1  // SPDX-FileCopyrightText: 2021 Carter Nelson for Adafruit Industries
 2  // SPDX-FileCopyrightText: 2022 Kattni Rembor for Adafruit Industries
 3  //
 4  // SPDX-License-Identifier: MIT
 5  // --------------------------------------
 6  // PiCowbell Proto and Pico I2C scan code.
 7  //
 8  // Modified from https://playground.arduino.cc/Main/I2cScanner/
 9  // --------------------------------------
10  
11  #include <Wire.h>
12  
13  // Wire uses GPIO4 (SDA) and GPIO5 (SCL) automatically.
14  #define WIRE Wire
15  
16  void setup() {
17    WIRE.begin();
18  
19    Serial.begin(9600);
20    while (!Serial)
21       delay(10);
22    Serial.println("\nPiCowbell Proto Pico I2C Scanner");
23  }
24  
25  
26  void loop() {
27    byte error, address;
28    int nDevices;
29  
30    Serial.println("Scanning...");
31  
32    nDevices = 0;
33    for(address = 1; address < 127; address++ )
34    {
35      // The i2c_scanner uses the return value of
36      // the Write.endTransmission to see if
37      // a device did acknowledge the address.
38      WIRE.beginTransmission(address);
39      error = WIRE.endTransmission();
40  
41      if (error == 0)
42      {
43        Serial.print("I2C device found at address 0x");
44        if (address<16)
45          Serial.print("0");
46        Serial.print(address,HEX);
47        Serial.println("  !");
48  
49        nDevices++;
50      }
51      else if (error==4)
52      {
53        Serial.print("Unknown error at address 0x");
54        if (address<16)
55          Serial.print("0");
56        Serial.println(address,HEX);
57      }
58    }
59    if (nDevices == 0)
60      Serial.println("No I2C devices found\n");
61    else
62      Serial.println("done\n");
63  
64    delay(5000);           // wait 5 seconds for next scan
65  }