Using a Alphanumeric LCD EB005 on a long lead

For E-blocks user to discuss using E-blocks and programming for them.

Moderators: Benj, Mods

User avatar
Matrix Staff
Posts: 14567
Joined: Mon Oct 16, 2006 10:48 am
Location: Matrix TS Ltd
Has thanked: 4598 times
Been thanked: 4239 times

Using a Alphanumeric LCD EB005 on a long lead

Postby Benj » Mon May 17, 2010 12:05 pm

A LCD on a long cable will probably have severe corruption of data due to the connections starting to have the characteristics of a transmission line. That is resistance, inductance and capacitance start to play a role and signals start to be reflected without correct termination.

- 10k pull down resistors on the pic side and on the lcd side,
- 80 ohm resisters in series with all the data lines on the lcd side , eliminate ''reflection'
- DB 15 ribbon cable with a GND line in-between separating each data line ,to eliminate ''cross talk''.

This enabled the LCD to run on a 2m ribbon cable perfectly.
These users thanked the author Benj for the post (total 2):
Enamul (Sat Sep 01, 2012 10:39 am) • petesmart (Sat Sep 01, 2012 10:55 pm)
Rating: 10.53%