Hermetry

Posted October 31, 2026 at 2:00 pm · in Freezer at -12.5 C shows up as 65411 after going through my Modbus slave #6

The raw -= 65536 fix works, Hermetry shows -12.5 now and the chart doesn’t jump to 6000 anymore. Yesterday’s 6541 points are still sitting in the history, but everything new is right lol. Thanks Aoife.

Posted September 1, 2026 at 2:57 am · in Gateway datasheet says the 24 V digital inputs draw a ‘current load’. What does that mean for my sensors? #5

That explains it, thanks Ciaran. We swapped the NPN proxes for PNP ones (the lab had some), the door and float switch go from +24 V to the inputs, all four show 0/1 in Hermetry now.

Posted August 31, 2026 at 1:13 pm · in Gateway datasheet says the 24 V digital inputs draw a ‘current load’. What does that mean for my sensors? #3

We only need on/off states, no counting. Good to know though.

Posted July 26, 2026 at 1:10 pm · in ESP32 connects in setup() but client.connected() is false a few seconds later in loop() #5

Fixed, but it was two things! Log tab showed keepalive_timeout AND “Taken over by a new session”. My first breadboard prototype was still plugged into a USB charger at home with the same token. Unplugged it, switched to the millis() version, and the device has been online for 6 hours.

Posted July 10, 2026 at 2:32 am · in Request: let rules weight a model’s prediction by its confidence (feed-forward setpoints) #5

Got it working on the lab furnace with clark.c’s script and a 10-minute expiry on the Pi side. My first deploy didn’t fire because I’d put the blocks before Save telemetry on the wrong branch, moved them after it. Leaving the request open in case a no-code version ever appears, but the flow does the job for my thesis.

Posted June 4, 2026 at 2:18 pm · in Can I switch my heater relay at home from my phone while I’m on campus? #6

it works!!! tested from the bus. One thing that tripped me: I first made the command Privileged because it switches mains and the switch on the board just said it can’t be sent from a board. Changed it to Basic and it went through. Also I subscribe in on_connect now like you wrote, before it stopped working after the Pi’s Wi-Fi blipped.

Posted June 1, 2026 at 6:16 pm · in Can I switch my heater relay at home from my phone while I’m on campus? #4

oh so the cloud can talk back to it? How does the phone come into it though?

Posted April 16, 2026 at 3:40 pm · in XBee link drops packets and only manages a fraction of the 250 kbps it advertises #6

Switched to API mode with 10 samples per frame and the radio side is clean now, no lost frames in 20 minutes. The Pi sends x/y/z RMS and peak once a second. My supervisor actually prefers the RMS chart. I didn’t know about the per-device limits at all, that explains the warnings.

Posted April 8, 2026 at 1:45 pm · in XBee link drops packets and only manages a fraction of the 250 kbps it advertises #3

Yes. One Serial.println per sample.

Posted February 12, 2026 at 1:04 pm · in ESP32 analogRead stuck at 4095 as soon as WiFi connects #7

Could it be a library conflict with the MQTT lib?

Posted September 6, 2025 at 2:12 pm · in snprintf on a Nano prints ? instead of my float when building the JSON payload #5

oh nice, didn’t know about dtostrf at all

Posted August 31, 2025 at 11:29 pm · in snprintf on a Nano prints ? instead of my float when building the JSON payload #2

is it a printf setting in the IDE? I think there’s a flag for floats somewhere

Posted May 28, 2025 at 2:10 pm · in SPECK and SIMON for my thesis: why are they called IoT ciphers, and could a sensor use one instead of TLS? #4

This helps a lot. I think I had “cipher” and “protocol” mixed up in my head. New plan for the practical chapter: benchmark SPECK64/128 against ChaCha20 on the ATmega328P (cycles per byte, flash, RAM), and keep the ESP32s on normal TLS to the broker. My supervisor laughed at the “instead of TLS” part when I explained the key exchange bit, so I think he was joking anyway.

liam96

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