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PCF8574 - Revision history
2026-06-04T21:08:45Z
Revision history for this page on the wiki
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Chao at 12:08, 7 February 2020
2020-02-07T12:08:28Z
<p></p>
<p><b>New page</b></p><div><br />
== PCF8574 simple io write code ==<br />
* Default IIC address 0x20<br />
<source lang="arduino"><br />
#include "PCF8574.h"<br />
#include <Wire.h><br />
<br />
// adjust addresses if needed<br />
PCF8574 PCF_38(0x20); // add led to P0 (pin 4) (used as output)<br />
<br />
void setup()<br />
{<br />
//your setup code here<br />
}<br />
<br />
void loop()<br />
{<br />
//turn P0 (pin 4) of the I/O expander on and off once a second<br />
PCF_38.write(0, 1);<br />
delay(1000);<br />
PCF_38.write(0, 0);<br />
delay(1000);<br />
}<br />
</source><br />
<br />
<br />
[[category: IIC-IO]]</div>
Chao