7 segment 3 digit Temp Display

[ozarkshermit]

Here is a PDF , from Marlin P. Jones, who also sells them

 

[schmitt trigger]

I savaged the jack plug from a meat thermometer. I assumed it is a K-type and I got an amplifier for it.

Thermocouples wiring colors are standardized, for the K type it is yellow-red.
Also, since the metals in the wire are not copper, but chromel/alumel pairs, the wire is significantly stiffer than copper.

 

[Matienzo]

UPDATE: Yeap, it was a thermistor not a thermocouple. I can pick up the change in resistance with arduino but thank you for all the thermocouple suggestions (ans sorry for the confusion)

Have you considered one of these ? I ordered one for a little over $3.00 from ebay

do a google search for:

W1209 Digital thermostat Temperature Control Switch 12V sensor Module -50-110°C

Lots on ebay, even on Amazon

I'll definitely consider it for future projects, it looks really useful.

As far as my original question, The 7 segment 4 pin I ordered works really well.

Thank you all for your help. I always learn something useful here.