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pull/33/head
Raphaël Vinot 2015-07-04 22:39:54 +02:00
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doc/Daughterboard_schematic/README.md
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@ -25,21 +25,24 @@ Mechanical design
coordinate (0,0) is located at the PCB corner near the power supply connector.
the X axis is along the longest side.
hole_x1 = 3.50 ; // hole center x offset from PCB edge (uSD side)
LedBtn_y = device_y - hole_y - 2.5 * 2.54 + tolerance ; // Y axis center position of LEDs and button(s)
R_Led_x = hole_x1 + 29 + 2.54 + tolerance ; // X axis center position of red LED
Y_Led_x = R_Led_x - 3 * 2.54 ; // X axis center position of yellow LED
G_Led_x = R_Led_x - 6 * 2.54 ; // X axis center position of green LED
Btn_x = R_Led_x + 4.5 * 2.54 ; // X axis center position of button
* hole_x1 = 3.50 ; // hole center x offset from PCB edge (uSD side)
* LedBtn_y = device_y - hole_y - 2.5 * 2.54 + tolerance ; // Y axis center position of LEDs and button(s)
* R_Led_x = hole_x1 + 29 + 2.54 + tolerance ; // X axis center position of red LED
* Y_Led_x = R_Led_x - 3 * 2.54 ; // X axis center position of yellow LED
* G_Led_x = R_Led_x - 6 * 2.54 ; // X axis center position of green LED
* Btn_x = R_Led_x + 4.5 * 2.54 ; // X axis center position of button
The LEDs and the push-button are positioned on the 2.54 mm (0.1 inch) grid
Relative to he GPIO connector pin 1
along the X axis : -2 * 2.54 mm
along the Y axis (in multiples of 2.54 mm)
Green LED center : 4.5
Yellow LED center : 7.5
Red LED center : 10.5
Push-button center : 15.0
* along the X axis : -2 * 2.54 mm
* along the Y axis (in multiples of 2.54 mm)
* Green LED center : 4.5
* Yellow LED center : 7.5
* Red LED center : 10.5
* Push-button center : 15.0
The LEDs have a 3 mm diameter
The top of the LEDs are 11 mm above the PCB