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…
January 20th, 2010 at 3:37 am
That’s nice
January 21st, 2010 at 1:42 am
This is awsome! What did you use for your tepature sensor?
January 22nd, 2010 at 6:16 pm
I’ve done that for my cooler with a High Precision Humidity Sensor SHT15 and a Netburner (freescale) MCU
January 25th, 2010 at 6:48 pm
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.
January 27th, 2010 at 7:49 pm
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?
January 28th, 2010 at 8:08 am
NEEEEEEEEEEEEEEEEEERDS!!!!
January 30th, 2010 at 7:18 pm
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
January 30th, 2010 at 10:31 pm
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?
February 2nd, 2010 at 5:04 am
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
February 3rd, 2010 at 9:41 am
this stuff is a life saver…dude can u please send me the circuit diagram
February 4th, 2010 at 12:37 pm
you could really sell that you know? an automatic cold-sensing heater? that’d be great anywhere.
February 6th, 2010 at 3:05 am
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.
February 6th, 2010 at 4:52 am
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 ..
February 9th, 2010 at 2:28 pm
Naw, there is no need for any monostable or astable operations in this circuit. No need for a clock.
February 12th, 2010 at 8:23 am
cheers for the reply..soz if u couldn’t understand my question my bad…but i got my answer
… one thing though did u se a 555 timer in this circuit coz it looks like u have?
February 15th, 2010 at 3:16 pm
??? 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.
February 16th, 2010 at 2:03 pm
and also have u used a 555 timer as a trigger?
and if you have is it monostable?
February 19th, 2010 at 6:11 am
i am making a similar system for my electronics project…is your thermistor a ntc type?