Temperature control

Hey I am wondering how to make something to shut off a heat source at a certain temperature. The heat source is a normal appliance that is plugged into the wall.

Posted by lun0s 9 years ago  |  last reply 9 years ago


if 33 degree celsious falls on 1 square-feet surface for 1 hour mean what will be temperature after 1hr in that area?

How much temperature increased in that place ?

Asked by vickyraja 4 years ago  |  last reply 4 years ago


fluctuating temperature control? Answered

Hello.. pls manage with me as i am weak in english.. the controller i am discussing below is theoretical and the values i am using is completely ideal and not getting into complete circuit detail but focusing on just the function of them.. suppose i build a simple temperature controller which would just work as a simple on/off switch using any temperature sensor attached to a buffer circuit... a relay is connected to the buffer and the relay performs the switching action at a temperature set by a potentiometer in the sensor circuit.. suppose a fan is switched on when temperature reaches 60degree celcius and the place starts cooling down to 59.9 (+/- some percent) d celcius...the sensor sees the change and switches off the fan even at .1 degree change...and when the temp rise by .1d it would switch on again...(just my theory..not sure) question: how to make the fan be switched on until the temp drops till 55d celcius(or any other value)? (or some time gap like 15mins)? thanks for bearing my long question but i wanted to clear myself... as i am a little new in electronics and want to start by making such simple things thanks

Asked by hussainb 8 years ago  |  last reply 8 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 7 years ago  |  last reply 7 years ago


temperature logging with raspberry pi

New here, and to Pi/Python looking to log data from a few different sensors from Atlas Scientific (RTD & PH).  I've gotten really stuck so fare in getting these going and was wondering if anyone here can help me out.  so far I've used this code:  import smbus import time import datetime #SMBus(0) - Raspberry Pi Model A #SMBus(1) - Raspberry Pi Model B bus = smbus.SMBus(1) #I2C address of sensor address = 0x66 def temperature():     rvalue0 = bus.read_word_data(address,0)     rvalue1 = (rvalue0 & 0xff00) >> 8     rvalue2 = rvalue0 & 0x00ff     rvalue = (((rvalue2 * 256) + rvalue1) >> 4 ) *.0625     #print rvalue1, rvalue2     return rvalue print("Temperature Data Logger\n") while True:         #Open Log File     f=open('tempdata.txt','a')     now = datetime.datetime.now()     timestamp = now.strftime("%Y/%m/%d %H:%M")     outvalue = temperature()     outstring = str(timestamp)+"  "+str(outvalue)+" C "+str(outvalue*1.8+32)+" F"+"\n"     print outstring     f.write(outstring)     f.close()     #log temperature every 10 seconds     time.sleep(10) I've got the two sensor boards connected to the raspberry pi 3 mounted via a Whitebox Tentacle T3.   The boards are in i2c mode and i can see them using sudo i2cdetect -y 1 (they show up address 63 and 66)  but when i run this program above I just get a red error light when it reads the temperature.   The log file reports a measurement of 2C and 35.2F which is not correct but the red light on the board tells me that the Pi is trying to connect with it.   Anyone able to help?

Posted by Chair_t 1 year ago


PVC pipe at low temperatures

I have a question for spudgunners and other people who know about PVC. I've heard that PVC becomes bitter at low temperatures, so you shouldn't expose your spudgun to low temperature, but is it okay to leave it out in the cold and then warm it back up for use later? Does that affect the strength of the PVC? I have a problem storing some PVC in an heated environment during the winter.

Posted by starwing123 10 years ago  |  last reply 10 years ago


Temperature sensor using LTC2984

Dear Sir, I am using following device to measure temperature accurately,http://www.linear.com/solutions/5500 According to datasheet, the eval board can show a virtual temperature output using built in thermocouple thermister, RTD etc in ADC mode . http://www.linear.com/product/LTC2983, I need to measure real temperature which they apply in Heat bath or temperature calibration set up. I dont have such set up now, could you kindly give me a way out that without those set up I could manage Thermistor ? Kindly go through the page 43-47 in this datasheet, http://cds.linear.com/docs/en/datasheet/2983fb.pdf. Thanks in advance.

