https://lms.onnocenter.or.id/wiki/index.php?action=history&feed=atom&title=ESP32%3A_I2C_Scanner 2026-04-20T21:15:44Z Revision history for this page on the wiki MediaWiki 1.45.1 https://lms.onnocenter.or.id/wiki/index.php?title=ESP32:_I2C_Scanner&diff=68209&oldid=prev 2023-03-24T13:09:04Z

<p>Created page with &quot; /********* I2C Device ESP32 SDA SDA (default is GPIO 21) SCL SCL (default is GPIO 22) GND GND VCC usually 3.3V or 5V Rui Santo...&quot;</p> <p><b>New page</b></p><div> /*********<br /> <br /> I2C Device ESP32<br /> SDA SDA (default is GPIO 21)<br /> SCL SCL (default is GPIO 22)<br /> GND GND<br /> VCC usually 3.3V or 5V<br /> <br /> Rui Santos<br /> Complete project details at https://randomnerdtutorials.com <br /> *********/<br /> <br /> #include &lt;Wire.h&gt;<br /> <br /> void setup() {<br /> Wire.begin();<br /> Serial.begin(115200);<br /> Serial.println(&quot;\nI2C Scanner&quot;);<br /> }<br /> <br /> void loop() {<br /> byte error, address;<br /> int nDevices;<br /> Serial.println(&quot;Scanning...&quot;);<br /> nDevices = 0;<br /> for(address = 1; address &lt; 127; address++ ) {<br /> Wire.beginTransmission(address);<br /> error = Wire.endTransmission();<br /> if (error == 0) {<br /> Serial.print(&quot;I2C device found at address 0x&quot;);<br /> if (address&lt;16) {<br /> Serial.print(&quot;0&quot;);<br /> }<br /> Serial.println(address,HEX);<br /> nDevices++;<br /> }<br /> else if (error==4) {<br /> Serial.print(&quot;Unknow error at address 0x&quot;);<br /> if (address&lt;16) {<br /> Serial.print(&quot;0&quot;);<br /> }<br /> Serial.println(address,HEX);<br /> } <br /> }<br /> if (nDevices == 0) {<br /> Serial.println(&quot;No I2C devices found\n&quot;);<br /> }<br /> else {<br /> Serial.println(&quot;done\n&quot;);<br /> }<br /> delay(5000); <br /> }</div>

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