Go Down

Topic: Has anyone got these cheap LCD's to work with arduino? (ST7735R) (Read 10007 times) previous topic - next topic

dtokez

That's a good idea, so I guess you would print the old text again to overwrite it (inverted color), then set the cursor position back and print the new?


dtokez

thanks I will try that later :)

One other thing, I guess this won't work in SPI mode if I want to use a Ethernet shield aswel?

zachwiej

Mmm hard to say I know that w5100 have problems with other devices on spi bus

tack

It should work with other SPI Devices, as the SD card example shows.

As long as each device is assigned to it's own CS pin and the correct confit declared in the constructor or library.

As said above though, there can be issues with Wiznet 5100 based board as there is a bug with it where it doesn't release the SPI bus after use. Some shields have a fix implemented to ensure the CS is switched correctly.

I had an Ethernet shield clone that seemed to work OK alongside an nRF24L01+ transceiver on the same SPI bus, so your mileage an vary.

zachwiej

I just received this LCD on PCB and I think that there is no voltage level conversion ! only 10k ohm resistor on SD card lines!
So I don't think that it's safe to connect this lcd to arduino directly !

dtokez

Oh really? Do all the LCD signals need to be 3.3v then? Mine has been running fine but only for a few hours I guess?

zachwiej

There is no information in datasheet that input are 5v tolerant (adafruit lcd board contains voltage level converter) so better asume that they need to be 3.3v logic level

dtokez

oooh interesting. Did you use something on the bare LCD that you bought with no PCB?

zachwiej

That project runs on 3.3v see schematics and pcb in attachment :)
Another one

dtokez

Attachments don't seem to be working on here at the moment :( I noticed earlier but yours seems to be the same.

zachwiej


dtokez

Not working either, I'm getting a No data received page?

Go Up