Circlean/doc/Daughterboard_schematic

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