PLEASE NOTE: This article is obsolete or related to a discontinued product.

16x2 alphanumeric LCD and four push-button on Arietta G25

Daisy-24 is a mini I2C terminal which mounts a Winstar alphanumeric 16x2 chars LCD module and 4 push buttons. This article illustrates how to use it with Arietta G25

This is the wires between Arietta G25 and the Daisy-24 module:

Signal	Description	Arietta Pin #	Daisy 24 pin
3V3	Power out 3.3 volt DC	J4.5	3V3
SDA0	Data line bus 0	J4.14	SDA
SCL0	Clock line bus 0	J4.12	SCL
GND	Ground	J4.9	GND

Code examples

Python
C

Install ablib.py to try these examples.

Hello World !

hello.py

Cursor control

cursor.py

Text contrast control

contrast.py

Push-button and backlight

readkey.py

Hello World !

hello.c

Backlight control

backlight.c

Push-buttons

key.c

What to do if not works

Check if exists a device called i2c-0 by typing:

root@arietta:~# ls -al /dev/i2c-0
crw-rw---T 1 root i2c 89, 0 Jan  1 01:48 /dev/i2c-0
if it not exist go on the Device Tree Compiler page and create a new device tree file with i2c-0 enabled follow the instructions to copy the new device tree file on yoru microSD and reboot.