Some diagnostic information is written to the UART including error messages if scoppy enounters an unrecoverable error
2 & 3
Input - pulled down
CH1 Voltage Range
Currently selected voltage range for channel 1
4 & 5
Input - pulled down
CH2 Voltage Range
Currently selected voltage range for channel 2
6 to 13
Input
Logic Analyzer inputs
Connect up to 8 digital sources (0V to 3.3V)
22
Output
Test signal
PWM 1kHz 50% duty cycle - can be connected directly to either of the ADC inputs
26
Input
CH1 ADC input
Connect the +ve output of your analog frontend (or signal source) here. Connect the ground of the analog frontend (or signal source) to GND.
27
Input
CH2 ADC input
Connect the +ve output of your analog frontend (or signal source) here. Connect the ground of the analog frontend (or signal source) to GND.
Please note that the test signal and voltage range GPIO assignments changed in version 4 of the firmware (previously they were GPIO 16 and 22 for the test signal, 3 and 4 for the channel 1 voltage range and 6 & 7 for the channel 2 voltage range).