Difference between revisions of "Ultrasonic Sensor HC-SR04"
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(Created page with "= Description = The HC-SR04 is an ultrasonic distance sensor that can measure distances from 2cm to 400cm. It sends out an ultrasound signal and detects the echo. By measuring...") |
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It sends out an ultrasound signal and detects the echo. By measuring the time you can calculate the distance. | It sends out an ultrasound signal and detects the echo. By measuring the time you can calculate the distance. | ||
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more details: | more details: | ||
* https://randomnerdtutorials.com/complete-guide-for-ultrasonic-sensor-hc-sr04/ | * https://randomnerdtutorials.com/complete-guide-for-ultrasonic-sensor-hc-sr04/ | ||
* https://cdn.sparkfun.com/datasheets/Sensors/Proximity/HCSR04.pdf | * https://cdn.sparkfun.com/datasheets/Sensors/Proximity/HCSR04.pdf | ||
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= How to connect it electrically = | = How to connect it electrically = | ||
Revision as of 23:10, 30 August 2020
Contents
Description
The HC-SR04 is an ultrasonic distance sensor that can measure distances from 2cm to 400cm. It sends out an ultrasound signal and detects the echo. By measuring the time you can calculate the distance.
more details:
- https://randomnerdtutorials.com/complete-guide-for-ultrasonic-sensor-hc-sr04/
- https://cdn.sparkfun.com/datasheets/Sensors/Proximity/HCSR04.pdf
How to connect it electrically
Required Module and Files
- We use hcsr04.py
- this is downloaded from https://github.com/rsc1975/micropython-hcsr04
- the original file is at https://github.com/rsc1975/micropython-hcsr04/blob/master/hcsr04.py
How to control it in MicroPython
1 from hcsr04 import HCSR04
2 from time import sleep
3
4 sensor = HCSR04(trigger_pin=12, echo_pin=14)
5 sleep(1)
6 i=0
7
8 while True:
9 distance = sensor.distance_cm()
10 print(i, ': Distance:', distance, 'cm')
11 i=i+1
12 sleep(0.5)
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