rahulr29
@rahul_r29 · Joined December 2025
Engineering student · university · new to IoT
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Why does the concrete expanding with heat count as strain if nothing is pushing on it? Sorry if that’s a silly question.
Ordered a DevKitC with WROOM-32E N4. The box will be a plastic one under the roof edge, so PCB antenna it is. Thanks Brian, and everyone, the U and E part was what confused me most.
I did exactly this for a uni lab last term and got the same ERROR on BIND. The address comes out of AT+ADDR? with colons, but AT+BIND wants commas, in the order NAP,UAP,LAP:
AT+BIND=98d3,31,fb1234Full sequence that worked for us, both modules entered with KEY/EN held high at power-up (AT mode is 38400 baud):
slave A: AT+ORGL
AT+ROLE=0
AT+PSWD="4321"
AT+UART=9600,0,0
master B: AT+ORGL
AT+ROLE=1
AT+CMODE=0
AT+PSWD="4321"
AT+BIND=98d3,31,fb1234
AT+UART=9600,0,0Same PSWD on both, then power-cycle both without KEY held. Master pairs within a few seconds. After that it’s a plain 9600 serial line between the Unos.
The replay part is really nice, I didn’t know the map could do that.
ok so WROOM then. But E or UE?
Side question, are you even allowed to send telemetry over 4G from a drone where you are? Some places have rules about that.
For the LM317 design I think you set it to 13.8 V and add a current limit resistor, we did that in a lab once
Isn’t observability just the rank of the observability matrix? We did that in control class, but only for linear systems.
Genuine Uno, so the serial number worked. Script now finds it on any socket, and I added the reconnect loop. Banerjee, I’m sending the buffered ones as an array with ts now, the gap from this morning’s replug filled in.
Tor hides who you are talking to right? so if someone is watching the depot line they wouldn’t know you use Hermetry. isn’t that good?
The sensor survived!! Rewired with pinout open in another window, switched to the circuitpython library, and it reads 26.8 C and 61%. Readings are on my Hermetry dashboard now. I had the whole header mirrored, pin 2 for VCC like Ciaran said.
I can’t attach images yet (new account). The red wire is on the pin closest to the corner where the SD card is, the outer row, the one next to the board edge.
We pulled a 2-pair cable last week, used the second pair for 0 V, moved the shield from GND to the earth bar with a clamp, and put a 10 nF to earth at the far end. CRC errors went from ~3 % to 0.02 % over 4 days, and nothing changes when the fans start. The before/after chart is in my report now. Thank you.
Just A and B and the shield. The shield is connected to the gateway’s GND terminal right now.
Raised it on a 20 cm pipe piece and switched to your gpiozero code. Now steady readings, 43-45 cm when full, no zeros. Alarm rule is set at level_pct < 20 with 3 readings. Warden got his first real warning yesterday at 6 am.