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docs: Add "will heaters be turned off on a crash" item to FAQ 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Kevin O'Connor 2018-03-13 11:26:15 -04:00
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1 changed files with 13 additions and 1 deletions
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docs/FAQ.md
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@ -10,7 +10,8 @@ Frequently asked questions
7. [Why is the Z position_endstop set to 0.5 in the default configs?](#why-is-the-z-position_endstop-set-to-05-in-the-default-configs) 7. [Why is the Z position_endstop set to 0.5 in the default configs?](#why-is-the-z-position_endstop-set-to-05-in-the-default-configs)
8. [I converted my config from Marlin and the X/Y axes work fine, but I just get a screeching noise when homing the Z axis](#i-converted-my-config-from-marlin-and-the-xy-axes-work-fine-but-i-just-get-a-screeching-noise-when-homing-the-z-axis) 8. [I converted my config from Marlin and the X/Y axes work fine, but I just get a screeching noise when homing the Z axis](#i-converted-my-config-from-marlin-and-the-xy-axes-work-fine-but-i-just-get-a-screeching-noise-when-homing-the-z-axis)
9. [When I set "restart_method=command" my AVR device just hangs on a restart](#when-i-set-restart_methodcommand-my-avr-device-just-hangs-on-a-restart) 9. [When I set "restart_method=command" my AVR device just hangs on a restart](#when-i-set-restart_methodcommand-my-avr-device-just-hangs-on-a-restart)
10. [How do I upgrade to the latest software?](#how-do-i-upgrade-to-the-latest-software) 10. [Will the heaters be left on if the Raspberry Pi crashes?](#will-the-heaters-be-left-on-if-the-raspberry-pi-crashes)
11. [How do I upgrade to the latest software?](#how-do-i-upgrade-to-the-latest-software)
### How do I calculate the step_distance parameter in the printer config file? ### How do I calculate the step_distance parameter in the printer config file?
@ -199,6 +200,17 @@ bootloader is a one time step that typically requires an external
programmer - search the web to find the instructions for your programmer - search the web to find the instructions for your
particular device. particular device.
### Will the heaters be left on if the Raspberry Pi crashes?
The software has been designed to prevent that. Once the host enables
a heater, the host software needs to confirm that enablement every 5
seconds. If the micro-controller does not receive a confirmation every
5 seconds it goes into a "shutdown" state which is designed to turn
off all heaters and stepper motors.
See the "config_digital_out" command in the
[MCU commands](MCU_Commands.md) document for further details.
### How do I upgrade to the latest software? ### How do I upgrade to the latest software?
The general way to upgrade is to ssh into the Raspberry Pi and run: The general way to upgrade is to ssh into the Raspberry Pi and run: