12/31/2023 0 Comments Twisted transistor meanin![]() 01 seconds which sounds pretty reasonable. 1 MICRO Farads (10 to the minus 7 power) then T=10 to the -2 power or. The TIME factor the capacitor adds is calculated as T=R*C so if your pullup resistor was 100K (10 to the 5th power) and the capacitor was. (Do you know how fast it might be at maximum power?) The capacitor value you would need to experiment with. The on-off frequency of the electric meter is probably pretty slow. There are 2 or 3 other possible approaches:Īdd a capacitor across the Arduino input to ground to slow down the response. You're right about the probable cause, and the suggestion of changing the pullup value will also lower the impedance and decrease the noise VS signal. The phototransistor (LTR3208E) and its pull-up resistor (1MOhm) is at the electricity meter end of the cable, but I've also tried having the pull-up at the arduino end with the same result. If I send infrared pulses to the phototransistor I can see that they get through, but with so much noise that it's impossible to use.īeing a bit new to electronics, I imagine I've hit some kind of standard problem transferring signals over long cables, so I'm looking for an explanation of what's happening, and ideas on how to solve the problem? ![]() However, my electricity meter is located in a cabinet outside, so I've run a cable (unshielded 4x0.2mm, using three of the wires) which is about 10 meters long, and in this setup, I seem to get an unstable signal, with the digital input flickering between HIGH and LOW very quickly. I have a working circuit with phototransistor and pull-up resistor that is working well when I test it on breadboard and soldered to experimental board with a short (~1m) cable. I'm trying to build a power use monitor, reading infrared pulses emitted by my electricity meter using a phototransistor.
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