https://w.electrodragon.com/w/index.php?action=history&feed=atom&title=Category%3AIO_Expander 2026-07-24T11:53:38Z Revision history for this page on the wiki MediaWiki 1.37.2 https://w.electrodragon.com/w/index.php?title=Category:IO_Expander&diff=25064&oldid=prev 2020-02-05T12:37:32Z

<p></p> <p><b>New page</b></p><div>* [[:FIle:PCF8574.pdf|PCF8574]] / PCF8575 - I2C - common used for [[1602]]<br /> * MCP23008 - I2C - 8-Bit I/O Expander with Serial Interface, - [[:File:Mcp23008_library.zip|arduino library]]<br /> * MCP23017 - I2C - 16-Bit I/O Expander with Serial Interface,<br /> <br /> <br /> == PCF8575 Demo Code ==<br /> Use Wire.write(B00000000); to write value to the pins.<br /> &lt;syntaxhighlight lang=&quot;Arduino&quot;&gt;<br /> #include &lt;Wire.h&gt;<br /> <br /> byte address = 0x20; // address of PCF8575 with A0-A2 connected to GND &quot;B01000000&quot;<br /> byte input; // variable to receive the two bytes<br /> byte c; // first of the two bytes to read<br /> byte d; // second of the two bytes to read<br /> int led = 13;<br /> <br /> void setup()<br /> {<br /> Wire.begin(); // join i2c bus <br /> Serial.begin(9600); // used to Debug , Thanks PaulS<br /> pinMode(led, OUTPUT);<br /> }<br /> <br /> void loop(){<br /> <br /> <br /> input = Wire.requestFrom(0x20,2);<br /> <br /> c = Wire.read();<br /> d = Wire.read();<br /> Wire.endTransmission();<br /> <br /> if(bitRead(d,6) == 0) {<br /> digitalWrite(led, LOW); <br /> delay(1000);<br /> }<br /> else {<br /> digitalWrite(13, HIGH);<br /> }<br /> Serial.println(c, BIN); <br /> delay(100);<br /> Serial.println(d,BIN); <br /> <br /> } // send the data<br /> &lt;/syntaxhighlight&gt; <br /> == Demo code ==<br /> * PCF8574 C51, avr, stm8 demo code - [[File:PCF8574-IO-Expansion-Board-code.zip]]<br /> [[category:Bridge Interface]]</div>

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