DS1820 Temperature sensor

Description
Dallas DS1820 temperature sensor with 1-wire interface..

Software functions

DS1820_RESET()  : Resets the DS1820. Returns 1 if DS1820
present, returns 0 if not present.

DS1820_READ_TEMPERATURE()    : Read temperature from
DS1820. Returns temperature data as 16 bit signed 
integer in 0.5 DegC increments. See table.

Temperature data relationship table.
+----------------------------+
| Temperature    | Data      |
+----------------------------+
|    +125 DegC   |   250     |
|    + 25 DegC   |    50     |
|    +1/2 DegC   |     1     |
|       0 DegC   |     0     |
|    -1/2 DegC   |    -1     |
|    - 25 DegC   |   -50     |
|    - 55 DegC   |  -110     |
+----------------------------+

Rotary encoder (8-bit count)

Description
Rotary encoder and 8-bit software up/down counter;

Software functions

ENC8_DO()     : call at regular intervals (faster than
anticipated pulse rate)
ENC8_COUNT    : output count 0 to 255