掃瞄I²C設備的位址

下列程式是如果不知道手邊I²C設備的位址時，才需要下載至控制板中，

本程式是在掃瞄接在控制板上的I²C設備位址

1. #include "Wire.h"
2.  
3. void setup()
4. {
5.   Wire.begin();
6.   Serial.begin(9600);
7.   while (!Serial);             // Leonardo: wait for serial monitor
8.   Serial.println("nI2C Scanner");
9. }
10.  
11. void loop()
12. {
13.   byte error, address;
14.   int nDevices;
15.   Serial.println("Scanning...");
16.   nDevices = 0;
17.   for(address = 1; address < 127; address++ )
18.   {
19.     // The i2c_scanner uses the return value of
20.     // the Write.endTransmisstion to see if
21.     // a device did acknowledge to the address.
22.     Wire.beginTransmission(address);
23.     error = Wire.endTransmission();
24.  
25.     if (error == 0)
26.     {
27.       Serial.print("I2C device found at address 0x");
28.       if (address<16)
29.         Serial.print("0");
30.       Serial.print(address,HEX);
31.       Serial.println("  !");
32.       nDevices++;
33.     }
34.     else if (error==4)
35.     {
36.       Serial.print("Unknow error at address 0x");
37.       if (address<16)
38.         Serial.print("0");
39.       Serial.println(address,HEX);
40.     }    
41.   }
42.   if (nDevices == 0)
43.     Serial.println("No I2C devices foundn");
44.   else
45.     Serial.println("donen");
46.   delay(5000);           // wait 5 seconds for next scan
47. }