Arduino Nano 33 IoT - Ultrasonic Sensor - Servo Motor
This guide shows you how to use the Arduino Nano 33 IoT with a potentiometer to control a servo motor. Here are the details:
- The Arduino Nano 33 IoT turns a servo motor to 90° when an object is close to the ultrasonic sensor.
- The Arduino Nano 33 IoT turns the servo motor back to 0° when an object is far from the ultrasonic sensor.
Hardware Preparation
Or you can buy the following sensor kits:
| 1 | × | DIYables Sensor Kit (30 sensors/displays) | |
| 1 | × | DIYables Sensor Kit (18 sensors/displays) |
Disclosure: Some of the links provided in this section are Amazon affiliate links. We may receive a commission for any purchases made through these links at no additional cost to you.
Additionally, some of these links are for products from our own brand, DIYables .
Additionally, some of these links are for products from our own brand, DIYables .
Overview of Servo Motor and Ultrasonic Sensor
If you're new to using the Servo Motor, Ultrasonic Sensor, and Arduino Nano 33 IoT, please check out these tutorials:
These tutorials explain how Servo Motor and Ultrasonic Sensor work, their pinouts, how to connect them to the Arduino Nano 33 IoT, and how to program Arduino Nano 33 IoT to work with the Servo Motor and Ultrasonic Sensor.
Wiring Diagram
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Arduino Nano 33 IoT Code - Ultrasonic Sensor Controls Servo Motor
/*
* This Arduino Nano 33 IoT code was developed by newbiely.com
*
* This Arduino Nano 33 IoT code is made available for public use without any restriction
*
* For comprehensive instructions and wiring diagrams, please visit:
* https://newbiely.com/tutorials/arduino-nano-iot/arduino-nano-33-iot-ultrasonic-sensor-servo-motor
*/
#include <Servo.h>
#define TRIG_PIN 5 // The Arduino Nano 33 IoT pin connected to Ultrasonic Sensor's TRIG pin
#define ECHO_PIN 4 // The Arduino Nano 33 IoT pin connected to Ultrasonic Sensor's ECHO pin
#define SERVO_PIN 2 // The Arduino Nano 33 IoT pin connected to Servo Motor's pin
#define DISTANCE_THRESHOLD 50 // centimeters
Servo servo; // create servo object to control a servo
// variables will change:
float duration_us, distance_cm;
void setup() {
Serial.begin (9600); // initialize serial port
pinMode(TRIG_PIN, OUTPUT); // set Arduino Nano 33 IoT pin to output mode
pinMode(ECHO_PIN, INPUT); // set Arduino Nano 33 IoT pin to input mode
servo.attach(SERVO_PIN); // attaches the servo on pin 9 to the servo object
servo.write(0);
}
void loop() {
// generate 10-microsecond pulse to TRIG pin
digitalWrite(TRIG_PIN, HIGH);
delayMicroseconds(10);
digitalWrite(TRIG_PIN, LOW);
// measure duration of pulse from ECHO pin
duration_us = pulseIn(ECHO_PIN, HIGH);
// calculate the distance
distance_cm = 0.017 * duration_us;
if (distance_cm < DISTANCE_THRESHOLD)
servo.write(90); // rotate servo motor to 90 degree
else
servo.write(0); // rotate servo motor to 0 degree
// print the value to Serial Monitor
Serial.print("distance: ");
Serial.print(distance_cm);
Serial.println(" cm");
delay(500);
}
Detailed Instructions
If you are new to the Arduino Nano 33 IoT, be sure to check out our Getting Started with Arduino Nano 33 IoT tutorial. Then, follow these steps:
- Connect the components to the Arduino Nano 33 IoT board as depicted in the diagram.
- Use a USB cable to connect the Arduino Nano 33 IoT board to your computer.
- Launch the Arduino IDE on your computer.
- Select the Arduino Nano 33 IoT board and choose its corresponding COM port.
- Copy the code above and paste it into the Arduino IDE.
- Click the Upload button to compile and send the code to your Arduino Nano 33 IoT board.
- Place your hand in front of the sensor.
- Watch the servo motor move.