raspberry pi lcd module 20x4 free sample

To use the display with CircuitPython we need to download this library from this github repository. All you have to do is to download this repository and copy the lcd folder it contains in the lib folder of your CIRCUITPY drive, just like this.

We have a code.py file with the script to run on the board and a lib folder with the lcd library. You can find links to all the files needed in the video description.

First of all we initialise the lcd object here. We have to enter the I2C address of our display here. The address for my display is this one, but yours may be different. If this one does not work, try this one also.

Now let’s go to the fun part. The LCD object offers some very useful methods. First we have the set_cur_pos method which moves the “invisible” cursor on the screen. The cursor is just a pointer which shows where we want to print something. It takes two arguments, the first one is the row, and the second one is the column. So, in this line of code I tell the script to move the cursor to the first line of the screen, which has an index of 0, and then move it to the 4th column. Next we can print something on the screen with the method print. This method just prints a string on the screen, starting from the position of the cursor.

lcd.create_char(4, the position in the display memory, it starts counting from 0 that’s why we enter 4 for the fifth item, and then the variable that holds the data we want to store, bell).

lcd.write( and we pass the location in the display memory of the character we want to display. We want to display the bell character that we saved in position 4. So, we enter 4 here. Let’s run the code! The new icon appears! How cool is that?

For example, I created another thermometer project that uses the embedded temperature sensor of the Raspberry Pi Pico board. I also created some custom characters and combined them to create a bigger font. As you can see, with tricks like this we can make impressive projects. I really like this display because it is so easy to work with and so fun.

The credit card sized Raspberry Pi computer gives all the opportunity to experiment and explore IoT. I wrote getting started with IoT using Raspberry Pi and PHP a while back. Now I thought of extending that and write about my hobby projects that I do with Raspberry Pi.

Raspberry Pi is my hobby and I thought of sharing with you about these tiny projects. This will be a multi article series. Let us start with how to connect a I2C LCD display with the Raspberry Pi.

I2C uses two bidirectional lines, called SDA (Serial Data Line) and SCL (Serial Clock Line) with 5V standard power supply requirement a ground pin. So just 4 pins to deal with.

When you buy the LCD module, you can purchase LCD, I2C adapter separately and solder it. If soldering is not your thing, then it is better to buy the LCD module that comes with the I2C adapter backpack with it.

The above image is backside of a 2004 LCD module. The black thing is the I2C adapter. You can see the four pins GND, VCC, SDA and SCL. That’s where the you will be connecting the Raspberry Pi.

Raspberry Pi GPIO pins are natively of 3.3V. So we should not pull 5v from Raspberry Pi. The I2C LCD module works on 5V power and to make these compatible, we need to shift up the 3.3V GPIO to 5V. To do that, we can use a logic level converter.

You might see RPIs connected directly to a 5V devices, but they may not be pulling power from RPI instead supplying externally. Only for data / instruction RPI might be used. So watch out, you might end up frying the LCD module or the RPI itself.

Why am I recommending the official power adapter! There is a reason to it. The cheap mobile adapters though guarantee a voltage, they do not provide a steady voltage. That may not be required in charging a cellphone device but not in the case of Raspberry Pi. That is the main reason, a USB keyboard or mouse attached does not get detected. They may not get sufficient power. Either go for an official power adapter or use the best branded one you know.

I have a headless setup. I am doing SSH from my MAC terminal and use VIM as editor. VNC viewer may occasionally help but doing the complete programming / debugging may not be comfortable. If you do not prefer SSH way, then you will need a monitor to plug-in to Raspberry Pi.

As you know my language of choice to build website is PHP. But for IoT with Raspberry Pi, let us use Python. Reason being availability of packages and that will save ton of effort. Low level interactions via serial or parallel interface is easier via Python.

Following code imports the RPLCD library. Then initializes the LCD instance. Then print the “Hello World” string followed by new line. Then another two statements. Then a sleep for 5 seconds and switch off the LCD backlight. Finally, clear the LCD screen.

The LCD has always been a device that acts as a window in human-computer interaction. For example, the prompt window on some instrument devices, the temperature and humidity prompt box, the device running status monitor, and the prompt screen of the counting device all have LCD figures.

The 3.5 inch LCD Display is directly pluggable into a Raspberry Pi and perfectly fits various Pi models from B+ to Raspberry Pi 3B+. It is a brilliant alternative for an HDMI monitor. When set up, it behaves as a human-machine interface enabling the user to prototype with the Raspberry Pi device anywhere at any time.

To control an LCD with a microcontroller as the Raspberry Pi Pico can be a quite complicated job. Well, if your display is equipped with an IC2 module and specific MicroPython libraries are available, it’s not that difficult to connect to the display to the Raspberry Pi Pico. Learn with this tutorial how to connect and to program an 1602 LCD with a Raspberry Pi Pico.

