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Forum Index : Microcontroller and PC projects : Making Custom Characters on 16X2 LCD

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cosmic frog
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Joined: 09/02/2012
Location: United Kingdom
Posts: 302

Posted: 10:59am 15 Mar 2023

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Making Custom Graphics on 1602/2004 LCD

This will work on HD44780 KS0066 SPLC780 controller chips that have 1,2 or 4 lines of text.

The characters are made on a 5X8 grid.
Here is a custom character of a Bell.
16 8 4 2 1
1 * =4
2 * * * =14(8+4+2=14)
3 * * * =14
4 * * * =14
5 * * * * * =31(16+8+4+2+1=31)
6 =0
7 * =4
8 =0

There are 8 custom characters.
CHR$(0) has the command LCD CMD 64
CHR$(1) has the command LCD CMD 72
CHR$(2) has the command LCD CMD 80
CHR$(3) has the command LCD CMD 88
CHR$(4) has the command LCD CMD 96
CHR$(5) has the command LCD CMD 104
CHR$(6) has the command LCD CMD 112
CHR$(7) has the command LCD CMD 120

So to print the Bell character above use-
LCD CMD 64 : LCD DATA 4,14,14,14,31,0,4,0
LCD 1,1,CHR$(0)

To Print another custom character just use the next CHR$-
LCD CMD 72 : LCD DATA X,X,X,X,X,X,X,X
LCD 1,2,CHR$(1)

Remember if you are using the PicoMite to use BITBANG LCD.

Dave.

CaptainBoing

Guru

Joined: 07/09/2016
Location: United Kingdom
Posts: 2171

Posted: 01:16pm 15 Mar 2023

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worth adding, you only need to do

LCD CMD 64 : LCD DATA 4,14,14,14,31,0,4,0

once, (e.g. in the preamble) not each time you do the

LCD 1,1,CHR$(0)

jus' sayin'
Edited 2023-03-15 23:19 by CaptainBoing

cosmic frog
Guru

Joined: 09/02/2012
Location: United Kingdom
Posts: 302

Posted: 01:26pm 15 Mar 2023

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CaptainBoing said worth adding, you only need to do

LCD CMD 64 : LCD DATA 4,14,14,14,31,0,4,0

once, (e.g. in the preamble) not each time you do the

LCD 1,1,CHR$(0)

jus' sayin'

Good point.

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