Oven Temperature Checker

Measuring temperature using a MAX31855K thermocouple to digital converter chip and Lilygo TTGO T-Display ESP32 board. To be used as an "Oven Temperature Checker" ( OTC ) for comparing actual air temperature inside a domestic oven with the set value.

Type-K thermocouple connected to MAX31855 breakout board

The OTC is unusual as it also acts as a BluetoothⓇ server ( SpacerLabs_OvenCheck ) using the 'Bluetooth Low Energy'  ( BLE ) variant of BluetoothⓇ. Connecting to it with a paired BluetoothⓇ client device ( e.g., a smart phone 📱), having a suitable App installed enables the OTC ready for use. The BLE features of the OTC have been modelled on the standard service and characteristics of the BluetoothⓇ "Environmental Sensing Service", having just the one characteristic for "Temperature" exposed.

SpacerLabs "Oven_Check" App

Many general purpose BLE client App's are available. However, here at SpacerLabs, we have built our own custom App for Android devices, called 'Oven_Check', to make the process of accessing the functions of the OTC quick and easy.