Douglas George
New member
Hello everyone, I'm new here but recently bought a few of the last 4.3.6 boards because I like projects like this and have been wanting to have more control when smoking on my kamado. I built my first board and am having a problem with the thermocouple circuitry. Originally, when I switched it to thermocouple from thermistor it would just read "Off" on the web interface, but I believe I had the .1u and the 1n caps shorted together that are located just below the thermocouple amp. Once I removed and resoldered those, I did get a reading. However, it started at 800+ degrees and slowly dropped and is now hovering around 94 degrees. It took quite a while to drop this much. It sounds like the same problem that was reported (but never solved) here.
I've reflowed solder to everything on the TC circuit, but it has not changed anything. I've put a paperclip in place of the TC and it reads about the same, around 100 degrees and slowly rises, presumably because of my body temperature while holding the paperclip? One thing that I noticed is if I blow on the TC circuitry, it immediately will say "no pit probe" and then a second or 2 later will show a reading again but it will be back up in the 400 - 500 degree range and then work its way back down.
Does anyone have any suggestions or know if a solution ever determined for the problem I linked above? I do have another full set of components with the exception of the TC connector and LCD display, but I was hoping to build a backup Heatermeter and not be short more components.
A few other notes;
Doug
I've reflowed solder to everything on the TC circuit, but it has not changed anything. I've put a paperclip in place of the TC and it reads about the same, around 100 degrees and slowly rises, presumably because of my body temperature while holding the paperclip? One thing that I noticed is if I blow on the TC circuitry, it immediately will say "no pit probe" and then a second or 2 later will show a reading again but it will be back up in the 400 - 500 degree range and then work its way back down.
Does anyone have any suggestions or know if a solution ever determined for the problem I linked above? I do have another full set of components with the exception of the TC connector and LCD display, but I was hoping to build a backup Heatermeter and not be short more components.
A few other notes;
- The thermistor ports all seem to be working properly / reading properly.
- I used the ATMEGA328-PU (non- "P") instead of the ATMEGA328P-PU
- I used the AD8497ARMZ instead of the AD8495
Doug