raspberry pi 1602 serial blue backlight lcd module quotation

2023-01-03 12:32:11

ERMC1602SBS-2 is 16 characters wide,2 rows character lcd module,SPLC780C controller (Industry-standard HD44780 compatible controller),6800 4/8-bit parallel interface,single led backlight with white color included can be dimmed easily with a resistor or PWM,stn- blue lcd negative,white text on the blue 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.

raspberry pi 1602 serial blue backlight lcd module quotation

The principle of the LCD1602 liquid crystal display is to use the physical characteristics of the liquid crystal to control the display area by voltage, that is, the graphic can be displayed.

I2C uses only two bidirectional open-drain lines, Serial Data Line (SDA) and Serial Clock Line (SCL),pulled up with resistors. Typical voltages used are +5 V or +3.3 V although systems with other voltages are permitted. It can be operated as long as it supports the I2C development board.

Features: Easy to use; Less I/O ports are occupied; Support IIC Protocol; The I2C LCD1602 library is easy to get; With a potentiometer used to adjust backlight and contrast; Blue backlight; Power supply: 5v; I2C address is: 0x27.

raspberry pi 1602 serial blue backlight lcd module quotation

Everyone love the 1602 character LCD, is cheap and works out of box! But the need for 6 to 10 GPIOs is the pain :) It takes most of GPIO of Arduino and other microcontroller. Now with this I2C or Two wires interface LCD, you will save a lot of GPIO for your sensor and motor control.

LCD shield after connected with a certain quantity of sensors or SD card. However, with this I2C interface LCD module, you will be able to realize data display via only 2 wires. If you already has I2C devices in your project, you can still program this LCD with the correct I2C address. It is fantastic for Arduino based project.

raspberry pi 1602 serial blue backlight lcd module quotation

Connecting an LCD to your Raspberry Pi will spice up almost any project, but what if your pins are tied up with connections to other modules? No problem, just connect your LCD with I2C, it only uses two pins (well, four if you count the ground and power).

In this tutorial, I’ll show you everything you need to set up an LCD using I2C, but if you want to learn more about I2C and the details of how it works, check out our article Basics of the I2C Communication Protocol.

There are a couple ways to use I2C to connect an LCD to the Raspberry Pi. The simplest is to get an LCD with an I2C backpack. But the hardcore DIY way is to use a standard HD44780 LCD and connect it to the Pi via a chip called the PCF8574.

The PCF8574 converts the I2C signal sent from the Pi into a parallel signal that can be used by the LCD. Most I2C LCDs use the PCF8574 anyway. I’ll explain how to connect it both ways in a minute.

I’ll also show you how to program the LCD using Python, and provide examples for how to print and position the text, clear the screen, scroll text, print data from a sensor, print the date and time, and print the IP address of your Pi.

Connecting an LCD with an I2C backpack is pretty self-explanatory. Connect the SDA pin on the Pi to the SDA pin on the LCD, and the SCL pin on the Pi to the SCL pin on the LCD. The ground and Vcc pins will also need to be connected. Most LCDs can operate with 3.3V, but they’re meant to be run on 5V, so connect it to the 5V pin of the Pi if possible.

If you have an LCD without I2C and have a PCF8574 chip lying around, you can use it to connect your LCD with a little extra wiring. The PCF8574 is an 8 bit I/O expander which converts a parallel signal into I2C and vice-versa. The Raspberry Pi sends data to the PCF8574 via I2C. The PCF8574 then converts the I2C signal into a 4 bit parallel signal, which is relayed to the LCD.

Before we get into the programming, we need to make sure the I2C module is enabled on the Pi and install a couple tools that will make it easier to use I2C.

Now we need to install a program called I2C-tools, which will tell us the I2C address of the LCD when it’s connected to the Pi. So at the command prompt, enter sudo apt-get install i2c-tools.

Next we need to install SMBUS, which gives the Python library we’re going to use access to the I2C bus on the Pi. At the command prompt, enter sudo apt-get install python-smbus.

Now reboot the Pi and log in again. With your LCD connected, enter i2cdetect -y 1 at the command prompt. This will show you a table of addresses for each I2C device connected to your Pi:

We’ll be using Python to program the LCD, so if this is your first time writing/running a Python program, you may want to check out How to Write and Run a Python Program on the Raspberry Pi before proceeding.

