Temp controller

I need to activate a garage door opener  with temp control. Opener uses momentary switches   There is a solarium on the out side of my shop garage door, When the temp between the door and the solarium reaches +/- 90 degrees  the door would open and +/-60 degrees the door would shut. Because the opener needs momentary contacts a regular thermostat  will not work. Any ideas would be greatly appreciated..

Topic by mcsxr2 6 years ago  |  last reply 6 years ago


TEMP HELP!!!! Answered

Do i set the temp at 210degF (boiling point 212degF) or adjust temp to 173degF? I know 173 & 212degF points on my stove from previoius runs.  How cold does the temp of the condenser need to be? 

Question by witherspoon520 9 years ago  |  last reply 9 years ago


temp controller

Hi dont know is anybody can help replacing the batteris in my drill pack and found that it has what looks like a thermistior??? to control chaging temp.  unfortunatly when dismantling I shorted it out to + and i believe blew it. i need to renew it as it lookslike it feeds relay in charger to switch  when fully charged (its a 1 hour fast charge)  how ever dont know what it is . it appear tobe connected in series with a resistor ???(again not sure can up load a photo if it helps) the thermistor is 2 wire and marked M20 tp118/c 02c if that helps, the resistor 05u-045G peter

Question by peter354 7 years ago  |  last reply 7 years ago


Turkey Temp Help

I roasted a turkey to safe temps and turned the cooker off 10pm, Fell asleep then came back at 4am temp was at 140-150. Is it safe?

Question by landsmob7 7 years ago  |  last reply 7 years ago


Adj. Temp Sensor

I am looking for a 12V adjustable tempurature sensor that will provide a trigger output when the temp exceeds the setting. Can anyone help ?

Topic by daveyandgolie 11 years ago  |  last reply 11 years ago


How to build a smoker temp control system like the bbq guru and such?

I would like to build something to keep my wood fired smoker at a constant temp by a forced air fan and dont want to spend 300 for a guru1

Question by 9 years ago  |  last reply 3 years ago


Can't UNPUBLISH

I unpublished my instructable https://www.instructables.com/id/DIY-natural-gas-generator-convertir-de-nafta-a-ga/ but it remains in the page. I went to RECENT and go back thru Jan 29, and still there it is. What can I do? I want to remove it, at least temporarily, meanwhile I can not to operate under load the generator.

Topic by rimar2000 6 years ago  |  last reply 6 years ago


How to show 3 different temperatures using 3 LEDs connected to a ATtiny85?

Hi people I am trying to build a temperature sensor using 3 LEDs. The aim is to have them come on at specific temperatures. This is for my motorcycle ride to work this coming winter. I want to know when the temp goes below 8c down to 5c from 5c down to 0c then below. I have managed to do this via a arduino board & a LM35 sensor and 3 LEDs. But I cant get this to work on the ATtiny85 chip. Below is the code I wrote for this on the arduino. Any help or different program would be of great. *my first attempt at a temp warning light need it to come on when temp lower than 5deg celsius */ int tempPin = A1; int led01 = 8; int led02 = 9; int led03 = 10; int tempMax = 28; int tempMid = 27; int tempMin = 5; int temp; void setup() {   Serial.begin(9600);     pinMode (led01, OUTPUT);   pinMode (led02, OUTPUT);   pinMode (led03, OUTPUT);   pinMode (tempPin, INPUT); }     void loop() {      temp = analogRead(tempPin);      temp = temp * 0.48828125;     Serial.print("TEMPRATURE = ");   Serial.print(temp);   Serial.print("*C");   Serial.println();   delay(1000);   if (temp > tempMax){   digitalWrite(led01, HIGH);   digitalWrite(led02, LOW);   digitalWrite(led02, LOW);   } if (temp < tempMid){   digitalWrite(led01, LOW);   digitalWrite(led02, HIGH);   digitalWrite(led02, LOW);   } if (temp < tempMin){   digitalWrite(led01, LOW);   digitalWrite(led02, LOW);   digitalWrite(led02, LOW); }}

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


Raspberry Pi PC temp checker

Hello forum, I'm planning on buying a raspberry Pi this week. I know a couple programming languages, but only the basics. I've had this idea for quite a while: Connect multiple thermal sensors to the Pi, and then connect the Pi to my old Android cellphone (Nexus 2), and mount the phone to my PC case, so I get read outs for the PC components (CPU, VGA, PSU, HDD, and so on). Can someone help me, and explain how I can do this? I see it as a fun hobby to get into programming, and also reuse a cell phone, so I don't throw it away.

