3-wire serial lcd module quotation

HD44780 based character LCDs require at least 6 I/O lines from microcontroller to display data. Therefore, they are not suitable for low-pin microcontrollers like PIC12F series microchips. In this project, I am going to show how to drive an HD44780 based LCD display with only 3 pins of a microcontroller. I am going to demonstrate it with PIC12F683 microchip. The character data and command from the microcontroller is transferred serially to a shift register (74HC595), and the parallel output from the shift register is fed to LCD pins.

In this project, SH_CP and ST_CP are tied together. So, if we want to receive a serially transferred 8-bit into parallel form at Q0-Q7, an extra clock pulse is required after transmitting the 8-th bit of serial data because the clocks are tied and the storage register is 1-clock behind the shift register.

All HD44780 based character LCD displays are connected using 14 wires: 8 data lines (D0-D7), 3 control lines (RS, E, R/W), and three power lines (Vdd, Vss, Vee). Some LCDs may have LED backlight and so they may have additional connections (usually two: LED+ and LED-).

Providing detail explanation of individual LCD pin doesn’t fall within the scope of this project. If you are a beginner with LCD, I recommend to read these two articles first from Everyday Practical Electronics magazine : How to use intelligent LCDs

The hardware part of this project is fairly simple. The challenging part is to write the driver software that is responsible for a proper sequence of operations required to serially transfer character data and command to 74HC595 serial-in parallel-out shift register. The shift register parallel output is then connected to LCD data lines (D4-D7) and RS control pin. This arrangement requires 3-pins of microcontroller to display character data on a parallel LCD display: 2 pins for providing Clock and Data to 74HC595, and 1 pin for enable control (E) pin of LCD module. Since the data transfer uses 4-bit mode, any 8-bit command or character data is sent in two steps: send the higher nibble first, and then the lower nibble. The R/W control pin is grounded, and therefore no data or status read from the LCD module is possible in this case.

The SH_CP (11) and ST_CP (12) clock inputs of 75HC595 are tied together, and will be driven by one microcontroller pin. Serial data from microcontroller is fed to the shift register through DS (14) pin. OE (13) pin is grounded and reset pin MR (10) is pulled high. Parallel outputs Q0-Q3 from 74HC595 are connected to D4-D7 pins of the LCD module. Similarly, Q4 output serves for RS control pin. If the LCD module comes with a built-in backlight LED, it can simply be turned ON or OFF through LED control pin shown above. Pulling the LED pin to logic high will turn the back light ON.

A first, a bit of data fed to DS pin of 74HC595 appears at Q0 output after 2 clocks (because SH_CP and ST_CP are tied). So, sending 4-bit data (D4-D7) and an RS signal require 6 clock pulses till they appear at Q0-Q4 outputs respectively. When the LCD module is turned ON, it is initialized in 8-bit mode. A number of initializing commands should be sent to operate the LCD module in 4-bit mode. All the driver routines that are discussed here are written in mikroC compiler. They work only for a 16×2 LCD module. User can modify the initialization operations inside the Initialize_LCD() routine to account for other LCD configurations. The driver routines and their functions are described below.

Write_LCD_Nibble() : Data or command byte is sent to the LCD module as two nibbles. So this function routine takes care for sending the nibble data to the LCD module.

At the beginning of your program, you need to define Data_Pin, Clk_Pin, and Enable_Pin to the chosen microcontroller ports. I am going to demonstrate here how to use these driver routines to display two blinking character strings, Message1 and Message2, at different locations. I am going to test our serial LCD module with PIC12F683 microcontroller. The test circuit is shown below.

ER-TFT035-6 is 320x480 dots 3.5" color tft lcd module display with ILI9488 controller,superior display quality,super wide viewing angle.As a bonus, this display has a optional resistive touch panel and a optional capacitive touch panel with controller FT6236, so you can detect finger presses anywhere on the screen and doesn"t require pressing down on the screen with a stylus and has nice glossy glass cover and 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 and hand-held equipment which requires display in high quality and colorful image.It supports 8080 8-bit,9-bit,16-bit, parallel,3-wire,4-wire serial spi interface. FPC with zif connector is easily to assemble or remove.Lanscape mode is also available.

This LCD module uses a 128x64 liquid crystal display that support Chinese character , English characters and even graphics. It can exhibit 4 lines and 12 English characters/6 Chinese characters per line. It is suitable for interactive work with Arduino.

