lcd module 16x2 pdf quotation

Due to a typing error, we have been selling the “CFAH1602L-NFG-JT” as a “CFAH1602L-NFH-JT”. This mistake has now been corrected. Changing the “H” to “G” indicates that this display module has a reflective polarizer, not a transflective polarizer. This display has always had a reflective polarizer.

The LCDduino board enables users to create many applications/projects that require a 16×2 LCD display and Arduino. The board has the exact size of 16×2 LCD and can be installed on the backside of the LCD. This is a low-cost solution that has onboard Arduino + LCD so no extra Arduino Nano or Arduino board is required. The Arduino compatible hardware includes onboard programming and boot-loader connectors, Atmega328 microcontroller, and 16×2 LCD interface. Each Arduino I/O Pin including the VCC and GND is exposed to the connectors for easy connection with sensors and other devices. The board enables the easy interface of many devices and sensors. The operating power supply is 7 to 15V DC.

The Displaytech 162M series is a lineup of our largest 16x2 character LCD modules. These modules have a 122x44 mm outer dimension with 99x24 mm viewing area on the display. The 162M 16x2 LCD displays are available in STN or FSTN LCD modes with or without an LED backlight. The backlight color options include yellow green, white, blue, pure green, or amber color. Get a free quote direct from Displaytech for a 16x2 character LCD display from the 162M series.

The Displaytech 162M series is a lineup of our largest 16x2 character LCD modules. These modules have a 122x44 mm outer dimension with 99x24 mm viewing area on the display. The 162M 16x2 LCD displays are available in STN or FSTN LCD modes with or without an LED backlight. The backlight color options include yellow green, white, blue, pure green, or amber color. Get a free quote direct from Displaytech for a 16x2 character LCD display from the 162M series.

16×2 LCD is named so because; it has 16 Columns and 2 Rows. There are a lot of combinations available like, 8×1, 8×2, 10×2, 16×1, etc. But the most used one is the 16*2 LCD, hence we are using it here.

All the above mentioned LCD display will have 16 Pins and the programming approach is also the same and hence the choice is left to you. Below is the Pinout and Pin Description of 16x2 LCD Module:

These black circles consist of an interface IC and its associated components to help us use this LCD with the MCU. Because our LCD is a 16*2 Dot matrix LCD and so it will have (16*2=32) 32 characters in total and each character will be made of 5*8 Pixel Dots.  A Single character with all its Pixels enabled is shown in the below picture.

So Now, we know that each character has (5*8=40) 40 Pixels and for 32 Characters we will have (32*40) 1280 Pixels. Further, the LCD should also be instructed about the Position of the Pixels.

It will be a hectic task to handle everything with the help of MCU, hence an Interface IC like HD44780 is used, which is mounted on LCD Module itself. The function of this IC is to get the Commands and Data from the MCU and process them to display meaningful information onto our LCD Screen.

The LCD can work in two different modes, namely the 4-bit mode and the 8-bit mode. In 4 bit mode we send the data nibble by nibble, first upper nibble and then lower nibble. For those of you who don’t know what a nibble is: a nibble is a group of four bits, so the lower four bits (D0-D3) of a byte form the lower nibble while the upper four bits (D4-D7) of a byte form the higher nibble. This enables us to send 8 bit data.

As said, the LCD itself consists of an Interface IC. The MCU can either read or write to this interface IC. Most of the times we will be just writing to the IC, since reading will make it more complex and such scenarios are very rare. Information like position of cursor, status completion interrupts etc. can be read if required, but it is out of the scope of this tutorial.

The Interface IC present in most of the LCD is HD44780U,in order to program our LCD we should learn the complete datasheet of the IC. The datasheet is given here.

There are some preset commands instructions in LCD, which we need to send to LCD through some microcontroller. Some important command instructions are given below:

The Hitachi HD44780 LCD controller is an alphanumeric dot matrix liquid crystal display (LCD) controller developed by Hitachi in the 1980s. The character set of the controller includes ASCII characters, Japanese Kana characters, and some symbols in two 28 character lines. Using an extension driver, the device can display up to 80 characters.

The Hitachi HD44780 LCD controller is limited to monochrome text displays and is often used in copiers, fax machines, laser printers, industrial test equipment, and networking equipment, such as routers and storage devices.

Compatible LCD screens are manufactured in several standard configurations. Common sizes are one row of eight characters (8×1), and 16×2, 20×2 and 20×4 formats. Larger custom sizes are made with 32, 40 and 80 characters and with 1, 2, 4 or 8 lines. The most commonly manufactured larger configuration is 40×4 characters, which requires two individually addressable HD44780 controllers with expansion chips as a single HD44780 chip can only address up to 80 characters.

