History

mdurvaux c0d987042b Electrical and mechanical design documentation added : daughter board schematic, BOM, case design documentation and manufacturing files (3D printing)		2015-02-20 20:37:35 +01:00
..
README.md	Electrical and mechanical design documentation	2015-02-20 20:37:35 +01:00
Raspi_IO.pdf	Electrical and mechanical design documentation	2015-02-20 20:37:35 +01:00
Raspi_IO.sch	Electrical and mechanical design documentation	2015-02-20 20:37:35 +01:00

README.md

Daughter board schematic

Note

the schematic has been created using GNU gEDA

Bill of material

Part list

3mm diameter low power LED Green
3mm diameter low power LED Yellow
3mm diameter low power LED Red
PCB mounted SPST normally open push-button
26 (or 40) DIL poles pin-header female connector
resistors (values are not critical) 510 Ohm (3) 16 KOhm 1.3 KOhm

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

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

The LEDs have a 3 mm diameter The top of the LEDs are 11 mm above the PCB