The following sample is working under 3-Wire mode. It demonstrates how to display integers on the LCD screen. You will need the Arduino Library which can be downloaded here.

1) why bother wiring R/W to the shiftreg if you can’t actually read back through it? seems like a silly plan. keeping track of what’s on a 16×2 LCD in a micro isn’t exactly hard anyway, but i can’t think of a situation where i’ve ever needed to read back from a HD44780 panel. now a graphics LCD, that’s a different story.

3) ugh, you have to send the control byte three times? if you’re going to do 3-wire control, use an unlatched S/R and wire the LCD’s E line straight to the circuit. saves clock cycles – load the control byte then toggle E :)

i really should write up that tutorial on reverse engineering pinouts for controllerless graphics lcds with nothing more than a multimeter… and maybe document some of my PIC tricks too. argh, need more spare time!

Bought this from Robotshop retailer. Worked right away like a charm. I even changed splash screen to display my software version. However at some point it stopped displaying text, then backlight started spontaneously switching off several seconds after powering on. I connected LCD to different device and started experimenting just sending one command at a time.

My only complaint with this product is the difficulty in mounting. Finally had to drill out the holes to accept 4-40 standoffs. The Eagle files don"t include the complete board so making a screw hole template from the PCB is impossible. Otherwise works fine with my stand alone Atmega 328P using the SerLCD.h and SoftwareSerial.h libraries.

Does anybody know how to do a hard reset on this LCD? While I was uploading my code, I left it plugged into TX, and it doesn"t work anymore. I"m realizing that it probably got spammed with commands and the configuration got messed up. Does anybody know how to reset to factory defaults?

I have the same question. I now have the 3.3v serial enabled LCD (with backpack) and want to use this one for future usage. VDD of 5V can be supplied, but will the TTL work when its getting 3.3V signals from the TX from Netduino?

Is it just me, or are the solder holes for VDD, GND, and TX near the JST connector too small to accept standard pin headers? Perhaps I just need to use a little more force? I see that one of the pictures of this module shows what appear to be standard headers installed in that location, so I am confused..

I"ve put together some python code for sending serial data to these LCD screens. In particular, the code pulls my twitter status and writes it to the LCD. To work with the extra characters, I wrote functions to page the text (vertical scroll) or scroll the text (horizontal scroll). Details are available here: http://dawes.wordpress.com/2009/12/23/twitter-to-lcd/

Is it possible to wire this up in parrellel rather than use the serial function? I ran into a snag and am unable to use the serial function of this lcd? I see the pinouts on the schematic but when wired it doesn"t seem to work.

I"ve created a new splash screen for the Serial LCD, now I want to save it to the Serial LCD memory. So, exactly how do I write a "control-j" to the Serial LCD. I"ve put in the required line to transmit special character 124, but I can figure out how to format the "control-j" line of code. I"ve Googled this for about an hour and can"t find an explanation or sample code anywhere. Here"s my code...void setup() {

I"m not sure if you"re referring to comments on the website, or on your LCD screen. You can contact techsupport@ and they"ll be able to assist you further.

I have used a Labview program for this LCD. When i send character "a", the display is "0". Does anyone having a same problem. How should I troubleshoot this problem.Tq

Why do I get power out of the VDD port with only RX and GND hooked up? I have a 5V rail that I use to power everything on my board - and when I added this SerLCD I now have a bridge between the arduino power and my 5v line ... which I dont want. Can I add a diode to the VDD to stop reverse voltage from powering my board?

It seems like the MCLR function has been disabled through the config bits. No pullup to Vdd is installed. This makes it really irritating to work with this display. Programming an arduino with this hooked the HW serial port will screw up the display, and without the reset line you have to pull power. A simple solution would just be to wire the PICs MCLR pin to the Arduinos reset line, but this isn"t possible without the MCLR function obviously.

Quick suggestion... It"d be very helpful for some people if you guys added a note in the description pointing people to the correct 3-pin JST jumper wire to be used with these serial LCDs. Two reasons... it"s not clear that the jumper is not included, and you have 3-pin jumpers in your catalog which don"t work with this serial LCD.

I have ported LiquidCrystal library for use with the serial LCD you can look at my code here. Still working on finishing all the documentation. But putting up for now hopefully someone will find it usefull.

I"m also having the same problem after accidentally sending the control character "|" followed by "\", "-", "/" to the LCD as I was trying to animate a rotating bar to indicate a busy status.

