animals and keep their body temperature level. I was thinking of using the peltier systems to heat the box the animals will be staying in but I'm not sure if they would have the capability of 70-90 degrees fahrenheit. Also the temperature needs to be very specific (plus or minus 1 degree) is there a thermometer out there that would work well for this? I just need some help on learning about these because I've done a little research but I'm still confused on how they work and if I could even use them. Also, is there a good website to buy these on? I could use a lot of little ones or one medium sized one (up to 1ft by 1ft) but not too tall.

Posted by oabf19 9 years ago


Peltier Cooler/Heater - Pooling Brainpower

I recently acquired a thermoelectric mini fridge. As a fridge, it doesn't work so very well - it will get down to ~50 degrees with an ambient temperature of 70. So, I took it apart. You know the saying: "If it ain't broke - fix it until it is." So I now have a peltier effect cool/heater. I put my meat thermometer on the cold side with the fan off - and it gets down to freezing (probably a bit below). On the hot side, with a big sink and fan - it seems to be ~85 at it's warmest point (this sink is about half a square foot and an inch deep). Ideas on where to use? It's 110 service.... It literally almost killed me a few days ago when I touched a transistor sink that was part of the rectifier circuit while holding a plate that was grounded (I got knocked out for a few seconds) I've got a couple ideas, I just figured I'd pool brain power and see what happens :p

Posted by trebuchet03 10 years ago


A Transatlantic Tunnel, Hurrah!

Deep beneath the Atlantic Ocean, forgotten for the best part of a century, lies a tunnel linking London and New York.It was built on the whim of a Victorian inventor with the aim of linking two great cities and developing the kind of friendship that still exists today.But bad fortune befell the venture - and the tunnel lay idle ever after.Until today, that is.One end of the "tunnel" emerges next to Tower Bridge on the banks of the Thames in London - the other is next to Brooklyn Bridge on the banks of New York's East River.It looks like something HG Wells might have imagined.Each end has a giant telescope-like construction which appears to punch its way out of the earth.There are dials, and levers, and thermometer gauges on the side of the 20m long brass and wood construction.Peer into it and you can see people on the other side of the Atlantic.Wave at them, they wave back at you.Web-cam it ain't, but the Telectroscope is fascinating. I hope it's stays operational for quite some time.Telectroscope websiteDaily Mail articleBBC StoryBBC Video

Posted by Kiteman 9 years ago


ZVS Induction Heater help?

Hi, I tried to build a ZVS induction heater using this circuit http://img413.imageshack.us/img413/5136/inductionm.jpg , but I had no sucess. The work coil is 10+10 turns of 22 AWG wire around an old highlighter casing, and I am powering the circuit from a working 12 volt 7ah battery. The circuit works with my flyback transformer, but does not work on the induction heater. I am using all of the standard components in the flyback circuit, but I replaced the 5+5 turn primary with a 10+10 work coil. As far as I mesured with my thermometer the temperature of the object never increases over 1 degree (I am trying to heat copper wire or a small picture nail). Does anyone have some suggestions? Edit: Sorry about the delay, but I was able to heat a large paper clip using 8+8 turns of 16 AWG wire wrapped around a glass test tube. This time I used a huge 24 volt center tap 18 amp transformer to get 12 volts.

Asked by TimTD 7 years ago


Group : Collection of Instructables for class-room and teaching purposes ...

