M5Stack Voltage and Amperage Meter with M5StampS3
📦 Location of the warehouse: China
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.
- 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.
M5Stack Voltage and Amperage Meter with M5StampS3
⚡ M5Stack Voltage and Amperage Meter with M5StampS3
The M5Stack Voltage and Amperage Meter (VAMeter) is a compact, high‑accuracy digital multimeter module designed for IoT system integration and embedded projects. Built around the advanced ESP32‑S3 MCU (M5StampS3), it delivers precise DC voltage and current readings, making it perfect for power monitoring, diagnostics, and smart analytics in real time.
With Wi‑Fi and Bluetooth connectivity, developers can remotely acquire and analyze electrical data, integrate with cloud platforms, or build custom dashboards. Its plug‑and‑play design ensures seamless compatibility with the M5Stack ecosystem, enabling rapid prototyping and deployment.
🔑Features
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Precision measurement of DC voltage and current
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ESP32‑S3 MCU core via M5StampS3
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Wireless connectivity: Wi‑Fi + Bluetooth 🌐
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Plug‑and‑play integration with M5Stack ecosystem
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Wide measurement range: 6V–36V, up to 5A
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Compact design for easy embedding into systems
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User interaction: rotary encoder, reset button, boot button
📦 What’s in the Box
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1 × M5Stack Voltage and Amperage Meter Module (with M5StampS3)
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1 × GROVE connection cable
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1 × Screw terminal
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1 × Quick start manual
🎯 Applications
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Smart device & appliance energy monitoring
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IoT‑based remote metering & diagnostics
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Industrial equipment testing ⚙️
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DIY electronics & maker projects
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Battery management & solar power systems ☀️
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Edge intelligence prototyping
📐 Specifications
| Resource | Parameter |
|---|---|
| Detection Chip | INA226 (dual, I2C addresses 0x40/0x41) |
| SoC | ESP32S3FN8, Xtensa® 32‑bit LX7 dual‑core @ 240MHz |
| Flash | 8MB |
| Wi‑Fi | IEEE 802.11 b/g/n (2.4GHz) |
| Screen | 1.3‑inch TFT LCD, 240×240 pixels, ST7789 driver |
| PD Input/Output Power | 5–24V @ 0–5A |
| Current Resolution | 2.5µA / 250µA |
| Sampling Error | 1.01% (1–100mA), 0.94% (100mA–5A), 0.69% (µA‑level) |
| Relay | DC 5–24V @ 5A |
| Power Consumption | USB 5V/123.5mA; PD input: 5V/118mA, 12V/66.8mA, 24V/26mA |
| PD Output Capability | DC24V/3A (68℃), DC24V/5A (92℃) |
| Operating Temp. | 0–40℃ |
| Product Size | VAMeter: 36×36×14.7mm / 36×36×20.3mm; Rail fastening: 51.5×48×5.5mm |
| Package Size | 150×93×30mm |
| Weight | VAMeter: 17.7g; Base: 25.8g; Rail fastening: 4g; Package: 68.1g |
| Case Material | Plastic (PC) |
❓ FAQ
Q: What voltage/current range can this meter handle? A: DC voltage 6V–36V, current up to 5A.
Q: Is it programmable? A: Yes — supports Arduino IDE, MicroPython, ESP‑IDF.
Q: How does data transmission work? A: Wirelessly via Wi‑Fi/Bluetooth, or through UART output.
Q: Can I use this for industrial projects? A: Absolutely — suitable for both educational and industrial IoT scenarios.
Q: Is it plug‑and‑play with M5Stack products? A: Yes — fully compatible with the M5Stack ecosystem and GROVE connections.
💡 Why Choose This Meter?
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Accurate readings + wireless data at your fingertips
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Easy coding with mainstream development platforms
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Build and monitor smart projects faster and smarter
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💡 Tips – Entering Download Mode
To enter Download Mode on the M5Stack Voltage and Amperage Meter (VAMeter):
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Press and hold the G0 button on the VAMeter.
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Power up the device while keeping the button pressed.
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Release the G0 button after powering up.
Schematics
1. General Shipping Information
- We provide premium shipping methods with a tracking number for each order.
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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.
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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.
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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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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 for Orders Inside U.S.
