December 12, 2014   Posted by: Dr. Ace Jeangle

How to use our new 10-inch integrated LCD

Prerequisites

For first startup you will need:

  1. 10″ integrated LCD panel
  2. miniHDMI cable (available as an option)
  3. 5V/2A power supply, jack is OD=2.6mm, ID=0.65mm, positive (+) central pin (available as an option)
  4. miniUSB cable for touchscreen (available as an option)

LCD control board is fixed on the back side of LCD and connected to LCD panel by FPC cable:
New 10" integrated LCD control board
Powering LCD

LCD with control electronics takes around 1.2A current when backlight is set to maximum value, and it can be powered either by external power supply (5V/2A, jack is OD=2.6mm, ID=0.65mm, positive central pin) or by USB. Power mode is selected by installing one of 0R resistor – R6 for normal power supply or R7 for USB power. CAUTION! Do not install both resistors at once, because this can damage USB port on your computer.

By default we supply LCD with R6 installed, therefore you will need external power supply to run LCD. For USB power you should change 0R resistor from R6 position to R7 position, and make sure that your USB port can continuously provide at least 1.2A current. Power consumption can be significantly decreased by lowering backlight level.

Firmware upgrade

We constantly add new features and provide bug fixes by releasing new firmware for our LCD panels. To update firmware you should start LCD in bootloader mode by shorting pins 5 and 7 on extension header before switching on power, then follow this firmware upload procedure: https://www.chalk-elec.com/?p=1826

New firmware for this 10″ panel is available here: http://goo.gl/wg8WY5
Follow us on Twitter to get instant notification about new firmware release:

Capacitive touchscreen

LCD touchscreen is based on capacitive technology with up to 10 fingers support, and can work in two modes depending on programmed firmware: single-touch mode and multi-touch mode. We supply LCD with default single-touch mode, because it can work without drivers with any USB host. For multi-touch mode you will need to follow firmware upgrade procedure described above and update Linux/Android kernel as per this How-to: https://www.chalk-elec.com/?p=2028

Ambient light sensor and backlight control

Starting from version 2.0 firmware for our 10″ integrated LCD supports LCD backlight control through standard USB HID protocol and automatic backlight control with optional ambient light sensor. Ambient light sensor should be connected to connector J1, red color wire to pin 1 on connector (pin 1 is marked with white dot). Additional details about backlight control from your host board or PC through USB HID commands are available here: How to control LCD backlight (USB HID).

  • Maximum brightness (MAX_BL parameter) is 18 for this 10″ LCD
  • Report ID for backlight control is 0x01

Capacitive button

To be added.

1 comment posted in: blog   |   How-To
One comment
  1. […] the touchscreen through Raspberry Pi’s USB. To change the power source, you can look up this link. You need to de-solder and solder to change the power source of this Touchscreen. So if you […]

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