Seeed Studio XIAO Logger HAT for XIAO with RTC & Battery Monitor
Seeed Studio XIAO Logger HAT for XIAO with RTC & Battery Monitor
Shipping & Delivery Information
🚚 In-Stock Items: Orders for in-stock products are shipped within 24 hours after the order is placed.
📦 Pre-order Items: If a product is marked as "Pre-order", it means it is currently out of stock. We'll dispatch your order once we have restocked, usually within 10 working days. For special pre-sale items, the expected arrival date will be noted in the product description.
✈️ Express Shipping: Need your order urgently? Please contact us via email or live chat, and we’ll help arrange express delivery for you.
🧢 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 |
|
|
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
- Pre-Ordering: If an item is unavailable, you can pre-order it. We'll dispatch once stock is replenished, usually within 10 working days. Special pre-sale products will specify the expected arrival time in the description.
- Express Shipping: Need it faster? Contact us via email or through our live chat support, and we'll arrange expedited delivery for you.
1. General Shipping Information
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We can ship all in-stock orders within 1 business day as your order has been confirmed.
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All items are inspected before dispatch and are carefully hand-packed.
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(For Products in Munich Warehouse, Long Beach Warehouse)
2.1 Shipping options for an order value of up to €30 inside Germany, €50 inside the EU* or €45 in the U.S.:
Shipping Options:
| Shipping Options | Germany | EU* |
|---|---|---|
|
Deutsche Post |
€3.5 Arrive in 3-4 Business Days |
€6 Arrive in 5-9 Business Days |
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DHL Paket |
€6 Arrive in 2-3 Business Days |
€15 Arrive in 3-7 Business Days |
|
DHL Express |
€14 Arrive in 1-2 Business Day |
€65 Arrive in 2-3 Business Days |
| Shipping Options | Continental U.S. | Non-Continental U.S. |
|---|---|---|
|
USPS Ground Advantage |
€4.95 Arrive in 3-7 Business Days |
€6.95 Arrive in 5-9 Business Days |
|
UPS Express |
€11.95 Arrive in 2-4 Business Days |
€13.95 Arrive in 3-7 Business Days |
2.2 Free shipping options for an order value of above €30 inside Germany, €50 inside the EU* or €45 in US :
| Free Shipping Options | Germany | EU* |
|---|---|---|
|
Deutsche Post |
Free Above €30 | Free Above €50 |
|
DHL Paket |
+ €2 for Above €30 / Free Above €60 | + €8 for Above €50 / Free Above €80 |
|
DHL Express |
+ €10 for Above €30 | + €60 for Above €50 |
| Free Shipping Options | Continental U.S. | Non-Continental U.S. |
|---|---|---|
|
USPS Ground Advantage |
Free above €45 | Free above €60 |
|
UPS Express |
+ € 8.95 for Above €45 | + € 11.95 for Above €45 |
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Certain EU Countries are not included in our EU Zone definition: United Kingdom (excluding Ireland), Switzerland, Liechtenstein, Vatican City, Albania, Belarus, Norway, Ukraine, and Iceland. For the above countries, the International Shipping Rule applies.
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2.3 Shipping Options for International Countries:
(via Deutsche Post or YunExpress)
| Order Amount | International |
|---|---|
| €0 - €15 | €8 |
| €15 - €30 | €7 |
| €30 - €50 | €6 |
| €50 and above | €4 |
Important Notice:
- Please verify the inventory location on the product page before placing your order to confirm delivery timeframes.
- For products in the Shenzhen warehouse, we will typically first ship the products from the Shenzhen warehouse to our Munich warehouse or Long Beach warehouse, which will take around 1.5 weeks. After we receive the shipment in Munich/ Long Beach, we will send the items to you. We will only arrange YunExpress shipping from Shenzhen for orders with products in the Shenzhen warehouse worth more than €50.
- If you place an order with products from both Munich and Shenzhen warehouses, we will first ship the products in the Munich warehouse, and then send the remaining products to you when we receive them from Shenzhen.
3. International Warehouse
3.1 German Warehouse
3.2 US Warehouse
3.3 Chinese Warehouse
4. Customs and Taxes
4.1 How are customs handled by OpenELAB for import or export?
4.2 How is VAT charged when the Customer places an order from OpenELAB?
4.3 What kind of fee will be charged except VAT?
Effective Date: August 7, 2025
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Warranty Period
The standard warranty period for products sold by OpenELAB is 12 months from the date of delivery.
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