Posted by Hasan2015 3 years ago


Loss of temperature sensation in fingers? Answered

I've never had this problem until now...here's the story. Well, I was outside the other day, and it was freaking cold out. Probably about 9 degree's F. I was wringing cold water out of a towel (long story) and the cold really hurt my fingers. First my fingers felt cold, then nothing...just this buzzing sensation. Realizing that wringing water out of a towel with bare hands at 9F is probably a stupid idea, I rushed indoors and defrosted my hands with warm water. But all I felt was buzzing, not warm water. Hmm. So today I was melting wax in a soup can in boiling water, and I touched the tin to see how hot it was. It didn't feel hot, so I just grabbed the boiling hot tin of wax and poured it into my mold. The wax dribbled onto my fingers. I didn't even notice it! Later that day it occurred to me that maybe i was having trouble feeling how hot things are, so I experimented. I ran hot water over my fingers, but it didn't feel hot at all. It just feels like my fingers are buzzing or something.  Stranger still, if I IMAGINED that the hot water is cold, it suddenly feels cold! If I imagine it's hot, I get that buzzing sensation. It's probably just a temporary condition, so I was wondering if it's ever happened to any of you folks?

Asked by nepheron 7 years ago  |  last reply 7 years ago


Exhaust Fan that turns On at an adjustable temperature and Off again at a lower temperature? Answered

OK, I've looked all through the postings, and I just can't find what I'm looking for. I've built an enclosure for my pet snake, and I would like to add an exhaust fan that comes on at a certain temperature, and then shuts off again when a lower temperature is set. I don't wish to use Arduino because I'm guessing that there is a fairly simple (cheap) method to do this using a temperature sensor, a 12V DC computer fan, and maybe a potentiometer (so I can adjust what the temperature is held at). Although I have the ability to solder, and I can read circuit diagrams....I lack the basic knowledge to create them for myself. I already did an internet search, and didn't come up with what I was looking for either. I'd rather not spend $60-80 for a store bought unit. Any help would be appreciated.?

Asked by mvingtargt 9 years ago  |  last reply 9 years ago


arduino bt and LM34 temperature help with code

I have an issue i hope someone can help me with. i have an arduino bt and would like to use 3 LM 34 temperature sensors. I have found code for one of these sensors and works well. My problem is with code...i don't know any. I would like to add 2 more of these same sensors and have them print out like the current program that someone has written, i have posted the code below.// Define which analog input pin we have connected to the temperature sensor#define TEMP_SENSOR_PIN 0#define ANALOG_VOTLAGE_REFERENCE 5void setup() {Serial.begin(115200);}void loop() {// prints the currrent temperature with 2 place after the decimal pointprintFloat(getTemperature(), 2);// print a carriage returnSerial.println();// rest 1000 millisecondsdelay(1000);}float CtoF(float c) {return ((c -32.0) * 5.0 / 9.0 ) * 9.0 / 5.0 + 32.0 ;}float analogInToDegreesC(int inputValue) {return inputValue / 1023.0 * ANALOG_VOTLAGE_REFERENCE * 100.0;}float getTemperature() {return CtoF(analogInToDegreesC(analogRead(TEMP_SENSOR_PIN)));}void printFloat(float value, int places) {int digit;float tens = 0.1;int tenscount = 0;int i;float tempfloat = value;float d = 0.5;if (value < 0)d *= -1.0;// divide by ten for each decimal placefor (i = 0; i < places; i++)d/= 10.0;// this small addition, combined with truncation will round our values properlytempfloat += d;if (value < 0)tempfloat *= -1.0;while ((tens * 10.0) <= tempfloat) {tens *= 10.0;tenscount += 1;}// write out the negative if neededif (value < 0)Serial.print('-');if (tenscount == 0)Serial.print(0, DEC);for (i=0; i< tenscount; i++) {digit = (int) (tempfloat/tens);Serial.print(digit, DEC);tempfloat = tempfloat - ((float)digit * tens);tens /= 10.0;}// if no places after decimal, stop now and returnif (places <= 0)return;// otherwise, write the point and continue onSerial.print('.');for (i = 0; i < places; i++) {tempfloat *= 10.0;digit = (int) tempfloat;Serial.print(digit,DEC);// once written, subtract off that digittempfloat = tempfloat - (float) digit;}}

