Ultrasonic distance sensors
Ultrasonic distance sensors measure the distance to a target by timing an echo of sound. They work on any surface colour, in darkness and in dust, which makes them the standard choice for robot obstacle avoidance, parking lots, level checks and presence detection.
19 models
19 models
A01-V2.0
Waterproof Ultrasonic Distance Sensor, Optional Horn, IP67
- Range
- 28-450 cm
- Accuracy
- ±(1+S* 0.3%)
A02-V2.0
Split Waterproof Ultrasonic Distance Sensor, Housed
- Range
- 3cm-450cm
- Accuracy
- ±(1+S* 0.3%)
A02-V2.0
Small Blind-Zone Ultrasonic Obstacle-Avoidance Sensor
- Range
- 3–450 cm
- Accuracy
- ±(1+S*0.5%) cm
A02YY-V2.0
Split Waterproof Ultrasonic Module, No Housing
- Range
- 3cm-450cm
- Accuracy
- ±(1+S* 0.3%)
A05-V1.1
Four-Channel Ultrasonic Ranging Module, UART, RS485, Relay
- Range
- 28-450 cm
- Accuracy
- ±(1+S*0.3%) cm
A06-V1.1
Compact Ultrasonic Distance Module, Selectable Object Mode
- Range
- 25-600 cm
- Accuracy
- ±(1+S×0.3–0.5%)
A09-V1.0
Compact Ultrasonic Distance Sensor, 20 to 350 cm, IP67
- Range
- 20-350cm
- Output
- UART/PMW/switch
A11-V1.0
Ultrasonic Distance Sensor with Bracket, 21 to 300 cm
- Range
- 21-300cm
- Output
- UART/PMW/switch output
A12-V1.0
Wide-Voltage Ultrasonic Distance Sensor, Round Housing
- Range
- 25–500 cm
- Output
- UART output pin
A19-V1.0
Ultrasonic Distance Sensor, Closed Waterproof Probe on Cable
- Range
- 28–450 cm
- Accuracy
- ±(1+S*0.3%) cm
A21-V1.0
Small Blind-Zone Waterproof Ultrasonic Sensor, Multi-Output
- Range
- 3–500 cm
- Accuracy
- 1+(S*0.3%) cm
A22-V1.0
Dual-Probe Ultrasonic Sensor, 1 cm Blind Zone, IP67
- Range
- 2–300 cm
- Accuracy
- 1+(S*0.3%) cm
A24-V1.0
Ultrasonic Obstacle-Avoidance Module, 20 cm Blind Zone
- Range
- 50 / 150 / 250 / 350 cm
- Accuracy
- 1+(S*0.5%) cm
A25-V1.0
Ultrasonic Obstacle Sensor for Lawn-Mowing Robots, IP67
- Range
- 3-200 cm
- Output
- UART / UART controlled
H01-V1.0
Ultrasonic Height-Measurement Module, Capacitive Transducer
- Range
- 100-3000 mm
- Accuracy
- ±(8mm+S*0.2%)
H03-V1.0
Dual-Probe Ultrasonic Height-Measurement Module
- Range
- 3–250 cm
- Output
- UART controlled output
ME007-ULA-V1.2
Long-Range Waterproof Ultrasonic Sensor, RS232/Analog
- Range
- 27–800 cm
- Accuracy
- ±(1+S*0.3%) cm
ME007-ULS-V1.4
Long-Range Waterproof Ultrasonic Sensor, UART, PWM or Switch
- Range
- 27–800 cm
- Accuracy
- ±(1+S*0.5%) cm
ME007YS-V1.1
Waterproof Ultrasonic Sensor, Cabled Probe, UART/PWM/Switch
- Range
- 28-450 cm
- Accuracy
- ±(1+S*0.5%) cm
Compare Ultrasonic distance sensors
| Model | Range | Output | Accuracy | Blind zone |
|---|---|---|---|---|
| A01-V2.0 Waterproof Ultrasonic Distance Sensor, Optional Horn, IP67 | 28-450 cm | UART / PWM / switch output | ±(1+S* 0.3%) | 28 cm |
| A02-V2.0 Split Waterproof Ultrasonic Distance Sensor, Housed | 3cm-450cm | UART output | ±(1+S* 0.3%) | |
| A02-V2.0 Small Blind-Zone Ultrasonic Obstacle-Avoidance Sensor | 3–450 cm | PWM pulse width | ±(1+S*0.5%) cm | 3 cm |
| A02YY-V2.0 Split Waterproof Ultrasonic Module, No Housing | 3cm-450cm | UART output | ±(1+S* 0.3%) | |
