DFRobot
URM13 Ultrasonic Sensor
The DFRobot URM13 is a compact ultrasonic ranging sensor with an open single-probe design. It supports three communication methods — TRIG pulse (SR04-compati...
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The DFRobot URM13 is a compact ultrasonic ranging sensor with an open single-probe design. It supports three communication methods — TRIG pulse (SR04-compatible), UART, and I2C — making it versatile for a wide range of applications. The sensor operates on 3.3 V or 5 V, compatible with Arduino, Raspberry Pi, and other common development boards.
An integrated precision circuit and smart detection algorithms enable automatic ambient and electrical noise detection, with real-time calibration of sensor parameters for stable performance in demanding environments. In UART mode, the sensor uses the standard Modbus-RTU protocol with receive/send control output, allowing easy expansion to RS485 via an external transceiver.
Key Features
- Triple Interface – TRIG pulse (SR04-compatible), UART (Modbus-RTU), and I2C
- Wide Measuring Range – 15 cm to 900 cm with 1 cm resolution
- Automatic Noise Calibration – Real-time detection and adjustment for ambient and electrical noise
- RS485 Ready – UART mode with Modbus-RTU and TX/RX control output for RS485 expansion
- Compact Design – Small, lightweight single-probe form factor
- Wide Voltage Range – 3.3–5.5 V DC
Specifications
- Power Supply – 3.3–5.5 V DC
- Max Current – 350 mA (instantaneous)
- Measuring Range – 15–900 cm
- Resolution – 1 cm
- Accuracy – 1%
- Measuring Frequency – Up to 10 Hz
- Operating Temperature – −10 °C to +70 °C
- Dimensions – 22 × 20 mm
Ideal For
- Robotics obstacle detection and navigation
- Distance measurement and level sensing
- Industrial monitoring with RS485 networks
- Arduino and Raspberry Pi projects
Package Contents
- 1× URM13 Ultrasonic Sensor
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- Modbus
- Modbus is an industrial communication protocol used by many meters, sensors, PLCs and automation devices. When a product lists Modbus support, it is generally easier to integrate with existing industrial equipment that speaks the same protocol.
- ModBus-RTU
- ModBus-RTU is a common industrial protocol for sending readings and control commands over serial links such as RS485. Knowing a device uses ModBus-RTU helps you choose software libraries, data loggers, or controllers that can request and interpret its data.
- RS485
- RS485 is a robust differential serial communication standard often used in factories, farms and buildings where cables may be long or electrically noisy, and it can link many devices on a single pair of wires. When a product lists RS485, it can communicate with industrial sensors, meters and control equipment over longer distances than typical hobby serial wiring.
- RX
- RX means receive, usually showing data being received by the board. An RX indicator LED can help with troubleshooting USB or serial communication.
- TX
- TX means transmit, usually showing data being sent from the board. A TX indicator LED can help you see when the board is communicating or uploading code.
- UART
- UART is a simple asynchronous serial interface that sends data over separate transmit and receive wires, usually labelled TX and RX, with both ends set to the same baud rate. It is a common way for microcontrollers and other serial devices to exchange data.
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Supplier page — dfrobot.com
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