There are a couple things you may need to change in the code above, depending on your set up. On line 19 there is a function that defines the port for the I2C bus (I2CBUS = 0). Older Raspberry Pi’s used port 0, but newer models use port 1. So depending on which RPi model you have, you might need to change this from 0 to 1.

The function mylcd.lcd_display_string() prints text to the screen and also lets you chose where to position it. The function is used as mylcd.lcd_display_string("TEXT TO PRINT", ROW, COLUMN). For example, the following code prints “Hello World!” to row 2, column 3:

On a 16×2 LCD, the rows are numbered 1 – 2, while the columns are numbered 0 – 15. So to print “Hello World!” at the first column of the top row, you would use mylcd.lcd_display_string("Hello World!", 1, 0).

You can create any pattern you want and print it to the display as a custom character. Each character is an array of 5 x 8 pixels. Up to 8 custom characters can be defined and stored in the LCD’s memory. This custom character generator will help you create the bit array needed to define the characters in the LCD memory.

The code below will display data from a DHT11 temperature and humidity sensor. Follow this tutorial for instructions on how to set up the DHT11 on the Raspberry Pi. The DHT11 signal pin is connected to BCM pin 4 (physical pin 7 of the RPi).

By inserting the variable from your sensor into the mylcd.lcd_display_string() function (line 22 in the code above) you can print the sensor data just like any other text string.

These programs are just basic examples of ways you can control text on your LCD. Try changing things around and combining the code to get some interesting effects. For example, you can make some fun animations by scrolling with custom characters. Don’t have enough screen space to output all of your sensor data? Just print and clear each reading for a couple seconds in a loop.

raspberry pi 1602 serial blue backlight lcd module quotation

This repository contains all the code for interfacing with a 16x2 character I2C liquid-crystal display (LCD). This accompanies my Youtube tutorial: Raspberry Pi - Mini LCD Display Tutorial.

During the installation, pay attention to any messages about python and python3 usage, as they inform which version you should use to interface with the LCD driver. For example:

It is possible to define in CG RAM memory up to 8 custom characters. These characters can be prompted on LCD the same way as any characters from the characters table. Codes for the custom characters are unique and as follows:

This demo uses ping and nc (netcat) to monitor the network status of hosts and services, respectively. Hosts and services can be modified by editing their respective dictionaries:

exchangerate-api.com / free.currencyconverterapi.com: There are a lot of currency apis but these ones offer free currency exchange info. Both are used, one as main, the other as backup. Requires an API key to use.

In order to use the script, you need to get API key tokens for both exchange rate services and the weather api. Once you"ve done that, edit the script to put your tokens in the USER VARIABLES section.

raspberry pi 1602 serial blue backlight lcd module quotation

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raspberry pi 1602 serial blue backlight lcd module quotation

1602 LCD Board Keypad Shield Blue Backlight for Arduino is a very popular LCD Keypad shield for Arduino and other variants. It includes a 2x16 LCD display and 6 momentary push buttons. Pins 4, 5, 6, 7, 8, 9 and 10 are used to interface with the LCD. Just one Analog Pin 0 is used to read the five pushbuttons. The LCD shield supports contrast adjustment and back-lit on/off functions. It also exposes five analog pins for easy analog sensor plugging and display. An on board power LED is also provided.

This design is great since easily lets you keep connecting sensors to the rest of the pins, and use it for monitoring or menu selection with the push buttons even for gaming. Often project applications require testing or debugging. Displaying information right away help on most occasions when a computer is not at reach. If you are planning to build something not attached to a computer and you need to check what is going on when you place it on position, this addition will prove very valuable to make sure the program is running well.

The used LCD pins are not exposed on top side of the board leaving only the unused ones. This way, conflict with LCD pins on top of the board will not happen anymore.

