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How to calculate a simple mixed parallel/series re.batteries - Is soldering wires directly on a NiMh.capacitor - Flyback transformer - ambiguous schema.Resources I've found while researching this:ДЄny help / suggestions here would be greatly appreciated. It should provide 1.05mA to the Pi - I'm not sure if this is enough for input purposes. Will give 3v at the Pi when DATA goes to 12v, but will fry the GPIO pin if the voltage goes above 13.5v. Simulate this circuit вЂ“ Schematic created using CircuitLab Use resistors as a voltage divider - This is the route I was planning on going. Use a logic shifter chip - Possibly, but I dont know how to find the right one for my needs, and it has to have high impedance so as to not disrupt the keybus circuit.

Use an Optocoupler - Not a good solution as I've heard they are slow and draw a lot of current on the transmitting side. I'm concerned that if I dont have a high impedance circuit, that the Raspberry Pi will act as a drain on the circuit and disrupt communications between the alarm panels (bad!). My question is how best to connect these two, with the Pi purely just eavesdropping on the keybus - I dont need to write to it, just read from it. The Raspberry Pi has a 0 - 3.3V logic level, With anything above 2.8V being HIGH. The Logic is 0-12V I believe (I tested with a multimeter since I dont have a scope and got 12.84v on the +12v and a continually changing 6-8V on both Data and Clk lines as to be expected.) The clock runs at 1khz from what I've heard. The Keybus is a 4 wire serial data bus - +12V, Ground, DATA and CLK. I would say my knowledge of electronics is novice to intermediate. I have a DSC 1864 House Alarm and I want to connect up my Raspberry Pi's GPIO to the Keybus (a serial data communication protocol used by the alarm).