想要知道硬體電路的I2C的ADDRESS就必須看datasheet或是上網查,但有些東西真的很難找
透過這個範例就可以快速知道硬體的I2C地址了
首先先根據你的硬體將Vcc及GND接上
硬體的SCL請接在ESP32的G22
硬體的SDA請接在ESP32的G21
這是預設的I2C接腳
程式碼:
#include <Wire.h>
void setup() {
Wire.begin();
Serial.begin(115200);
Serial.println("\nI2C Scanner");
}
void loop() {
byte error, address;
int nDevices;
Serial.println("Scanning...");
nDevices = 0;
for(address = 1; address < 127; address++ ) {
Wire.beginTransmission(address);
error = Wire.endTransmission();
if (error == 0) {
Serial.print("I2C device found at address 0x");
if (address<16) {
Serial.print("0");
}
Serial.println(address,HEX);
nDevices++;
}
else if (error==4) {
Serial.print("Unknow error at address 0x");
if (address<16) {
Serial.print("0");
}
Serial.println(address,HEX);
}
}
if (nDevices == 0) {
Serial.println("No I2C devices found\n");
}
else {
Serial.println("done\n");
}
delay(5000);
}
顯示結果如下可以知道該硬體的位址為0X3F