Note
Hello, welcome to the SunFounder Raspberry Pi & Arduino & ESP32 Enthusiasts Community on Facebook! Dive deeper into Raspberry Pi, Arduino, and ESP32 with fellow enthusiasts.
Why Join?
Expert Support: Solve post-sale issues and technical challenges with help from our community and team.
Learn & Share: Exchange tips and tutorials to enhance your skills.
Exclusive Previews: Get early access to new product announcements and sneak peeks.
Special Discounts: Enjoy exclusive discounts on our newest products.
Festive Promotions and Giveaways: Take part in giveaways and holiday promotions.
👉 Ready to explore and create with us? Click [here] and join today!
3.1.2 Welcome
Introduction
In this project, we will use PIR to sense the movement of pedestrians, and use servos, LED, buzzer to simulate the work of the sensor door of the convenience store. When the pedestrian appears within the sensing range of the PIR, the indicator light will be on, the door will be opened, and the buzzer will play the opening bell.
Required Components
In this project, we need the following components.
It’s definitely convenient to buy a whole kit, here’s the link:
Name |
ITEMS IN THIS KIT |
LINK |
|---|---|---|
Raphael Kit |
337 |
You can also buy them separately from the links below.
COMPONENT INTRODUCTION |
PURCHASE LINK |
|---|---|
- |
|
Schematic Diagram
T-Board Name |
physical |
wiringPi |
BCM |
GPIO18 |
Pin 12 |
1 |
18 |
GPIO17 |
Pin 11 |
0 |
17 |
GPIO27 |
Pin 13 |
2 |
27 |
GPIO22 |
Pin 15 |
3 |
22 |
Experimental Procedures
Step 1: Build the circuit.
Step 2: Change directory.
cd ~/raphael-kit/c/3.1.2/
Step 3: Compile.
gcc 3.1.2_Welcome.c -lwiringPi
Step 4: Run.
sudo ./a.out
After the code runs, if the PIR sensor detects someone passing by, the door will automatically open (simulated by the servo), turn on the indicator and play the doorbell music. After the doorbell music plays, the system will automatically close the door and turn off the indicator light, waiting for the next time someone passes by.
There are two potentiometers on the PIR module: one is to adjust sensitivity and the other is to adjust the detection distance. To make the PIR module work better, you You need to turn both of them counterclockwise to the end.
Note
If it does not work after running, or there is an error prompt: "wiringPi.h: No such file or directory", please refer to Install and Check the WiringPi.
Code Explanation
void setAngle(int pin, int angle){ //Create a funtion to control the angle of the servo.
if(angle < 0)
angle = 0;
if(angle > 180)
angle = 180;
softPwmWrite(pin,Map(angle, 0, 180, 5, 25));
}
Create a function, setAngle to write the angle in the servo that is 0-180.
void doorbell(){
for(int i=0;i<sizeof(song)/4;i++){
softToneWrite(BuzPin, song[i]);
delay(beat[i] * 250);
}
Create a function, doorbell to enable the buzzer to play music.
void closedoor(){
digitalWrite(ledPin, LOW); //led off
for(int i=180;i>-1;i--){ //make servo rotate from maximum angle to minimum angle
setAngle(servoPin,i);
delay(1);
}
}
Create a closedoor function to simulate closing the door, turn off the LED and let the servo turn from 180 degrees to 0 degree.
void opendoor(){
digitalWrite(ledPin, HIGH); //led on
for(int i=0;i<181;i++){ //make servo rotate from minimum angle to maximum angle
setAngle(servoPin,i);
delay(1);
}
doorbell();
closedoor();
}
The function opendoor() includes several parts: turn on the indicator light, turn the servo (simulate the action of opening the door), play the doorbell music of the convenience store, and call the function closedoor() after playing music.
int main(void)
{
if(wiringPiSetup() == -1){ //when initialize wiring failed,print message to screen
printf("setup wiringPi failed !");
return 1;
}
if(softToneCreate(BuzPin) == -1){
printf("setup softTone failed !");
return 1;
......
In the function main(), initialize library wiringPi and setup softTone, then set ledPin to output state and pirPin to input state. If the PIR sensor detects someone passing by, the function opendoor will be called to simulate opening the door.
Phenomenon Picture
