Seeed Studio XIAO Logger HAT – A Tiny Temperature, Humidity and Light Add-On Module for XIAO With RTC and Battery Voltage Monitoring

The Seeed Studio XIAO Logger HAT is a compact environmental sensing add-on designed for Seeed Studio XIAO boards. It integrates SHT40 temperature & humidity sensing, BH1750 ambient light measurement, and a PCF8563 real-time clock for accurate, low-power data logging. Built for battery-powered applications, it supports battery voltage monitoring via an ADC pin and ultra-low idle current for long-term deployments.

The always-on RTC enables precise timestamping and deep-sleep wakeups, making it ideal for portable loggers and IoT nodes. Using an I2C interface, the Logger HAT is easy to program and expandable with additional sensors. Its tiny footprint fits neatly with XIAO boards, ensuring reliable performance in space-constrained projects.

Features:

1. Ultra-compact HAT for all Seeed Studio XIAO boards
2. On-board SHT40 temperature & humidity sensor
3. BH1750 digital ambient light sensor
4. PCF8563 low-power real-time clock with interrupt
5. Battery voltage monitoring via ADC
6. Ultra-low idle current (~0.25 µA)
7. I2C interface for easy expansion

Package Includes:

1 x Seeed Studio XIAO Logger HAT

2 x 7-pin female header

6 Months Warranty

This item is covered with a supplier warranty of 6 months from the time of delivery against manufacturing defects only. This is a quality product from the original manufacturer. Only manufacturing defects are covered under this warranty. Replacement will be done against manufacturing defects.

What voids the warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.