OneWirePD, Temp Monitoring

Connect up to 20 DS1820 to Mega16 on the same pin. Output temp(s). at serialport.:

01: 100008001EDF2110 23.0 C
00: 290008001EE05C10 22.9 C

The low level routine is written for 1MHz Int RC

AVR: Connect a pullup resistor 1K between Vcc and DQ-pin. (portA.7)

DS1820's: Connect Vcc to Gnd. (Parasitic power mode) and DQ to AVR