wl705 arduino water level sensor

Other Hardware Sensors
1

somebody knows how can i implement this sensor in arduino to use in weather level measurement? I know i must use the sensor range vs mA, but i dont know where start. I appreciate your help.

Specifications:

Sensor Range: WL705-012 4” (.33’) - 144” (12’)
Supply Voltage: 10-30VDC (sensitivity reduced below 15 VDC)
Supply Current: 40mA
Averaging Time: 15 seconds
Temperature: -40º to +158º F Output Current:
4mA, maximum distance
20mA, minimum distance
Connections: Brown +15-30VDC
Blue Ground
Green 4-20mA output (WL705-048)
Black 4-20mA output (WL705-012 & WL705-003)

2

If I understand this correctly you have a 4-20 mA output. To read that output, connect it to a 125Ω resistor as load, then measure the resulting voltage over that resistor on an analog pin. 4 mA = 0.5V = ADC reading 102, 20 mA = 5V = ADC reading 1023.

Assuming 4 mA = 4", 20 mA = 144", use map() to convert ADC reading to height.

In code:

float height = map(analogRead(sensorPin), 102, 1023, 40, 1440) / 10.0;
3

Thanks a lot, can i use this diagram?

1169×528 254 KB

4

Yes, that's the idea.

5

how do you calculate the / 10.0; value?

6

prodisoft:
Thanks a lot, can i use this diagram?

This approach is better (see post #4).