Posted by rodgard 10 years ago  |  last reply 7 years ago


How do I wire up a TCS-4010 "Love Control" temperature controller? Answered

I wired it up the way the instructions seemed to say and it just popped and sparked.  I am trying to use this temperature controller to control a band heater.  There is a pic of it.  I uploaded a pic of the schematic too.  I guess what I am asking is if someone could explain in a few paragraphs how I wire this thing up.  Maybe you could make a video explaining it and post it in here.   My band heater doesn't have a ground but my plug does.  Do I connect the ground to anything? Is the "load" and "common" the same.  It is "load" in the diagram and "com" on the controller Thank you -Jacob

Asked by Noblenutria 3 years ago  |  last reply 3 years ago


How do regular rechargeable batteries do in cold temperatures?

How would regular 1.2V rechargeable batteries do in extreme cold temperatures like -40, even if they were receiving a charge in that temperature? They would be kept in an air tight container. Thanks in advance.

Posted by horsebones 7 years ago  |  last reply 7 years ago


Temperature and LEDs

Is there a way to control a group of LEDs or even an RGB LED with some sort of temperature sensor/thermometer? I'm new to electronics and wanted to know if you could have a Red LED glow when something relatively hot/warm was near and have a Blue LED glow when something relatively cold/cool was near by. I'm new to electronics and was just curious

Posted by smkoberg 9 years ago  |  last reply 9 years ago


ntc thermistor for auto rpm pc fans

I have 470 ohm thermistors and i want to auto control my pc fans ie when the temperature is low the fans are off or low speed,when temperature go high the fans rpm follow up.is there a scematic how to do a pcb?

Asked by napoleonis 9 years ago  |  last reply 3 months ago


120v thermostats: need help building or sourcing

I'm planning to build an incubator, and I need something to help regulate the temperature.   I've found some in-line thermostats online, but if I had a parts list, I could easily wire something myself.  Does anyone have any knowledge or experience they can share with me?  Thanks!

Posted by awascholl 5 years ago  |  last reply 5 years ago


Temperature LED lights for motorcycle

Hi I would like to build a temperature sensing leds for my rid to work on my motor cycle to check for black ice!. I want have this circuit as small as possible (fit in a bike light so can mount on handle bars of my motor bike) I have been able to do this via a Arduino board but when I convert this to work on a Attiny85 it will not read the same results. I think this could be due to the way the Attiny85 converts the elec signal. I use a 4.5 volt battery (3 * 1.5) could this be the problem? Here is the code I have used for both the Arduino (which works great) and also the Attiny85 (not working as should) /* temp lights using Uno & LM35 Arduino */ const int tempPin = A0; const int Temperature= 0; // declare the led pins  const int led01 = 9;   const int led02 = 10;   const int led03 = 11;  //declare the variable for the temp int temp=0;//changed to = 0? int AjustTheTemp= 0; //Declare the leds as outputs void setup() {    Serial.begin(9600);      pinMode (led01, OUTPUT);   pinMode (led02, OUTPUT);   pinMode (led03, OUTPUT); }     // Main Program     void loop() {         // read the voltage from the temp sensor     // and change it to celsius     int reading = analogRead(Temperature); float voltage = reading *5; voltage /= 10; float TemperatureC = (voltage - 0.5) ; //show temp in monitor so can make changes        Serial.print("TEMPRATURE = ");   Serial.print(TemperatureC );   Serial.print("*C");   Serial.println();     delay (1000);//delays the print to monitor                // by 1 sec   if (TemperatureC<(1-AjustTheTemp)) {   digitalWrite(led01, HIGH);   digitalWrite(led02, LOW);   digitalWrite(led03, LOW);   } else if(TemperatureC<(4-AjustTheTemp)){   digitalWrite(led01, LOW);   digitalWrite(led02, LOW);   digitalWrite(led03, HIGH);  }    else if(TemperatureC<(10-AjustTheTemp)){   digitalWrite(led01, LOW);   digitalWrite(led02, HIGH);   digitalWrite(led03, LOW);      }      } /* temp lights using Attiny & LM35 */ //const int tempPin = 0; const int Temperature= 3; // declare the led pins (attiny) const int led01 = 2;   const int led02 = 1;   const int led03 = 4;  //declare the variable for the temp int temp=0;//changed to = 0? int AjustTheTemp= 0; //Declare the leds as outputs void setup() { //  Serial.begin(9600);      pinMode (led01, OUTPUT);   pinMode (led02, OUTPUT);   pinMode (led03, OUTPUT);   pinMode (Temperature, INPUT); }     // Main Program     void loop() {         // read the voltage from the temp sensor     // and change it to celsius     // temp = analogRead(Temperature);     // temp = temp * 0.48828125;        int reading = analogRead(Temperature); float voltage = reading *5; voltage /= 10; float TemperatureC = (voltage - 0.5) ; //show temp in monitor so can make changes        // Serial.print("TEMPRATURE = ");   //Serial.print(TemperatureC );   // Serial.print("*C");   // Serial.println();     //delay (1000);//delays the print to monitor                // by 1 sec   if (TemperatureC<(27-AjustTheTemp)) {   digitalWrite(led01, LOW);   digitalWrite(led02, HIGH);   digitalWrite(led03, LOW);   } else if(TemperatureC<(29-AjustTheTemp)){   digitalWrite(led01, LOW);   digitalWrite(led02, LOW);   digitalWrite(led03, HIGH);  }    else if(TemperatureC<(31-AjustTheTemp)){   digitalWrite(led01, LOW);   digitalWrite(led02, HIGH);   digitalWrite(led03, LOW);      }      }

