This will show how to make a Bluetooth Low Energy Internet of Things device to monitor the Electrical Conductivity for hydroponics.

Visit for the full build instructions.


It will walk you through creating the connections to the ESP32 and the uFire EC-Salinity board.


The ESP32 provides Bluetooth Low Energy wireless interface. The uFire device and probe will measure the conductivity of your water sample.


And finally, there is a simple example of how to connect to the BLE interface through your Chrome browser to display the information.