Got back from Mayo to two packages containing my photo resistors and transistors.
Aim to use theses to detect the LED pulses from OMNIpower smart electricity meter
Looks like a 47KR will do the trick according to this website:
https://forum.arduino.cc/t/phototransistor-usage/190418/10
https://learn.parallax.com/tutorials/robot/shield-bot/robotics-board-education-shield-arduino/chapter-6-light-sensitive-15
Long lead is collector C and shorted lead is emitter E
A 5v to C and a 2KR from E to GND with A/D sampling at E pin should do this trick :)
Once I've determined the voltages I can refine the Arduino sketch
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