Home Seeed Studio XIAO Logger HAT for XIAO with RTC & Battery Monitor

Seeed Studio XIAO Logger HAT for XIAO with RTC & Battery Monitor

Sale price $14.09
SKU: Seeed-114993446

📦 Location of the warehouse: China

Add to Wishlist Add to Compare

Free Shipping from $50 in the US, $70 for non-continental US

- US Delivery Time: 2~7 Business days.

- Non-Continental US Delivery Time: 3~9 working days.

Ask a question

Guarantee & Return Policy

Effective Date: December 10, 2025

At OpenELAB, we are committed to providing accurate product descriptions and high-quality electronics. The following policy outlines your rights and obligations, designed to be fair to both our customers and our business operations globally.

1. Warranty Policy

A. Standard Limited Warranty (Global & US)

For customers in the United States, Asia, and other non-EU regions:

  • Warranty Period: OpenELAB provides a 12-month warranty from the date of delivery.

  • Coverage: This warranty covers defects in material and workmanship under normal use.

  • Resolution: We will repair or replace defective units at no charge.

B. Statutory Rights for EU/UK Customers (EU Compliance)

If you are a consumer residing in the European Union or the UK purchasing from our global site:

  • Statutory Guarantee: You are entitled to a 24-month statutory guarantee for conformity defects present at the time of delivery, in accordance with EU consumer protection laws.

  • Relation: The Standard Limited Warranty (Section 1.A) applies in addition to, and does not replace, your statutory rights.

C. Warranty Exclusions (Applies to ALL Regions)

Warranty coverage is VOID if the damage is caused by:

  1. Misuse: Incorrect installation, reverse polarity, or exceeding voltage limits.

  2. Unauthorized Modification: This explicitly includes soldering, cutting pins, modifying the PCB, or flashing unauthorized/beta firmware that "bricks" the device.

  3. Physical Damage: Drops, moisture/water damage, or electrical surges (lightning).

  4. Normal Wear & Tear: Consumable parts (e.g., batteries), unless defective upon arrival.

Note: For non-warranty repairs (e.g., customer-induced damage), we may offer repair services for a fee. Shipping and diagnostic costs will be borne by the customer.

2. Return & Refund Policy

A. Return Window

  • Standard: You may request a return within 30 days of receiving your order.

  • EU Customers: You have the statutory right to withdraw from the contract within 14 days of receipt without giving a reason.

B. Refund Conditions & Restocking Fees

To protect against policy abuse, the refund amount is strictly determined by the condition of the returned item.

1. Full Refund (100%)

  • The item is Brand New, Unopened, and Unused.

  • The original packaging is intact and sealed.

  • All accessories are present.

2. Partial Refund (Restocking Fee / Value Depreciation)
If the item is returned in a condition that prevents it from being sold as new, OpenELAB reserves the right to deduct a Restocking Fee (or "Compensation for Loss of Value" for EU customers) from the refund.
Deductions apply if:

  • Signs of Use: Visible scratches, mounting marks on screw holes, or fingerprints.

  • Damaged Packaging: Original box is torn, written on, or missing.

  • Technical Modification: The device has been powered on, programmed/flashed, or soldered.

  • Broken Seals: Anti-static bags or security seals have been opened.

Depending on the severity of the usage/damage, the deduction may range from 15% to 50% of the product price. Items damaged beyond repair due to misuse will not be refunded.

C. Shipping Costs

  • Defective / Wrong Item: OpenELAB covers the return shipping cost.

  • Customer Remorse (Changed Mind / Ordered Wrong Item): The customer is responsible for all return shipping costs to our designated return center (located in the US, Germany, or China, depending on your region). Original shipping fees are non-refundable unless required by local law.

3. Return Process (RMA)

To ensure a smooth return process, please follow these steps:

  1. Authorization: Contact us at info@openelab.io before returning any item. Returns without prior authorization will not be accepted.

  2. RMA Number: We will provide you with a Return Merchandise Authorization (RMA) number and the correct return address.

  3. Packing: Ship the item back in its original packaging with the RMA number clearly marked on the shipping label (not on the product box).

  4. Tracking: We strongly recommend using a trackable shipping method. OpenELAB is not responsible for returns lost in transit.
Share

- 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.

Visa
PayPal
Mastercard
American Express
Shop Pay
Seeed Studio XIAO Logger HAT for XIAO with RTC & Battery Monitor

Seeed Studio XIAO Logger HAT for XIAO with RTC & Battery Monitor

$14.09

🧢 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

1. General Shipping Information

  • We provide premium shipping methods with a tracking number for each order.
  • Shipping address should be input in English without any special symbols to help the courier company recognize your address in the system. We will ship according to the shipping address you provided. Please notify us of any address change before your order is marked "Shipped" to avoid parcel loss.
  • Please contact our customer service staff immediately if you need to cancel or change an order. Once your order has reached "Shipped" status, it can no longer be canceled or changed in any way. To avoid complications, please recheck your shopping cart before checkout.
  • We can ship all in-stock orders within 1 business day as your order has been confirmed.
  • All items are inspected before dispatch and are carefully hand-packed.
  • With standard courier practice, you need to check the contents of the parcel before signing for your goods. Otherwise, we will not be held responsible for any damage that may have occurred in transit.

