Sensor
HC-SR04 ultrasonic ranger
Measures distance from 2 cm to ~4 m by timing an ultrasonic echo.
Pinout
- VCCpower (5 V)
- TRIGdigital
- ECHOdigital
- GNDground
Bench notes
On 3.3 V boards, put a voltage divider (1 kΩ / 2 kΩ) on ECHO — the module echoes at 5 V.
- Typical price
- $1.90
- Libraries
- none needed
- Prompt keywords
- distance, ultrasonic, parking, range