2015-02-20 20:37:35 +01:00
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Daughter board schematic
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========================
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Note
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======
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the schematic has been created using GNU gEDA
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Bill of material
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================
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Part list
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- 3mm diameter low power LED Green
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- 3mm diameter low power LED Yellow
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- 3mm diameter low power LED Red
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- PCB mounted SPST normally open push-button
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- 26 (or 40) DIL poles pin-header female connector
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- resistors (values are not critical)
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510 Ohm (3)
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16 KOhm
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1.3 KOhm
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Mechanical design
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=================
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coordinate (0,0) is located at the PCB corner near the power supply connector.
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the X axis is along the longest side.
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2015-07-04 22:39:54 +02:00
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* hole_x1 = 3.50 ; // hole center x offset from PCB edge (uSD side)
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* LedBtn_y = device_y - hole_y - 2.5 * 2.54 + tolerance ; // Y axis center position of LEDs and button(s)
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* R_Led_x = hole_x1 + 29 + 2.54 + tolerance ; // X axis center position of red LED
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* Y_Led_x = R_Led_x - 3 * 2.54 ; // X axis center position of yellow LED
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* G_Led_x = R_Led_x - 6 * 2.54 ; // X axis center position of green LED
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* Btn_x = R_Led_x + 4.5 * 2.54 ; // X axis center position of button
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2015-02-20 20:37:35 +01:00
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The LEDs and the push-button are positioned on the 2.54 mm (0.1 inch) grid
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2015-07-04 22:39:54 +02:00
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2015-02-20 20:37:35 +01:00
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Relative to he GPIO connector pin 1
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2015-07-04 22:39:54 +02:00
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* along the X axis : -2 * 2.54 mm
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* along the Y axis (in multiples of 2.54 mm)
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* Green LED center : 4.5
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* Yellow LED center : 7.5
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* Red LED center : 10.5
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* Push-button center : 15.0
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2015-02-20 20:37:35 +01:00
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The LEDs have a 3 mm diameter
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The top of the LEDs are 11 mm above the PCB
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