Difference between revisions of "2.2 Inch TFT Screen Display Extension Board"

Revision as of 01:48, 16 June 2016

Features

• Size: 65mm×56.5mm, standard as a Raspberry Pi HAT board
• Screen sizing 2.2 inch and supporting a 320x240 resolution with high PPI, being small but able to provide a fine image
• Multi-button design: 6 buttons, meeting different demands for buttons from various users
• With an Infrared receiver

Procedures for Applying TFT Screen Display with Raspbian Jessie

Download the simplified installation package at the bottom (or here). Transfer it to the Raspberry Pi.

Finish the installation with Installation Guide which comes along with the product.

Buttons

There are 6 buttons on the screen, which are marked by a number beginning with "#", such as #21, #22, etc. The number indicates that the pins are connected to GPIOs defined by BCM numbering.

Backlight control:

SJ2 is the switch for backlight control. Connect the two soldering pads of SJ2 by solder. You can use #27 to switch on/off the backlight.

gpio -g mode 27 in  # Switch off
gpio -g mode 27 out # Switch on

Infrared Receiving:

SJ1 is the switch for IR control.

1.Connect the two soldering pads of SJ1 by solder.

2. Update and install the LIRC. Run:

sudo apt-get update
sudo apt-get install lirc

3.Edit /boot/config.txt and add settings. IR receiver of the extension board = 26

sudo nano /boot/config.txt

Add the following line to config.txt

dtoverlay=lirc-rpi,gpio_in_pin=26

4.Edit the configuration file of LIRC to enable the Infrared function:

sudo nano /etc/lirc/hardware.conf

Change the following lines:

LIRCD_ARGS="--uinput"
DRIVER="default"
DEVICE="/dev/lirc0"
MODULES="lirc_rpi"

Note that there should be two hyphens in "--uinput".
5.Reboot the Raspberry Pi.

sudo reboot

And then, check whether the Infrared function is enabled.

ls /dev/l*

If you see the contents are displayed as shown in the above red box, it means the function is active now.

6.Record the buttons

sudo /etc/init.d/lirc stop
sudo irrecord -n -d /dev/lirc0 ~/lircd.conf

Record the buttons for your remote control as prompted. Record respectively "pause", "nextsong", "prevsong", "stop", "volumeup", and "volumedown".

Overwrite the corresponding lirc file with the recorded ~/lircd.conf

sudo cp ~/lircd.conf /etc/lirc/lircd.conf

7.Start lirc

sudo /etc/init.d/lirc start

8.Check the status of recording. Run

irw

Then press the buttons recorded before in turns.

9.You can also view the name of the recorded and ready-for-use buttons by the command irsend

irsend LIST /home/pi/lircd.conf

You can see contents similar to the following displayed

irsend: 000000000000c837 pause
irsend: 00000000000048b7 nextsong

10.Now you can send the code of the recorded buttons on the remote by the Infrared emitter. You can thus use the extension board to change programs. Refer to the following commands:

irsend SEND_ONCE /home/pi/lircd.conf pause
irsend SEND_ONCE /home/pi/lircd.conf nextsong
irsend SEND_ONCE /home/pi/lircd.conf KEY_VOLUMEDOWN
irsend SEND_ONCE /home/pi/lircd.conf KEY_VOLUMEUP