Thanks for the information about the missing Resistor , perhaps I will try that , as It sounds like a similar issue .
1st I made the PCB on a BeardBoard with 1P12T switch and some tac switches as a test ,and it worked fine in MMJoy once you told me how to set the Button Mode to Switch On and the Timer to 100ms. So then I made a small PCB out of a dbl sided snappable Prototyping PCB (from BPS - the SB4) but I only used 2 '165 SR chips in 16 pin sockets as I only needed 16 extra buttons (not 24) on my FLCS. I then used solid core hookup wire to copy the traces on the back side and installed 10k and 0k resistors and Pins on the front side and it works fine in MMjoy too , (just like the BreadBoard version) , all 16 switches are seen in MMjoy as expected.
But when I connect it into the FLCS , either all 16 buttons disappear, 8 buttons disappear , or 8 buttons disappear and the other 8 flash on and off as I turn the Rotary switch..... almost like ghosting with no diodes but you shouldn't need them with a Shift Register, correct?. Perhaps I have bad or spiking power ? and should try other connection points or do you think it is the same issue you had and I need to add a 10k resistor like in your image ?
copy and pasted from my other post:
SCK is connected into a Common wire with the TLE5010 Boards' SCK and the Handle's 4021-S.R. PCB SCK PWR is common to the Pots and Switches etc GND is common to the Pots and Switches etc DATA is to F1 (assumed any PIN is OK or do I need a Digital Side Pin on the Leo? eg D4) ***Note DATA is also called MISO and that connecting the TLE5010 and Handle Miso/Data wires together (common) did not work -- the buttons disappeared CS is to F0 (assumed any PIN is OK or do I need a Digital Side Pin on the Leo? eg D4)
