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Revision to Using servos and controlling unused IO pins

Tony

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| Disable the heater using M307 H# A-1 C-1 D-1 to make the pin available, where # is the heater number, and make sure that no tool is configured to use that heater. The outputs on the expansion connector are active low with 3.3V signal level. On the DueX5 expansion board, heater channels 3-7 are available as 5V active-high signals on the PWM1 - PWM5 connectors respectively. On the DueX2,DueX2 from version 0.8a onwards, heater channels 3-7 are available on PWM1 - PWM5, prior to that heater channels 3-5 only are available on PWM1 - PWM3PWM3 . Caution: the heater output terminals will also be driven by the PWM signal or servo pulses.
| Disable the heater using M307 H# A-1 C-1 D-1 to make the pin available, where # is the heater number, and make sure that no tool is configured to use that heater. The outputs on the expansion connector are active low with 3.3V signal level. On the DueX5 expansion board, heater channels 3-7 are available as 5V active-high signals on the PWM1 - PWM5 connectors respectively. On the DueX2,DueX2 from version 0.8a onwards, heater channels 3-7 are available on PWM1 - PWM5, prior to that heater channels 3-5 only are available on PWM1 - PWM3PWM3 . Caution: the heater output terminals will also be driven by the PWM signal or servo pulses.
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| 20-27

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