brunofunchas
Full Member level 3
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Hi!
I would like to confirm if I have understood corretly the circuit:
I would like to confirm if I have understood corretly the circuit:
- SW05 Connector:
- One pin is connected to ground.
- The other pin is connected to the cathode of D7 (marked A62, 462, or A6).
- Voltage Measurement:
- Measuring between the two pins with a multimeter gives you 5V.
- Microcontroller Behavior:
- The MC68HC908 microcontroller likely has internal pull-up resistors to 5V.
- When you short the connector, it pulls the voltage down to ground, which the microcontroller detects.
- Single Wire to Ground:
- In one connector, a single wire goes to ground (static reel stand).
- When this wire is grounded, the board detects it.
- The detection happens because the wire connects to the cathode of a diode, allowing current to flow to ground without needing to close the circuit through the other pin of the connector.