Digital Thermometer / Thermostat

[impeter]

I was wondering if anyone had the circuitry to build a digital thermometer with an LED readout. Your help would be much appreciated!

 

[kinjalgp]

Use Dallas DS1821, digital 1-wire thermostat temperature sensor along with PIC or any other microcontroller. DS1821 is a good sensor with +-0.5 degree celcius resolution.
Here you can find some source and schematic of DS1821
https://www.microchipc.com/sourcecode/#ds1821

Here is a schematic for DS1820 which is only temp. sensor (no thermostat). But you can implement your own thermostat in firmware.
https://www.anotherurl.com/therm/schematic.htm

Couple more schematics.....
**broken link removed**
**broken link removed**

 

[impeter]

Thankyou

Thanks alot for that. We'll see how it goes.

Just one question,
Where do you obtain your circuit designs from or do you basically make them up as you go?

 

[Phasor]

Where do you obtain your circuit designs from or do you basically make them up as you go?

A bit of both, really. Often I take snippets of schematics, and put them together (like Java Beans, if you're into programming). There are also a lot of circuit encyclopaedias available at most libraries, and quite a few good circuit sites on the web.

As for the LED readout for your thermometer - have a look at the LM3914 - it seems to be popular lately It's an LED bargraph driver.