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Attiny-wdt » History » Revision 2

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laforge, 08/10/2022 10:26 AM


attiny-wdt

attiny-wdt is an OSHW + open source firmware project of turning an Attiny{4,5,9,10} microcontroller into a hardware watchdog that can be used to reset another CPU/SoC when it gets stuck.

The primary use case was to use it with Raspberry Pi devices. Those do have a built-in hardware watchdog themselves, but unfortuantelly it is not documented at the register-level and there is no option to enable it straight from the boot loader, so it is not really providing the kind of guarantees one would expect from a watchdog.

Pictures

The pictures below show one of the first hand-soldered prototypes:

attiny-wdt1.jpg attiny-wdt2.jpg attiny-wdt3.jpg

Files (9)
attiny-wdt1.jpg View attiny-wdt1.jpg 310 KB laforge, 08/10/2022 10:24 AM
attiny-wdt2.jpg View attiny-wdt2.jpg 184 KB laforge, 08/10/2022 10:24 AM
attiny-wdt3.jpg View attiny-wdt3.jpg 286 KB laforge, 08/10/2022 10:24 AM
attiny_wdt_with_gulprog_cable.jpg View attiny_wdt_with_gulprog_cable.jpg 710 KB laforge, 08/23/2022 02:22 PM
guloprog_with_cable.jpg View guloprog_with_cable.jpg 476 KB laforge, 08/23/2022 02:23 PM
attiny_with_cable.jpg View attiny_with_cable.jpg 605 KB laforge, 08/23/2022 02:24 PM
attiny_wdt_v2_bot.jpg View attiny_wdt_v2_bot.jpg 348 KB laforge, 08/23/2022 02:28 PM
attiny_wdt_v2_top.jpg View attiny_wdt_v2_top.jpg 340 KB laforge, 08/23/2022 02:28 PM
attiny_wdt_led_test.jpg View attiny_wdt_led_test.jpg 718 KB laforge, 08/23/2022 02:30 PM

Updated by laforge almost 2 years ago · 2 revisions

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