40KHz Ultrasonic Probe MA40S4R MA40S4S Sensor | Robot & DIY
40KHz Ultrasonic Probe MA40S4R MA40S4S Sensor | Robot & DIY
MA40S4R / MA40S4S 40KHz Ultrasonic Transmitting & Receiving Probe Sensor
The MA40S4R and MA40S4S are precision 40KHz ultrasonic probe sensors designed for high-accuracy distance detection and obstacle avoidance in robotics, automated vehicles, and DIY electronics projects. Whether you need a transmitter (MA40S4S) or receiver (MA40S4R), these compact plastic-and-metal probes deliver reliable, consistent ultrasonic sensing performance for a wide range of applications.
Key Features
- 40KHz Operating Frequency – Optimised for maximum detection accuracy and minimal interference in ultrasonic sensing circuits.
- Transmit & Receive Variants – MA40S4S (transmitter) and MA40S4R (receiver) available; select the configuration you need.
- Durable Construction – Built from a robust plastic and metal composite for long-lasting performance in prototyping and production environments.
- Wide Compatibility – Ideal for robot cars, drone proximity sensing, automated obstacle-avoidance systems, and hobbyist microcontroller projects (Arduino, Raspberry Pi, etc.).
- Compact & Easy to Install – Standard probe form factor slots easily into breadboards and PCB designs.
- High Sensitivity – Delivers consistent, accurate readings even at varying distances and angles.
Specifications
| Model | MA40S4R (Receiver) / MA40S4S (Transmitter) |
| Operating Frequency | 40 KHz |
| Material | Plastic + Metal |
| Package Contents | 1 × Ultrasonic Probe Sensor |
| Country of Origin | Made in Mainland China |
Common Applications
- Robot car obstacle detection & avoidance
- Autonomous vehicle proximity sensing
- Industrial distance measurement systems
- Smart home automation sensors
- DIY electronics and microcontroller projects
Note: Colour may vary slightly from product images due to monitor brightness and lighting conditions. Please refer to the actual item received.
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Frequently Asked Questions
Q: What is the difference between the MA40S4R and MA40S4S ultrasonic sensors?
A: The MA40S4S is the transmitter probe that emits 40KHz ultrasonic pulses, while the MA40S4R is the receiver probe that detects the reflected ultrasonic signals. In a typical obstacle-avoidance or distance-measurement circuit, both are used together — one to send the ultrasonic wave and one to receive the echo.
Q: Is this ultrasonic probe compatible with Arduino and Raspberry Pi?
A: Yes. The MA40S4R / MA40S4S 40KHz ultrasonic probes are widely used in Arduino, Raspberry Pi, and other microcontroller-based projects. They are a standard component in ultrasonic ranging modules and can be integrated into custom sensor circuits for robot cars, drones, and automation systems.
Q: How many probes come in the package?
A: Each listing includes 1 × ultrasonic probe sensor. Please select either the MA40S4R (receiver) or MA40S4S (transmitter) variant according to your project requirements, and order the quantity you need.