I ran the avrdude command line test from the setup guide and got the expected responses, when wired to an ATTINY841 chip.
Now when I try to program it with a blink sketch from Arduino IDE I get the error:
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avrdude: ser_open(): can't open device "\\.\COM3": The system cannot find the file specified.
Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.
The device is listed on Device manager (Win10) as USBTIny with driver ver: 1.2.6.0
I am using the ATTINYCore core by Spence Konde. I have Arduino IDE ver: 1.8.12.
It is trying to program through COM port 3, which is a port I usually use with the AF FTDI Serial TTL-232 USB Cable. As a matter of fact if I plug in this cable it tries to program through it (with nothing connected to it but the red Tx led blinks periodically).
I tried selecting the USBTinyISP programmer option, and the 2 other USBTinyISP programmer options listed in ATTINYCore (FAST, SLOW). All had the same response.
Can you please help me get my USBTinyISP programmer working?
Thanks!