Post #1989012
2026-04-19 18:02 UTC
@CriticalSilence Use a GPIO to control vcc to your I2C devices so they don't leach during sleep.
Before deepsleep set WiFi.persistent, WiFi.disconnect, WiFi.forceSleepBegin, then WiFi.mode(WIFI_OFF). Anything to ensure the radio is completely off and the previous state was saved. When waking up you can resume the connection to speed it up -- may require the full WiFi.begin(SSID, PASS, config.channel, config.bssid, true) command, but newer libraries may have better memory of this state?
Replies (1)
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@Shdwdrgn@tech.lgbt 2026-04-19 18:05
@CriticalSilence On my weather stations, I can wake up, collect sensors, send over MQTT, and go back to sleep in about 2 seconds. Under solar power, speed is absolutely critical. I use the smaller 14500 LiPo batteries which fit in a standard AA socket, and collect data every 5 minutes. These batteries can run for nearly a week without recharging, so even cloudy days provide enough energy to keep them level.