Running Multiple LCD Displays On One Arduino UNO

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.

 

Code and Connection To Run Multiple LCD Displays On One Arduino UNO

 

Using I²C LCD module it is quite easy. I²C LCD module has only two unique pins per module – SDA and SCL. Code will be like this :

You will clearly see two different prints on two different displays.

Without I²C module same thing is also possible. First look at “Hello World” example :

From that :

…means :

Let us rearrange the connection pins :

We can have 2 or 3 or 4 LCD sharing some pins with one unique :

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 :

Working proof that it works :

Code will go like this :

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