arduino Nano和nodeMCU的I2C通信
本帖最后由 anhezhou 于 2019-5-26 18:21 编辑接线方式
nodeMCU作为主机
#include <Wire.h>
void setup() {
Serial.begin(9600); /* begin serial for debug */
Wire.begin(D1, D2); /* join i2c bus with SDA=D1 and SCL=D2 of NodeMCU */
}
void loop() {
Wire.beginTransmission(8); /* begin with device address 8 */
Wire.write("Hello Arduino");/* sends hello string */
Wire.endTransmission(); /* stop transmitting */
Wire.requestFrom(8, 13); /* request & read data of size 13 from slave */
while(Wire.available()){
char c = Wire.read();
Serial.print(c);
}
Serial.println();
delay(1000);
}
从机Nano程序：#include <Wire.h>
void setup() {
Wire.begin(8); /* join i2c bus with address 8 */
Wire.onReceive(receiveEvent); /* register receive event */
Wire.onRequest(requestEvent); /* register request event */
Serial.begin(9600); /* start serial for debug */
}
void loop() {
delay(100);
}
// function that executes whenever data is received from master
void receiveEvent(inthowMany) {
while (0 <Wire.available()) {
char c = Wire.read(); /* receive byte as a character */
Serial.print(c); /* print the character */
}
Serial.println(); /* to newline */
}
// function that executes whenever data is requested from master
void requestEvent() {
Wire.write("Hello NodeMCU");/*send string on request */
}
编译通不过啊
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