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RPI operates ARDUINO PID control

prior info
now we have a arduino UNO / Leonardo with a PID control
PV by DALLAS one wire temperatur sensor
OUTPUT by a servo positioner

and a RPI with a python service program what talks to ARDUINO
- mode ( 0 safe, (1 interlock), 2 MAN, 3 AUTO, ( 4 CAS ), 5 RSP
- MOUT output for MAN mode
- RSP setpoint for RSP mode
and gets his reported PV, SP, OUTPUT, MODE
and sends it to a google spreadsheet ( as historic data collection )