ESP32cam蓝牙模块与arduino uno通信实验
网上关于esp32cam与arduino通信的资料几乎没有,有的还得付费,于是自己动手琢磨,实验成功。 实验有多个版本,成功实现蓝牙收到数据后发送单个字符给arduino板,匹配到对应字符亮对应颜色的灯,发送字符串可以此类推。 实验材料,接线方式在下图可以看到: 需要下载一个蓝牙串口助手,应用商店里很容易找到。
arduino uno上传代码(接收单字符):
int i ; void setup() { Serial.begin(115200); pinMode(2, OUTPUT); pinMode(3, OUTPUT); pinMode(4, OUTPUT); } void loop() { if (Serial.available()) { // Serial.write(Serial.read());//输出原数据格式 i = Serial.read(); // Serial.println(i);//输出可显示的ascll值 Serial.write(i); Serial.write( ); } if (i == a) { digitalWrite(2, HIGH); } if (i == b) { digitalWrite(3, HIGH); } if (i == c) { digitalWrite(4, HIGH); } }
arduino上传代码(接收字符串):
String itext = "" ; void setup() { Serial.begin(115200); pinMode(2, OUTPUT); pinMode(3, OUTPUT); pinMode(4, OUTPUT); } String detectString(); String gettext(); void loop() { if (Serial.available()) { // Serial.write(Serial.read()); itext = gettext(); // Serial.println(i); Serial.println(itext); } if (itext == "blue") { digitalWrite(2, HIGH); } if (itext == "green") { digitalWrite(3, HIGH); } if (itext == "red") { digitalWrite(4, HIGH); } } //======接收esp32cam数据=========================== String detectString() //删除传输格式 { while(Serial.read() != {); return(Serial.readStringUntil(})); } String gettext() //得到数据 { String s = detectString(); return s; }
esp32cam上传代码:
//This example code is in the Public Domain (or CC0 licensed, at your option.) //By Evandro Copercini - 2018 // //This example creates a bridge between Serial and Classical Bluetooth (SPP) //and also demonstrate that SerialBT have the same functionalities of a normal Serial #include "BluetoothSerial.h" #if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED) #error Bluetooth is not enabled! Please run `make menuconfig` to and enable it #endif BluetoothSerial SerialBT; char i; void setup() { Serial.begin(115200); SerialBT.begin("ESP32test"); //Bluetooth device name Serial.println("The device started, now you can pair it with bluetooth!"); } void loop() { // 蓝牙助手发送数据到arduino uno if (SerialBT.available()) { while (SerialBT.available()) { // Serial.write(SerialBT.read()); i = SerialBT.read();//一个字符一个字符读取,读一个就少一个 Serial.print(i);//发送数据到arduino uno } } }
两个实验接收数据显示图: (1)单字符 (2)字符串