Posted by minimadmalc 4 years ago  |  last reply 4 years ago


How can i recheck my connections?What are the general problems regarding Lcd displays?

I just need to know regarding the buzzer module ...I have been using buzzer instead of  a buzzer module.Is it fine? ..Although it works fine.And please let me know the general troubleshoots related to LCD displays .I think my circuit's working great except for the lcd part. I am done uploading the code.But the LCD doesn't show any temperature values.Please help me

Asked by achyuth93 4 years ago  |  last reply 4 years ago


Clever ways to use ordinary parts to sense temperature? Answered

While designing a flyback driver circuit I figured the best way to cool the transistors in use would be to use the stock intel CPU cooler. They are small, compact, and effective, and the delta fan is of reasonable quality. I would like to control this PWM (4 pin) fan with the 2 extra comparators I have left over from my LM339. What common passive (or active) components have a large enough temp-co to allow their use in sensing tempurature? Or will I just need to buy some specialized ICs purpose designed for this task?

Asked by -max- 2 years ago  |  last reply 2 years ago


Need a designer for a simple down-hole Well survey device project

Greetings, I am looking for design help (paid) for a project I have in mind.  I would like to design a temperature and fluid conductivity (possibly some other parameters, ie pressure) monitoring device for water wells.   The device needs to be small, self powered (battery) and may incorporate data logging capabilities.  I would like the device to use off the shelf  parts like Arduino or some equivalent . The device will need to be designed to fit into a very small water tight and pressure safe housing (60 Atm ~ 800 psi).  I am interested in contracting someone to do the electronic/sensor design and  write any code required, I will design/build the housing to fit.  Look forward to hearing from anyone interested.

Posted by ccorbell 6 years ago


constant power with timed output

Hi all,           So ive found a circuit that i wish to use found here: http://www.maplin.co.uk/module.aspx?TabID=1&criteria;=usb&ModuleNo;=220003&C;=SO&U;=Strat15 its a temperature activated circuit so when it gets to say 30 degrees celcius it switches the relay and makes the connection what i need it to do is when it reaches the designated temp, give a momentary 12v for 2 seconds then do nothing for 1 minute, if it is still at the designated temp after 1 minute give another 12v for 2 seconds then nothing for 1 minute and so on and so on untill the temp drops below the designated temp and the circuit will no longer be live untill it reaches temp again. is there any easy way to modify this circuit or another way to do this thanks

Posted by newbie308 8 years ago  |  last reply 8 years ago


Any way to fix a wacky shower?