Does the serial version of the display still have the parallel pins available on it? I would like to use the serial access for the most part, but I might need regular old parallel for one project.

I"m asking b/c I"m in a space constrained situation where the serial backpack just isn"t going to fit. The datasheet (2.5) shows a picture with a backpack (soldered on?), but nothing else on this page suggests that any backpack is required to talk with this device thru 3-wire serial.

I"m asking b/c I"m in a space constrained situation where the serial backpack just isn"t going to fit. The datasheet (2.5) shows a picture with a backpack (soldered on?), but nothing else on this page suggests that any backpack is required to talk with this device thru 3-wire serial.

Having ordered this exact LCD myself, I can say that aside from the issue mentioned in my other comment, it looks exactly like the picture. No bulky backpack module, everything is on a single board. Pretty sleek, really.

Hi...noob question. how do i send data on the fly via arduino? it only has 1 connection to tx. i tried using the serial monitor to send something, but it doesnt work...im looking for something which i guess is similar to liquidCrystal->SerialDisplay example.

I have a couple of suggestions for a future version: On the PCB layout, please add a thermal to the ground pin for the user connectors to make it easier to hand solder. Please change the firmware to make it more difficult for a random serial stream to stumble upon a configuration sequence. Maybe pick a non-printable prefix character like ESC instead of the vertical bar. Please make the brightness values more user friendly, like 1, 2, 3, etc. Maybe have an option to make the display scroll when it gets full, instead of resetting the cursor to home and overwriting. All-in-all, a fun little platform. Thanks for using a PIC on this one! I think I may try my hand at writing some new firmware for it. Cheers!

Edit: Got mine fixed. If you checked the soldering on all the terminals, check them again. I also sometimes was getting strings of garbage if I wriggled the terminals on the LCD (I suspect because I was getting a partial connection on the bad terminal). Resoldered and it is working fine now.

Wait, so I get the 3 pins for power and control, but whats with all the other pins on the sides? Can it be used to control another LCD besides the one built in?

The other pins are used if you want to control the LCD without using the serial standard. There"s some tutorials on how to do that with the arduino below. You have more control over what you can do with it, but it takes up more pins on the arduino. If you want to wire it up this way, don"t spend the money on the serial interface, they have cheaper LCD"s that allow you to do it this way, without the serial.

The IO-204 has two ways to output serial - one directly out of a channel and the other is thru a serial smart board. If you see "SO=" then the widget was using the smart board protocol. Using a Serial Out widget under "I/O Channel Widgets". I hope that helps out.

LCD module is widely used in Healthcare Biomedical Instrumentation,and clinical diagnostics,Wind Sensors for Measurement,Control, Alarm, Internet Access,metering pumps and dosing systems,water treatment ,charging pile and car beauty equipment andIndustrial control equipment, instruments and meters, bank terminal,industry machinery equipment as well as electrical home appliances, consumer electronics including white goods, POS system, home applications, industrial instrument, automation, audio/visual display systems, and medical device ect.

Shenzhen Brilliant crystal Technologic Co.,ltd a professional Character and Graphic LCD manufacturer.graphic LCD displays (liquid crystal display) are available in dot matrix format of graphic resolution including 122x32, 128x64, 128x128, 256x64, 160x128, 160x160, 160x32, 160x80, 192x64,240x128 dots 240x64, 320x240 and etc. The sizes are including 3" LCD, 3.2" LCD, 4" LCD Display, and etc. Graphic LCD modules are including different options of polarizer in reflective, transmissive or transflective types. Our LED backlights are available in various colors including yellow/green, white, blue, red, amber and RGB.

An important aspect to consider when working with electronic devices is the type of data communication protocol they use. Serial communications are widely utilized in the electronics industry due to their relative simplicity and low hardware requirements compared to parallel interface communications.

RS232 (Recommended Standard 232) is a serial binary data communication standard introduced in 1960. The standard defines pins and signals connecting between a data terminal equipment (DTE) and a Data Communications Equipment (DCE).

The scope of the RS232 standard defines electrical, functional, and mechanical signal characteristics of point-to-point serial data communication between the Data Terminal Equipment (DTE) and the Data Communications Equipment (DCE).

RS232 TTL is a term used to refer to a type of serial communication protocol that uses RS232-type specifications but with logic signals compatible with TTL (transistor-transistor logic) circuits. The voltage levels of TTL serial communication always stay between 0V (logic 0) and Vcc (logic 1, which is typically 3.3V or 5V).

