Hi, i am using Arduino Uno and i always faced problems interfacing the SD card module and TFT LCD together.
I used CardInfo example to check if the SD card is working properly, it works fine connecting to the Arduino Uno only but once i connect the LCD together the SD card couldn't work.. I wonder if it's the connection problem..
Thanks for your reply!
But is it correct for me to connect the SD included in the LCD and the SD card module to the same CS pin 4?
I am not really sure if i can connect the MOSI, SCK and MISO for both LCD and SD card module together too..
or should i change the pin numbers for the LCD's MOSI, MISO and SCK?
Can someone help me please? Thanks!
Matoo:
But is it correct for me to connect the SD included in the LCD and the SD card module to the same CS pin 4?
You had better be a bit more forthcoming about the equipment you have, but possibly not. The LCD shield data should tell you what the CS is. However, if they won't tell you, it probably is pin 4, as this is the conventional choice. This is starting to sound like you want to use both SDs. This can hardly be a good idea, and you will likely need to change the S pin of one of them, probably the SD module.
I am not really sure if i can connect the MOSI, SCK and MISO for both LCD and SD card module together too..
or should i change the pin numbers for the LCD's MOSI, MISO and SCK?
This the SPI bus. You can't change the numbers but, by virtue of it being a bus, you can put several devices on it. It is the CS pin that needs to be different and you just need to know what the LCD CS is.
How about if i'm using the SD card module only without using the SD card in the TFT LCD?
The LCD CS is pin 10, can i assign the SD card in the module to be pin 4? Thanks!
Yes, that is normal procedure, and are working as if the SD on the LCD shield isn't there. Indeed that is likely to be truly the case. I believe it is typical that the SD slots on LCD shields are "not there" by default and you have to use a jumper or solder bridge in order to use them.
You might find that it is ultimately preferable to do that, use the SD on the LCD, and dispense with the separate module.
Sorry, i meant the CS in the SD card module to be pin 4.
Yes, this is the standard CS pin for SD and standard example programmes use that. Note that some LCD shields have different CS pins for SD. It is possible that that CS would be 10 but, with a Uno, pin 10 must be high irrespective of it being used or not, so that should not be a problem.