The buttons are connected to only one analog input pin through resistors to give a different voltage for each button, thus saving on input/output pins. Reading the buttons is easy and example code is shown below

Features :The LCD Keypad shield is developed for Arduino compatible boards, to provide a user-friendly interface that allows users to go through the menu, make selections etc.

raspberry pi 1602 serial blue backlight lcd module quotation

This is a 1602 serial alphanumeric LCD with white characters on a blue backlight display. With AIP31068L driver IC, it only needs a 3.3V power supply to work.

raspberry pi 1602 serial blue backlight lcd module quotation

If you want to add some visual output to your Arduino projects, you’ll need a display. If you need only a little to display, the LCD1602 Parallel LCD Displayis a quite good solution.

This is LCD1602 Parallel LCD Display that provides a simple and cost-effective solution for adding a 16×2 White on RGB Liquid Crystal Display into your project. The display is 16 character by 2 line display that has a very clear and high contrast white text upon a blue background/backlight.

This is the great blue backlight LCD display. It is fantastic for Arduino-based projects. This LCD1602 Parallel LCD Display with Yellow Backlight is very easy to interface with Arduino or Other Microcontrollers.

One thing to consider is you’ll waste about 8 Pins on your Arduino for the display to get working. Luckily there exists an I2C adapter that you can solder right onto the pins of the display. So all you need to connect are the I2C pins, which show a good library and little of coding.

raspberry pi 1602 serial blue backlight lcd module quotation

I"m having issues with this (http://www.midasdisplays.com/pdf/MCOB21605G1V.pdf) screen. I"ve used LCD version of this screen before with an arduino, the oled version is nice as it requires less wires and less current and no faffing about with contrast.

This is supposed to be a drop in replacement for 44780 but I cannot get the thing to work reliably, im having issues with stuff getting to the screen out of order, garbled and even some times I start the code and lines 1 and 2 are the wrong way around. Sometimes there"s complete garbage on the screen and the only way to resolve that is to reboot everything (as removing the 5v supply going to the screen locks up the pi... not always but more often than not).

Experiencing very similar issues http://www.raspberrypi.org/phpBB3/viewt ... 88#p496788 However, I have more wiring as I have not disconnected backlight (15/16).

I just explain to someone how to use the SPI with a 74HC595 instead. I just bought a LCD2002A to verify if it is possible and it is. I played with the display all evening and no problem at all.

I have just been playing with a Winstar 16x2 OLED, and ran into the same problems (incorrect line order, complete garbage, etc), but only after running the Python script a few times. I was using a very similar Python script (pulled from the web) to what you have described, and it worked OK with all the HD44780 LCDs that I had. However, when I looked at the initialisation code, it was not actually following the HD448780 specification exactly, and therefore, it appears that the OLED driver (WS0010) is rather more fussy. I have attached my updated example driver, which appears to be bomb-proof with both OLEDs and LCDs.

3) There is an extra initialisation step for the character/graphic mode and power control, set by writing 0x17 to the display; it has no effect on HD44780 LCDs. Though not usually required (because the OLED display powers on in the correct mode), it is necessary if the display has previously become misconfigured in this area (for example it it received a garbled command).

not tieing the R/W line low is one usual gotcha, but it"s usually safer to ground the unused databits as well. Some LCD"s may pull these low, but not all of them in my experience.

I"ve been struggling with much the same issue... Got a nice big 16x2 OLED that mostly works with the Adafruit_CharLCD code... to a point... I"ve added a "createChar" function to the Adafruit_CharLCD.py file, and it works fine for the LCD displays, writing out "sideways" characters to the CGRAM area, where I can display them nicely using the "\x" escape sequence... However, when I call the createChar function with the OLED, it just seems to go off into la-la land..... I"ll append the "createChar" function here, in case it may be something somebody else sees as obvious.... I"m stumped!

not tieing the R/W line low is one usual gotcha, but it"s usually safer to ground the unused databits as well. Some LCD"s may pull these low, but not all of them in my experience.