Topic by GeorgeK31 3 years ago  |  last reply 3 years ago


temperature gauge ?

Where  can I get a replacement spring type outdoor temperature gauge?

Question by ssivels 2 years ago  |  last reply 2 years ago


What is instructables page/ picture limit? Answered

I had trouble uploading a lot of photos and was wondering if there is a picture limit? Is there a page limit for instructables? Why doesn't spell check work when I hit spell check?  Thanks in advance.

Question by sunshiine 8 years ago  |  last reply 8 years ago


Is there any solid that melts at a lower temp?

 Matter can change states. Most solids need an increase in temperature to melt. Is there a solid that can melt at a lower temperature.

Question by joyce kane 9 years ago  |  last reply 9 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.

Topic by VansDesigns 7 years ago


Stopper thermowell for DS18B20 temp sensors?

Does anyone know of a thermowell stopper that would fit a DS18B20 temp sensor? The ones I've come across look to have an inner diameter of .25 inch, and the DS18B20 probe diameter says .24 inch. Are there any other thermwell stoppers out there with a wider inner diameter? I'd like to go with a thermowell stopper so I can use it on buckets and maybe carboys as well.

Question by DELETED_MakiY2 1 year ago  |  last reply 1 year ago


Is there a good glue that is not effected by cold temps?

The stone attached to one of my husbands tie tacks came off--it was glued on.  I think the reason it came off is that he was out in the cold a lot that day.  Does this sound reasonable?  Is there a glue out there somewhere that is not effected by temperatures? Thanks in advance!

Question by gemjunkie 8 years ago  |  last reply 6 months 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.

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


Temporary Log Off?

Hello, It seems that every time I try to view this (and ONLY this) instructable, my account is temporarily logged off, leaving me unable to comment, rate, or even favorite the post. (and it's a great share too, just what I was looking for!) I've notified the author of this as well, who also seems to be having trouble with their image tags. Could anybody please look into this? I'd hate for such a useful post to die in obscurity. Thank you... -rhoddity [link] https://www.instructables.com/id/Custom-Switch-Panel-for-a-Flight-Simulator/

Topic by rhoddity 8 years ago  |  last reply 8 years ago


I need an arduino temperature and humidity sensor WITHOUT Wifly

Hi all, I am looking to make an arduino temperature and humidity sensor with an onboard display. I am fairly new to arduino but do have electronics experience. I am looking to just look at the thing and be able to read the temperature and humidity without having to go into the other room and kick someone off of the computer. I currently have an arduino uno, a RHT03 Humidity and Temperature Sensor, several 7 segment displays, enough LEDs to make a led matrix or clock type setup, and a Nokia 5110 graphic LCD with arduino board (which I could remove if needed) found at https://www.sparkfun.com/products/10773  Any help would be greatly appreciated. Thank you all. Professorred

Topic by professorred 6 years ago  |  last reply 6 years ago


Is there any free software to tell me the temperature of my laptop?

So my brother sold me his old broken laptop for $7 in quarters! (What a steal right?) So I scrapped the speakers, 2 sticks of RAM, USB ports, a cooling fan, LCD screen, a hard drive, and a diode. So I took the fan and wired it to a USB cable to have a cooling fan under my laptop since it usually runs pretty hot, and now it's nice and cool. Is there a widget or free software to tell me the temperature? Thanks. PS: What else should I do with all these parts? I already installed a RAM chip in my computer.

Topic by Zachintosh 7 years ago  |  last reply 7 years ago


How does heating of nichrome wire work? Answered

I was thinking about a situation, but right now I've hit a dead end; Ok, picture this: There's a room with a length of nichrome wire which connects to a power supply. (The power supply is constant voltage, and the length of nichrome wire will be constant throughout these scenarios) If the room is at room temperature, and power is applied to the wire, it heats up to x degrees after 1 minute. Here's what I wanted to know: If the room was below room temperature, and power was applied, would it still heat up to x degrees after 1 minute? If the room was at x degrees, what temperature would the wire get to (i.e, would it be higher or lower than the very first scenario) when power is supplied, after 1 minute? Thanks in advance

Question by .Unknown. 7 years ago  |  last reply 7 years ago


what is the max temp of the waste oil furnace?

