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TinyWD

This is a hardware watchdog with a ATTiny85, build for Arduino and other MCU directly pluggable to the ISP connector.

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This is a hardware watchdog, built with an ATTiny85. The aim is to retrofit an existing controller board with a watchdog. Because sometimes the watchdog built into the chips is not enough or is not reliable enough. That's what happened to me with my barrel pump project. The watchdog built into the ATTiny84 could not reliably protect the controller from freezing. I had to reset the controller by hand again and again. Of course there are also ready-made watchdogs, mostly in transistor or DIP-8 form. But they were difficult to obtain and besides, it's fun to design something like this yourself. That's why I built this hardware watchdog based on the ATTiny85, which can be plugged onto a normal 6-pin ISP programming connector. But first I designed a variant for the Digispark to test the basic functionality. The advantage of the ISP plug-in variant is that you rarely use the ISP pins for your own circuit.

tonnenpumpe_v1.mp4

see the watchdog in action

MPEG-4 Video - 8.63 MB - 10/07/2024 at 13:38

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  • 1 × ATTiny85 (PDIP or SMD)
  • 1 × LED green (THT/SMD)
  • 1 × LED red (THT/SMD)
  • 2 × 1K5 Resistor (for LowCurrent LEDs)
  • 1 × 10k Resistor

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Gerben wrote 10/07/2024 at 15:03 point

Nice idea to use the ISP header.

It would have been funny if the attiny85 used it's build-in watchtimer too (-;

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Wilfried Klaas wrote 10/08/2024 at 08:29 point

At the moment, not. It's running full speed (8MHz) with the internal RC Oszi.
Nothing to save power, no sleep mode, etc... not yet.

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