Once every few weeks, the shower decides to alternate between hot and cold water. When it starts to spray cold water, the water flow is reduced first, then a few seconds later, it turns cold. It goes back warm a few seconds later. This has happened several times in the past month. Any solutions?

Asked by DJ Radio 9 years ago  |  last reply 8 years ago


Manipulating temperature in garment steamer

 I have a garment steamer. As a school project, I need to do an innovation where I need to add temperature regulator features. I have read that irons use thermostat to control the temperature, how do i install a thermostat in the steamer or is there other ways to regulate the temperature. By the temperature regulator, i should be able to produce the right amount of steam at the right temperature for each fabric.

Posted by WafiqahK 1 year ago


How much temperature do it created by 10w, 20w, 50w laser or laser diod?

I don't know what is laser or laser diod. I want to know about the temperature mainly.

Asked by fairuj 9 months ago



Temperature stabilizer system with peltier battery

Hello everyone! I have a thesis to design a temperature stabilizing(controlling) system for solar cells.I need to use 12V Peltier battery and a simple pc fan.Any further help is appreciated.

Posted by UgurO 3 years ago  |  last reply 3 years ago


I want to build an LCD water temperature display.

I am a complete newbie at electronics so it needs to be simple! I have a solar hot water tank and wish to display temperatures from externally mounted sensors which I will mount on the outside of the tank at various levels. I wish to display the temperatures on a series of 3-digit LCD modules. I would be most grateful for an instructable for this project.

Asked by DRR 9 years ago  |  last reply 9 years ago


temperature controlled switch

I I'm working on a water spray kit for my intercooler on my car and i want the pump to turn on when the air outside is => 50 and the intercooler is like 15-75 > then the air i want both of the them to be adjustable. I i could make it activate when its like >50 the and it activate 30 above that the out side air or something like that could and one help me out the a schematic.

Posted by dragon2144 10 years ago  |  last reply 10 years ago



Does anyone have any idea on how hot an average desktop computer gets?

Or do you know how much electricity a normal computer fan uses in a hour? Thanks.

Asked by Bostonians 9 years ago  |  last reply 9 years ago


How to create an Adiabatic, Isochloric and Isobaric Environment?

I am trying to make an chamber to examine the growth of a micro organism in the above condition. The chamber temp. should be maintained at 95-100 C and. The environment should be tends to vacuum(Vacuum condition is practically impossible). Please help in choosing the material and conditioning the same.

Asked by dashinfoline 7 years ago  |  last reply 6 years ago


vehicle vinyl application

I'm working on a large project with a deadline, and falling temperatures in the Northeast are influencing my work performance. What I need is a portable, efficient, and safe device and/or method that can quickly heat the outside of a car.I am working with temporary adhesive vinyl panels that are being applied to the entire hood and trunk of New York City taxi cabs. We can only apply these panels for about 2 more weeks, and we are trying to cover as many taxis as possible. The weather, however, has been slowing our progress. When the temperature gets to about 60 degrees F and lower, the panels become very brittle, almost like paper, and lose some of their adhesive properties. Application becomes very difficult. We're able to keep the panels in a heated vehicle, which helps a bit. But the outside of the cars, particularly the trunks, are too cold for a proper application. The hood can be easier if the engine has been running for a bit, because this warms the panel and restores its malleability.Does anyone have any suggestions concerning a fast, efficient, portable, and safe method for heating the coachwork of a vehicle? If you can't meet all of the criteria, the device and/or method must at least be portable. But I'm curious to hear any other suggestions, as well. I've come up with a whole slew of ideas that are plenty fast but are in no way safe. Let's face it, though, they're still fun to think about.Any help would be greatly appreciated. I have faith in the creativity of Instructablers! And think of it this way; your help can contribute to a really excellent project. If anyone would like more info, gardenintransit.org. Rock on.

Posted by teej 11 years ago  |  last reply 11 years ago


is it possible to boil water from room temp (20C) using regular batteries?

