Can't program ATTiny85 using USB to TTL adapter

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1

Hi! I have a problem, I have an ATtiny85 with the bootloader burned trough isp and I want to reprogram it after it was soldered so the easiest way I thought it to program it using an USB to TTL adapter, connected the TX pin of the adapter to the PB1 pin of the ATTiny, RX to PB0, connected grounds together, and DTR in series with a 0.1uf capacitor then connected to the Reset pin(PB5). The ATtiny is powered by an onboard battery. It keeps saying "Failed uploading: uploading error: exit status 1".

Sketch uses 6240 bytes (81%) of program storage space. Maximum is 7616 bytes.
Global variables use 295 bytes (57%) of dynamic memory, leaving 217 bytes for local variables. Maximum is 512 bytes.
"C:\Users\totan\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino18/bin/avrdude" "-CC:\Users\totan\AppData\Local\Arduino15\packages\ATTinyCore\hardware\avr\1.5.2/avrdude.conf" -v -pattiny85 -carduino -PCOM6 -b19200 -D "-Uflash:w:C:\Users\totan\AppData\Local\Temp\arduino\sketches\75F6D233B07A6E09980C306583E34BAA/F1E_Electronic_Timer_ATtiny85.ino.hex:i"

avrdude: Version 6.3-20201216
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2014 Joerg Wunsch

     System wide configuration file is "C:\Users\totan\AppData\Local\Arduino15\packages\ATTinyCore\hardware\avr\1.5.2/avrdude.conf"

     Using Port                    : COM6
     Using Programmer              : arduino
     Overriding Baud Rate          : 19200
     Setting bit clk period        : 5.0

avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0xaf
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0xaf
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0xaf
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0xaf
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0xaf
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0xaf
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0xaf
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0xaf
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0xaf
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0xaf

avrdude done. Thank you.

Failed uploading: uploading error: exit status 1

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2

But when you tested it before soldering, you were able to reprogram it?

3

trough ISP yes

4

No, I meant you were able to do what you are attempting now, to program with USB-Serial.

5

The main reason that I want now to program it with USB Serial is to have the Serial Monitor available to troubleshoot the code because it seems there is a problem. I didn't try before to program it with USB Serial.

6

1. Are you sure that you have loaded the Digispark's Boot Loader Program into your ATtiny85?
Digisparkbootloader.zip (3.9 KB)

2. If you loaded the above Boot Loader Programmer, then the ATtint85 will be seen by the PC as a USB (NOT COM) device for which you need to install driver.
Digistump.Drivers.zip (1.6 MB)

3. It would be conveneient for you to collect the following board to play with ATtiny85.
Digispark Bootloader

4. If you are not interested in the Board of Step-3, then paly with ATtiny85 Programming using Arduion as ISP Programmer.

7

I didn't load the Digispark Boot Loader, I selected ATtiny45/85(Optiboot) and burned the loader from the tools section

8

Disclaimer: Not familiar with ATtiny85.

You don't have to upload using USB. You can upload using a programmer and ICSP and debug using the serial output.

9

Do you have the correct clock rate selected (ie matching what you used for “burn bootloader”)?

10

I don't understand... I cannot set any baud rate...

11

is serial communication available in this state?

12

Do you know that UART Port is not supported by ATtiny85? However, you can emulate a TX-pin using codes in order to present the debugging messages on the OutputBox of the Serial Monitor.

13

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