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I only had a single transistor left when I started building a prototype write circuit. So I built this: I thought that with I'm very confused as to why. Is my understanding of how the circuit works incorrect? Or am I doing something wrong here? |
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The transistor you removed is part of NOT gate. In my circuit when optocoupler is not active you see a "HIGH" level in A-B If you want to experiment new solutions without burning anything, there is a file (https://github.com/issalig/toshiba_air_cond/blob/master/circuitjs.txt) you can use in https://www.falstad.com/circuit/circuitjs.html |
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The transistor you removed is part of NOT gate. In my circuit when optocoupler is not active you see a "HIGH" level in A-B
With your circuit, you should invert SoftwareSerial signal but only for writing or also modify the read circuit.
If you want to experiment new solutions without burning anything, there is a file (https://github.com/issalig/toshiba_air_cond/blob/master/circuitjs.txt) you can use in https://www.falstad.com/circuit/circuitjs.html