init(address,sr,pga);



address = 0x68;  // MCP3421 device address

sr= Sample Rate Selection
sr=0 ; 00 = 240 SPS (12 bits)
sr=1 ; 01 = 60 SPS (14 bits)

sr=2 ; 10 = 15 SPS (16 bits)
sr=3 ; 11 = 3.75 SPS (18 bits)

 

pga= PGA Gain Selector
0 = 1 V/V
1 = 2 V/V 
2 = 4 V/V
3 = 8 V/V

 

int ready()
// returns 1 when conversion is ready

 

long getLong()
// returns conversion result as long number

 

double getDouble()
// returns  voltage as double/float number