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Your current ADC sample value will be affected by the previous value due to charge in the sample hold circuit. One way to cancel the interaction is to sample a fixed value, such as ground, between each pot sample. You can test this by turning one of your pots all the way down, then changing your...

Sounding more like a bad solder joint, possibly caused by my soldering to 3.3 or GND. I do not see anything with my most powerful magnifier. Tomorrow, I will get out my microscope and try to see.

I tried an alternate USB cable. Also it did work on my Teensy 4.1. I am not in a hurry, so I can leave this available for forensics. If we run out of ideas, then I will reflow the board as last resort. I have another 4.0 outside controlling our Christmas lights that I will pull down tomorrow. I...

Well, it worked once. When I changed blink and tried to program... back to 9 blinks from boot loader. Do you think I should re-flow the solder? What temp do you recommend? I have regulated hot air available.

I'm not sure what happened, but it works now. I will try to describe for reference. I cleared the log, then plugged in the teensy. The log showed this: 14:32:17.248 (ports 6): unknown action: bind 14:32:17.249 (ports 6): unknown action: bind 14:32:17.253 (ports 6): unknown action: bind...

If I press the button, it immediately starts blinking and remains blinking after the 15 or more seconds holding it down. If I press the button and then plug in to USB, it immediately blinks 7 times, then blinks 9 times.

Yes, tried that. Here is the log: 14:06:50.977 (ports 6): add device: subsys=usb, type=usb_device, location=/sys/devices/pci0000:00/0000:00:14.0/usb3/3-3/3-3.4 14:06:50.977 (ports 6): devnode=/dev/bus/usb/003/094, subsystem=usb, ifacenum=-1 14:06:50.977 (ports 6): usb_add...

Thank you for that link. That gives me lots to study. I must be very lucky today to get this unlikely error;) I originally have a resistor divider going from 3.3 to A0 to GND with the intent to read several push buttons with a single input. I have moved that the the 4.1 and that works. Now I...

I have an original Teensy 4.0 that I just pulled out of the bag and soldered wires to 3.3V, GND, and A0. When I first powered it up with USB, the boot loader LED came up solid and would not program. I then held the button for over 15 seconds. After that, the loader updated the boot loader. That...

I had a similar problem with an NXP LPC1754. The Teensy analog system is probably the same. In between the analog MUX and the ADC is a sample and hold circuit. This circuit IS a capacitor. So each time you switch the MUX from on signal to another, then you couple the old level to the new...

Did you see this thread: https://forum.pjrc.com/threads/41504-Teensy-3-x-multithreading-library-first-release