Your column 5 doesn't work simply because PortA.4 is a Schmitt Trigger
input and an open drain output. You will need an additional NPN transistor with a pull down resistor to make column 5 working....
Type: Posts; User: aratti; Keyword(s):
Your column 5 doesn't work simply because PortA.4 is a Schmitt Trigger
input and an open drain output. You will need an additional NPN transistor with a pull down resistor to make column 5 working....