Hello everyone, is it possible to boil water from room temp (20C) using regular batteries? according to my research, to warm up 500mL of water by 10C within 10 minutes, it will take 1 battery (3.7V 3400mAh). I have a feeling that's wrong but I used this formula and some others: [500 grams * (Tfinal - Tinitial) * 4.186 J/g C ] / [E.battery]

Asked by inventor2014 5 years ago  |  last reply 5 years ago


Small Temperature Controlled Relay Circuit? Answered

I'd like to build a small temperature controlled relay circuit. I need to sense water temperature and send +12vdc if temp is <95F and -12vdc if >104F. It's driving a linear actuator so it should advance the rod (+12v) at low (<95F) temperature, hold position (0v) between 95 and 104, and retract the rod (-12v) at high temperature. (>104F) Any circuit suggestions? Thanks.

Asked by dmcgraw7 9 years ago  |  last reply 9 years ago


Monitor Temperature And Humidity Via Internet

I would like to build a project which can monitor the temperature and humidity in each one of my rooms in our house and at my daughters apartment.  I would like to use a web page to monitor from anywhere.  I know there are sensors which can do both.  Each room has a computer and is connected to the Internet.  So how do I begin?

Posted by SpaetzleKing 2 years ago  |  last reply 2 years ago


ping pong ball temperature sensor

I remember seeing an instructable where they put a temperature sensor in a ping pong ball and when it's cold out it turns blue and when it's warm its red. I've been trying to find it here and on google, but I can't find it anywhere. Has anyone seen it lately?

Posted by ravenhaker 7 years ago


How to control the temperature of a peltier module?

What is the most efficient way of controlling the degree of hotness or coldness of a 12v 6A peltier module? Can I use PWM?

Asked by Jayvis Vineet Gonsalves 4 years ago  |  last reply 4 months ago


How could i wire up 2 servos, a temperature sensor and an arduino? Answered

I want to do this so I can automate the running of my bath, so for example, I can select 2i want 27 degrees" on the arduino then it will open the taps (forcets) and controll them to get the right temperature.

Asked by joearkay 8 years ago  |  last reply 8 years ago


LCD temperature logger

A temperature logging system based on Arduino that outputs to a 5" color LCD.  Accommodate multiple inputs, and display simultaneously in different colors.  User adjustable time span on the LCD, user adjustable temperature ranges.  Would be great for a weather station and other apps.

Posted by LesB 3 years ago  |  last reply 3 years ago


I would like to know how to build a electronic temperature sensor that will sound an alarm at about 50C.

The temperature the alarm sounds at can be  anywhere from 45-65C, I'm not really picky.  Links to any related instructables would also be helpful.  Thanks! 

Asked by liam2317 9 years ago  |  last reply 9 years ago


Temperature Monitoring - Brewing Beer

Hello! I am new to here. I have done a bit of coding in the past, but not really delved too deeply into the hardware side of things.  I am currently brewing beer and would like to make something with a thermostat that I can attach to the outside of a plastic bucket to monitor the brewing beers temperature. The thermostat would need to have a bit of length to it. It would also be amazing to record this data on a computer. Can anyone help me out, and point me in the right direction?  Much appreciated! Thanks, Ged

Posted by GedK 3 years ago  |  last reply 3 years ago


science Question!

While day dreaming in history class, A question popped into my mind; If our body temperature is 98 degrees Fahrenheit (37 degrees Celsius) why are we uncomfortable in hot weather?

Posted by mynameisjonas 10 years ago  |  last reply 10 years ago


Thermocouple calibration - How to

Hello,I have a few questions about the thermocouple calibration.I want to use three type R thermocouples to measure the temperature during a 3d printing process using an Arduino Uno and the max31856 amplifiers. Right now I am doing tests with K type thermocouples before we buy the R-types. It seems to work fine, it measures a room temperature of 22ºC more or less and reacts reasonably in my opinion but I would like to know if the measured temperature is the actual temperature.1. Is a calibration needed? I know the amplifiers (max31856) do some corrections automatically, but maybe an extra calibration is needed.2. If such a calibration was needed, how would I do it? For example, I will put copper in an oven and heat it and measure the temperature with my thermocouples and with a bolometer. If my thermocouples measure something different, how do I correct it? Theoretically my program transforms (via amplifiers) the measured tension difference into temperature, correcting it at the junction. How would I tell it now that it has to measure differently?3. If no calibration is needed and, as I explained in 2, my thermocouples measure something different as the bolometer, which one is the accurate? Thank you very much for your help.

