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

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

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SKU: Seeed-114993446
Sale price 11,95 €
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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 31 days of receiving your order.

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 (for US/Global) or Compensation for Loss of Value (for EU) from the refund amount.
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 soldered, permanently installed, or flashed with unauthorized firmware.

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

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

11,95 €

🧢 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 reliable shipping services with a tracking number for each order.
  • Shipping addresses must be entered in English and should not contain special symbols, so that the courier system can recognize your location correctly.
  • Please make sure your shipping address is accurate before placing your order. We ship strictly according to the address provided at checkout.
  • In-stock orders are usually dispatched within 1 business day after order confirmation.
  • Estimated delivery times refer to the period after dispatch and do not include order processing time, weekends, public holidays, customs inspection, or force majeure delays.
  • If you need to cancel or modify your order, please contact us before the order is marked as “Shipped”. Once shipped, the order cannot be canceled or changed.

🚀 Need Faster Shipping?

If you require expedited shipping, please contact our customer support team at info@openelab.io for a customized quote based on your destination.

2. Shipping Rates & Options

Shipping rates are calculated based on order value, destination, and available shipping methods. The final available options will be displayed at checkout.

2.1 Germany Domestic Shipping

Shipping Method Order Value Cost Est. Delivery
Deutsche Post €0.00 - €50.00 €4.95 2-4 Business Days
Deutsche Post Over €50.00 Free 2-4 Business Days
DHL Paket
(Faster Delivery)		 €0.00 - €50.00 €6.95 1-3 Business Days
DHL Paket
(Faster Delivery)		 €50.00 - €100.00 €2.00 1-3 Business Days
DHL Paket
(Faster Delivery)		 Over €100.00 Free 1-3 Business Days

2.2 Selected EU Countries / Regions

Available EU shipping destinations are shown at checkout based on your shipping address. For orders shipped to selected EU countries or regions outside Germany, we use FedEx Regional Economy.

Shipping Method Order Value Cost Est. Delivery
FedEx Regional Economy €0.00 - €100.00 €7.95 3-5 Business Days
FedEx Regional Economy Over €100.00 Free 3-5 Business Days

EU orders may be fulfilled from our Munich warehouse or, when applicable, from our Shenzhen warehouse depending on inventory availability. For EU member states, OpenELAB covers applicable import duties and taxes under DDP service where required.

2.3 United States

Region Shipping Method Order Value Cost Est. Delivery
Continental U.S.
(50 States)		 USPS Ground Advantage €0.00 - €45.00 €4.95 3-7 Business Days
USPS Ground Advantage Over €45.00 Free 3-7 Business Days
USPS Priority Mail €0.00 - €45.00 €16.95 1-4 Business Days
USPS Priority Mail Over €45.00 €14.95 1-4 Business Days
Non-Continental U.S.
(AK, HI, PR, etc.)		 USPS Ground Advantage €0.00 - €60.00 €6.95 5-9 Business Days
USPS Ground Advantage Over €60.00 Free 5-9 Business Days

Non-Continental U.S. regions include Alaska, American Samoa, Guam, Hawaii, the Marshall Islands, the Northern Mariana Islands, Palau, Puerto Rico, the U.S. Virgin Islands, and U.S. Armed Forces addresses.

2.4 International Destinations Outside the EU

For selected international destinations outside the EU, including Switzerland, the United Kingdom, and Norway, shipping rates are as follows:

Order Amount Shipping Cost
€0.00 - €300.00 €19.95
Over €300.00 Free

For non-EU destinations, import duties, taxes, and customs fees may be charged by the destination country and are the responsibility of the recipient.

3. Warehouses & Fulfillment

Our products may be stored in our Munich, Arlington, and Shenzhen warehouses. The actual shipping warehouse depends on product availability and destination.

3.1 Munich Warehouse

For products stored in our Munich warehouse, we use Deutsche Post or DHL Paket for domestic deliveries within Germany. For selected EU destinations outside Germany, we use FedEx Regional Economy.

3.2 Arlington Warehouse

For products stored in our Arlington warehouse, we use USPS or UPS for deliveries within the United States.

3.3 Shenzhen Warehouse

For pre-order items or products fulfilled directly from our Shenzhen warehouse, we arrange reliable international shipping based on destination and inventory status. For EU member states, OpenELAB covers applicable import duties and taxes under DDP service where required.

4. Inventory, Pre-orders & Split Shipments

  • Inventory Status: Please check the product page for real-time stock information. If an item is out of stock in our local warehouses, it may be marked as “Pre-order”.
  • Pre-order Fulfillment: Pre-order items may be shipped directly from Shenzhen or restocked to a local warehouse first before final delivery.
  • Split Shipments: If your order contains both in-stock and pre-order items, we may ship them separately. No additional shipping fee will be charged for split shipments caused by our fulfillment arrangement.

5. Customs, Taxes & Delivery Issues

5.1 Customs and Taxes

For EU Member States:
Whether shipped from Germany or China, OpenELAB covers applicable import duties and taxes under DDP service where required. Customers in EU member states should not be charged additional import duties or VAT upon delivery.

Important Notice for Non-EU Countries:
For destinations outside the European Union, such as Switzerland, Norway, and the United Kingdom, import duties, taxes, and customs fees may be charged by local authorities upon delivery. These fees are the responsibility of the recipient.

5.2 Damaged, Delayed, or Lost Parcels

Please inspect your parcel upon delivery where possible. If you notice visible damage, please report it to the courier and contact us as soon as possible. This does not affect your statutory consumer rights.

If your parcel is delayed, lost, returned to sender, or the tracking information has not updated for an unusual period of time, please contact us at info@openelab.io. We will assist you in checking the shipment status with the courier.

5.3 Incorrect Address or Failed Delivery

If a parcel cannot be delivered due to an incorrect or incomplete address provided by the customer, refusal of delivery, or failure to collect the parcel, additional shipping or return costs may apply.

6. VAT

For orders within the EU, VAT is collected at checkout according to the applicable destination rules. No additional VAT should be collected upon delivery for EU member state orders covered under our DDP shipping arrangement.