Pseudonymous maker “Rednexing” has constructed an Espressif ESP32-S2-based sensor board designed for a low sufficient energy draw to run from three AA alkaline batteries for a powerful three years.
“I want to regulate for danger of mildew in areas which are laborious to entry and with no energy, like crawl house, attic, storage constructing, and many others.,” Rednexing explains of the concept behind the sensor system. “I wished a board to measure temperature and humidity, but in addition be capable to hook up different sensors and capabilities. I solely have to measure as soon as an hour, and sleep the remainder of the time, which suggests this board will run for greater than three years.”
Designed to suit on the again of a three-AA-battery holder, this intelligent sensor board runs for as much as three per set of batteries. (📷: Rednexing)
The compact board is designed to sit down on the again of a three-battery AA holder, taking on the identical footprint — delivering a tool sturdy sufficient, its creator claims, that it would not want any form of enclosure for indoor use. 3.3V and battery-level energy outputs for exterior sensors, which may be related to general-purpose enter/output (GPIO) pins damaged out on 0.1″ headers and screw terminals, are switched on solely when the board is energetic to chop down on energy drain — although always-on outputs are additionally obtainable.
A USB Kind-C connector is offered for programming the Espressif ESP32-S2-MINI module, which additionally gives Wi-Fi connectivity, and there is an on-board Aosong ASAIR AHT10 temperature and humidity sensor — plus analog-to-digital (ADC) channels for exterior analog sensors. The sensor board is designed to be used with the ESPHome firmware, permitting it to combine into Residence Assistant with ease — although, Rednexing warns, it doesn’t assist over-the-air (OTA) programming.
Rendexing is promoting assembled items on Tindie at $40; schematics and pattern YAML configurations can be found on GitHub beneath an unspecified license.