There are many types of LCD displays. In this tutorial we are using the popular and affordable 1602 LCD. The LCD has an IC2 module soldered on it (see the pictures below). If your LCD is of the same type, but has a different size, it won’t be a problem to continue with this tutorial. You’ll just have to correct some parameters in the MicroPython script. But if it is from a different type or it has no I2C module, you better look for another tutorial.Prepare the hardware

– First you need a computer to run Thonny. In this tutorial we’ll use a Raspberry Pi 4 as our computer. And Thonny is a user-friendly Python IDE to interact with the Raspberry Pi Pico board. If you never used Thonny to program the Raspberry Pi Pico, before continuing, you better have a look at our tutorial “How to start programming the Raspberry Pi Pico“.

– You also need a Raspberry Pi Pico of course.  And as we’ll connect another device to the Pico, we need pin headers soldered to the GPIO-pins of our board.

In this tutorial we are using the popular and quite basic 16×2 or 1602 LCD. It can display 16 characters per line on 2 lines. Each character is made from a matrix with 5×7 dots. It is equipped with a backlight for easy reading. Besides sending text, thanks to specific commands, we can give instructions to the display, as to switch on/off the backlight for example.

The display we use in this tutorial is equipped with a I2C-module (black part on the picture below). I2C is a communication protocol which allows an easier connection between the display and the Raspberry Pi Pico. Indeed, instead of having to wire all the pins on the top of the screen, we only have to connect the display with 4 wires to our Raspberry Pi Pico.

Each I2C device has its own I2C address. Often this address is hard-wired in the device and will vary from manufacturer to manufacturer. Have a look at our tutorial ‘Find out an I2C address with the Raspberry Pi Pico‘ to get the very basics of I2C.

If you bought one of our kits, the hexadecimal address of the LCD is ‘0x27’. And if you don’t know the address, you can find it out with the help of our tutorial ‘Find out an I2C address with the Raspberry Pi Pico‘. We will need the I2C address from the display to insert it in our MicroPython code.

To avoid extensive and complicated code writing, libraries are often used. For our LCD, we will also be using a library. We found the most appropriate library at GitHub from Tyler Peppy. And he based his work on the Python library created by Dave Hylands. As these files from this quite specific library don’t come automatically with MicroPython, we have to install them ourselves.

So, before writing the code, we’ll have to upload the files to our Raspberry Pi Pico. You can download a ZIP-folder containing the 2 files to be installed here.

Once downloaded and unzipped on our computer, we upload these files to our Raspberry Pi Pico. If you don’t know how to do that, have a look at our tutorial ‘Transfer files between computer and Raspberry Pi Pico‘. If you have multiple folders on your Raspberry Pi Pico, make sure you upload them in the same folder as the new file we will create for our main code. And don’t change the filenames of the library of course.

And before running the script, it’s important to adjust the contrast of your LCD. If the contrast isn’t adjusted well, it’s possible you don’t see appearing anything. You can adjust it by turning with a small screwdriver at the blue potentiometer at the back of your LCD (see the pictures here above). Make sure the backlight of the display is on to see the result. If the LCD’s contrast is adjusted right, you can just see the darker rectangles for the characters appear.

Besides the commands we used in the last lines of our script, there are more possibilities to communicate with the LCD. If you want to learn more about, have a look at this Github webpage.

ERM2004SYG-3 is small size 20 characters wide,4 rows character lcd module,SPLC780C controller (Industry-standard HD44780 compatible controller),6800 4/8-bit parallel interface,single led backlight with yellow green color included can be dimmed easily with a resistor or PWM,stn-lcd positive,dark blue text on the yellow green color,wide operating temperature range,rohs compliant,built in character set supports English/Japanese text, see the SPLC780C datasheet for the full character set, It"s optional for pin header connection,5V or 3.3V power supply and I2C adapter board for arduino.

It"s easily controlled by MCU such as 8051,PIC,AVR,ARDUINO,ARM and Raspberry Pi.It can be used in any embedded systems,industrial device,security,medical and hand-held equipment.

OpenLCD.write(128 + 20 + 9) is C code. In C the expression in the parenthesis is evaluated first. When the compiler sees that, it adds 128 to 20 to 9 which is 157. Then it sends 157 Dec to serial port. It sends just one byte, not three bytes one after the other.

The LCD has always been a device that acts as a window in human-computer interaction. For example, the prompt window on some instrument devices, the temperature and humidity prompt box, the device running status monitor, and the prompt screen of the counting device all have LCD figures.

All orders are processedwithin 24 hoursafter they are placed. Usually, we are able to ship orders the next day. Weekend orders are shipped on the following Monday. You will receive a shipping confirmation email from our system when the shipping information has been uploaded.

Generally, we will ship the orders with Free Shipping, without the minimum order amount requirement. You may check if the free shipping method is available to your country in the Delivery Area below.

As soon as your order is packed and shipped, you"ll receive a shipping confirmation email. You will then be able to track your order through the tracking link on the email. If you haven"t received an email yet, please reach out to us atservice@sunfounder.com, our sales staff will contact you ASAP.

* Delivery Time - These are the delivery estimates provided by our shipping partners and apply from point of dispatch, not from point of sale. Once your parcel leaves our warehouse, we cannot control any delays after that point.