SparkFun Forums

[mysparkfun71451]

Can I cross connect digital pins to analog pins on the RedBoard Artemis (DEV-15444)? I am setting the voltage on the D+ and D- wires of a USB cable with connections to digital pins that are configured as OUTPUTs for voltages of 0 or 3.3V or INPUTs for a floating state between 0 and 3.3V that is set by a voltage divider circuit. I want to monitor the voltage on the D+ and D- wires by connecting them to analog pins configured as INPUTs and then using analogRead() and Serialprint() to display the values. This will result in a cross connection between the digital and analog pins. The USB cable is providing power to the RedBoard via connections to VIN and GND.

[TS-Chris]

It's not anything we've tried, but as long as your analog pins are configured as an analog input only, I don't see an issue. It might be a good idea to pop a 10K resistor in between the analog and digital pins just in case you accidentally set them to an output while they are connected to 3.3 volts from another pin.

[mysparkfun71451]

Thanks for the suggestion to use a 10K resistor to protect the pins. This should not cause a significant change in the voltages on the analog pins that I want to display.