Daisy chain 74HC595 causes issues

[usman_ashraf678]

Paul,

Thanks for your input.

@Paul_B

You need to feed real 3.3 V to them from your ESP.

I have fed in 3.3V to power the SRs and its working fine.

@Paul_B

Something we have not discussed so far, but just what has been powering the ESP all this time?

It's the output of 7805.

@Paul_B

The better way to approach this was to use the 74HCT14 to buffer between your ESP and the shift registers.

Is this a formal level shifter or a 'NOT gate' used for buffering?

Is it safe to conclude that the problem was with the difference in input voltage standards at Vin of shift registers (5V) and clk.data signals (3.3V)?