Difference: RaspiElf (35 vs. 36)

Revision 362019-02-10 - PeterSchmid

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Wiring

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Diodes on Veroboard, additional Socket for EEPROM

The red wires are for the EEPROM

The Raspberry Pi ARM processor supply voltage is 3.3 V and the GPIOs are not 5 V tolerant. The Elf supply voltage is 5 V. This means that the GPIOs (input) have to be protected from Elf. The easiest way is to use diodes e.g. 1N4148 to protect the GPIOs from the 5 V, but the GPIOs need then pullup resistors. Thankfully the Raspi GPIOs have internal pullups and they can be controlled by software. The cathode has to be on the Elf side.

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D-Sub 25P male	523-L717SDBH25P
Header Connector 40 pol	571-4-215911-0
9 x 1N4148	512-1N4148

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Socket 6 pin

Veroboard Variant

Description	Mouser Part#
Veroboard
Flat Cable 40 conductors	517-3365/40FT
D-Sub 25P male for Flat Cable	571-1658613-2
2 x Header Connector 40 pol	571-4-215911-0
Header Connector 34 pol	571-3-215911-4
9 x 1N4148	512-1N4148
Socket 1x6 pin
Pin Header 40 pol	571-2-826925-0
Pin Header 34 pol	571-2-826925-0
DIL8 Socket, optional	571-2-1571552-2
100 nF Capacitor, optional
1N4148, optional	512-1N4148
25LC1024, optional	579-25LC1024-I/P

Cable

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