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Author: jumbokh

Lab-MPU6050/i2cScanner.ino

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+// ESP32 I2C Scanner
+// Based on code of Nick Gammon  http://www.gammon.com.au/forum/?id=10896
+// ESP32 DevKit - Arduino IDE 1.8.5
+// Device tested PCF8574 - Use pullup resistors 3K3 ohms !
+// PCF8574 Default Freq 100 KHz 
+
+#include <Wire.h>
+
+void setup()
+{
+  Serial.begin (115200);  
+  Wire.begin (21, 22);   // sda= GPIO_21 /scl= GPIO_22
+}
+
+void Scanner ()
+{
+  Serial.println ();
+  Serial.println ("I2C scanner. Scanning ...");
+  byte count = 0;
+
+  Wire.begin();
+  for (byte i = 8; i < 120; i++)
+  {
+    Wire.beginTransmission (i);          // Begin I2C transmission Address (i)
+    if (Wire.endTransmission () == 0)  // Receive 0 = success (ACK response) 
+    {
+      Serial.print ("Found address: ");
+      Serial.print (i, DEC);
+      Serial.print (" (0x");
+      Serial.print (i, HEX);     // PCF8574 7 bit address
+      Serial.println (")");
+      count++;
+    }
+  }
+  Serial.print ("Found ");      
+  Serial.print (count, DEC);        // numbers of devices
+  Serial.println (" device(s).");
+}
+
+void loop()
+{
+  Scanner ();
+  delay (100);
+}