https://github.com/atoomnetmarc/reset-timeout

Prevent microcontroller reset after power-on using an extra tiny microcontroller.
https://github.com/atoomnetmarc/reset-timeout

microcontroller

Last synced: 6 months ago
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Prevent microcontroller reset after power-on using an extra tiny microcontroller.

• Host: GitHub
• URL: https://github.com/atoomnetmarc/reset-timeout
• Owner: atoomnetmarc
• License: apache-2.0
• Created: 2021-02-05T12:05:17.000Z (almost 5 years ago)
• Default Branch: main
• Last Pushed: 2021-03-06T12:24:45.000Z (almost 5 years ago)
• Last Synced: 2025-03-29T07:14:36.640Z (9 months ago)
• Topics: microcontroller
• Language: C++
• Homepage:
• Size: 46.9 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
*Failed 3d-prints hate this schematic. Eleminate microcontroller resets with this one weird trick.*

This schematic is part of another project: a replacement 3d-printer motherboard. Connecting USB midway into a 3d-print results into a failed print because the microcontroller is automatically reset by flashing DTR.

So I devised this simple circuit. An ATTINY13 microcontroller with simple programming: passthrough DTR pulses to RESET upto 120 seconds after poweron. In that way you can still update the firmware, but no unwanted resets anymore.

![](schematic.png)

Flash the hex-file using your favorite programmer. Use these fuse settings:

LOW: 0x7A\

HIGH: 0xFB\

LOCK: 0xFF

[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)