Question by lemra4 10 years ago  |  last reply 10 years ago


How to get colder temp from Beertender

Does anyone Know How I can Hack the T-Fal Beertender which uses Heineken and Newcastle Brown ale mini kegs. I would like to get the temp lower than the 39 degrees that the factory set it at.

Topic by TheCritic 7 years ago  |  last reply 6 years ago


brainstorming a controlled temp kiln for polymer clays?

I am making some highly  detailed prototypes, and Im using polymer clay for the details. I've been baking them in my kitchen oven, but it's starting to get hot with summer coming on... I want to limit the heat production in my house! I have an old toaster oven, but it's too small for my items. I was thinking of taking it apart, and using the heating elements and temp controls in something a little bit larger. I'm wondering what the community thinks about that? My temperature needs to be 275° for fifteen minutes at a time. Some temp fluctuation is okay. I'm thinking 14 inches cubed would be plenty of room for my largest pieces.  somewhere I noticed someone using cement board as an insulating wall, I was thinking a cube made of that with a hinged side. Does anyone have other ideas for me? TTY

Question by probablepossible 6 years ago  |  last reply 6 years ago


Observing &quot;weather&quot; (stratospheric temp.) with cosmic rays

An article in New Scientist reports on an analysis of cosmic ray muon data from the MINOS underground detector, which correlates with "sudden" (24-hour timescale) temperature changes in the stratosphere. The original article in Geophysical Research Letters gives you a good flavor for how this kind of analysis is actually done, and written up for publication. The figure below (Figure 3 of the article) shows the beautiful correlation between the temperature (5-day running average in blue) as measured by sounding balloons, and the muon rate in MINOS (also 5-day running average, red band with uncertainties). The alignment of the two curves is obviously not known a priori. The exact numerical calibration between muon counts (red, right scale) and temperature (blue, left scale) is a fitted output of the analysis, not an input.To me, it's just kind of neat that particle physics can relate so sharply to some "real world" large-scale properties.

Topic by kelseymh 10 years ago  |  last reply 10 years ago


wemos d1 mini blynk? display temperature&humidity?

this is my code and it works to display c&% on display and blynk app and it notifies me when it starts and run time, is there a way to display runtime/uptime on the display and should i remove anything? maybe add in code to send email when offline for more than 5 minutes? why does the screen go black when it updates? what other data can i display on the screen? it will be used to monitor server room temperature, thanks #include #include #include #include "Adafruit_SSD1306.h" #include #include #include #define OLED_RESET 0  // GPIO0 Adafruit_SSD1306 display(OLED_RESET); #define BLYNK_PRINT Serial #define DHTPIN D4 #define DHTTYPE DHT22  DHT dht(DHTPIN, DHTTYPE); // You should get Auth Token in the Blynk App. // Go to the Project Settings (nut icon). char auth[] = ""; // Your WiFi credentials. // Set password to "" for open networks. char ssid[] = ""; char pass[] = ""; BlynkTimer timer; void notifyUptime() {   long uptime = millis() / 60000L;   // Actually send the message.   // Note:   //   We allow 1 notification per 15 seconds for now.   Blynk.notify(String("Running for ") + uptime + " minutes."); } void sendSensor() {   float h = dht.readHumidity();   float t = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit   if (isnan(h) || isnan(t)) {     Serial.println("where is my DHT sensor!");     return;   }   // You can send any value at any time.   // Please don't send more that 10 values per second.   Blynk.virtualWrite(V5, h);   Blynk.virtualWrite(V6, t); } void setup() {   // Debug console   Serial.begin(9600);   Blynk.begin(auth, ssid, pass);   // You can also specify server:   //Blynk.begin(auth, ssid, pass, "blynk-cloud.com", 8442);   //Blynk.begin(auth, ssid, pass, IPAddress(192,168,1,100), 8442);   dht.begin();   // Notify immediately on startup   Blynk.notify("Device started");   // Setup a function to be called every minute   timer.setInterval(60000L, notifyUptime);     // Setup a function to be called every second   timer.setInterval(1000L, sendSensor); } void loop() {   Blynk.run();   timer.run();   Serial.begin(115200);   dht.begin();   // by default, we'll generate the high voltage from the 3.3v line internally! (neat!)   display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // initialize with the I2C addr 0x3C (for the 64x48)   display.display();   delay(5000);   // Efface l'écran et positionne le curseur dans le coin supérieur gauche - clear display and set cursor on the top left corner   display.clearDisplay();   display.setTextSize(2);   display.setTextColor(WHITE);   display.setCursor(0,0);   float h = dht.readHumidity();   float t = dht.readTemperature();   float f = dht.readTemperature(true);   float bat = ESP.getVcc();// / 1024;   // Check if any reads failed and exit early (to try again).   if (isnan(h) || isnan(t) || isnan(f)) {     Serial.println("where is DHT sensor!");     return;   }     // Température en Celcius - Temperature in Celcius // display.println("Temp.");   display.print(t);   display.println(" c");   // Humidité en % - Humidity in % // display.println("Humidity"); //display.setTextSize(1);   display.print(h);   display.print(" %");   display.display(); }

