M5Stack Stopwatch Dev Kit (ESP32-S3)
Need a larger quantity?
Need bulk pricing?
Get a formal quotation with lead time and volume pricing.
For universities, companies, distributors, and project orders.
M5Stack Stopwatch Dev Kit (ESP32-S3)
Description
The M5Stack Stopwatch Dev Kit is a compact round ESP32-S3 development kit for portable interfaces, smart badges, wearable-style prototypes and lightweight IoT terminals. It combines an ESP32-S3R8 controller, 16MB Flash, 8MB PSRAM, a 1.75-inch 466 x 466 AMOLED touch display, Wi-Fi, battery operation, audio, motion sensing and expansion interfaces in a handheld form factor.
Unlike a bare controller board, the M5Stack Stopwatch Dev Kit gives developers a finished interaction platform with touch input, two programmable buttons, a power button, vibration feedback, MEMS microphone, speaker amplifier path, RTC and IMU. That makes the M5Stack Stopwatch Dev Kit useful for UI-heavy prototypes where the enclosure, screen, power system and feedback hardware should already be integrated.
The official documentation also exposes pin maps, model-size files, datasheets, Arduino examples, UiFlow2 quick-start material and ESP-IDF demo repositories. For teams building portable control panels or connected display devices, this kit shortens early hardware evaluation while keeping access to M5Stack's familiar software stack.
Features
- ESP32-S3R8 platform: dual-core Xtensa LX7 controller up to 240MHz with 16MB Flash and 8MB PSRAM.
- Round AMOLED touch UI: 1.75-inch 466 x 466 AMOLED display with CST820B touch controller.
- Portable interaction hardware: two programmable buttons, one power button, vibration motor and lanyard hole.
- Audio and sensing: ES8311 codec, MEMS microphone, AW8737A amplifier, BMI270 IMU and RX8130CE RTC.
- Expansion-ready design: HY2.0-4P expansion interface plus rear 2.54mm expansion bus.
- Power management: M5PM1 multi-level power management with built-in 450mAh battery and USB Type-C 5V input.
- Development resources: official docs, model-size PDF, Arduino libraries, UiFlow2 support and ESP-IDF demos.
Specifications
| Product name | M5Stack Stopwatch Dev Kit (ESP32-S3) |
|---|---|
| SKU | M5-C152 |
| Main controller | ESP32-S3R8 dual-core Xtensa LX7, up to 240MHz |
| Memory | 16MB Flash, 8MB PSRAM |
| Wireless | 2.4GHz Wi-Fi |
| Display | 1.75-inch AMOLED round touch display, 466 x 466 resolution, CO5300 driver, QSPI interface |
| Touch controller | CST820B |
| Buttons | 2 x programmable buttons, 1 x power button |
| Haptics | Built-in vibration motor |
| Audio | ES8311 audio codec, MEMS microphone, AW8737A amplifier |
| Sensors and RTC | BMI270 IMU, RX8130CE RTC |
| Expansion | HY2.0-4P, rear expansion bus 2.54-7P and 2.54-6P |
| Power management | M5PM1 multi-level power management |
| Battery | 450mAh built-in battery |
| Input power | USB Type-C DC 5V |
| Product size | 52.0 x 52.0 x 15.5mm |
| Product weight | 39.0g |
| Package size | 70.0 x 70.0 x 23.6mm |
| Gross weight | 49.5g |
Applications
- Portable smart device prototypes with a round touch display.
- Electronic badge, wearable-style interface and compact dashboard projects.
- Lightweight IoT terminals that need Wi-Fi, battery power and local feedback.
- Touch-based control panels for demos, education and rapid UI validation.
- ESP32-S3 audio, IMU, RTC and power-management development experiments.
Product List
Package content: 1 x StopWatch development kit.

Other Content
Hardware overview: the official detail images show the round AMOLED front, the compact side profile, the rear PCB area and the rear expansion layout.




Mechanical and weight reference: the model-size and weight images help customers confirm installation space, wearable-style mounting and package planning before choosing the M5Stack Stopwatch Dev Kit.


Usage notes: M5Stack documents development notes and software resources for Arduino, UiFlow2 and ESP-IDF workflows. The M5Stack Stopwatch Dev Kit is best selected when a project needs a finished round touch interface rather than a minimal headless ESP32-S3 controller.

Important search terms for this product include M5Stack StopWatch, ESP32-S3 development kit, round AMOLED touch display, portable IoT terminal, wearable interface prototype, ESP32-S3 touch board, M5Stack C152 and battery powered ESP32-S3 kit.
Resources
- Official M5Stack StopWatch documentation
- M5Stack StopWatch PDF documentation
- StopWatch model size PDF
- StopWatch factory firmware GitHub
- StopWatch low-power test example
- M5Unified driver library
- M5GFX display library
- M5PM1 power management library
- M5IOE1 IO expansion library
For a practical buying and project overview, read the same-site M5Stack StopWatch hands-on guide.
FAQ
What is the M5Stack Stopwatch Dev Kit used for?
It is used for portable ESP32-S3 projects that need a round AMOLED touch display, buttons, audio, IMU, RTC, vibration feedback and battery power in one compact kit.
Does it include a battery?
Yes. The official specification lists a built-in 450mAh battery with M5PM1 multi-level power management.
Which display does it use?
It uses a 1.75-inch round AMOLED touch display with 466 x 466 resolution and a CO5300 display driver.
Can I develop with Arduino or UiFlow2?
Yes. M5Stack provides Arduino, UiFlow2 and ESP-IDF resources for StopWatch development.
What is included in the package?
The official package list includes one StopWatch development kit.
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@upenelab.com 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.
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@upenelab.com. 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.








