Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Model Number | AJ-SR04M / RCWL-1670 |
| Operating Voltage | 3.3V - 5V DC |
| Detection Range | 2cm to 400cm |
| Interface Type | UART Serial Output |
| Beam Angle | Approx. 15 degrees |
| Frequency | 40kHz Ultrasonic |
| Waterproof Rating | IP67 Sealed Design |
| Operating Temperature | -20°C to +70°C |
| Dimensions | 45mm x 20mm x 15mm |
| Application | Reverse Parking, Obstacle Avoidance |
Anonymous
Mar 31, 2026
Rating: 4/5
Good value for money
Works exactly as described in the datasheet. Setup was straightforward using the provided documentation. It reacts quickly to obstacles, which is crucial for my autonomous vehicle prototype.
Anonymous
Mar 29, 2026
Rating: 5/5
Solid build quality
The casing feels very durable and the sealing looks professional. I am using this for an outdoor security alert system and it hasn't given me a single false alarm due to weather conditions.
Anonymous
Mar 18, 2026
Rating: 4/5
Great waterproofing, easy install
Installed this on the rear bumper of my golf cart. It has survived several rainstorms without any issues. The only reason for 4 stars is that the cable could be a bit longer, but otherwise excellent quality.
Anonymous
Mar 16, 2026
Rating: 5/5
Best ultrasonic sensor we've used
We bought a batch of these for our workshop classes. Students find the UART interface much less confusing to program. All units arrived working perfectly and have held up well to heavy handling.
Anonymous
Mar 11, 2026
Rating: 5/5
Perfect for my Arduino parking project
This sensor works flawlessly with my microcontroller setup. The serial output makes it much easier to integrate than the standard trigger/echo pins on older models. Distance readings are consistent and stable.
Anonymous
Mar 09, 2026
Rating: 5/5
Reliable ranging module
I've tested this against a laser measure and the accuracy is impressive for the price point. The integrated transceiver design saves a lot of space on my robot chassis. Highly recommended for DIY enthusiasts.
Q: What is the maximum detection distance in bright sunlight?
A: Ultrasonic sensors are generally not affected by visible light. The maximum range remains approximately 400cm regardless of lighting conditions, though extreme wind or soft surfaces may affect accuracy.
Q: Does this sensor work directly with Raspberry Pi GPIO?
A: Yes, it works with Raspberry Pi. Since it uses UART serial communication, you will need to connect the TX pin of the sensor to the RX pin of the Pi and ensure voltage levels are compatible (3.3V logic).
Q: Can I submerge this unit completely underwater?
A: While it has an IP67 rating meaning it can withstand temporary immersion up to 1 meter for 30 minutes, it is designed primarily for splash resistance and rain protection, not continuous underwater operation.
Q: How do I calibrate the sensor if readings seem off?
A: The sensor comes pre-calibrated. If readings are inconsistent, check for obstructions near the transducer face or ensure the mounting surface is not vibrating. Software averaging filters can also smooth out minor fluctuations.
Q: Is there a library available for ESP32?
A: Yes, there are several open-source libraries available on GitHub specifically for the AJ-SR04M that support ESP32. You can search for 'AJ-SR04M ESP32 library' to find compatible code examples.
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