RS232 is no longer the primary standard across consumer products due to existing newer and more advanced technologies like USB. However, the RS232 standard is still used in industrial and commercial applications with simple serial data communication requirements, such as industrial controls, automation equipment, network communications, robotics, and medical equipment.

RS232 is a low-cost serial interface compatible with many new and legacy devices, is easy to implement, has simplified wiring, and has good immunity to EMI. Some of the RS232 disadvantages are low data communication speeds, negative and positive signal voltages can complicate power supply design, limited to single master and single slave, and its unbalanced transmission can be prone to noise.

RS232 is an excellent choice for applications requiring simple, low-speed serial communication. Although the original purpose of the standard was to connect a terminal with a modem, it has been used beyond the scope of its original purpose due to its simplicity and relatively low cost.

Winstar WF35R is a 3.5 inch diagonal full color QVGA 320x240 TFT LCD module. This module is built in with SSD2119 IC; it includes the controller and driver IC functions and supports lots of different interfaces: 8/ 9/ 16/ 18-bit 6800-series and 8080-series parallel interface, 3-wire or 4-wire SPI, 18-bit/6-bit RGB interface. Since the WF35R doesn’t require control-board to drive MCU parallel and SPI interface, the advantage of WF35R is having competitive price than other TFT models which are require control-board on module. Below is the basic spec information for WF35R, please contact with us if you need further detailed information.

Winstar WEO012864C is a small OLED display which is made of 128x64 pixels, diagonal size only 0.96 inch. The WEO012864C has the outline dimension of 26.70 x19.26 mm and AA size 21.74 x10.86 mm; it is built in with SH1106G controller IC and it communicates via 6800/8080 8-bit parallel, I2C and 4-wire serial interface. The WEO012864C is a small COG OLED display which is ultra thin (only 1.65mm); lightweight and low power consumption. It is suitable for handheld instruments, meters, mp3, wearable device, IoT, etc. The standard emitting color for this item is yellow, but options are available in white and sky blue.

WEO012864C module can be operating at temperatures from –40℃ to +80℃; its storage temperatures range from -40℃ to +80℃. Below is the basic specification of WEO012864C as reference. For any further information such as samples or quotation, please contact with our sales rep.

WO256128A is a monochrome graphic LCD module made of 256x128 pixels, diagonal size 2.9 inch. This LCD Module WO256128A is built in with ST75256 controller IC, it supports 6800 8-bit, 8080 8-bit parallel and 4-wire serial SPI and I2C interface. The WO256128A is having the same outline dimension, and VA size and same power supply 3.3V as WO12864D3, but is having a much higher resolution and performance. The WO125128A is an upgrade version of WO12864D3 to meet with the customers’ requirement on higher resolution and the best thing is that the customers don’t have to change the mechanical design for their applications.

This module can be operating at temperatures from -20℃ to +70℃; its storage temperatures range from -30℃ to +80℃. The WO256128A is available for different LCD mode options, STN Negative, FSTN Negative (Double film) and FSTN positive and with LED backlight options, like white LED. Please contact with us if you need different LCD type and LED combination.

Sharp’s Memory LCD is the perfect solution for compact handheld, wearable, and other small-screen applications. Embedded, 1-bit memory in every pixel allows for an always-on display capable of delivering high-contrast, high-resolution content with ultra-low power consumption. A lightweight, two-glass design plus an integrated driver in the panel provides an exceptionally thin module. Incorporating the Memory LCD into a design is simple with 3-wire SPI serial interface (SI, SCS, SCK).

Extension cables are used to extend the length of a 3-wire cable such that a motor or motor controller can be farther from a VEX ARM® Cortex®-based Microcontroller 3-wire application.

3-Wire Extension Cables are available in lengths of 6, 12, 24 or 36 inches. 4-packs are available for each size. There is also a 3-Wire "Y" Cable available in a length of 6". "Y"-cables allow 2 motors or servos to be driven by a single output.

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This LCD module uses a 128x64 liquid crystal display that support Chinese character,  English characters and even graphics. It is suitable for interactive work with Arduino.

It features a backlit control, pallerlel or serial control, contrast adjust. It can be connect to our interface shield for arduino via IDC6 socket and Cable for Shiftout.

The LCD is shipped in Pallelel mode in default.  The R9 is used to set the interface mode. To switch to SPI mode, the R9 resistor need to be moved to R10