#include <PCF8574.h>
PCF8574 pcf20(0x20);
void setup() {
Serial.begin(115200);
Serial.print("PCF8574_LIB_VERSION:\t");
Serial.println(PCF8574_LIB_VERSION);
if (!pcf20.begin()) {
Serial.println("Chip not responding.");
}
if (!pcf20.isConnected()) {
Serial.println("could not initialize... => not connected");
while (1);
}
uint8_t value = pcf20.read8();
Serial.print("0x20 read: ");
Serial.println(value, HEX);
}
void loop() {
for (int i = 0; i < 255; i++) {
pcf20.write8(i);
uint8_t value = pcf20.read8();
Serial.print("0x20 read: ");
Serial.println(value, HEX);
delay(100);
}
pcf20.write(0, 1);
for (int i = 0; i < 7; i++) {
pcf20.shiftLeft();
delay(100);
}
for (int i = 0; i < 7; i++) {
pcf20.shiftRight();
delay(100);
}
for (int i = 0; i < 8; i++) {
pcf20.write(i, 1);
delay(100);
pcf20.write(i, 0);
delay(100);
}
for (int i = 0; i < 8; i++) {
pcf20.toggle(i);
delay(100);
pcf20.toggle(i);
delay(100);
}
// Echo the state of the lines on the other PCF
uint8_t value = pcf20.read8();
pcf20.write8(value);
delay(100);
}