multiple lcd displays arduino free sample

Commonly we show example of getting started with LCD with one LCD and some sensor, like we have guide on Arduino Temperature & Humidity Sensor DHT 11 With LCD 1602A. We Can Easily Run Two to Four 16×2 LCDs On Arduino UNO. In This Article, We Will Supply Same Code and Diagram For Running Multiple LCD Displays On One Arduino UNO. Basic matter is that, when we use LCD without I²C module then it occupies lot of pins. For making easy around basic theory, we discussed about Serial Peripheral Interface, I²C etc topics and shown example setup of 1602A LCD Display I2C Serial Interface. The solution to run multiple LCDs at the same time probably obvious by now – using I²C module. But without I²C module it is also possible to use multiple LCD displays, that is by sharing some of the pins.

Pin 7, 8, 9 and 10 on the Arduino for the data. Pin 12 for RS. Pin 2, 3, 4 and 5 for the signal for display. You can use one common potentiometer. Idea of using four displays is from this website :

multiple lcd displays arduino free sample

The circuit diagram for interfacing of three LCDs with Arduino is shown in Fig. 1. It is built around popular Arduino Uno board (BOARD1), three 16×2 LCDs (LCD1 through LCD3), three 10-kilo-ohm presets (VR1 through VR3) and a few other components. The Arduino board is the brain of the circuit, which displays data on the three LCDs simultaneously or individually depending on the requirement.

As shown in Fig. 1, the 5V and ground required to operate the circuit are provided by the Arduino Uno board. All the three LCDs are configured in 4-bit mode. Common data lines of all the LCDs (D4 through D7) are connected to digital pins 4 through 7 of Arduino Uno. RS and EN control pins of LCDs are connected to different digital pins of Board1. Pin-to-pin connections between LCDs and the Arduino Uno board are shown in Table I.

If you want to display data on the first LCD (LCD1) only, connect RS and EN pins of LCD1 to Arduino using SJ1 and SJ2 across connector CON1. Remove SJ3 through SJ6 so that RS and EN pins of the other two LCDs are not used. Thus it is possible to send data to the selected LCD while using common data lines of the LCDs.

To display data on the second LCD (LCD2) only, connect RS and EN pins of LCD2 using SJ3 and SJ4. Remove SJ1, SJ2, SJ5 and SJ6 to ensure that RS and EN pins of the other two LCDs are not used.

Similarly, to display data on the third LCD (LCD3) only, connect RS and EN pins of LCD3 using SJ5 and SJ6, ensuring that all other RS and EN pins are not used.

When you want to display data on all the three LCDs, connect all the shorting jumpers (SJ1 through SJ6) to the Arduino Uno board. Refer Table II for jumper settings and data displays on different LCDs.

The software (multi.ino) for interfacing of the multiple LCDs using Arduino is written in Arduino programming language. The Arduino Uno is programmed using Arduino IDE software.

An actual-size PCB layout for interfacing multiple LCDs with Arduino is shown in Fig. 2 and its components layout in Fig. 3. After assembling the circuit on the PCB, connect Arduino Uno and the PCB using external male-to-male jumpers. Then solder the 16-pin bergstrip male connector on the LCD and 16-pin bergstrip female connector on the PCB. Fix all the LCDs on the PCB in the space provided.

After assembling the circuit, connect the Arduino board to your computer with standard USB cable. Compile the source code (multi.ino) and upload it to the Arduino Uno board. Connect shorting jumpers SJ1 through SJ6 on the respective connector as explained above.

You can see data display on LCD1 or all the LCDs as per the jumper settings (refer Table II). Vary contrast-control preset VR1 left and right until you get clearly visible text on LCD1.

multiple lcd displays arduino free sample

This article gives you a step-by-step guide to becoming a pro in using Liquid Crystal Display. We will use a free Arduino Simulator to try all the examples without leaving your PC. No hardware is needed.

You can see that the first eight characters are user-defined. It allows you to create custom shapes and store them. You will see how to create custom characters and load them in your following Arduino projects. Let us start with a basic example.

We will print a simple text on the LCD using Arduino UNO in this example. In this case, you control what is displayed on the Arduino readily. You only need four cables. Power, Ground, I2C data, and I2C clock.

The below line code adds the LCD library to your project. This consists of all the LCD-related functions. Since we are using the I2C version, we have included the standard LCD library made for the I2C version.#include

The following line of the code resets and initializes all the LCD registers and prepares them for project usage. This function will be called only once in thesetup()function.lcd.init();

To turn on the backlight, you can use the below code. You will be able to see the contents of the display without a backlight, too, if it is a green LCD. Backlight, nevertheless, makes the project more beautiful and reading crisper.lcd.backlight();

The first parameter tells the position column-wise (0indicated first place,1indicates the second place, and so on). The second parameter tells the row number. We have only two rows (0and1).lcd.setCursor(1, 0);

This completes a basic introduction to the LCD as well as an example project to start the LCD exploration. In the coming sections, we will see different projects as soon as possible