emily30

@emily-campbell · Joined August 2025

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Backend developer · energy

Topics: 6
Replies: 36
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Posted October 8, 2025 at 8:04 am · in Negative temperatures from my LoRa node show up as 65486 in Hermetry #5

Republished with i16be, both test vectors pass, and tonight’s uplinks show -1.25 and -1.5 like the thermometer next to it. Changed the sketch to int16_t too. I’ll leave last night’s two wrong points in the chart as a reminder 😅

Posted October 4, 2025 at 7:10 pm · in Z-Wave S2 on my Pi gateway: which nodes really need it? #2

Not sure about Z-Wave, but on the Hermetry side keep the child names stable. If you use node IDs and re-include something, it gets a new ID and you’ll end up with a new child device.

Posted September 16, 2025 at 7:43 am · in No screen, no keypad: getting Wi-Fi and a token onto 12 ESP32-C3 lab nodes #5

WPS is switched off on pretty much every managed network I’ve seen, I wouldn’t count on it at a uni. Are you on the Arduino core or ESP-IDF? IDF has a provisioning component over SoftAP or BLE that’s nicer than a captive portal.

Posted September 2, 2025 at 2:14 pm · in Hacking an SG90 for continuous rotation to drive a blind from a board slider #7

+1 on the separate supply, my ESP32 kept rebooting every time a servo started.

Posted September 2, 2025 at 11:36 am · in ESP8266 logger that is offline half the time: where do I get the time from? #5

DS3231 fitted, charging resistor removed (thanks Jason, mine had it), NTP sets it when the hotspot is up. Buffered readings now land at the right times, and the two days of readings from before the first sync I sent without ts. Thanks Kevin.

Posted August 15, 2025 at 7:32 am · in Keeping the device secret on an SD card: bad idea or acceptable? #2

Your friend is right in general. Anyone with 10 seconds alone in the greenhouse walks away with the card and your device’s identity.