This compact add-on hat for the XIAO series packs a punch with multiple smart features: SHT40 temperature & humidity sensor – for precise environmental readings BH1750 ambient light sensor – to measure brightness levels PCF8563 real-time clock – ensures accurate timekeeping Voltage divider – lets you monitor battery voltage with ease Feature Tiny Footprint Fits snugly on all Seeed Studio XIAO boards! With a slim lithium-ion battery tucked between the dev board and its hat, this logger is perfect for space-constrained projects. Power Supply Enable Sensors are GPIO-powered, allowing near-zero power sleep mode when idle. The always-on RTC sips less than 1 µA, making it ideal for battery-powered data loggers. I2C Communication Easy to code using existing libraries, and supports adding more sensors on the same bus. On-board RTC The PCF8563 chip keeps time reliably and includes a programmable interrupt for deep sleep wakeups—essential for long-term logging. Accurate Monitoring SHT40 sensor: ±0.2°C temperature, ±1.8%RH humidity PCF8563 RTC: Only ~7 minutes drift per year vs. 10 hours from ESP32’s internal RTC Battery Voltage Monitoring Track battery status safely via a pin-enabled voltage divider. Perfect for mobile and remote deployments. A Community Design Scaled Up by Fusion Co-Create This awesome module was designed by Westlake University's Marcel. Through Fusion Co-Create, we helped scale his idea using our Prototype → Produce → Promote pipeline. Marcel earns a commission for every unit sold—win-win! Fully Open Source on GitHub Schematics, layout, Gerber files—all open! Marcel also maintains firmware, updates, and tech support via GitHub. We highly recommend following the repo to stay in the loop. Specification Size 21 x 17.8 mm Operating Temperature -40°C to 85°C Power Supply Range 2.4V ~ 3.6V Current consumption ~ 500uA Idle current consumption ~ 0.25uA Communication Interface I2C ● SHT40 Temperature & Humidity Sensor ● BH1750 Ambient Light Sensor ● PCF8563 Real-Time Clock ADC ● Battery Voltage Read SHT40 temperature & humidity sensor read time ~ 2ms BH1750 ambient light sensor read time ~ 120ms Compatible Hardware Platforms ● Seeed Studio XIAO Battery EEMB 3.7V Lithium Polymer Battery (500mAh) Compatibility with Seeed Studio XIAO Boards Marcel has tested the Logger Hat with: XIAO ESP32C3 XIAO ESP32C6 XIAO ESP32S3 Other XIAO boards should also work based on pin configurations, but here’s the breakdown: Board Model Battery Charging Battery Monitoring Notes XIAO SAMD21 Not supported Not recommended No battery charging support XIAO RP2040 Not supported Not recommended Same as above XIAO RP2350 Supported Needs extra wiring Manual setup required XIAO ESP32C6 Supported Simple 2-pin header Fully compatible XIAO RA4M1 Supported Needs extra wiring Manual setup required XIAO MG24 Supported Needs extra wiring Manual setup required XIAO nRF52840 Supported Simple 2-pin header Fully compatible XIAO ESP32C3 Supported Simple 2-pin header Fully compatible XIAO ESP32S3 Supported Simple 2-pin header Fully compatible For boards that require extra wiring, make sure to consult the schematics before enabling battery monitoring. XIAO Boards I2C INT ADC EN BAT XIAO SAMD21 yes yes yes yes no XIAO nRF52840 (Sense) yes yes yes yes yes XIAO RP2040 yes yes yes yes no XIAO RP2350 yes yes yes yes yes but not aligned XIAO ESP32C3 yes yes yes yes yes XIAO ESP32S3 (Sense) yes yes yes yes yes XIAO ESP32C6 yes yes yes yes yes but not aligned XIAO RA4M1 yes yes yes yes yes but not aligned XIAO MG24 (Sense) yes yes yes yes yes but not aligned Hardware Overview Application Real-Time Environmental Monitoring Track temperature and humidity with precision—perfect for smart sensing projects. Connected Home Automation Node Integrate into your smart home setup for responsive, data-driven control. Low-Power Data Logger Ideal for long-term deployments with minimal energy usage. Wearable Tech Projects Compact enough for wearables—log environmental data on the go. Education in Programming & Monitoring Great for learning I2C, sensor integration, and low-power design in classrooms or maker labs. Part List XIAO Logger Hat board x1 7-pin female header x2 Note: Li-ion battery not included
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