Serial LCD interface with Arduino Mega

Forum 2005-2010 (read only) Hardware Interfacing
1

Hi,

I got a robotbase 12864 LCD based on ST7920 controller.

I want to connect it with Mega 1280 And to test some example.

Please suggest wiring with Mega 1280 for serial LCD.

Also example code.

Regards,
BT

2

Please suggest wiring with Mega 1280 for serial LCD.

There are three wires. One is for +5V. One is for ground. The other connects to a hardware or software serial pin. Since the Mega has 4 hardware serial ports, use one of them.

Also example code.

SerialN.print("That was easy"); // Where N corresponds to the serial port being used.
3

thanks for the reply.

The info I got from the vendor.

When operating in serial mode pin definition:
PIN1 ------ GND power - generally take 0V.
PIN2 ------ Power +, general access 5V.
PIN3 ------ contrast adjustment side.
PIN4 ------ RS (CS), chip select
PIN5 ------ R / W (SID), the data
PIN6 ------ E (SCK), pulse
PIN7 ------ NC, not connected
PIN8 ------ NC, not connected
PIN9 ------ NC, not connected
PIN10 ----- NC, not connected
PIN11 ----- NC, not connected
PIN12 ----- NC, not connected
PIN13 ----- NC, not connected
PIN14 ----- NC, not connected
PIN15 ----- PSB parallel: PSB = 1, can take VCC; Serial: PSB = 0, general access GND
PIN16 ---- NC, not connected
PIN17 ----- ~ RST, reset the module, do not connect
PIN18 ---- NC, not connected
PIN19 ---- LED, backlight +, general access 5V.
PIN20 ---- LED-, back light -, general access GND.

PIN 4,5,6 are important.

So where these PIN 4,5,6 can be connected in mega?

I feel its not just serial comm, some command and initialization is needed.

Regards,
Sudipta

4

Why don't you post a link to the device that you have?

Serial LCDs have 3 lines. The lines that the vendor is suggesting that you connect suggest that the device uses SPI, not serial, communications. A link would be useful to see for certain.

5

the product.

http://item.taobao.com/item.htm?id=5678755079

Thanks,
BT

6

Hi,

The LCD supposed to be connected in the serial interface.

See the image bellow.

648×635 117 KB

Now if I have to connect to the mega 1280, which pins I can use?

Any code available?

Regards,
BT

7

You can either use SPI which are pins 50-53 or use shiftOut which can use any pins. Download the ST7920 datasheet from Sitronix to get the programming instructions to initialize it.