Question by turbiny 1 year ago


i wanna use thermoelectric material for temp to electricity conversion ?

Input  temp 200 deg celcius for glowing LED`s how many such materials should i use?

Question by shiblinomani 6 years ago  |  last reply 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. 

Question by Mileman2010 7 years ago  |  last reply 7 years ago


Which is the most popular high temp glue gun?

I want to start building cosplay costumes with EVA foam panels. As far as I can see, people tend to use high temp glue guns for this purpose, but dang if I can't find any posts that can clue me in to which specific gun and glue to use. There are many different guns and glue out there!  Thanks! mowgli out

Topic by boymowgli 4 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.

Question by tig5 6 years ago  |  last reply 6 years ago


where to find temp sensor for 18 volt batteries? Answered

I  work  for a  company that  has  a large  amount  of   cordless drills  adn saw alls  and power  tools. I  have been ask to   see what  it takes to repair the    battery  packs .  I have  a few  questions  i would like to ask if  someone  can help me with  ? 1.  Where  can   one  find  the  temp  sensor  switches   that are  on  the    milwauki red lithium  and   dewalt  18 volt  nicad  battery  packs. 2. does anyone  have  a better way  of    building them other than  soder  each  battery.? I found  a battery spot   welder  but it is  like  $5,000 bucks.  Take  a long time   to pay  for that.   I  soder  my  rc  battery  packs   but  just looking for a better  more cost effective way. Thnaks for any help anyone  can  give. Andy

Question by andy1917 6 years ago  |  last reply 6 years ago


Controlling peltier module temperature base on CPU temps?

Can i use PWM on the motherboard or do i have to buy a separate controller? I plan to use it on a high TDP CPU like the Xen E5 1650v4.

Question by PhuckhangN 9 months 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!

Topic by Kindlekat 8 years ago  |  last reply 8 years ago


Recomendations for newbie kit to control computer temp, fans

Hello all, thank you in advance I would like to make a device that has an lcd readout, and to which informtion can be sent regarding temperature and fan speeds. This would go into my computer. I have a decent amount of experience working with computers, but have no experience with programming or microcontrollers. i am, however, very eager to learn!! Any help is appreciated!

Topic by ridestp 12 years ago


Arduino Run at the same time?