| A05-V1.1 Four-Channel Ultrasonic Ranging Module, UART, RS485, Relay | 28-450 cm | UART serial | ±(1+S*0.3%) cm | |
| A06-V1.1 Compact Ultrasonic Distance Module, Selectable Object Mode | 25-600 cm | UART/PWM | ±(1+S×0.3–0.5%) | |
| A09-V1.0 Compact Ultrasonic Distance Sensor, 20 to 350 cm, IP67 | 20-350cm | UART/PMW/switch | 20cm | |
| A11-V1.0 Ultrasonic Distance Sensor with Bracket, 21 to 300 cm | 21-300cm | UART/PMW/switch output | 21cm | |
| A12-V1.0 Wide-Voltage Ultrasonic Distance Sensor, Round Housing | 25–500 cm | UART output pin | 25 cm | |
| A19-V1.0 Ultrasonic Distance Sensor, Closed Waterproof Probe on Cable | 28–450 cm | PWM | ±(1+S*0.3%) cm | 28 cm |
| A21-V1.0 Small Blind-Zone Waterproof Ultrasonic Sensor, Multi-Output | 3–500 cm | UART, PWM, RS485, IIC, switch | 1+(S*0.3%) cm | 3 cm |
| A22-V1.0 Dual-Probe Ultrasonic Sensor, 1 cm Blind Zone, IP67 | 2–300 cm | 1+(S*0.3%) cm | 1 cm | |
| A24-V1.0 Ultrasonic Obstacle-Avoidance Module, 20 cm Blind Zone | 50 / 150 / 250 / 350 cm | 1+(S*0.5%) cm | 20 cm | |
| A25-V1.0 Ultrasonic Obstacle Sensor for Lawn-Mowing Robots, IP67 | 3-200 cm | UART / UART controlled | ||
| H01-V1.0 Ultrasonic Height-Measurement Module, Capacitive Transducer | 100-3000 mm | PWM pulse width | ±(8mm+S*0.2%) | |
| H03-V1.0 Dual-Probe Ultrasonic Height-Measurement Module | 3–250 cm | UART controlled output | 0–3 cm | |
| ME007-ULA-V1.2 Long-Range Waterproof Ultrasonic Sensor, RS232/Analog | 27–800 cm | RS232 | ±(1+S*0.3%) cm | |
| ME007-ULS-V1.4 Long-Range Waterproof Ultrasonic Sensor, UART, PWM or Switch | 27–800 cm | PWM | ±(1+S*0.5%) cm | |
| ME007YS-V1.1 Waterproof Ultrasonic Sensor, Cabled Probe, UART/PWM/Switch | 28-450 cm | PWM pulse width | ±(1+S*0.5%) cm |
How it works
A transducer sends a short burst of ultrasound and switches to listening. The sensor measures the time until the echo returns and converts it to distance using the speed of sound, corrected for temperature. The blind zone is the short range where the transducer is still ringing and cannot hear an echo.
How to choose
- Measuring range and blind zone for your closest and farthest target
- Beam angle: narrow for long range and tanks, wide for obstacle detection
- Output: UART, PWM, RS485, switch or analogue
- Enclosure: open module or sealed waterproof probe with an IP rating
Frequently asked questions
How accurate is an ultrasonic distance sensor?
Typical accuracy is around ±1 cm plus a small percentage of the reading, depending on the model, the target and the air temperature. Each DWIN datasheet lists the accuracy for that model.
What is the blind zone of an ultrasonic sensor?
It is the minimum distance the sensor can measure. Inside it the transducer is still vibrating from its own pulse and cannot detect an echo. Choose a model whose blind zone is shorter than your closest target.
Do ultrasonic sensors work outdoors?
Yes. Sealed probes rated IP67 or higher work outdoors and in rain. Strong wind, heavy rain and foam can weaken the echo, so allow margin in range.