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Old 12-01-2021, 01:11 AM   #92
pjmoreland
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Join Date: Jan 2005
Location: CA
Posts: 5,334
Re: 700R4 TCC Wiring

I hooked the box up to my truck for the first time this evening, and it worked. I realized there's a minor issue with the way I'm controlling the LED on the toggle switch. My intention is to turn the LED on when the TCC is locked. The problem is that the power for the TCC is passed through the second set of contacts on the brake switch, so the Arduino has no way to sense when the brake is pressed. One way around this issue is that the vacuum sensor will go to zero when the throttle is closed since it is connected to a timed vacuum port on the carb. The LED will likely already be off before the brake is pressed. The one exception would be if I were to have my feet on the gas and brake simultaneously above 50mph. That's an unlikely scenario. I may add a connection from the brake switch signal to a digital input on the Arduino on my next revision of the PCB.

Next I need to write the code that monitors the vacuum sensor and unlocks the TCC during acceleration.
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