LCD Bargraph

[cyrildavids]

How do one configure this for a 4x 20 lcd screen with the same driver?

[mutthunaveen]

I am very much thankful to you

And I have a small problem with the display flickering is on the screen. It is something like scrolling effect... same as CRT interlacing.

What I have to modify to the code to get a clear display?

[Jeff7]

I think that a flickering effect like that can result from very rapid updates to the display. Either add in some kind of a delay, or else have a timer-triggered flag to enable an update, perhaps every 100-200mS.


Nifty bar graph...I didn't even see this thread.
I wound up digging up something on an old blog post, and made my own addition to LCD.c. I also tied the graph levels right to ASCII codes 0-7, so printf(lcd_putc,"%c",5); would result in printing a block with 6 rows filled in.
And of course you can program in something to check for a value greater than 7, decrement the value by 8, move to row 1, and print the new value. Badda-bing, you've got a 16-row bar, albeit with a small gap above the first 8 rows.

[mutthunaveen]

I thought the same. I mean increasing the delay (LCD refresh rate).

Thanks for your reply.

When I decrease the refresh rate then the interactive bar graph is struggling to display the sudden changes happening.

Anyway thanks

[mbradley]

Here is one from my site, works with the eadog driver, but you can tweek it to work with most any lcd that has custom chr's.

First call: gBarGraphIni(); to program the custom chr's.

Then call the graph function with a pos, max. This is what POS in MAX
so 50,100 would be half way, same as 256, 512.

gBarGraph(row,pos,max);

If you need a graph that does not span the entire row, then use the advanced one. WIDTH is the chr's positions wide.

gAdvBarGraph(row,col,width,pos,max)

[sandrosachser]

Hello. At first, thank you so much by informations. Is it possible use this bargraph code with LCD 20x4 ? (Note: I use FLEXLCD library) Thank you again.