Apologies for posting such a well-trodden question, but my Mac is not able to see my new Teensy 4.
Steps I've taken:
1) I've been using various Teensy devices for years. This week, I've been working on a Teensy 3.0.
2) I purchased 2 brand new Teensy 4.0s (from OSH Park)
3) My installed software was old enough to not include Teensy 4.0 support
4) I downloaded the latest Teensyduino, which supports Catalina
5) I wasn't running Catalina, and the new Teensyduino wouldn't run on my older OS X
6) I upgraded to Catalina
7) Ran into some permissions issues while trying to compile a sketch for Teensy 4.0
8) Found a forum post about how to fix the permissions issues (delete all Arduino related files from various places in my filesystem). It worked!
9) Successfully compiled an example sketch for Teensy 4.0
10) Plugged in my Teensy 4.0 and saw the blink sketch running happily
11) Pressed the program button and saw the blinking stop and the red LED near the USB connector illuminated
12) Teensy loader UI did not change, doesn't seem to see my Teensy 4.0
13) `ls -l /dev | grep -i usb` shows nothing
I realize the troubleshooting page, given the above info, suggests that my USB cable is bad. That is possible, but unlikely. I've used this USB cable with many Teensy devices, including just yesterday! It seems more likely that this is related to all the software upgrades I performed to get here.
Steps I've taken:
1) I've been using various Teensy devices for years. This week, I've been working on a Teensy 3.0.
2) I purchased 2 brand new Teensy 4.0s (from OSH Park)
3) My installed software was old enough to not include Teensy 4.0 support
4) I downloaded the latest Teensyduino, which supports Catalina
5) I wasn't running Catalina, and the new Teensyduino wouldn't run on my older OS X
6) I upgraded to Catalina
7) Ran into some permissions issues while trying to compile a sketch for Teensy 4.0
8) Found a forum post about how to fix the permissions issues (delete all Arduino related files from various places in my filesystem). It worked!
9) Successfully compiled an example sketch for Teensy 4.0
10) Plugged in my Teensy 4.0 and saw the blink sketch running happily
11) Pressed the program button and saw the blinking stop and the red LED near the USB connector illuminated
12) Teensy loader UI did not change, doesn't seem to see my Teensy 4.0
13) `ls -l /dev | grep -i usb` shows nothing
I realize the troubleshooting page, given the above info, suggests that my USB cable is bad. That is possible, but unlikely. I've used this USB cable with many Teensy devices, including just yesterday! It seems more likely that this is related to all the software upgrades I performed to get here.