// // FILE: PCF8574_isConnected.ino // AUTHOR: Rob Tillaart // DATE: 2021-01-03 // PUPROSE: demo isConnected function #include "PCF8574.h" // adjust addresses if needed PCF8574 PCF_39(0x39); void setup() { Serial.begin(115200); Serial.println(__FILE__); Serial.print("PCF8574_LIB_VERSION:\t"); Serial.println(PCF8574_LIB_VERSION); if (!PCF_39.begin()) { Serial.println("could not initialize..."); } if (!PCF_39.isConnected()) { Serial.println("=> not connected"); } else { Serial.println("=> connected!!"); } } void loop() { } // -- END OF FILE --