LED Blinkenlight CF/EC meter code for Arduinos
This code uses an Arduino to measure a voltage difference accross the analogue ports using A/C. This allows the conductivity of a salt solution to be measured without electrolysing the liquid under test.
Measurements can be read out via the Arduino USB prot or used to light up a configurable line of LEDs.
The LEDs are strobed one at a time, allowing a single current limiting resistor to be used.