fix pcf8574 setup

Author: thijstriemstra

Button_PCF8574/Button_PCF8574.cpp

@@ -13,12 +13,13 @@ Button_PCF8574::Button_PCF8574(
     Method callback
 ) {
   _btnPin = btn_pin;
-  _pcf = pcf;
+  _expander = pcf;
   _callback = callback;
   _lastBtnState = LOW;
 }
 
 void Button_PCF8574::begin() {
+  _expander->pinMode(_btnPin, INPUT);
 }
 
 void Button_PCF8574::loop() {

Button_PCF8574/Button_PCF8574.h

@@ -28,7 +28,7 @@ class Button_PCF8574
     int _currentBtnState;
     int _lastBtnState;
     Method _callback;
-    MultiPlexer_PCF8574* _pcf;
+    MultiPlexer_PCF8574* _expander;
     unsigned long _lastDebounceTime = 0;
     unsigned long _debounceDelay = 5;
 };

LED_PCF8574/LED_PCF8574.cpp

@@ -13,19 +13,19 @@ LED_PCF8574::LED_PCF8574(
   int led_state
 ) {
   _pin = pin;
-  _pcf = pcf;
+  _expander = pcf;
   state = led_state;
 }
 
 void LED_PCF8574::begin() {
-	_pcf->pinMode(_pin, OUTPUT);
+  _expander->pinMode(_pin, OUTPUT, state);
 }
 
 void LED_PCF8574::loop() {
 }
 
 void LED_PCF8574::update() {
-  _pcf->digitalWrite(_pin, state);
+  _expander->digitalWrite(_pin, state);
 }
 
 void LED_PCF8574::enable() {

LED_PCF8574/LED_PCF8574.h

@@ -29,7 +29,7 @@ class LED_PCF8574
     void update();
 
     int _pin;
-    MultiPlexer_PCF8574* _pcf;
+    MultiPlexer_PCF8574* _expander;
 };
 
 #endif

MultiPlexer_PCF8574/MultiPlexer_PCF8574.cpp

@@ -7,25 +7,13 @@
 
 #include <MultiPlexer_PCF8574.h>
 
-MultiPlexer_PCF8574::MultiPlexer_PCF8574(uint8_t address) {
-  _expander = new PCF8574(address);
+MultiPlexer_PCF8574::MultiPlexer_PCF8574(uint8_t address, uint8_t sda, uint8_t scl) {
+  _expander = new PCF8574(address, sda, scl);
 }
 
 void MultiPlexer_PCF8574::begin() {
   Serial.print("Initializing PCF8574... ");
 
-  /*
-  // inputs
-  int i = 0;
-  for (i = 0; i<4; i++) {
-    _expander->pinMode(i, INPUT);
-  }
-  // outputs
-  for (i=4; i<8; i++) {
-    _expander->pinMode(i, OUTPUT, LOW);
-  }
-  */
-
   if (_expander->begin()) {
     Serial.println("OK");
   } else{

MultiPlexer_PCF8574/MultiPlexer_PCF8574.h

@@ -14,14 +14,15 @@
 class MultiPlexer_PCF8574
 {
   public:
-    MultiPlexer_PCF8574(uint8_t address);
+    MultiPlexer_PCF8574(uint8_t address, uint8_t sda, uint8_t scl);
     void begin();
     void loop();
     void pinMode(uint8_t pin, uint8_t mode, uint8_t initialValue = HIGH);
     void digitalWrite(uint8_t pin, uint8_t value);
 
   private:
     PCF8574* _expander;
+
 };
 
 #endif