Shift Register Demo Board

This is a story about creating a demo board for working with shift registers.

1. first create the circuit board
2. demo on Arduino platform as a single, 8 bit shift register
3. expand demo board to use multiple SR, iterative with software development
4. when hardware is operational port the software to STM8 platform and Cypress board

Notes about creating the circuit board for the shift reg (demo)

1. the 7 segment(7S) displays are common -cathode
2. the common connections are to pins 3 & 8
3. pins 3 & 8 are opposite each other which makes construction on strip board (aka Veroboard) easy
4. pin 1 of the 7 segment displays is bottom left as viewed from above (LED visible side)
5. the current limit resistors are in DIL packs
6. 20 pin DIL sockets available for the resistors and shiftRegister ICs
7. Four (7S) displays were needed and had to be hosted in sockets -one large socket was used sideways
8. the outputs of the shiftReg IC 74HC595 are mostly on the LHS and in sequence