SKU: SEN0352
DFRobot URM13 is an ultrasonic ranging sensor with an open single probe. It supports TRIG (SR04-compatible), UART (Modbus-RTU) and I2C, working well with 3.3V/5V boards like Arduino/Raspberry Pi. It offers two ranges: 15~150cm (50Hz, indoor obstacle avoidance) and 40~900cm (10Hz, long-range). It auto-adjusts parameters for stable performance in complex scenarios, easy to integrate.
1. Example Code for Arduino-UART Mode (Serial Command)
This code tests the range finder function of the URM13 ultrasonic sensor
2. Example Code for Arduino-UART Mode (Modbus Library)
This code tests the range finder function of the URM13 ultrasonic sensor
3. Example Code for Arduino-TRIG Pulse-triggered Mode
This example is the ultrasonic distance measurement of the module.
4. Example Code for Arduino-I2C Mode
This example is the ultrasonic passive measurement distance and the temperature of the module.
Reference
| Parameter | Value |
|---|---|
| Power Supply | 3.3~5.5V DC |
| Max Instantaneous Work Current | 350mA |
| Effective Measuring Range | 15cm～900cm |
| Distance Resolution | 1cm |
| Distance Error | ±1% |
| Temperature Resolution | 0.1℃ |
| Temperature Error | ±1℃ |
| Measuring Frequency | 10Hz |
| Operating Temperature | -10℃～＋70℃ |
| Operating Humidity | RH<75% |
| Sensor Acoustic Frequency | 40±1KHz |
| Sensor Direction Angle | 60°(-6dB) |
| Communication Interface | I2C&TRIG/UART(Modbus-RTU) |
Users can switch the URM13 communication interface between I2C and UART according to actual use. The selected interface will be automatically saved in the sensor and can be directly used next time.
| Pin | Default function (UART) | Reuse Function (I2C) | Description |
|---|---|---|---|
| VCC | + | + | 3.3~5.5V |
| GND | - | - | Ground |
| C/T | UART-TX | I2C-SCL | Sensor default to UART, please refer to Mode Switch if you need to use I2C. (The pin is in open-drain, internally pull up 6.2K resistance to VCC) |
| D/R | UART-RX | I2C-SDA | Sensor default to UART, please refer to Mode Switch if you need to use I2C.(The pin is in open-drain, internally pull up 6.2K resistance to VCC) |
| EN | Power Enable | Power Enable | Power enable pin, internal pull-up; pull pin EN down to turn off sensor power, leave it floating when this funciton is not used. |
| BUSY | RS485 Receive/Send control Port | BUSY(Open drain output) | - Under UART mode, this pin can be used as RS485 Receive/Send control port. You can expand a RS485 interface by connecting an external RS485 driver IC. - Under I2C mode, BUSY pin will be pulled down in ranging. If pin BUSY outputs high, it means the sensor is in idle state or the last ranging is done; Connect this pin to Master's interrupt port, then the sensor data can be read in real-time when pin BUSY outputs level rising edge. |
| TRIG | NC | TRIG | - Not used in UART mode - In I2C mode, used as external port ranging trigger pin, rising edge trigger. |
| ECHO | NC | ECHO | - Not used in UART mode - In I2C mode, when the sensor ranging function is triggered, this pin outputs a high pulse width that represents ultrasonic transmit time (unit: us) |
The URM13 sensor is set to UART mode by default, and users can switch it between UART and I2C by the short-circuit of different pins before powering on.
After the mode is successfully switched, users can disconnect the short circuit. The switched mode will be recorded by the sensor permanently.
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