Water Level Sensor MILONE eTape – RAKwireless RAK12059

The RAKwireless RAK12059 is a WisBlock module designed for liquid level measurement using a MILONE eTape level sensor. The eTape is a solid-state sensor with a resistive output that changes with fluid level—eliminating bulky mechanical floats and making integration into electronic control systems straightforward.

The sensing behavior is explicitly defined: the sensor’s resistance is inversely proportional to the liquid height—lower level = higher resistance, higher level = lower resistance. The RAK12059 module connects to the eTape sensor and provides the liquid level signal via an I2C interface, simplifying integration with microcontrollers and IoT endpoints.

The module supports three eTape active sensor lengths:

213 mm (8.4″) – 12110215TC-8TJ

315 mm (12.4″) – 12110215TC-12TJ

618 mm (24.34″) – 12110215TC-24TJ

It operates from a 3.3 V supply, and the stated eTape operating temperature range is -9 °C to +65 °C. The text also mentions a software library and tutorial to speed up evaluation. It mounts into the sensor slot on a WisBlock Base board and requires a WisBlock Base plus a WisBlock Core module.

Practical use cases include:

Water storage tanks: level monitoring, refill alerts, leak-related logic

Hydroponics and irrigation: reservoir monitoring and pump control triggers

Aquariums and fountains: level monitoring and dry-run protection for pumps

Pool controllers: tank/buffer monitoring (system dependent)