I would like to identify the state of 3 switches, sw 1, 2 & 3 and when power is supplied to a fan …… so 4 indicators – assume these would be LED. I.1 – I.4
Sketch is attached.
Input 1 – is satisfied when switch one is closed, this is a simple 12V DC cct
Input 2 - is satisfied when Switch 2 & 3 are closed The output voltage is then provided to the fan, this is a variable voltage from 0 to 12V DC
What I want to ‘add’ are 4 indicators, showing state of each switch, and when there is any power to the fan. So I would need a way of identifying any voltage present and changing to an on or off ‘switch indication’ Trying to think of an easy way …. I could use a voltage comparator to detect a difference between fan driver voltage & ground, but as there are 2 switches as well …. Assume then it's 3 comparators, so getting complicated. The ‘comparator modules’ are an option
The switched are spst plungers, with no option to change them to give another set of contacts.
Anybody any suggestions, the simpler the better - no Arduino skills or similar … just need a few ideas on this.