(For Products in the U.S. Warehouse, Shenzhen Warehouse)
2.1 Shipping options for an order value under $5 inside the U.S.
Shipping Options:
| Shipping Options | Continental U.S. | Non-Continental U.S. |
|---|---|---|
|
USPS Ground Advantage |
$9.99 Arrive in 3-7 Business Days |
$9.99 Arrive in 5-9 Business Days |
|
UPS Express |
$15.99 Arrive in 2-4 Business Days |
$19.99 Arrive in 3-7 Business Days |
2.2 Shipping options for an order value between $5 and $50 inside the U.S.
Shipping Options:
| Shipping Options | Continental U.S. | Non-Continental U.S. |
|---|---|---|
|
USPS Ground Advantage |
$5.99 Arrive in 3-7 Business Days |
$7.99 Arrive in 5-9 Business Days |
|
UPS Express |
$12.99 Arrive in 2-4 Business Days |
$15.99 Arrive in 3-7 Business Days |
2.3 Free shipping options for an order value of above $50 inside the U.S.:
| Free Shipping Options | Continental U.S. | Non-Continental U.S. |
|---|---|---|
|
USPS Ground Advantage |
Free above $50 | Free above $70 |
|
UPS Express |
+ $ 9.99 for Above $50 | + $ 12.99 for Above $50 |
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 Shenzhen warehouse, we will ship them directly from Shenzhen, China.
- If you place an order for products from both the U.S. warehouse and the Shenzhen warehouse, we will ship your order separately: the products from the Shenzhen warehouse will be sent from Shenzhen, and the products from the U.S. warehouse will be sent from the U.S. warehouse.
3. International Warehouse
Our products are stored in both our U.S. and Shenzhen warehouses to provide more flexible logistics solutions tailored to different regions and customer needs. On each product's description page, we indicate the specific warehouse location to help you better plan your purchase and delivery schedule.
3.1 U.S. Warehouse
3.2 Chinese Warehouse
We will only arrange YunExpressexpress shipping from Shenzhen for orders with products in the Shenzhen warehouse worth more than €50. Orders directly shipped from our Shenzhen warehouse are handled by YunExpress. Given the complexities of international shipping, the estimated delivery time for these packages is around 10 business days, though this may vary slightly due to customs processes or other uncontrollable factors. Otherwise, the products will first be shipped from China to our U.S. warehouse and then shipped to the final destination.
4. Customs and Taxes
4.1 How are customs handled by OpenELAB for import or export?
We aim to minimize delays and ensure compliance, but OpenELAB does not guarantee exemption from U.S. customs charges.
4.2 Are U.S. sales taxes included when the Customer places an order?
If no sales tax is charged at the time of purchase, you may still be responsible for use tax according to your state’s tax laws. OpenELAB is committed to complying with the U.S. Supreme Court's decision in South Dakota v. Wayfair, Inc. and applicable local regulations.
4.3 Are there any other fees besides tax?
Please note that international shipments to the U.S. may occasionally incur customs clearance charges or carrier-imposed fees (e.g., by DHL, FedEx, or USPS). These charges are not controlled by OpenELAB and may vary based on the delivery carrier and U.S. import classification.
Effective Date: September 16th, 2025
At OpenELAB, we are committed to providing accurate product descriptions and delivering high-quality products. If you experience any issues with your purchase, please notify us within 30 days of the shipment date.
1. Warranty Disclaimer
Unless explicitly stated in a specific agreement or purchase order, OpenELAB makes no warranties—express or implied—regarding the fitness, suitability, or merchantability of any product for a particular purpose or special use.
2. Warranty Policy
Warranty Period
The standard warranty period for products sold by OpenELAB is 12 months from the date of delivery.
Under this warranty, OpenELAB will make a reasonable effort to repair or replace products free of charge if defects are due to issues with raw materials, design, or manufacturing.
If the defect qualifies under this policy but falls outside the covered scope, reasonable charges may apply for repair or replacement.
After the warranty period, support may still be available at a reasonable fee.
Warranty Exclusions
The warranty does not apply in the following cases:
- The product is beyond the 12-month warranty period.
- Damage due to misuse, improper maintenance or storage, or failure to follow the user guide or manual.
- Issues caused by Force Majeure events (e.g., natural disasters, war, legal changes, etc.).
- Unauthorized repair attempts by the customer.
- The product is not defective but has been opened and is non-returnable by policy.
3. Returns & Refunds
If you're not satisfied with your purchase, you may be eligible for a return or exchange:
- Return for Refund: Within 15 days of receipt (unopened).
- Return for Replacement: Within 30 days of receipt (damaged or defective).
- Exchange Window: Up to 30 days from receipt.
Please email us at info@openelab.com for a return authorization before sending anything back.
Return Conditions
- Items must be in original, clean, and mint condition with packaging intact.
- Returns of damaged, used, scratched, modified, or programmed items will not be accepted.
- Include the receipt, a brief note with your name, order number, and reason for return.
Shipping & Fees
- Customers are responsible for return shipping to our warehouses in the US.
- If a return is requested due to customer reasons (e.g., change of mind, incorrect order, etc.), both the original shipping cost and the return shipping cost will be deducted from the refund amount.
- For returns due to customer reasons, we will generate and provide a return shipping label.
Payment Platform Fees
For all refunds requested due to customer reasons, a standard service fee will be deducted from the refund amount, which is charged by the payment platforms. The specific fees are as follows:
Shopify Payments: 3.5% + $ 0.3
PayPal: 4.4%
