This is a tutorial how to make a simple Arduino based device which could read temperatures from Thermocouple and translate them to the app over BLE (Bluetooth Low Energy) technology.
I made this tutorial presuming you have some experience with Arduino and know how to work with micro-controllers. Once I have more time I will update this tutorial adding more details and images to make it easy understand for beginners as well. But until then I hope somebody will share own experience with others to help them.
Disclaimer. This tutorial is for your guidance only and I am not taking any responsibility. Proceed further only if you know what are you doing. If you don’t know how to do that please ask other for help or wait until pre-programed ESP32 boards or ready to use devices will be available.
Alternatively you can send me your requests and I will try to make device for you.
You can get MAX6675 and Thermocouple cheaper if you buy them together as a bundle.
Connecting ESP32 board
Connecting MAX 6675
Flashing code to ESP32 board