LCD-2000_Function manual

1.Introduce

  This manual mainly introduced the function examples from the LCD-2000 driver library. Every driving function is included in the driver file. We have a total of three electronic screen, they are LCD-2000-3916/LCD-2000-9225/LCD-2000-7775. The
driver of them is not exactly the same, but the driving way is the same. We can call function in the same way. So this manual is suitable for three kinds of LCD screen.

We can description the functional use the format as fellow:

Table 1.Function Description format

Table 2.Function drawLine

Example：/*draw a black line between（0，0）and（100,100）*/
drawline（0,0,100,100，RGB（0,0,0））;

Table 3.Function drawFastVLine

Example：/*draw a black line which length is 50 and start with（0,100）*/
drawFastVLine（0,100,50，RGB（0,0,0））；

Table 4.Function drawFastHLine

Example：/* draw a black line which length is 80 and start with（20,0）*/
drawFastHLine（20,0,80，RGB（0,0,0））;

Table 5.Function fillRect

Example：/*fill a black rectangle start with (0,0)，its length is 100，the width is 50 */

fillRect(0,0,100,50,RGB(0,0,0))；

Table 6.Function fillScreen

Example：/*fill the screen with red*/

fillScreen(RGB(255,0,0));

Table 7.Function drawCircle

Example  ：/*draw a red circle*/

drawCircle(50,100,50,RGB(255,0,0));

Table 8.Function drawCircleHelper

Table 9.cornername value

Example：/*draw the top of the circle*/

drawCircleHelper(50,100,50,1+8, RGB(255,0,0);

Table 10.Function fillCircle

Example：/*fill a red circle*/

fillCircle(50,100,50, RGB(255,0,0));

Table 11.Function fillCircleHelper

Example：/*fill a circle*/

fillCircleHelper(50,100,50,1, 20,RGB(255,0,0));

Table 12.Function drawTriangle

Example: /*draw a rad triangle*/
drawTriangle(0,0,0,100,50,0, RGB(255,0,0));

Table 13.Function fillTriangle

Example: /*fill a triangle use red*/
fillTriangle(0,0,0,100,50,0, RGB(255,0,0));

Table 14.Function drawRoundRect

Example: /*draw a red roundrect */
drawRoundRect(20,20,100,80, 20,RGB(255,0,0));

Table 15.Function fillRoundRect

Example: /*fill a drawRoundRect with red*/
fillRoundRect(20,20,100,80,20, RGB(255,0,0));

Table 16.Function drawChar

Example: /* a black characters write on a write paper*/
drawChar(10,10,'A', RGB(255,255,255), RGB(0,0,0),5) ;

Table 17.Function setstroke

Table 18.Function setTextColor

Table 19.Function setTextSize

Example: /*set a stroke, and a text color, a text size*/
TFTscreen.stroke(255,255,255);
TFTscreen.setTextColor(0xffff, 0xf000);
TFTscreen.setTextSize(2);

Table 20.Function text

Example: /* output a string*/
Text ("abcd: \n ",0,0);

Multi channel Voltage

1. The purpose of the experiment

This application note is in order to introduce the 8-channel voltage acquisition system . The system included one Arduino UNO R3 board, one DS-REF-431,one TFT LCD screen(We have the LCD-2000-7775 and the LCD-2000-9225, you can choose one to use). The main content of this article is to present the voltage data display .The measured voltage range is 0~4.096V

2. Experiment platform

l  Hardware platform

  One computer, one Arduino UNO R3 board, a LCD-2000-7775 screen, USB data cable, DS-REF-431

l  Software platform

   Arduino-1.5.4, Aruduino drive for Windows

3.Experiment process

(1) We can use DuPont cable to connect the 9K resistance between VCC and A0 port, a 910Ω resistance between  GND  pin and A0 pin. The others(A1-A7) is connection as the same as A0.

(2)Then we can connect the reference source module to UNO R3 board, the connection of pin shows the following table.

Because of the development board internal reference source is not accurate enough, so in order to get a accurate value we need an external reference source. In this experiment ,we used the reference source module is designed  an production by ourselves, which will provide a stable precision reference voltage. In this test , it will provide an accuratevoltage of 4.096V. If you want to know more about the DS-REF-431, you can scan our website to download the datasheet. 

Connection circuit diagram as below:

(3) Open the arduino-1.5.4 software, and writing a program

²  LCD-2000-7775(LCD-2000-9225) is a thin transistor liquid crystal display，each pixel can be drove by the thin film transistor which is behind the TFT. By this way, it is not only improves the response speed of the display, and you can precisely control display levels. Then the color of TFT LCD will be more realistic. For the TFT LCD module, we can display numbers, English characters, pictures color and the like.

The initialization of LCD screen is shown below：

      ²  The Voltage acquisition software is shown below:

²  The Voltage acquisition data display on LCD-2000-7775 software is shown below.

 4. Result

l  We can see the voltage data from the LCD-2000-7775
l  We can easily achieve 8 channels voltage acquisition by change the program