Product description: Xiao Logger HAT - expansion module with RTC and environmental sensors for Seeed Xiao - Seeedstudio 114993446
Xiao Logger HAT is a compact expansion module designed specifically for Seeed Xiao boards. Equipped with a Sensirion SHT40 temperature and humidity sensor, a BH1750 light intensity sensor and a PCF8563 real-time clock , it enables precise environmental monitoring. Additionally, thanks to the built-in voltage divider, it allows for monitoring the battery status. The module communicates via the I2C interface, which makes it easy to integrate with existing projects. Thanks to its small dimensions (21 x 17.8 mm), it is perfect for applications with limited space , such as mobile devices or remote measurement stations.
Xiao Logger HAT - expansion module with RTC and environmental sensors for Seeed Xiao - Seeedstudio 114993446.
The module includes a temperature and humidity sensor, an ambient light sensor and a real-time clock.
Main features of the module
- RTC PCF8563 : real time clock with programmable wake-up and minimal current consumption
- SHT40 temperature and humidity sensor : high precision (±0.2°C / ±1.8%RH)
- BH1750 light sensor : measuring the ambient light intensity
- Battery power support : battery voltage monitoring via built-in voltage divider
- Energy efficiency : sleep mode current consumption < 1 µA, ability to disable sensors via GPIO
- I2C communication : easy connection and integration with Arduino IDE / MicroPython libraries
- Full hardware openness : access to schematics, PCB files and software on GitHub
Arrangement of components on the board
The Xiao Logger HAT board includes:
- PCF8563 : RTC chip for accurate timekeeping
- SHT40 : Digital Temperature and Humidity Sensor
- BH1750 : Digital Ambient Light Sensor
Additionally:
- Voltage divider : allows reading the battery voltage via the ADC pin
- Crystal oscillator : ensures RTC precision
- Female connectors : for mounting directly on Seeed Xiao boards
Arrangement of components on the board.
The board has clear descriptions to facilitate work.
Connection and Compatibility
The module works with many Seeed Xiao boards via I2C bus. The default pins are D4 (SDA) and D5 (SCL) . Additional lines include:
- EN - sensor power supply (e.g. GPIO D10)
- BAT - battery voltage reading (e.g. A3)
- INT - wake up from sleep by RTC
The module is fully compatible with: Xiao ESP32-C3 / ESP32-S3 / ESP32-C6 / nRF52840 (Sense) / RP2350 / RA4M1 / MG24 (with additional wiring). Limited compatibility with Xiao SAMD21 and RP2040 (no battery monitoring support).
Practical applications
The module will be useful in a range of IoT applications, such as weather stations, environmental loggers, mobile devices, home automation systems and educational projects . Its small size makes it a perfect fit for enclosures with limited space.
Xiao Logger HAT Technical Specification
- Communication: I2C
- Supply voltage range: 2.4 V to 3.6 V
- Active current consumption: ~ 500 µA
- Current consumption in sleep mode: ~ 0.25 µA
- Temperature and humidity sensor: SHT40
- Light intensity sensor: BH1750
- RTC: PCF8563
- Battery voltage reading: via voltage divider
- SHT40 reading time: ~2ms
- BH1750 read time: ~120ms
- Operating temperature range: -40°C to 85°C
- Dimensions: 21mm x 17.8mm
Kit Contents
- 1x Xiao Logger HAT Module
- 2x Female goldpin header (7-pin)
Items included in the set.
