Circuit Documentation

Summary

This circuit involves an ESP32 microcontroller interfacing with two HC-SR05 ultrasonic sensors and a Micro Servo 9G. The ESP32 reads distance measurements from the ultrasonic sensors and controls the servo motor based on the distance readings.

Component List

ESP32 on Baseboard

• Description: A versatile microcontroller with Wi-Fi and Bluetooth capabilities.
• Pins: GPIO23, GPIO22, GPIO1/TX, GPIO3/RX, GPIO21, GPIO19, GPIO18, GPIO5, GPIO17, GPIO16, GPIO4, GPIO0, GPIO2, GPIO15, SD1, SD0, CLK, V, G, GPIO36, GPIO39, GPIO34, GPIO35, GPIO32, GPIO33, GPIO25, GPIO26, GPIO27, GPIO14, GPIO12, GPIO13, SD2, SD3, GND, 5V, 3V, TX, RX, VCC, D22, D21

Micro Servo 9G

• Description: A small servo motor used for precise control of angular position.
• Pins: GND, +5V, PWM

HC-SR05 (Sensor 1)

• Description: An ultrasonic sensor used for distance measurement.
• Pins: VCC, TRIG, GND, ECHO, OUT

HC-SR05 (Sensor 2)

• Description: An ultrasonic sensor used for distance measurement.
• Pins: VCC, TRIG, GND, ECHO, OUT

Wiring Details

ESP32 on Baseboard

• GPIO23: Connected to PWM of Micro Servo 9G
• GPIO19: Connected to ECHO of HC-SR05 (Sensor 2)
• GPIO18: Connected to TRIG of HC-SR05 (Sensor 2)
• GPIO5: Connected to TRIG of HC-SR05 (Sensor 1)
• GPIO17: Connected to ECHO of HC-SR05 (Sensor 1)
• 5V: Connected to VCC of HC-SR05 (Sensor 1), VCC of HC-SR05 (Sensor 2), and +5V of Micro Servo 9G
• GND: Connected to GND of HC-SR05 (Sensor 1), GND of HC-SR05 (Sensor 2), and GND of Micro Servo 9G

Micro Servo 9G

• PWM: Connected to GPIO23 of ESP32 on Baseboard
• +5V: Connected to 5V of ESP32 on Baseboard
• GND: Connected to GND of ESP32 on Baseboard

HC-SR05 (Sensor 1)

• TRIG: Connected to GPIO5 of ESP32 on Baseboard
• ECHO: Connected to GPIO17 of ESP32 on Baseboard
• VCC: Connected to 5V of ESP32 on Baseboard
• GND: Connected to GND of ESP32 on Baseboard

HC-SR05 (Sensor 2)

• TRIG: Connected to GPIO18 of ESP32 on Baseboard
• ECHO: Connected to GPIO19 of ESP32 on Baseboard
• VCC: Connected to 5V of ESP32 on Baseboard
• GND: Connected to GND of ESP32 on Baseboard

Code Documentation

ESP32 on Baseboard

#include <Servo.h>

Servo myservo;

const int trigPin1 = 18;
const int echoPin1 = 19;
const int trigPin2 = 5;
const int echoPin2 = 17;
const int servoPin = 23;

void setup() {
  Serial.begin(115200);
  
  // Servo setup
  myservo.attach(servoPin);
  
  // Sensor 1 setup
  pinMode(trigPin1, OUTPUT);
  pinMode(echoPin1, INPUT);
  
  // Sensor 2 setup
  pinMode(trigPin2, OUTPUT);
  pinMode(echoPin2, INPUT);
}

void loop() {
  // Read distance from sensor 1
  long duration1, distance1;
  digitalWrite(trigPin1, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin1, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin1, LOW);
  duration1 = pulseIn(echoPin1, HIGH);
  distance1 = (duration1 / 2) / 29.1;
  
  // Read distance from sensor 2
  long duration2, distance2;
  digitalWrite(trigPin2, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin2, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin2, LOW);
  duration2 = pulseIn(echoPin2, HIGH);
  distance2 = (duration2 / 2) / 29.1;
  
  // Print distances
  Serial.print("Distance 1: ");
  Serial.print(distance1);
  Serial.println(" cm");
  
  Serial.print("Distance 2: ");
  Serial.print(distance2);
  Serial.println(" cm");
  
  // Control servo based on distance1
  if (distance1 < 20) {
    myservo.write(90); // Rotate to 90 degrees
  } else {
    myservo.write(0); // Rotate to 0 degrees
  }
  
  delay(1000);
}

Micro Servo 9G

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

HC-SR05 (Sensor 1)

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

HC-SR05 (Sensor 2)

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}