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This is a DS1620 working and tested driver, use it as you like.

#define DS1620_dq PIN_A0 // DS1620 DQ
#define DS1620_clk PIN_A1 // DS1620 CLK
#define DS1620_rst PIN_A2 // DS1620 RST
...

//
// This code setup the MCP3421 in 18bits mode and then enters
// a loop that continually reads and display the value read on
// a 2x20 character LCD.
//
// Use it as a starting point for your ...