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docs: Add additional information to FAQ on heater checks 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Kevin O'Connor 2018-04-09 22:00:26 -04:00
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docs/FAQ.md
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@ -216,6 +216,19 @@ off all heaters and stepper motors.
See the "config_digital_out" command in the
[MCU commands](MCU_Commands.md) document for further details.
In addition, the micro-controller software is configured with a
minimum and maximum temperature range for each heater at startup (see
the min_temp and max_temp parameters in the
[example.cfg](../config/example.cfg) file for details). If the
micro-controller detects that the temperature is outside of that range
then it will also enter a "shutdown" state.
Separately, the host software also implements code to check that
heaters and temperature sensors are functioning correctly. See the
"verify_heater" section of the
[example-extras.cfg](../config/example-extras.cfg) for further
details.
### How do I upgrade to the latest software?
The general way to upgrade is to ssh into the Raspberry Pi and run: