Hello, I am a beginner in node red and would like to save the data from the dht22 sensor in mysql and display via chart. I have already tried a lot but unfortunately without success.
Hi OSD, thanks for your input.
Those are the 4 relays on IO-MCU. I buzzed out the circuit and found that I had an open circuit on the 12v line to the relays.
Furthermore 2 of the relays indicator LEDs were illuminating, 2 were not.
I suspect, when I first juiced up the circuit on this MCU, the 2 relays fired, but I'd made the trace too thin for the required current. I wired up some jumper wire on the reverse of the PCB and the 2 relays started working.
The 2 that remain inoperable?
https://forum.arduino.cc/t/using-pins-a6-a7-on-pro-mini-compatible/118050
A6 and A7 can only be analogue inputs, cannot be digitally written to..... - so this part of my PCB is now redundant.
However, all in all, some good fault finding, found the two issues, and I'm now going away to re-think my PCB trace widths and reading the datasheets more accurately
Thanks
Hi all,
Should anyone face the same problem, I found the root cause: brownout threshold. I burned a new bootloader (Optiboot 8.0) without such trigger and the node has been working with used batteries (~2.7V) since May.
Hope this helps.
Don't ask me why, but now it works. I changed nothing! Went to my girl over the weekend, coming back, the node was registred. Maybe a jammer went away?
I don't know if any of you guys are still around and using this stuff -
I moved and am reviving a few of these 51/52 boards that I had built. Prior to moving I had decent luck with all these fixes though I don't quite remember where I was with any of this stuff seeing as it was 3 years ago.
I had a few motion sensors and some temp/humd based on these fixes and they were working great, no dips.
Not sure any of you will ever see this but hey it all worked.