 

2. Shipping Options & Rates (United States)

(For Products in the US Warehouse & Global Warehouse)

2.1 Continental U.S. (50 States)

Shipping Method Order Value Cost Est. Delivery
USPS Ground Advantage $0.00 - $5.00 $9.99 3-7 Business Days
USPS Ground Advantage $5.00 - $50.00 $5.99 3-7 Business Days
USPS Ground Advantage Over $50.00 Free 3-7 Business Days
USPS Priority Mail
(Faster Option)		 $0.00 - $50.00 $19.99 1-4 Business Days
USPS Priority Mail Over $50.00 $17.59 1-4 Business Days

  

2.2 Non-Continental U.S.

(Includes Alaska, Hawaii, Puerto Rico, Guam, Virgin Islands, etc.)

Shipping Method Order Value Cost Est. Delivery
USPS Ground Advantage $0.00 - $5.00 $9.99 5-9 Business Days
USPS Ground Advantage $5.00 - $70.00 $7.99 5-9 Business Days
USPS Ground Advantage Over $70.00 Free 5-9 Business Days

 

Important Notice:

  • Before placing your order, please check the inventory location on the product page to confirm the delivery timeframes.
  • For products stored in the Global Warehouse (Shenzhen), we will ship them directly from China.
  • If you place an order for products from both the U.S. warehouse and the Global warehouse, we will ship your order separately: the products from the Global warehouse will be sent from China, and the products from the U.S. warehouse will be sent from the U.S. warehouse.

   

3. Warehouse Locations

Our products are stored in both our U.S. and Global warehouses to provide more flexible logistics solutions. On each product's description page, we indicate the specific warehouse location.

3.1 U.S. Warehouse

Located in Dover, Delaware (19901).
For products stored here, we use USPS for shipping. Logistics within U.S. are very efficient, with an estimated delivery time of 3-7 business days.

3.2 Global Warehouse (China)

Located in Shenzhen, Guangdong.
For orders shipping from our Global Warehouse, we typically use YunExpress. Given the complexities of international shipping, the estimated delivery time is around 10 business days, though this may vary due to customs processes.

To ensure that your order is delivered within your desired timeframe, we recommend reviewing the warehouse information provided on the product pages before placing your order.   

 

4. Customs and Taxes

Effective Date: December 10, 2025

At OpenELAB, we are committed to providing accurate product descriptions and high-quality electronics. The following policy outlines your rights and obligations, designed to be fair to both our customers and our business operations globally.

1. Warranty Policy

A. Standard Limited Warranty (Global & US)

For customers in the United States, Asia, and other non-EU regions:

  • Warranty Period: OpenELAB provides a 12-month warranty from the date of delivery.

  • Coverage: This warranty covers defects in material and workmanship under normal use.

  • Resolution: We will repair or replace defective units at no charge.

B. Statutory Rights for EU/UK Customers (EU Compliance)

If you are a consumer residing in the European Union or the UK purchasing from our global site:

  • Statutory Guarantee: You are entitled to a 24-month statutory guarantee for conformity defects present at the time of delivery, in accordance with EU consumer protection laws.

  • Relation: The Standard Limited Warranty (Section 1.A) applies in addition to, and does not replace, your statutory rights.

C. Warranty Exclusions (Applies to ALL Regions)

Warranty coverage is VOID if the damage is caused by:

  1. Misuse: Incorrect installation, reverse polarity, or exceeding voltage limits.

  2. Unauthorized Modification: This explicitly includes soldering, cutting pins, modifying the PCB, or flashing unauthorized/beta firmware that "bricks" the device.

  3. Physical Damage: Drops, moisture/water damage, or electrical surges (lightning).

  4. Normal Wear & Tear: Consumable parts (e.g., batteries), unless defective upon arrival.

Note: For non-warranty repairs (e.g., customer-induced damage), we may offer repair services for a fee. Shipping and diagnostic costs will be borne by the customer.

2. Return & Refund Policy

A. Return Window

  • Standard: You may request a return within 30 days of receiving your order.

  • EU Customers: You have the statutory right to withdraw from the contract within 14 days of receipt without giving a reason.

B. Refund Conditions & Restocking Fees

To protect against policy abuse, the refund amount is strictly determined by the condition of the returned item.

1. Full Refund (100%)

  • The item is Brand New, Unopened, and Unused.

  • The original packaging is intact and sealed.

  • All accessories are present.

2. Partial Refund (Restocking Fee / Value Depreciation)
If the item is returned in a condition that prevents it from being sold as new, OpenELAB reserves the right to deduct a Restocking Fee (or "Compensation for Loss of Value" for EU customers) from the refund.
Deductions apply if:

  • Signs of Use: Visible scratches, mounting marks on screw holes, or fingerprints.

  • Damaged Packaging: Original box is torn, written on, or missing.

  • Technical Modification: The device has been powered on, programmed/flashed, or soldered.

  • Broken Seals: Anti-static bags or security seals have been opened.

Depending on the severity of the usage/damage, the deduction may range from 15% to 50% of the product price. Items damaged beyond repair due to misuse will not be refunded.

C. Shipping Costs

  • Defective / Wrong Item: OpenELAB covers the return shipping cost.

  • Customer Remorse (Changed Mind / Ordered Wrong Item): The customer is responsible for all return shipping costs to our designated return center (located in the US, Germany, or China, depending on your region). Original shipping fees are non-refundable unless required by local law.

3. Return Process (RMA)

To ensure a smooth return process, please follow these steps:

  1. Authorization: Contact us at info@openelab.io before returning any item. Returns without prior authorization will not be accepted.

  2. RMA Number: We will provide you with a Return Merchandise Authorization (RMA) number and the correct return address.

  3. Packing: Ship the item back in its original packaging with the RMA number clearly marked on the shipping label (not on the product box).

  4. Tracking: We strongly recommend using a trackable shipping method. OpenELAB is not responsible for returns lost in transit.