{"product_id":"40khz-ultrasonic-probe-sensor-ma40s4r-ma40s4s-obstacle-avoidance-robot","title":"40KHz Ultrasonic Probe MA40S4R MA40S4S Sensor | Robot \u0026 DIY","description":"\n\u003ch2\u003eMA40S4R \/ MA40S4S 40KHz Ultrasonic Transmitting \u0026amp; Receiving Probe Sensor\u003c\/h2\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e40KHz Operating Frequency\u003c\/strong\u003e – Optimised for maximum detection accuracy and minimal interference in ultrasonic sensing circuits.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTransmit \u0026amp; Receive Variants\u003c\/strong\u003e – MA40S4S (transmitter) and MA40S4R (receiver) available; select the configuration you need.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Construction\u003c\/strong\u003e – Built from a robust plastic and metal composite for long-lasting performance in prototyping and production environments.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Compatibility\u003c\/strong\u003e – Ideal for robot cars, drone proximity sensing, automated obstacle-avoidance systems, and hobbyist microcontroller projects (Arduino, Raspberry Pi, etc.).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Easy to Install\u003c\/strong\u003e – Standard probe form factor slots easily into breadboards and PCB designs.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh Sensitivity\u003c\/strong\u003e – Delivers consistent, accurate readings even at varying distances and angles.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMA40S4R (Receiver) \/ MA40S4S (Transmitter)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Frequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e40 KHz\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePlastic + Metal\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePackage Contents\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 × Ultrasonic Probe Sensor\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCommon Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eRobot car obstacle detection \u0026amp; avoidance\u003c\/li\u003e\n  \u003cli\u003eAutonomous vehicle proximity sensing\u003c\/li\u003e\n  \u003cli\u003eIndustrial distance measurement systems\u003c\/li\u003e\n  \u003cli\u003eSmart home automation sensors\u003c\/li\u003e\n  \u003cli\u003eDIY electronics and microcontroller projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eNote: Colour may vary slightly from product images due to monitor brightness and lighting conditions. Please refer to the actual item received.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/25-in-1-precision-magnetic-screwdriver-set-pro-repair-tool-kit\"\u003e25-in-1 Precision Magnetic Screwdriver Set | Pro Repair Kit\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/34-compartment-double-sided-hardware-storage-box-removable-dividers\"\u003e34-Compartment Double-Sided Hardware Storage Box \u0026amp; Dividers\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/waterproof-cable-gland-set-pg7-pg9-nylon-connectors-10-pack\"\u003e10-Pack Waterproof Cable Glands PG7 PG9 Nylon Connectors\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/hand-power-tools\" target=\"_blank\" rel=\"noopener\"\u003eOSHA guidance on hand and power tools\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the difference between the MA40S4R and MA40S4S ultrasonic sensors?\u003c\/h4\u003e\n\u003cp\u003eA: The MA40S4S is the \u003cstrong\u003etransmitter\u003c\/strong\u003e probe that emits 40KHz ultrasonic pulses, while the MA40S4R is the \u003cstrong\u003ereceiver\u003c\/strong\u003e 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.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this ultrasonic probe compatible with Arduino and Raspberry Pi?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003ch4\u003eQ: How many probes come in the package?\u003c\/h4\u003e\n\u003cp\u003eA: Each listing includes \u003cstrong\u003e1 × ultrasonic probe sensor\u003c\/strong\u003e. Please select either the MA40S4R (receiver) or MA40S4S (transmitter) variant according to your project requirements, and order the quantity you need.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the difference between the MA40S4R and MA40S4S ultrasonic sensors?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"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.\"}}, {\"@type\": \"Question\", \"name\": \"Is this ultrasonic probe compatible with Arduino and Raspberry Pi?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. 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