a si si scusa 
stavo dimenticando avevo fatto due prove ma non riesco a caricarlo mi da errore
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:24:26: error: WConstants.h: No such file or directory
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp: In constructor 'Sensirion::Sensirion(uint8_t, uint8_t)':
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:82: error: 'OUTPUT' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:82: error: 'pinMode' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp: In member function 'uint8_t Sensirion::meas(uint8_t, uint16_t*, bool)':
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:131: error: 'digitalRead' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:135: error: 'delay' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp: In member function 'uint8_t Sensirion::measRdy()':
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:147: error: 'digitalRead' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp: In member function 'uint8_t Sensirion::putByte(uint8_t)':
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:235: error: 'OUTPUT' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:235: error: 'pinMode' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:238: error: 'digitalWrite' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:239: error: 'delayMicroseconds' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:240: error: 'HIGH' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:242: error: 'LOW' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:246: error: 'INPUT' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:248: error: 'digitalWrite' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:250: error: 'HIGH' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:251: error: 'delayMicroseconds' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:252: error: 'digitalRead' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:255: error: 'LOW' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp: In member function 'uint8_t Sensirion::getByte(bool)':
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:265: error: 'HIGH' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:265: error: 'digitalWrite' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:266: error: 'delayMicroseconds' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:267: error: 'digitalRead' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:268: error: 'LOW' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:271: error: 'OUTPUT' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:271: error: 'pinMode' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:272: error: 'digitalWrite' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:273: error: 'delayMicroseconds' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:274: error: 'HIGH' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:276: error: 'LOW' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:278: error: 'INPUT' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp: In member function 'void Sensirion::startTransmission()':
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:298: error: 'HIGH' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:298: error: 'digitalWrite' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:299: error: 'OUTPUT' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:299: error: 'pinMode' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:300: error: 'delayMicroseconds' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:303: error: 'LOW' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp: In member function 'void Sensirion::resetConnection()':
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:325: error: 'HIGH' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:325: error: 'digitalWrite' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:326: error: 'OUTPUT' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:326: error: 'pinMode' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:327: error: 'delayMicroseconds' was not declared in this scope
/Users/marco/Documents/Arduino/libraries/Sensirion/Sensirion.cpp:331: error: 'LOW' was not declared in this scope
la libreria me l'ha caricata correttamente ma quando eseguo l'esempio ho tutta questa serie di errori...
comunque io odio usare librerie voglio capirle e conoscere a fondo quello che devo fare ... dato che è per il progetto d'esami non posso andare li e dirli "si ho fatto tutto con librerie ma non chiedetemi come funzione" 