M5Stack Microphone Unit (LM393)
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M5Stack Microphone Unit (LM393)
Description
M5Stack Microphone Unit (LM393), also known as Unit MIC, is a compact sound sensor module for M5Stack projects. It combines an omnidirectional electret microphone with a MAX4466 microphone preamplifier to help suppress power-supply noise and common-mode noise while providing high-fidelity sound output in noisy environments. The module supports both analog and digital signal output, making it useful for audio sampling, sound-to-electricity conversion, and sound-activated control.
The M5Stack Microphone Unit (LM393) also integrates an LM393 dual voltage comparator. By adjusting the onboard 10K potentiometer, users can set the comparison-voltage threshold for digital trigger output while still using the analog signal for waveform or sound-level processing. This makes the M5Stack Microphone Unit (LM393) suitable for prototyping audio interaction, voice switch projects, and compact IoT sound detection systems.
Features
- Sound sampling and audio recording: captures environmental sound for audio input and detection projects.
- MAX4466 preamplifier: improves microphone signal output and helps reduce power-supply and common-mode noise.
- Omnidirectional microphone: provides 52dB sensitivity for broad sound pickup around the module.
- Analog and digital outputs: supports waveform-level processing and threshold-based trigger detection.
- LM393 threshold control: includes a voltage comparator and adjustable potentiometer for digital trigger tuning.
- M5Stack development workflow: supports Arduino and UIFlow development with the HY2.0-4P interface.
- Compact mounting: includes 2 LEGO-compatible holes for quick integration into prototypes and fixtures.
Specifications
| Microphone sensitivity / signal-to-noise ratio | 52dB / 40dB |
| Output signal | Analog / Digital |
| Input voltage | 5V |
| Product size | 32.0 x 24.0 x 8.0mm |
| Product weight | 4.6g |
| Package size | 138.0 x 93.0 x 9.0mm |
| Gross weight | 10.0g |
Applications
- Sound-to-electricity conversion experiments
- Sound-activated switches and trigger input
- Audio sampling and sound-level detection
- Interactive installations and responsive prototypes
- Smart home or IoT sound monitoring projects
Product List
| 1 | Unit MIC |
| 1 | HY2.0-4P Grove cable (20cm) |
Other Content
PinMap
| HY2.0-4P wire color | Black | Red | Yellow | White |
| PORT.B function | GND | 5V | Digital Output | Analog Output |
The M5Stack Microphone Unit (LM393) is designed for PORT.B connection and can be used with Arduino or UIFlow examples for microphone AD-value sampling and threshold-based sound detection.
Resources
- M5Stack Unit MIC documentation
- MAX4466 datasheet
- LM393 datasheet
- Unit MIC Arduino example
- Unit MIC EasyLoader
FAQ
What is the M5Stack Microphone Unit (LM393) used for?
It is used for audio sampling, sound-to-electricity conversion, and sound-activated switch projects where a compact analog and digital sound sensor is needed.
What is the difference between the analog and digital outputs?
The analog output can be used for sound-level or waveform processing, while the digital output is controlled by the adjustable LM393 threshold circuit.
Which development platforms are supported?
The module is designed for M5Stack workflows and supports Arduino and UIFlow development through the HY2.0-4P interface.
1. General Shipping Information
- We provide reliable shipping services with a tracking number for each order.
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- In-stock orders are usually dispatched within 1 business day after order confirmation.
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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 |
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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.
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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.








