“A multi-channel wireless (2.4GHz) voltmeter display using ATTINY402, Arduino nano, NRF24L01+ and 128x32 I2C OLED.
The transmitter is optimised for low power and will run from a battery for weeks or months depending on usage, sample frequency and of course battery capacity.
Range is a few meters to tens of meters depending on how well the radio module is isolated from the controller, and the RF power setting.
I did the project as an exercise in minimalism.
Developed on Arduino”