- Tiny footprint: Fits neatly on all Seeed Studio XIAO microcontroller boards. With a small lithium-ion battery sandwiched between the dev board and its hat, the logger is well fitting for space limited projects.
- Power supply enable: The GPIO-powered sensors allow almost a no-power sleep mode when the sensors are not used. The always-on RTC consumes less than 1 uA making it suitable for battery-powered data loggers.
- I2C communication: Easy to program from existing libraries and supports adding more sensors on the same bus possible.
- On-board RTC: The PCF8563 chip with its oscillator provides timekeeping, essential for long-term data loggers, and a programmable interrupt for deep sleep wakeups.
- Accurate Monitoring: The SHT40 temperature sensor presents temperature readings with 0.2°C accuracy and humidity with 1.8%RH. The PCF8563 real-time clock has shown a 7 minute time shift over one year compared to 10 hours from the ESP32’s internal RTC.
- Battery Voltage Monitoring: When connected with the lithium-ion battery, its status level can be safely monitored through a pin-enabled voltage divider.
A Community Design Scaled up by Fusion Co-Create
This cool creation is designed by Westlake University's Marcel. We're excited to work with him to bring this impactful design to the market via our Fusion Co-Create. It's a program where we applied the Fusion Prototype, Produce, and Promote services to scale up cool community projects, while the designers get a commission for each single piece sold.
Fully Open Source on GitHub
This product is fully open-sourced with schematics, layout, and Gerber files on GitHub, and Marcel will maintain all the firmware, software updates, and tech support over there too. We highly recommend you to follow the GitHub repo to stay updated.
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 | |
Battery | EEMB 3.7V Lithium Polymer Battery (500mAh) |
Compatibility with Seeed Studio XIAO
While Marcel has only tested the Seeed Studio XIAO ESP32C3, ESP32C6, and ESP32S3 boards (by now) with the XIAO Logger Hat, other XIAO boards should also work based on the pin configurations. XIAO SAMD21 and RP2040 don't support battery charging and should not use battery monitoring. XIAO RP2350, ESP32C6, RA4M1, and MG24 support battery charging but need additional wiring. XIAO nRF52840, ESP32C3, and ESP32S3 fully support battery monitoring with a simple 2-pin header connection.
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 |
- Real-time temperature and humidity monitoring
- Connected home automation node
- Low-power environmental data logger
- Wearable devices
- Programming and monitoring education
SHT40 temperature & humidity sensor datasheet
BH1750 ambient light sensor datasheet
XIAO Logger Hat project GitHub
XIAO Logger Hat board | x1 |
7-pin female header | x2 |
Note: Li-ion battery not included
| HSCODE | 9025900090 |
| USHSCODE | 9026104000 |
| UPC | |
| EUHSCODE | 9013101000 |
| COO | CHINA |
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