Hi !I created a group that seems not to have been ever created here yet."Class-Room" group.The main purpose of this group is to make a collection of every instructables that may be useful for school teaching, and that may be reproduced by pupils or students as science-fair or class-room projects ...Please, add your Instructables if they fit this description._Biology :"Be a Scientist : map your skin"Chemistry :"Carbonating""Kitchen laboratory II : The CO2 trap""Make crystal clear ice !""Make Rheopectic slime in less than 15 minutes !""Shelling a raw egg !""Sodium Acetate"Investigations :"Amazing Kite For Under $5""How to make Playdough (Play-doh)""Oobleck""Pop-Up 3D words and messages !""The Huffin' Hoopster""The Improved CD Hovercraft."Physics : Electricity & Electrostatics :"Build an Electrostatics Motor""Jacob's Ladder Sculpture from found materials""Kelvin's Thunderstorm : Create lightning from water""Paper Resistor"Physics : Instruments & Measures :"Be a Scientist : Make your own force-meter.""Be a Scientist : Make your own thermometer"Physics : Magnetism :"A simple mechanical resonance demonstrator""Diamagnetic Levitation Experiment"Physics : Optics :"Naff Movie into _DVD-Spectra_""Optical Water-Prism"Physics : Sound :"How to measure the speed of sound ...""Mechanica Wave Driver for Chladni Plate"

Posted by chooseausername 10 years ago


Help with JARVIS-like Smart Home

Hey guys, I am planning to do a project with Smart Home theme. I would like to create JARVIS-like application, which would be able to recognize my voice and then do appropriate action. Example: Temperature Sensor Me: "Jarvis, Show Temperature" Jarvis: -"Temperature displayed sir" I am planning to buy a very cheap Tablet, on which I would like to write an Android Application, which would create "jarvis" and other activities. For example, if I say "Show Temperature" the activity would pop up, where the temperature will be displayed. I will messure temperature with a Thermometer (DS1280 most probably). And I'd like to use a Bluetooth module to communicate Wireless with them. Temp. Sensor -------- > Arduino board ------------> Tablet All of the above are on different locations. I need help with this project, so if anyone could do an instructable on how to do this - would be really awesome! What do I need ? - Temp. Sensor - Bluetooth Module - Arduino Mega - Speech regonition software (BitVoicer probably) - anything else? Also, is the TFT display (http://www.geeetech.com/wiki/index.php/3.2TFT_LCD) good enough to replace the Tablet ?  Meaning, can I write such an Application to this display ? Thanks, David

Posted by DavidDaVinci 3 years ago


Heating Element for DIY Melting Point Apparatus

Hi Everyone, this is my first post on this site!  I am seeking advice to help me construct a home-made melting point apparatus (M.P.A).  A melting point apparatus allows it's operator to determine the melting point of a chemical sample by heating it in a controlled fashion and noting the temperature when the sample melts.  I have most of the design made up in my head, but I'm not sure as to how I can obtain the proper heating element.  The heating element I am seeking is an emulation of the M.P.A.s heating elements in my school's chemistry lab, which look like this: a metal block (about 3cm tall by 2cm deep by 3 cm wide) with vertical holes bored into the face with a pane of glass pressed against said holes so a glass capillary tube (containing the sample) can be slid into the bored hole and viewed through the glass pane as the sample is heated by the metal.  Another hole is bored into the metal, adjacent to the sample hole, for a thermometer.  So again, my question is do you have any suggestions as to where I could by a heating element like this?  Or, any suggestions on how to build one?  I have a jewelry shop at my disposal so I can probably bore any holes myself.   Any suggestions will be appreciated, thanks!

