Dear All,
I am using Photo Interrupter Sensor to count the number of water drops. The problem i am facing is that when the drops falls, sometimes it falls on the slot and after that the voltage is always high (700-800) and even the drop is not falling, the readings remain the same.
Can anyone please tell me what should i do in this case? can anyone recommend me a better sensor?
I look forward to hearing from you soon.
Best Regards
Rushan
Can anyone please tell me what should i do in this case?
Use a towel to dry the sensor.
Maybe I missed something...
You need to use an interrupter with a wider gap.
Try a Google search for "SWITCH SLOTTED OPTICAL WIDE GAP".
Optical interrupter may not be the best approach....
You may like to experiment with two thin metal plates either side of the drop trajectory, and measure changes in capacitance - but still have to be far enough that the plates don't get wet.
Depending on the liquid and volume, optical could be tricky to get consistency.
You could try a slot sensor.
If splashing wouldn't be an issue, I would maybe opt for a vibration sensor attached to a large enough piece of flat plastic.