Hi Hans,
The only "piggyback" that I know of for alphanumeric LCD's contain an
I2C-to-8bit converter, most of the time, an PCF8574
If this is not the part that is on yours, please mention it.
For the rest, the trick is "only" to send on I²C the commands that are
documented in the HD44780 datasheet.
Therefore, I think you should give a try to the lcd_hd44780_PCF8574.jal
library.
If the chip on your adapter is another chip, check also what is the I2C
adress to be used (the library used adress 0x27, hardcoded)
Hope this helps
David
Le 04-02-25 à 19:23, Hans van Veldhuizen a écrit :
Hello Rob,
It is not about the HD44780 on the well-known 6-pin connection. It is
about an interface that you can stick on such an LCD and then control
the thing with I2C, (so only two connections instead of 6). The
PCF8574 is a different thing. The link that Pinhead indicated (to AZ
is about such an interface.)
https://www.az-delivery.de/products/lcd-display-16x2-blau-und-i2c-set-kostenfreies-e-book
greetings
Hans
Op dinsdag 4 februari 2025 om 19:01:11 UTC+1 schreef Rob CJ:
Hi Hans,
I do not know what you mean. I see in Jallib several libraries for
the HD44780, some for use with the display directly and one using
a PCF8574. If the type number is the same, the library should work
(I assume).
If you have enough pins available on your PIC, you could use the
one that interfaces directly with the display by a 4-bit bus or
8-bit bus.
Kind regards,
Rob
------------------------------------------------------------------------
*Van:* [email protected] <[email protected]> namens
Hans van Veldhuizen <[email protected]>
*Verzonden:* maandag 3 februari 2025 21:49
*Aan:* jallib <[email protected]>
*Onderwerp:* Re: [jallib] I2C LCD lib
Hllo Rob,
Do you mean ; lcd_hd44780_pcf8574. jal . The pcf8574 look different..
regards
Hans
Op maandag 3 februari 2025 om 19:48:28 UTC+1 schreef Rob CJ:
Hi Hans,
There is a JAL library for the HD44780. Not sure if you are
looking for that.
Kind regards,
Rob
------------------------------------------------------------------------
*Van:* [email protected] <[email protected]>
namens Hans van Veldhuizen <[email protected]>
*Verzonden:* maandag 3 februari 2025 19:27
*Aan:* jallib <[email protected]>
*Onderwerp:* Re: [jallib] I2C LCD lib
Hi Pinhead, it is not from AZ but it looks identical. Great
again somthing to try.
Thanks
Hans
Op maandag 3 februari 2025 om 19:02:14 UTC+1 schreef
[email protected]:
https://www.az-delivery.de/products/lcd-display-16x2-blau-und-i2c-set-kostenfreies-e-book
Télécharger BlueMail pour Android <https://bluemail.me>
Le 3 févr. 2025, à 18:53, Rob CJ <[email protected]> a écrit:
Hi Hans,
I am missing information here. Which I2C adapters do
you mean?
Kind regards,
Rob
------------------------------------------------------------------------
*Van:* [email protected]
<[email protected]> namens Hans van Veldhuizen
<[email protected]>
*Verzonden:* maandag 3 februari 2025 17:35
*Aan:* jallib <[email protected]>
*Onderwerp:* [jallib] I2C LCD lib
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Hi all,
A while ago I bought a few 16x2 LCDs and they came
with I2C adapters that I haven't used yet. Is there
already a sample program for this kind of thing?
Greetings
Hans
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