hi; i purchased 3 of these,
AZDelivery 3 x AZ-MEGA2560-Board Bundle with Prototype Shield
and each is reporting the error message below.
I have triple checked every aspect of the set up and all seems in order, cable devices port, board reburn bootloader et al . I have substituted an arduino uno and it works fine; could you help please
Thanks
Martyn
'avrdude: ser_open(): can't set com-state for "\\.\COM3"avrdude: ser_drain(): read error: The handle is invalid.avrdude: ser_send(): write...