Circlean/doc/Daughterboard_schematic
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