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Raspberry Pi |
x 1 | |
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Ultrasonic Sensor |
x 1 | |
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Servo Motor |
x 1 | |
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PWM Driver |
x 1 |
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Thonny IDE |
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Raspbian OS |
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Python |
Raspberry Pi + Servo Motor + Ultrasonic Sensor
Hello!
We have prepared a small tutorial with Raspberry Pi + Ultrasonic
Sensor + Servo Motor. I would try another Raspberry Pi application for
beginners; I looked among the pieces I had at my disposal, and found something
interesting; I searched the internet for information about the parts I have,
how to control them individually, and now I will try to combine them to make an
application for learning purposes.
Components used in this project:
- Raspberry Pi;
- Ultrasonic Sensor HC SR-04;
- Servo Motor SG90;
- PCA9685 PWM Driver.
The first step is to install a library, which will help us use
the PWM driver PCA9685 (Figure 1), useful to control a servomotor, an LED or a
dc motor. Information can be found at this link:
https://learn.adafruit.com/adafruit-16-channel-servo-driver-with-raspberry-pi/using-the-adafruit-library.
Figure 1
We start by opening Terminal Window and writing the command:
sudo pip3 install
adafruit-circuitpython-servokit
We are waiting for the package installation to be completed.
The control of the SG 90 servomotor (Figure 2) is easy, we only
need a few program lines written in Thonny IDE:
from
adafruit_servokit import ServoKit
kit = ServoKit
(channels = 16)
We import and initialize the ServoKit class.
Then, to move the actuator to an angle we want, we add the
command:
kit.servo [0] .angle
= 0
Figure 2
The HC SR-04 ultrasonic sensor (Figure 3) is affordable, easy to
use at 5V.
Figure 3
The electronic scheme according to which the connections are
made is the following:
Figure 4
The servomotor is connected to channel 0 of PCA9685; a supply
voltage of 5V is required for the servomotor and the ultrasonic sensor, and a
3.3V for the logic circuit of the PCA9685; PCA9685 driver, SDA and SCL pins
connect SDA and SCL pins on the Raspberry Pi (physical pins 3 and 5); for the
ultrasonic sensor, the Trig pin -> GPIO23 (physical pin 16) and Echo ->
GPIO24 (physical pin 18).
Practical realization of the project (Figure 5):
Figure 5
The distance is displayed in centimeters, with two decimals, the
program is run in Thonny Python (Figure 6):
Figure 6
Thanks to the PCBWay team for this activity!
We expect as much from you!
Success!
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Raspberry Pi + Servo Motor + Ultrasonic Sensor
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Engineer Jan 06,2024
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