Pseudonymous maker “LeanMCU” has launched open supply firmware and a friction-fit enclosure designed to transform low-cost Espressif ESP32-C3 improvement boards and TE Connectivity HTU21D environmental sensor breakouts into compact, related temperature and humidity screens for Residence Assistant.
“I wished a fleet of low cost, dependable temperature and humidity sensors round the home, so I designed this sensor utilizing an [Espressif] ESP32-C3[-based] Tremendous Mini [development board] and a [TE Connectivity] HTU21D module, written utilizing the Arduino ESP32 core. Whole price per unit from AliExpress is underneath $10. Be aware on the sensor: When ordering from different AliExpress distributors, simply double-check consumer evaluations to make sure persons are receiving true HTU21D chips moderately than mislabeled clones!”
The {hardware} for the venture is fully off-the-shelf, comprising an affordable improvement board constructed round Espressif’s low-cost ESP32-C3 wi-fi system-on-chip — providing one 32-bit core operating at as much as 160MHz, single-band Wi-Fi, and Bluetooth 5 Low Vitality (BLE) connectivity. That is linked to a TE HTU21D, which offers temperature and humidity sensing fed right into a customized firmware that may clean the readings earlier than transmitting them to Residence Assistant for recording and show. The whole lot is housed in a friction-fit 3D-printed case, to maintain issues neat.
“To avoid wasting individuals from putting in toolchains,” LeanMCU explains of what makes the venture stand out from the remainder, “I arrange a GitHub internet installer. You’ll be able to flash the pre-compiled Arduino firmware instantly out of your browser over Internet Serial. It features a captive portal to configure Wi-Fi, Residence Assistant, and ThingSpeak.”
The supply code and enclosure 3D-print information can be found on GitHub underneath the reciprocal GNU Normal Public License 2; extra info is out there in LeanMCU’s Reddit submit.