Posted by Das Horse 6 years ago


How to add a memory function when I push a button

I have a proyect with a MLX90614 (an ir infrared thermometer with I2c), and the output temperature is displayed in a oled 128x64 I2c, I am using an arduino pro mini, the code works well, but i want to add a function: I want to press a button that saves the temperature shown, in the right down corner of the screen, and if I press it again to save again the temperature. It is like a memory function, I searched on the internet and I discovered that there is a memory in the arduino called eeprom but i have problems combining that function with the code. Any help appreciated. Thanks. Code: #include "U8glib.h"            // U8glib library for the OLED #include               // Wire library for I2C communication #include // MLX90614 library from Adafruit Adafruit_MLX90614 mlx = Adafruit_MLX90614(); U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NONE); // I2C void draw(void) {   u8g.setFont(u8g_font_profont15r);        // select font   u8g.drawStr(1, 12, "Object Temperature");//   u8g.setFont(u8g_font_profont29r);        // select font for temperature readings   u8g.println("°C");                        // prints C for Celsius   u8g.setPrintPos(35, 55);                 // set position   u8g.println(mlx.readObjectTempC(), 0);   // display temperature from MLX90614 Serial.println(mlx.readObjectTempC(), 0); // u8g.drawRFrame(15, 20, 100, 30, 10);     // draws frame with rounded edges } void setup(void) {   Serial.begin(9600);     mlx.begin();  //Receive data from the sensor } void loop(void) {   u8g.firstPage();    do     {      draw();          }   while( u8g.nextPage() );     delay(1000);  // Delay of 1sec }

Asked by tmercados 8 months ago


Car Heater/ Warmer

Hello I am Melwin from India I want to create a Car Can/ bottle Warmer/ Heater. My Basic Aim is to make hot water for preparing baby formula my baby when I travel with family in my car. This way I can avoid multiple stops for getting hot water. The commercial versions are available in the Market for a minimum of 3000 Rupees. It is very rare to buy in India My plan is to buy a 220 v 1000Watt Heating Element and cut it to suit to 12v When i measured one test setup with such a coil I get around 1.5 Amps per coil. I didnt have a thermometer to test how hot it gets. Since the car Cigarette Lighter supports 10A. I can easily Add 4-6 Coils of the same length in parallel. Also I can add switch to get different temperatures by adding up coil for each switch. 1-2 Coils = Warm. 3-6 coils = Heat. I dont want it to be a huge cooker. It should be able to heat up a glass (200 ml ) of water till 50- 60 degrees C) A higher version can have a Thermostat to cut off things as a safety feature. If this setup succeeds in boiling up water then I can also have my favourite cup nooodles when on long trips with friends I plan to make a small ceramic frame to mount the heating elemmet. On top I will place a Copper plate. Leaving some gap between the Plate and coil. This entire setup will sit in a Tin can of suitable diameter. I need to think about how i get the ceramic frame to Sit inside the can without touching the Metal. To this Metal can i will attach a handle so that it can be handled when hot. My next question. Where do I place it in my car safely. Suggestions/ Concerns/ Comments please Melwin

Posted by melwinmyworld 6 years ago


Let's Make Soap - A Cold Process Soapmaking Tutorial

I get a lot of curious people downtown who want to know how to make old fashioned, cold process soap. So for anyone who is interested in what making soap is all about, here's an overview of the soapmaking process. It is not meant to be used as a tutorial. Because of the many dangers associated with soapmaking due to the use of lye and the plethora of information to be had, I recommend that you carefully research the process before starting out on your own. Details on where to obtain additional information will be included within this article.Soapmaking involves a chemical process in which sodium hydroxide (lye) reacts with oils to make soap. This process is called saponification. Because this process requires the use of lye, important safety precautions must be taken. Rubber gloves and safety glasses should be worn during the soapmaking process, and vinegar, which neutralizes the lye, should be kept on hand in case of an accidental spill or burn. In addition to the necessary safety equipment needed for the journey into making soap, there is other required equipment you'll need to get started. First and foremost you will need to acquire lye. Because without lye, there is no soap. You should be able to find lye in the plumbing section of your hardware store. I buy Roebic brand at Lowe's. The brand doesn't really matter, but it must say that it is 100% sodium hydroxide. You'll also need a large pot for mixing the soap. This can be any type of pot you like - I use my hubby's old beer making pot - as long as the pot is not aluminum. Lye reacts badly with aluminum so remember to never mix the two. You'll also need an accurate scale, I use a digital postal scale I purchased at Staples. And, you'll need a thermometer or two to measure the temps of your oils and lye solution as well. Additionally, you'll find that a stick blender is your best friend in making soap, and then of course there are the molds, soapmaking oils, and distilled water to be mixed with the lye. Read the rest of this tutorial.http://soapdelinews.blogspot.com/2009/03/lets-make-soap-cold-process-soapmaking.html

