Hi to all!
Got a "little" problem. When PIC 18F4550 sends data to 2x16 LCD, +5V line gets noise (attached picture).
PIC is decoupled with 100nF/10uF, LCD also. Tried adding PI filter and ferrite beads, no good.
LCD is connected via ribbon cable, length is about 10 cm. Sorry, I have no pictures.
Built on protoboard (soldered). Similar noise is present at the battery pack terminals.
It is not bad probing, noise is real.
Power is supplied from 9V battery pack and is regulated down to 5V by LF50CV.
This level of noise is not a problem generally, but for analog part of electronics is making
a lots of trouble.
Anyone have any ideas how this can be solved? Please suggest some good filter, so
I can power the analog part from the same battery pack.
Thanks!
TxeSci