Temperature Sensor Heater with Solid State Relay

January 17th, 2010
patrickikis asked:


A temperature sensor circuit calibrated to activate and deactivate a Schmitt trigger at 18-22 degrees; triggering the solid state relay at high logic, that is connected to a portable heater. And yeah, I was hung over, and I look awful…

18 Responses to “Temperature Sensor Heater with Solid State Relay”

  1. PeaceAndJustice357 Says:

    That’s nice

  2. thebigdash Says:

    This is awsome! What did you use for your tepature sensor?

  3. davidvro Says:

    I’ve done that for my cooler with a High Precision Humidity Sensor SHT15 and a Netburner (freescale) MCU

  4. patrickikis Says:

    No programming required. Calibration is a better word for it. There’s a little math involved, but yeah. My only concern would be that most fire alarms do not detect heat, but smoke.

  5. firealarmfreak Says:

    so could i use a tempeature sensor to make a homemade heat detector for my homemade fire alarm panel? and program it so when the temperature gets to a certain temp, it activates my circuit?

  6. CaaBal Says:

    NEEEEEEEEEEEEEEEEEERDS!!!!

  7. vish12 Says:

    ohh nnoo crap i dont think ive decoupled it ..is that by using a capacitor to store charge or something because ive not studyied decoupling a circuit before thats why. and no i dont think ive got a shorting problem

  8. patrickikis Says:

    If you can be more specific as to how you’ve set up your circuit, maybe I can help. You’re getting intermittent results. Perhaps it is a decoupling error. Have you decoupled your circuit properly? Is anything shorting?

  9. vish12 Says:

    dude u know ur circuit did u use a 741 opamp and if u did how did u connet it up coz myn switches only wehen it wants to .i.e if i put ice on the thermostat it triggers my 555 timer only sometimes :S i dunno whts wrong with it….plz could you tell me how u connected yours…thanks :D

  10. Da0m4r Says:

    this stuff is a life saver…dude can u please send me the circuit diagram :D

  11. thatstrangerman Says:

    you could really sell that you know? an automatic cold-sensing heater? that’d be great anywhere.

  12. patrickikis Says:

    Dude, you are my hero.
    We had the option of specializing in analog or digital electronics. I am a hardware kind of guy, which sucks because ass we do is program in assembly code. It really sucks!
    Most of my newer videos will suround programming. I’ve got a CPLD programming video, and some C programming to mess with the parallel port of my computer.
    Thanks for commenting.

  13. Jimmypage512 Says:

    lol funny dude..

    what was that writting on your hand lol

    Yeah I keep a portfolio of my circuits too.. trust me though.. employers dont give a crap about them.. hardware jobs are no where these days. all software.. sigh i hate software ..

  14. patrickikis Says:

    Naw, there is no need for any monostable or astable operations in this circuit. No need for a clock.

  15. vish12 Says:

    cheers for the reply..soz if u couldn’t understand my question my bad…but i got my answer :D … one thing though did u se a 555 timer in this circuit coz it looks like u have?

  16. patrickikis Says:

    ??? I use 555 timers every day. I wouldn’t implement a 555 timer in this circuit for either astable or momostable operations. If you are suggesting using the output of a 555 timer to trigger the solid state relay, it can be done with ease. I don’t really understand your question. Yes, it is NTC.

  17. vish12 Says:

    and also have u used a 555 timer as a trigger?
    and if you have is it monostable?

  18. vish12 Says:

    i am making a similar system for my electronics project…is your thermistor a ntc type?

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