Posted by soapdeli 9 years ago


Heating Control

I have been thinking for some years now that I would like to have finer control over my central heating. The problem Now we are older we feel the cold more so in winter the heating is on all the time. This means that we have to keep altering the thermostat on each radiator at different times of the day or just leave them and so waste energy. One method means wasting energy but the other means rooms will be colder than we want initially.   The system and what i have We have a combination boiler which has a digital timer and also on the panel are temperature controls for hot water and radiator temperature. Each radiator has a thermostatic valve so each room can have it's temperature set independently. I have a computer which runs 24/7 and also a bit whacker which I can control via python code and electronics has been a hobby for over 50 years My idea I would like to have some system which would allow me to adjust each room temperature via computer control.   Possible solutions Solution 1 Fit a stepper motor to each thermostatic valve to adjust it at different times of the day/night. This would allow precise control but would be quite expensive to set up. Solution 2 Fit a small structure round each valve with a filament bulb or resistance wire in the bottom so that when power is applied to it then the temperature around the valve will rise and so the valve will close or, at least partially close. I think this would be much cheaper to implement but would have the small on-going cost of using power to the bulbs whenever the room temperature needs to be cooler that it would normally be. My initial plan Build a small structure around one of the valves with a low voltage bulb in it. It would have vents at top and bottom and so air would circulate. I have a portable digital thermometer so i could gather information and try different bulbs to see how much power would be needed and therefore what the on-going cost would be. Also try various shapes of structure to see what the effect would be.   So guys what do you think?

Posted by buteman 8 years ago


laptop queries?

I have had my gateway t-16 for about a month now, so no ive decided its time to start considering modifying it. i just recently got a new battery for it, only $47 off ebay. but ive got some issues with this laptop. well, not really issues but things i have a problem with. first off, the laptop has a phone line modem, im never going to need it, so im wondering, if i remove the modem card from inside the laptop will it continue to run properly? second, there is the Realtek wireless card, for barely average wireless connection distances, the card gets extremely hot, i dont have a thermometer, but i can easily say its hotter than 50 degrees, my cpu is at 41 degrees right now and the card is a lot hotter than it is (to the touch) third is the cpu itself, it can be a low enough temperature to turn off the fan, but thats quite rare, the fan is almost always running. ive been thinking about taking advantage off all the space in the cpu area and make a heatsink assembly that goes on top of the heatpipe, right above the cpu. the cpu is only at 40 degrees right now because im not doing anything, sometimes even low requirement games will shoot up the temperature to 70+ degrees, in just a few cases (less than 3) the laptop has shut itself off because the cpu reached its thermal limit, 95 degrees. i cant even watch the ben heck show without worrying about the temperature, and no form of cooling pad helps, cpu cover on or off. the cpu cover is also a problem, there is no direct intake for the cpu fan, the cover has no vent right there, just a spot where the plastic is a bit higher, otherwise the air for the cpu is drawn from the motherboard side, where the air is already warm from the chipset, im currently running the laptop with the cpu cover off. the ram gets warm, but its not out of any ordinary operating temperatures. last and certainly not least, is the apparent lack of bluetooth in my laptop, the case is even designed with a space for a bluetooth module, and there is a connector on the motherboard for a bluetooth module, and if i had one, i would put it in. what really bothered me is the fact that the gateway service staff had insisted that i was seeing things when i saw the bluetooth coneection, and that there was no way in the world that my laptop could have internal bluetooth. this ticked me off, because they designed the laptop and they dont even know whats inside it. i could definitely work around the heat problems if there were some really small blower fans, but im not sure if such a thing exists. also, why would my wireless internet turn off (and not turn on) when i plug in a usb flash drive?