Hi ,  i got problem with my code which is can't run at the same time. for the Heat is great but the ultrasonic didn't trigger the buzzer which is more than 30cm away. btw here is my code , which part should i change ? Thanks #include #define trigPin 6    //trigPin #define echoPin 7    //echoPin LiquidCrystal lcd(12,11,5,4,3,2); int tempPin = A1;   // the output pin of LM35 int fan = 10;       // the pin where fan is int led = 9;        // led pin int temp; int tempMin = 35;   // the temperature to start the fan int tempMax = 70;   // the maximum temperature when fan is at 100% int fanSpeed; int fanLCD; int duration, distance; int buzzer = LOW; void setup() {   Serial.begin (9600);        //Baud rate   pinMode (trigPin, OUTPUT);  //trig pin as output   pinMode (echoPin, INPUT);   //echo pin as input   pinMode (13, OUTPUT);       //Buzzer pin as output   pinMode(fan, OUTPUT);   pinMode(led, OUTPUT);   pinMode(tempPin, INPUT);   lcd.begin(16,2);   } void ultrasonic() {   digitalWrite (trigPin, HIGH);   delayMicroseconds (1000);   digitalWrite (trigPin, LOW);   duration = pulseIn (echoPin, HIGH);   distance = (duration/2) / 29.1;   if (distance > 30)   {     Serial.print(distance);     Serial.println(" cm");     digitalWrite (13, HIGH);   }   else   {     Serial.println (distance);     Serial.println ( "cm");     digitalWrite (13, LOW);   } } void heat() {   temp = readTemp();     // get the temperature   if(temp < tempMin) {   // if temp is lower than minimum temp     fanSpeed = 0;      // fan is not spinning     digitalWrite(fan, LOW);         }   if((temp >= tempMin) && (temp <= tempMax)) {  // if temperature is higher than minimum temp     fanSpeed = map(temp, tempMin, tempMax, 32, 255); // the actual speed of fan     fanLCD = map(temp, tempMin, tempMax, 0, 100);  // speed of fan to display on LCD     analogWrite(fan, fanSpeed);  // spin the fan at the fanSpeed speed   }   if(temp > tempMax) {        // if temp is higher than tempMax     digitalWrite(led, HIGH);  // turn on led   }   else {                    // else turn of led     digitalWrite(led, LOW);   }   lcd.print("TEMP: ");   lcd.print(temp);      // display the temperature   lcd.print("C ");   lcd.setCursor(0,1);   // move cursor to next line   lcd.print("FANS: ");   lcd.print(fanLCD);    // display the fan speed   lcd.print("%");   delay(200);   lcd.clear();   } float readTemp() {  // get the temperature and convert it to celsius   temp = analogRead(tempPin);   return temp * 0.48828125; } void loop() {    ultrasonic();   heat(); }

Question by Melromeo 5 years ago  |  last reply 5 years ago


Newbie here i have a cr-10 and when i set the bed temp n nozzle temp and go back to the main screen it will show the temp i but but then it goes back to 200 on nozzle n 60 on the bed I think something is wrong any ideas anyone

I have printed a few things and they turned out ok..just wandering if their is something wrong with it cuz sometimes it takes forever to start printing and the temp is all over the place

Question by Philveo 9 months ago


Arduino | Run 2 Function at the same time.

Hi , i wanna ask about 2 function which is Ultrasonic and Heat that run at the same time  , For me , i just got Heat running as i want but the Ultrasonic doesn't trigger the buzzer if object (Laptop) 30cm away from the ultrasonic. I've been trying since last week but the result is still the same ;'( Btw here is the code , i've seperate it to 2 function which is Ultrasonic and Heat.  i hope u guys can guide me which part should i change or Add. Thanks in advance ;) //*********************************** #include #define trigPin 6    //trigPin #define echoPin 7    //echoPin LiquidCrystal lcd(12,11,5,4,3,2); int tempPin = A1;   // the output pin of LM35 int fan = 10;       // the pin where fan is int led = 9;        // led pin int temp; int tempMin = 35;   // the temperature to start the fan int tempMax = 70;   // the maximum temperature when fan is at 100% int fanSpeed; int fanLCD; int duration, distance; int buzzer = LOW; void setup() {   Serial.begin (9600);        //Baud rate   pinMode (trigPin, OUTPUT);  //trig pin as output   pinMode (echoPin, INPUT);   //echo pin as input   pinMode (13, OUTPUT);       //Buzzer pin as output   pinMode(fan, OUTPUT);   pinMode(led, OUTPUT);   pinMode(tempPin, INPUT);   lcd.begin(16,2);   } void ultrasonic() {   digitalWrite (trigPin, HIGH);   delayMicroseconds (1000);   digitalWrite (trigPin, LOW);   duration = pulseIn (echoPin, HIGH);   distance = (duration/2) / 29.1;   if (distance > 30)   {     Serial.print(distance);     Serial.println(" cm");     digitalWrite (13, HIGH);   }   else   {     Serial.println (distance);     Serial.println ( "cm");     digitalWrite (13, LOW);   } } void heat() {   temp = readTemp();     // get the temperature   if(temp < tempMin) {   // if temp is lower than minimum temp     fanSpeed = 0;      // fan is not spinning     digitalWrite(fan, LOW);         }   if((temp >= tempMin) && (temp <= tempMax)) {  // if temperature is higher than minimum temp     fanSpeed = map(temp, tempMin, tempMax, 32, 255); // the actual speed of fan     fanLCD = map(temp, tempMin, tempMax, 0, 100);  // speed of fan to display on LCD     analogWrite(fan, fanSpeed);  // spin the fan at the fanSpeed speed   }   if(temp > tempMax) {        // if temp is higher than tempMax     digitalWrite(led, HIGH);  // turn on led   }   else {                    // else turn of led     digitalWrite(led, LOW);   }   lcd.print("TEMP: ");   lcd.print(temp);      // display the temperature   lcd.print("C ");   lcd.setCursor(0,1);   // move cursor to next line   lcd.print("FANS: ");   lcd.print(fanLCD);    // display the fan speed   lcd.print("%");   delay(200);   lcd.clear();   } float readTemp() {  // get the temperature and convert it to celsius   temp = analogRead(tempPin);   return temp * 0.48828125; } void loop() {    ultrasonic();   heat(); } //***********************************

