Experiment 2 - Water level check
Objective
To determine the level of any liquid
Application
It can determine the continuous liquid level monitoring of water, non-corrosive water or dry fluids.
Procedure
The eTape Liquid Level Sensor is a solid-state sensor with a resistive output that varies with the level of the fluid. It does away with clunky mechanical floats, and easily interfaces with electronic control systems. The eTape sensor’s envelope is compressed by the hydrostatic pressure of the fluid in which it is immersed. This results in a change in resistance that corresponds to the distance from the top of the sensor to the surface of the fluid. The sensor’s resistive output is inversely proportional to the height of the liquid: the lower the liquid level, the higher the output resistance; the higher the liquid level, the lower the output resistance.
Here we can calculate the output resistance from converting the ADC data in sensything. Below we measure the e-tape liquid level sensor output resistance.
Excerpts from the code:
float Vout = (float)((bit32*VFSR*1000)/FSR); //In mV
// convert the value to resistance
float reading = (1023 / Vout) - 1;
reading = 560 / reading;
Serial.print("Sensor resistance ");
Serial.println(reading);