Asked by zack247 6 years ago


Global Warming Experiment #1

(I slightly changed the instructable into a forum topic and an instructable)The Instructable Half"Global Warming" Experiment #1:As you can tell by my quotes around "Global Warming", I personally don't believe that this theory is happening. Theres facts I can use to prove this. However, even I believe that no matter how you put it, there's going to be some bias. Also facts are boring :PSo, what I have planned, is to do a series of experiments on what global warming might cause if it were real.I'm doing this because I've heard people claim some extraordinary things, which based on data won't happen.I could post an instructable with a bunch of facts, and I might. But for now, I want to set up a couple collaborative experiments. One reason I want collaboration is I'm biased. The other, is so you can't complain about my methods.I haven't done the experiment yet, I really don't know if this will help, or hurt, my case.The experiment is to determine if "global warming" could melt glaciers, thus cooling the ocean. Notice here I'm assuming global warming is happening. It isn't. But when people make claims on the news and stuff, they are assuming that too.Please comment if you would like to change my methodology, OR you want to do the experiment.I'm going to describe how the Instructable (and hopefully the rest in the series) will work.1) I, or anyone, proposes a framework for an experiments and writes up an Instructable. (Will be referred to as "I" in the following steps)2) I monitor the suggestions, editing and fixing as needed. After about a week or so, I go onto step 3.3) I preform the experiment to the best of my ability, and write up an additional 2 steps.3a) The first outlines my changes. This could mean I didn't have a 4x8 loaf pan, and I had to use a 3x8. Or it was plastic. Whatever. These small details are important3b) The second outlines the data and conclusion. This may have images of the experiment, graphs, tables, sensor data, Whatever. I also make a note of my previous bias.4) Wait for more people to run through the experiment, adding them as collaborators.5) Write up a conclusion to everything, OR do some more investigating.Its not that bad, however the whole process might take a few weeks. (I don't know)Scientific MethodThere are seven steps to the Scientific Method, which we will follow:1. Define the question2. Gather information and resources3. Form hypothesis4. Perform experiment and collect data5. Analyze data6. Interpret data and draw conclusions that serve as a starting point for new hypotheses7. Publish results(Thanks Wikipedia!)#1 was done in the introduction.#2 I've already done, however you only have to look into data you'll need during the procedure.#3 I've done it, but I'm not telling you (I don't want a bias, even though I've hinted towards my guess)#4 - We're going to expand this out. More later!#5 and #6 sort of come together in this format, will be done as we go along.#7 is done as we go!Okay, #4. Remember back to High School, remember Lab Reports? Well basically there will be a step for each segments (leaving some out). We sort of do this already in most instructables "What will happen", "What you need", "How you do it"; this time more formally. Due to Lab Reports being unstandardized, I'm breaking it down into:IntroductionMaterialsProcedureDataIts shorter than your average one, due to the fact in Data, you have hypothesis and stuff I don't want to reveal yet ;-)The following is the framework, you can also see my instructable:(This is a framework, remember. Its not supposed to be "done" and perfect)Materials*Large basin of some sorts.*Water*Ice*Lamp + Light bulbs (100W & 40W)*ThermometerProcedure1) Fill large basin/pan with water.2) Take and record standing temperature of water.3) Add ice off to one side of the pan.4) Take temp. of water every five minutes until it starts to level out, at least 4 readings.5) Replace water, and repeat steps 2&36) Shine lamp w/ 40W bulb off to the non-ice side of the pan, but allowing some light & warmth to reach the ice. (Roughly 20-35%)7) Repeat steps 4&58) Repeat step 6 with a 100W bulbTake pictures throughout!What now?Okay, I'll be updating this with your comments over the next week or so. If somethings wrong with it, POINT IT OUT!!! I'm going to add my thoughts in as well. (I still feel its missing some things, I can't put my fingers on them, though!)

Posted by zachninme 10 years ago