Pulse Count Sensor Wiring

[Robert.Wall]

@pb66

He has done some testing of the output from these sensors

There are details (as best we can extract from measurements plus one that was disassembled) here:

First try with EmonPi - Pulsecount stuck at 1

Some measurements: I used a white LED reading lamp, with several layers of draughting film over the front to attenuate the light. The sensor was therefore looking at a bright but diffuse patch of light approx. 30 mm in diameter. EmonTx V3.4 Condition Output voltage Distance to light source Just detecting logic '1' 1.42 V 570 mm LED just visible 3.28 V 460 mm LED bright 3.28 V 400 mm EmonPi Condition Output voltage Distance to light source Just detecting logic '1' 1.35 V 710 …

I’m using the optical sensor on an emonPi at the moment, and it’s certainly susceptible to a fluorescent light (with a glow-tube starter) nearby being switched on, to the extent of tens of pulses if the pulse repetition period is set to zero. A few days ago, it saw 18 kW in one 10 s interval - the c.t. saw 154 W.