Topic by Melromeo 5 years ago  |  last reply 2 years ago


Arduino can control the temp, humidity, light, CO2 into my greenhouse?

Hello, can anyone tell me if Arduino can control in a greenhouse these parameters? - temperature - humidity - CO2 - light ..? I need for a temp, humidity rate, CO2 rate and so on the Arduino activates different tools in my greenhouse. Thanks!

Topic by NeroInferno 9 years ago  |  last reply 7 years ago


I want to build a digital temp guage one that can go to 450f and another that can read to 1300f.?

Picture is of comercial version. I just need an on switch and a readout

Question by oakironworker 10 years ago  |  last reply 10 years ago


Check CPU temp, fan speed, etc. with a batch file?

I want to check some things like my CPU temperature, fan speed, and other things like that. However, I can't install programs like CPU-Z, or SpeedFan(Don't ask why, I just can't). I've heard of some people doing it through a batch file. Can someone please tell me how?

Topic by metrogdor22 8 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

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


Electric Average: How do you compensate an electric bill from a previous bill when factoring in a difference in av temps

I understand the averages using billed days, total kWh, and the average kWh per day.  But, how would I account for different average temps?  I put in LEDs this fall and want to see if there has been a difference in usage.  our av. Temp this Feb was 29 degrees; last year it was 34.

Question by cgmox3410 6 years ago  |  last reply 6 years ago


Reset password not working

I recently received a temp password for my account, and now that I am logged in and trying to change it to a new one of my own, I am running into a problem. When I enter the temp pass in the 'old password' window one, I get an error message saying "wrong password" I know the temp passes are often limited in functionality to a short time window, so am hoping for a rapid reply & help on this problem.  Mary

Topic by MaryLenehan 6 years ago  |  last reply 1 year 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]

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


How do I integrate a PID temp controller into a microcontroller system?

I understand that most PID temp controllers have some sort of interface to change the set-point via buttons or similar controls but I want to control my set-point using a microcontroller(picaxe). I'm not looking to build or program PID control into my system I'm really only looking to integrate an existing system. any tips on how I might be able to achieve this?

Question by danjamesardoin 3 years ago  |  last reply 3 years ago


I want a home cooling system effective for Temp. upto 46 centigrade.

I am in need of an effective and simple home cooling system to stand with outside temperature upto 45-47 degree centigrade. How an evaporative cooler can be made more effective. my email is vivekgade3@gmail.com

Question by vivekgade 10 years ago  |  last reply 10 years ago


Wireless temperature sensor

Hi I am looking to start playing around with some solar projects. I am looking for a wireless temp sensor or sendor that can work with my Mac or something with a base station that logs temps. Something accurate, versitile  not too expensive would be great Thanks

Topic by xkravx 7 years ago  |  last reply 7 years ago


I am trying to automate a hydroponics system with many sensors and realys. Has any one done this before?

Sensors: Air Temp Water Temp Humidity Air Flow Light Levels Water Depth Ph Levels Co2 Levels in the Air Co2 Levels in the water Oxygen Levels Air Oxygen Levels Water

Question by ckirchner001 6 years ago  |  last reply 6 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);      }      }

Topic by minimadmalc 4 years ago  |  last reply 4 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 :)

Question by tig5 7 years ago  |  last reply 7 years ago