Wireless remote control is becoming more and more widely used, such as wireless doorbells, wireless remote control cars, etc., and using a single-chip microcomputer to make a wireless remote control can become a very interesting DIY project. In this article, we will introduce how to use a microcontroller to implement a basic wireless remote control application.
First of all, we need to prepare the following materials:
- MCU: We can choose the Arduino Uno board based on ATmega328P (commonly used MCU board) to realize our project.
- Wireless chip: Here, we recommend the NRF24L01 2.4GHz radio transmission module as it is more convenient to use.
- Buttons: Used to control our app.
- Small microphone: used to receive our commands.
Now, let's start making the remote control.
The first step is to connect the circuit. Connect the Arduino Uno to your computer and plug the NRF24L01 wireless module into its designated slot. Next, connect the button and small microphone to the input port of the Arduino Uno and connect the power supply.
The second step is to write the code. Use the Arduino IDE to write the following code:
```
#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
RF24 radio(9, 10);
const byte address[6] = "00001";
void setup() {
radio.begin();
radio.openWritingPipe(address);
radio.setPALevel(RF24_PA_MIN);
}
void loop() {
if (digitalRead(button_pin) == HIGH) {
const char* message = "Hello world!";
radio.write(message, sizeof(message));
delay(1000);
}
}
``` This code implements a simple wireless remote control. When the button is pressed, the Arduino Uno sends a simple message to the wireless module with the message "Hello world!". You can add "Hello world!" Modified to control command.
The third step is to install the receiver. Connect the second Arduino Uno to your computer and plug the NRF24L01 wireless module into its designated slot. Connect the small microphone to the input port of the Arduino Uno and connect it to a power supply.
The fourth step is to write the code on the receiving end. Use the Arduino IDE to write the following code:
```
#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
#include <VirtualWire.h>
RF24 radio(9, 10);
const byte address[6] = "00001";
void setup() {
Serial.begin(9600);
radio.begin();
radio.openReadingPipe(0, address);
radio.setPALevel(RF24_PA_MIN);
radio.startListening();
}
void loop() {
if (radio.available()) {
char message[32];
radio.read(&message, 32);
Serial.println(message);
}
}
``` This code runs on a second Arduino Uno board. It sets up the receive pipeline and waits for the message to be received. When it receives a message, it prints the message to the serial window and gets the instruction.
The fifth step is to test the equipment. Press the button on the remote control and observe whether there is a message printing in the serial port window. If the remote successfully sends the message, the message can be seen in the receiver.
After completing the above steps, you have successfully created a microcontroller-based wireless remote control application. Of course, we have only implemented a simple control scheme so far, and you can try to develop other control instructions and update more complex control processes.
The microcontroller is a very interesting and fun thing. By learning how to make a microcontroller-based wireless remote control application, you can gain an in-depth understanding of how to use a microcontroller and thus better understand the program. At the same time, making a wireless remote control app can also bring all kinds of fun and challenges.
At last
Welcome to our Embedded Learning Group! As a member of this group, you will have the opportunity to network, share experiences and learning resources with professionals and enthusiasts in the field of embedded systems. The group covers a wide range of embedded system applications and developments, and whether you are a beginner or a seasoned professional, you will find like-minded partners and useful interactions here. Whether you are interested in the Internet of Things, smart home, industrial automation, etc., or want to share your own projects and experiences, our group will provide you with a broad communication platform.
More learning resources are here: Scan the QR code to receive information in the group