Recent content by Michael Kennedy

Well, I desoldered and replaced all the components giving wonky voltages (see post #11). This included several resistors, the MOSFET, 100uF and 0.1UF capacitors, inductors, ATMEGA (x3), the IC socket, PI header, and LCD PCB header. I'm sure I'm forgetting a few more. Nada. It would seem...

Q: Even without the LCD board connected, I can’t flash the AVR via Linkmeter. So it would seem that the issue is with the main board, not the display board? Because there are a bunch of things I’ve swapped out, It might be helpful to recap results. (1) Original issue: RPi(v2018), ATMega (old)...

Gary - Thanks for the suggestions. I tested ac. It’s at ~20mv, well below the 300mv threshold. 4A power supply. HM has run well with this unit since I built it. Unit also powers fine using RPi microUSB. Tried SD Card Formatter to prep the card. Unfortunately, no success. I don’t think it’s a SD...

Continuity/Voltage test results: Per Bryan's recommendation, I confirmed continuity between MOSI, MISO, SCK, and RESET from ATMega to pi header were good. However, under 12V barrel power detached from the Pi, a number of voltages were off. Red boxes indicate measured voltages significantly...

A bizarre new twist: The new 2022 RPi 3A+ I've been using to help solve this issue appears incompatible with HM v15 (or other versions). I've tried every possible HM version on the 2022 RPi. Every single one causes a kernel panic. However, When I took the SD out of the 2022 RPi and put it into...

... the core issue seems to be that the 3A+ RPi alone, no HM, fails to boot with any v15 HM build (Heatermeter AP, AP, or Client) or the dev snapshot. Kernel panic each time (RPI green LED 4 slow flash, 7 rapid). This is not normal, right?

Mark - I tried cleaning pins with an acetone Q-tip. Used compressed air for female connectors. No fix. I discovered something interesting, though. While scanning a few other hardware-related threads, I found one involving fan/servo issues. @Steve_M proposed a simple test to check the fan...

... and just for kicks, I re-flowed and touched up all the RPi header and ATMega solder points (chip removed).

Update: (1) Received the new AT Mega (ATMEGA328P-PU) from Digi-Key, popped it in. Booted up. As one would expect, HM LCD showed all black bars - which should resolve once RPI fully boots and runs the script to flash ATMega. However, this never happened even after 30+ min. Noticed the RPI LED...

Gary and Mark - thanks for the suggestions! This unit has been used extensively in cold weather conditions (Chicago!), so a micro crack is definitely a possibility. I took a look at all the joints and ceramic parts under a magnifying glass. Did not see any cracks. All of the socket connectors...

Hello - long time lurker and admirer of all the expertise on this forum. Built my HM 8 yrs ago; the advice/guidance has been invaluable, with hundreds of BBQ-satisfied family & friends served.Thank you! Am hoping someone can help with what I think is a hardware-related network issue. I’ve read...

Hello! I'm a new member to the Forum - and just finished my first HM build (v4.3.3, v13 firmware). I'm having some issues when testing out the RPi (A+) married to the base board. The HM connects to my network A-OK, and OpenWrt loads fine. But I get the dreaded "OK" status under the "Available"...