Hmmm... interesting. I"m playing around with various LCD 1602 interfaces at the moment: No problems with an "intelligent", PIC-based I2C (or serial, not yet tried) interface, nor with my own**, parallel, hard-wired "write-only" (R/W low), 8-bit interface (E & RS on GPIO pins, 8-bit data via an I2C PCF8574AP). However, I"m now trying out a Funduino LCM1602 I2C backpack**** with intriguing results so far. This is just a PCF8574T plus a "contrast pot" and a transistor buffer on the backlight. P7-P4 connect to D7-D4, P3 drives the backlight transistor, P2 --> E, P1 --> R/W and P0 --> RS. My ("C" based) program keeps R/W "low" AFAICT (but I don"t have access to an oscilloscope to check for "spikes") and I can initialise the LCD into 4-bit mode and write commands and data to it almost as well as with my 8-bit interface (I"m cloning/adapting my 8-bit tests). Almost, but not quite there (yet) - for some reason the last written command or data appears to be ignored until I (re-run the program and) write a new sequence. I"m beginning to wonder if the interface is "meant" to be used (in the "arduino world") in both read and write modes ie. by actually reading and checking the "Busy Flag"!

Edit: Update - I think I"ve solved my problem. It"s unclear from the HD44780U data sheet I"m using whether the "idle state" of the E pin is "high" or "low". Re-checking the code used in wiringPi suggest that it"s "low" and the strobe signal goes "high" then "low". In my "8-bit" code I was doing the opposite ie. idle "high", strobe "low" and then back "high" (which worked, maybe because the data is fully stable before the strobe happens ???) For the 4-bit interface the wiringPi method seems to be needed.

Still running Raspbian Jessie or Stretch on some older Pi"s (an A, B1, 2xB2, B+, P2B, 3xP0, P0W, 2xP3A+, P3B, B+, and a A+) but Buster on the P3B+, P4B"s & P400. See: https://www.cpmspectrepi.uk/raspberry_pi/raspiidx.htm

It"s going to be difficult to suggest anything without more info. HD44780/WS0010 compatibility aside (possible timing differences maybe) exactly what type of I2C interface? Is it an attached module** or part of the main board? Photographs may provide a clue.

That"s also true for the HD44780 but the "usual practice" is to wire the LCD module to be write only (so nothing is ever "read back") and introduce a software timing delay after writing a command or data as per the "longest time" necessary (hence my reference to "timing differences"). The "unknown" issue (w/o cross-referencing the datasheets) is whether there are significant differences between enabling and operating in 4-bit or 8-bit data transfer modes. Certainly for some other "HD44780 compatible" LCD modules I"ve observed different minimum E-strobe pulse lengths/delays over a number of module types/samples** and interface connection modes: http://www.cpmspectrepi.uk/raspberry_pi ... gData.html

The photo suggests it"s the E-strobe length/timing issues I mentioned in a previous post**. You (if you can) need to look at the source code for I2C_LCD_driver and "tweak" the relevant pulse length/delay values. (I"m not a Python programmer so cannot advise fully).

More likely the original Python program was only ever tested with a small number of LCD (and, perhaps not, OLED) modules of the same basic, type. I only discovered "the problem" because:

AFAICT, not being a Python programmer, and if I"m interpreting the sleep values correctly, they"re (like. for example, the equivalent 50uS values in similar, wiringPi, "C" code) somewhat generic and probably "work best" for direct GPIO connection and not via an I2C driven (PC8574-based) 4-bit interface. You could try changing them to values similar to those in my link posted previously (and those new values will also be O.K. for most, if not all, LCD modules - to date they haven"t need "re-tweaking" for any new samples I"ve tested - I"m awaiting delivery of an "uncommon" 16x4 line variant at the moment).

I bought one of these LCD panels today and soldered on an I2C module thinking it was going to be a straightforward replacement of my previous HDD44780 (as it"s described) and I"ve been encountering tons of problems.

raspberry pi 1602 serial blue backlight lcd module quotation

40 characters by 2 lines text display with font size 5x7 dots or 5x8 dots and cursor line. I2C, SPI or RS232/TTL serial interface. SPLC780D, SPLC782A,S6A0069, S6A0070, KS0066, KS0070B, NT7603H,NT7065, NT7066, ST7032 or equivalence controller driver. Contrast and brightness can be controlled by software. Positive/Neagtive, Transflective/Transmissive, Blue/Grey/Yellow-Green, W/O backlight, color of backlight and other options can be chosen.

raspberry pi 1602 serial blue backlight lcd module quotation

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