I'm trying to program an arduino mini pro while it is connected to a Bluetooth module through RX and TX pins. Basically the ftdi is connected to the same pins as the Bluetooth module on the arduino.
Obviously if the Bluetooth is powered it should not work. So I decided to put a transistor on there to switch the low side of the Bluetooth thinking that it might solve my problem.
Seems like it doesn't work... Worst of it I don't really understand why. My only hypothesis at the moment is that the TX pin on the Bluetooth module can't drain and remains high thus killing the signal from the ftdi to the arduino... Does that make any sense?
Should I expect the same result switching the high side.
Obviously if the Bluetooth is powered it should not work. So I decided to put a transistor on there to switch the low side of the Bluetooth thinking that it might solve my problem.
Seems like it doesn't work... Worst of it I don't really understand why. My only hypothesis at the moment is that the TX pin on the Bluetooth module can't drain and remains high thus killing the signal from the ftdi to the arduino... Does that make any sense?
Should I expect the same result switching the high side.