Exceptions

When pymata_rh detects an error, it raises a RuntimeError exception. The table below shows the exception report string displayed on the console when an exception is raised. A probable cause and troubleshooting tip is also provided.

Exception Report	Probable Cause	Troubleshooting
ERROR: Python 3.7 or greater is required for use of this program.	Unsupported version of python detected	Make sure that you are using Python 3.7 or greater.
No Arduino Found or User Aborted Program.	Com Port not found.	Make sure that you have the Arduino plugged in.
Firmata Sketch Firmware Version Not Found.	Valid firmware version not returned.	Make sure that you have a Firmata sketch installed on the Arduino.
Analog map retrieval timed out. Do you have Arduino connectivity, and do you have the correct Firmata sketch uploaded to the board?	Analog report request timed out	Self-explanatory.
User Hit Control-C.	User aborted the application.	Not Applicable.
Retrieving ID From Arduino Failed.	FirmataExpress handshake not returned.	Make sure that FirmataExpress was uploaded to the Arduino
Invalid Arduino identifier retrieved	FirmataExpress and pymata_rh Arduino IDs do not match.	Verify the Arduino IDs
write fail in _send_command	Serial write failed.	Check the serial cable.
Invalid mode requested for pin	The mode is not supported for the pin	Modify code to use valid pin number and mode.
Pin not supported	Pin number is not supported	Modify the code for a valid pin number.