Introduction - If you have any usage issues, please Google them yourself
NE555 hardware oscillator count experiments, 6-digit counter source, can be from 0 to 999 , NE555' s output P3.5 count, the boot shows digital data 0000000 p0, p2 digital control of the mouth, counting pulses NE555 P3. 5 NE555 output adjustment potentiometer, can be observed to count change, remove ne555 jumper, then stop counting