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Hi,
I want to connect a current sensor (which is an analog sensor) to RaspberryPi via an ADC.
On the current sensor there are 4 ports as shown in attached figure.
+5V on sensor --- connected to ---- +5V on RPi
gnd on sensor --- connected to ---- gnd on RPi
My query is, what do these "out" and "o/c" pins mean?
Also,out of "out" and "o/c", which will get connected to my ADC input pin?
If somebody could please let me know these, I would be very much appreciative.
With the help of Google I found this:
+5v : 5v Supply
gnd : Supply Ground
out : Output Voltage proportional to current, 11mV/A for 5V supply
o/c : Over-Current Detection Digital Output, Low on Over-Current, High otherwise
Current=(Vout-2.5)/0.011
Note: Over Current can be detected by adjusting the preset for desired value of current [the blue potentiometer!].
Turn preset clockwise to increase current range and anti-clockwise to decrease current range.
On over current, o/c pin goes low and red LED glows.
I also found this Arduino topic, this example at RoboJax, and this YouTube video.
So my best guess:
OUT goes to the analog pin (ADC). In the Arduino Topic they are discussing the math as well:
float scalefactor = 0.011;
float current = ((5.0/1024.)*AnalogRead(A0)-2.5)/scalefactor;
(scalefactor derived from spec sheet: 11mV/A with a 5V power supply)
O/C goes to a digital pin to detect over-current (normal = HIGH. over-current = LOW).
I'm pretty sure that it is not required to use this pin, unless you'd like to detect over-current of course.
Hope this helps ... 😊
Hi Hans,
Thank you so much for your valuable feedback.
This was really helpful to me.
Awesome! Glad I could help 😊
