BL0032 20x4 liniers LCD display with I2C

[Monie Jacobsen]

Hello everyone
User: BL0032 - 16-Bit dsPIC

How do I get 20x4 liniers LCD display (HD44780) Module with I2C to work with BL0032?

Please see here: https://nettigo.eu/products/lcd-4x20-i2c-blue

Attach test code:

BL0032_Display4x20_I2C.fcfx

(8.07 KiB) Downloaded 205 times

[Benj]

Hi Monie,

It looks like that display uses the PCF8574 IO expander to drive it. So you will likely need to use this component instead.

Display.jpg (52.21 KiB) Viewed 3622 times

I beleive the backpack component uses the MCP23017 IO expander instead.

[Monie Jacobsen]

Hi Benj
Have tried PCF8574 IO expander to drive
Also tried MCP23017 IO expander instead
But can not get LCD I2C (Backpack) to work.
Do you have a suggestion?

Attachment file:

BL0032_Display4x20_I2C.fcfx

(9.36 KiB) Downloaded 213 times

[Benj]

Hi Monie,

Have you tried the component I highlighted in the screenshot - LCD I2C (LCM1602)?

This has the PCF8574 code built into it. If this isn't working then do you have any example code to work from that I can compare with the component.

[Monie Jacobsen]

Hi Benj
I've been trying as you suggested, but without the hassle of anything on display.
User LCD I2C (LCM1602)...
Please refer to the codes below!
Do you want to help with a code example like writing for display whole to LCD 20x4
Display connect to PORTF / C. Or do you have another suggestion?
See attachment:

BL0032_Display4x20_I2C.fcfx

(9.93 KiB) Downloaded 198 times

[Jan Lichtenbelt]

Hi Monie,

Try to add a delay of at least 300 msec after the printstring.

Kind regards

Jan

[Monie Jacobsen]

Hi Jan Lichtenbelt

Thank you so much for the suggestion.

Found the error, tried to upload the wrong driver.
Now works BL0032 med LCD display with 4x20