pcf8574: set pins to LOW at startup

Author: thijstriemstra

MultiPlexer_PCF8574/MultiPlexer_PCF8574.cpp

@@ -8,8 +8,8 @@ MultiPlexer_PCF8574::MultiPlexer_PCF8574(uint8_t address, TwoWire* wire) {
   _expander = new PCF8574(address, wire);
 }
 
-bool MultiPlexer_PCF8574::begin() {
-  bool expanderReady = _expander->begin();
+bool MultiPlexer_PCF8574::begin(uint8_t value) {
+  bool expanderReady = _expander->begin(value);
   if (!expanderReady) {
     Log.warning(F("PCF8574 could not initialize!" CR));
   }

MultiPlexer_PCF8574/MultiPlexer_PCF8574.h

@@ -15,7 +15,7 @@ class MultiPlexer_PCF8574
 {
   public:
     MultiPlexer_PCF8574(uint8_t address, TwoWire* wire = &Wire);
-    bool begin();
+    bool begin(uint8_t value = LOW);
     bool isConnected();
     void digitalWrite(uint8_t pin, uint8_t value);
     uint8_t digitalRead(uint8_t pin);