electronic screen: 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：