Waveshare Flame Sensor
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Waveshare Flame Sensor
Waveshare Flame Sensor is a compact infrared flame detection module designed for detecting fire sources, flame signals, and strong infrared radiation emitted by open flame. This flame sensor is widely used in fire alarms, fire-fighting robots, safety experiments, smart hardware, and embedded projects that need fast flame detection and alarm triggering.
The Waveshare Flame Sensor is sensitive to the flame spectrum and uses an onboard LM393 comparator to provide both digital output and analog output. It supports adjustable sensitivity, works with 3.3V to 5.3V systems, and can be used with Raspberry Pi Pico, Arduino, STM32, and other common controllers. Because it provides both analog and digital signals, this flame sensor module is suitable for simple trigger applications as well as projects that need more detailed signal reading.

Features
- Sensitive to flame spectrum for fire source detection
- Onboard LM393 comparator for stable signal processing
- Adjustable sensitivity via onboard potentiometer
- Provides both analog output and digital output
- Signal output indicator for easier status monitoring
- Compatible with 3.3V to 5.3V power input
- Suitable for Raspberry Pi Pico, Arduino, and STM32 projects
- Useful for flame alarms, robotics, and safety experiments
Specifications
| Brand | Waveshare |
| Product Name | Flame Sensor |
| Main Circuit | LM393 comparator |
| Spectrum Range | 760nm ~ 1100nm |
| Detection Angle | 0 - 60° |
| Power Supply | 3.3V ~ 5.3V |
| Operating Temperature | -25°C ~ 85°C |
| Dimensions | 27.3mm × 15.4mm |
| Mounting Holes Size | 2.0mm |
| Outputs | AOUT analog output, DOUT digital output |
Applications
- Fire detection and flame alarm systems
- Fire-fighting robot projects
- Smart hardware safety experiments
- Infrared flame sensing in embedded systems
- Raspberry Pi Pico, Arduino, and STM32 sensor projects
- Educational electronics and robotics training
Product List
- Flame Sensor x1
- 4-pin custom connector jumper wire x1
Other Content
Pin definition
| G | GND, power input negative |
| V | VCC, power input positive |
| S | Digital signal pin |
| A | Analog signal pin |
Schematic diagram

How it works
The Waveshare Flame Sensor detects the infrared signal emitted by flame. The onboard LM393 comparator converts the detected signal into a stable digital trigger while the analog pin provides a varying signal level that changes with flame intensity and distance. This makes it useful both for threshold alarms and for more detailed sensor analysis.
Safe use reminder
This flame sensor module is designed to detect fire, but it is not fireproof itself. Keep a safe distance from flame during use to avoid damaging the sensor. If you want related background reading, your site also has useful ecosystem articles on Waveshare and Raspberry Pi.
Resources
FAQ
Can this flame sensor provide both digital and analog output?
Yes. The Waveshare Flame Sensor provides DOUT for digital trigger output and AOUT for analog signal output.
How do I adjust the sensor sensitivity?
The sensitivity can be adjusted through the onboard potentiometer, allowing you to tune the trigger threshold according to your project requirements.
What kinds of projects is this module suitable for?
This flame sensor module is suitable for fire detection, fire-fighting robots, safety alarms, smart hardware experiments, and microcontroller-based educational electronics projects.
1. General Shipping Information
- We provide reliable shipping services with a tracking number for each order.
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- 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.
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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 |
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.
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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.


