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add motor enable details #2

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add motor enable details #2

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8 changes: 6 additions & 2 deletions hardware.md
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Original file line number Diff line number Diff line change
Expand Up @@ -25,12 +25,13 @@ PD2 | LCD backlight control
PD3 | LCD backlight control
PD5 | UART TX
PD6 | UART RX
PD7 | Soft power latch
PD7 | Soft power latch / Motor Enable (White wire)
PE5 | LCD data DB7

## Power supply / control
* soft power latch
* The supply voltage from the battery is switched via a [transistor](/images/latch-transistor.jpg).
* It feeds the Motor Enable (White wire)
* It is activated while pressing the power button.
* The microcontroller has to set its pin PD7 to HIGH so it stays on when the button is no more pressed
* buck regulator 12V for the needs of the LCD Backlight
Expand All @@ -55,5 +56,8 @@ PE5 | LCD data DB7
* capacitors for debouncing(?)

## Grip hallsensor
* Rotation state of the grip is detected by a hallsensor
* Rotation state of the grip is detected by [analog hallsensor SS49E](https://sensing.honeywell.com/SS49E-linear-and-angle-sensor-ics)
* [SS49E](/images/hallsensor.jpg) connected to analog input via a RC filter

## Brake Wire
* Unconnected wire tail