Asked by DiegoH57 10 months ago  |  last reply 10 months ago


Need a small 12v heat source for simulated HVAC project

Okay, so for our year end micro controller project we need to control a temperature inside two 2L pop bottles connnected together. We have a computer fan mounted at the end of the "heating bottle" which needs a heat source in it. The fan will blow the hot air from "heating bottle" into "temperature bottle" which contains an analog temperature sensor. We have to control a set reference temperature point in "temperature bottle" using a PIC16f690 microcontroller by manipulating the fan speed and heat ON/OFF. Problem: I need a decent heating source inside "heating bottle" . Ive been using 12v automotive lightbulbs which work great for a minute or two but then die out. My crappy power supply can only pump out 1 amp, could this be why? Any suggestions on what to use as a heat source? I was thinking some 5w resistors but classmates have said our power supplys cant handle them either. Thanks in advance!

Posted by Korey 10 years ago  |  last reply 10 years ago


I'm melting

I recently got some thin PVC plastic for cheap.  I would like to soften it so I could shape it, but I have no idea what temperature to do it at or what to use to heat it.  I don't want to spend money.   Thanks!

Posted by elliot5445 4 years ago  |  last reply 4 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 8 years ago  |  last reply 8 years ago


hot glue in a dishwasher?? Answered

I am repairing broken locking mechanism in the door of a dishwasher. Of course there will be a bit of force involved when pressing the handle and the dishwasher will heat the water which can melt the glue. What's your opinion? Should i use it??

Asked by Karletto555 8 years ago  |  last reply 8 years ago


Wireless boiler temp &amp; pressure monitor

I know it can be done but not sure if it already has been done.. If not I want to figure out a way to make a wirless network monitor system that can send SMS messages for low temp and/or pressure on a boiler(s). Any tips or diagrams would be appreciated.

Posted by VansDesigns 7 years ago


Heat gun mod question

I am not an electrician but I like to tinker. I am just getting started with DIY type electronics kits and I have decent soldering skills. I cant say I am an expert at reading prints, but I can usually build a simple schmatic. I wish to disassemble a heat gun for parts and add in a potentiometer to vary the heat, another potentiometer to control the airflow, and a digital temperature probe with temp display. I am attempting to build a heat generating device with precise control of the temperature and airflow. I dont really want to spend $150 on a fancy LED digital display heat gun with variable heat dial, so this is my next option and potentially a heck of a lot more fun. Initially I just want to get the variable heat and airflow control(potentiometers) hooked up, and if it will be easy enough I can later install the temp display. I could always just use a cheap "laser" temp probe to check the temp and ensure it is fairly stable. The heat gun I am looking at is a piece of junk and it only has 2 temp settings. How easy is it to install a potentiometer for varying the heat and one for the airflow? I assume I can just install the one for heat control inline after the circuit that sets the maximum heat level and dial in the temp I want. As for the airflow control I assume I could do the same thing, but instead put it before the power lead feeding the fan. I am not an electrical engineer so I want to make sure this will work first before I fry my cheapo $20 heat gun. Would it be bettter to just gut the entire thing and work with the naked parts and install my own circuit to control and display the temp or could I keep the basic unit intact and mod from there? Any ideas, or a basic schematic that would satisfy this requirement would be greatly appreciated.

Posted by RokGoblin 10 years ago  |  last reply 10 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 6 years ago  |  last reply 6 years ago


modify wine cooler thermostat refrigerator thermostat operating temperature

Hello. Can someone please tell me how to modify the thermostat on a wine cooler (that uses a compressor). I want to change the temperature from running between 10c-18c to 0c-5c. Please post an instructable or give me ideas- even if generic, it would be helpful.I am specifically trying to modify a baumatic bw18.

Posted by drosengarten 9 years ago  |  last reply 8 years ago