The fix here is to rip out the reset controller, and use the charging of the RC circuit to drive the reset pin. Based on the calculator linked, I want: 140k resistor 1uF capacitor We'll see what I have on hand, but I'll try the already-mounted 10k / 1uF to start ladyada.net/library/rcca... - ThreadSky

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gworkman.bsky.social • 63 days ago

The fix here is to rip out the reset controller, and use the charging of the RC circuit to drive the reset pin. Based on the calculator linked, I want:

140k resistor
1uF capacitor

We'll see what I have on hand, but I'll try the already-mounted 10k / 1uF to start

https://ladyada.net/library/rccalc.html

Comments

genserver.be•42 days ago

I recently had to debug an rc circuit too. First time using a scope and all. What an adventure that was :) I think I fixed it in the end!

gworkman.bsky.social•42 days ago

Fun stuff :) Definitely a learning curve for oscilloscopes though. Was this for the brisket-o-meter?

I thought my issue was the RC circuit initially, unfortunately it was worse than that… a bad ground connection meant basically the entire digital portions of the chip didn’t have a voltage reference

genserver.be•42 days ago

No this was for my side hussle (https://loomy.be) that uses ESP32-based dongles to read out digital meters. I noticed when the meters powercycle, the dongle doesnt boot anymore. I had put a bigger cap on the voltage line to not draw too much power when BLE booted. Lessons learned :p

gworkman.bsky.social•41 days ago

Nice - very cool product!

gworkman.bsky.social•43 days ago

After a bunch of debugging, I determined the issue was due to a bad ground connection

`sunxi-fel --list` now outputs the chip ID. @nerves-project.org bringup via uboot and buildroot is next!

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