The ESP8266 and its heavyweight sibling the ESP32 are fantastic boards ... as well as a BMP280 sensor to read ambient temperature and atmospheric pressure. There’s also an SD card reader for ...

the ESP32 needs to find the sensor, connect to it, select the right service, and listen for the notifications containing the data. The data is then converted to RPM and displayed on a small OLED ...

As Hackaday revealed, this one comes with an E Ink display, a secondary OLED panel, and a keypad made ... The device comes powered by an ESP32-S3 processor and supports Wi-Fi 4 and Bluetooth ...