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Take an Arduino compatible 3.3V sensor and turn it into a long distance robust industrial sensor.
The 4-20mA.ker is a universal Arduino derived 4-20mA sensor transmitter. It allows you to install 3.3V sensors in remote locations over a single pair of wires. This is achieved by transferring power to the sensor and data back to the receiver using a 4-20mA current loop.
More information is available on the website of Industruino.