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I'm using Digispark Pro with my program successfully. I bought new ATtiny167 chip for custom PCB board (for HID USB device). I use the scheme from: https://electrobattery.ru/product/plata-arduino-digispark-pro-attiny167/ and this is not working. Result is: “Unknown USB Device (Device Descriptor Request Failed)”.

What I tried:

  1. I read fuse from my digispark pro (E:FE H:DD L:DF). I wrote this fuse successful. I read flash from my Digispark Pro . I wrote this flash successful. Not working.
  2. I tried this variant: How to write a bootloader and drivers for ATtiny167. same result.
  3. i Tried micronucleus 2.04 (https://github.com/micronucleus/micronucleus) with both fuse variants. same result.

Part2: I solder out chip (old chip) from my working digispark pro, which successful work with USB. And tried use this chip on my breadboard. Result: “Unknown USB Device (Device Descriptor Request Failed)”

I tried another variant: i took new chip and soldered it in digispark pro. Try 6 combination: 2 variant of fusses and 3 variant of flash (probootloaderr2.zip from http://digistump.com/wiki/digispark/tutorials/proisp; t167_default.hex dвdrom https://github.com/micronucleus/micronucleus/tree/master/firmware/releases and readed flash from my Digispark Pro). Result: “Unknown USB Device (Device Descriptor Request Failed)”

I returned old chip to digispark pro. everything works good.

WHAT the problem((( Please help

I only write fuses and flash to chip. May be i have to do anything else?

Please help.

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    \$\begingroup\$ Custom pcb? You copied the "Digispark" schematic, did you also copy the board layout and impedance matching for the USB data lines? Can you provide your layout/schematic? \$\endgroup\$
    – Ron Beyer
    Commented May 22, 2020 at 19:14
  • \$\begingroup\$ I added schematic. please see \$\endgroup\$
    – Алекс Алекс
    Commented May 23, 2020 at 5:32
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    \$\begingroup\$ Avcc and Agnd must always be connected to power and ground, even if you're not using the adc. \$\endgroup\$
    – BeB00
    Commented May 23, 2020 at 5:40
  • \$\begingroup\$ I connected pin 5 to VCC and pin6 to GND. And try again. same result( \$\endgroup\$
    – Алекс Алекс
    Commented May 23, 2020 at 7:30
  • \$\begingroup\$ If pins 5 and 6 are connected then you should show them on the schematic. GND symbols should be pointing down (towards the ground). The GND symbol represents metal plates buried in the ground. \$\endgroup\$
    – Transistor
    Commented May 23, 2020 at 8:00

1 Answer 1

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I hope you did not copy the schematics. The schematics have power supply pins to the ATTiny167 not connected, so obviously it won't work.

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  • \$\begingroup\$ I added my schematic. please see. power supply is connected \$\endgroup\$
    – Алекс Алекс
    Commented May 23, 2020 at 5:33
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    \$\begingroup\$ No, half of the power supply pins are disconnected. See pins 5 and 6. \$\endgroup\$
    – Justme
    Commented May 23, 2020 at 7:11
  • \$\begingroup\$ I connected pin 5 to VCC and pin6 to GND. And try again. same result( \$\endgroup\$
    – Алекс Алекс
    Commented May 23, 2020 at 7:30
  • \$\begingroup\$ I only write fuses and flash to chip. May be i have to do anything else? \$\endgroup\$
    – Алекс Алекс
    Commented May 23, 2020 at 7:55
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    \$\begingroup\$ Maybe the AVR is already broken as it was half-powered? Have you tried with an AVR that is known to be working? \$\endgroup\$
    – Justme
    Commented May 23, 2020 at 8:01

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