Character LCDs may have a backlight, which may be LED, fluorescent, or electroluminescent. The nominal operating voltage for LED backlights is 5V at full brightness, with dimming at lower voltages dependent on the details such as LED color. Non-LED backlights often require higher voltages.

Character LCDs use a 16 contact interface, commonly using pins or card edge connections on 0.1 inch (2.54 mm) centers. Those without backlights may have only 14 pins, omitting the two pins powering the light. This interface was designed to be easily hooked up to the Intel MCS-51 XRAM interface, using only two address pins, which allowed displaying text on LCD using simple MOVX commands, offering cost effective option for adding text display to devices.

Selecting 4-bit or 8-bit mode requires careful selection of commands. There are two primary considerations. First, with D3–D0 unconnected, these lines will always appear low (binary 0000) to the HD44780. Second, the LCD may initially be in one of three states:

Hi, I"m brand new to LCDs and Raspberry Pi GPIO. I"ve wired up a LMB162ABC 16x2 LCD that came in an Arduino Uno kit from Maker Faire. I"ve used just any open GPIO pins that I wanted figuring it doesn"t matter which ones I use as long as they are GPIO, is that correct? I want to operate in 4 bit mode so I have wired it accordingly. I get the screen to come on and the contrast variable resistor works and one row lights up solid blocks. I have tried a few python code examples and even adjusted the pins in the code to match the GPIO pins I chose and no matter what I do I cannot seem to get the dispaly to do anything (besides the solid row of blocks). Can someone please assist me with some super basic code or what I may be doing wrong? Here"s a link to a PDF of the specs for the LCD I"m using if it helps. http://www.datasheetdir.com/LMB162ABC+download

I tried Adafruit_CharLCD.py, nothing happened, wondering if the LCD it was written for was different and that"s why it"s not working...? I also posted this in the LCD screen section of the forum because I"m not really sure which area is a better fit for my issue.

I don"t see anything obviously wrong (my Python knowledge is very weak). These LCD devices are a pig to debug as you need everything correct to get any output.

Rezendes wrote:Hi, I"m brand new to LCDs and Raspberry Pi GPIO. I"ve wired up a LMB162ABC 16x2 LCD that came in an Arduino Uno kit from Maker Faire. I"ve used just any open GPIO pins that I wanted figuring it doesn"t matter which ones I use as long as they are GPIO, is that correct? I want to operate in 4 bit mode so I have wired it accordingly. I get the screen to come on and the contrast variable resistor works and one row lights up solid blocks. I have tried a few python code examples and even adjusted the pins in the code to match the GPIO pins I chose and no matter what I do I cannot seem to get the dispaly to do anything (besides the solid row of blocks). Can someone please assist me with some super basic code or what I may be doing wrong? Here"s a link to a PDF of the specs for the LCD I"m using if it helps. http://www.datasheetdir.com/LMB162ABC+download

I tried Adafruit_CharLCD.py, nothing happened, wondering if the LCD it was written for was different and that"s why it"s not working...? I also posted this in the LCD screen section of the forum because I"m not really sure which area is a better fit for my issue.

If you have wiringPi, then there is some sample code there in C to drive these displays - see http://wiringpi.com/dev-lib/lcd-library/ for the details - and even if not programming in C it might be enough to double-check the wiring, display, etc.

Thanks for the replies, I have checked the physical connections a few times and they look fine. The display is 5v and I have made sure to Ground the R/W pin on the LCD. I did search and find that thread already and I have tried that code as well. I can"t imagine there are issues with all the code I have tried. I must have a physical problem... I will take some pictures of my wiring and use an ohmmeter to check each connection for sure.

I am about to buy another LCD to test and make sure it"s not the LCD I have that"s the problem. The image here for the wiring of this LCD http://www.amazon.com/microtivity-IM161 ... icrotivity suggests a Diode on pins 15 and 2 pointing towards 15... Do I need that? That seems to be power to the LCD and power to the Backlight, my backlight powers up and my contrast adjustment works with the single row of solid blocks on screen... what exactly is pin 2 providing power for on the LCD?

W.r.t. to the initialisation process, have you seen the HD44780U datasheet? (The relevant diagrams for 8-bit and 4-bit interfaces are figures 23 & 24**) Are you connecting the LCD directly to the Pi"s GPIO"s or, if it"s a 5V display, are you, like me, using level-shifters (see the links in my previous post)?

W.r.t. to the initialisation process, have you seen the HD44780U datasheet? (The relevant diagrams for 8-bit and 4-bit interfaces are figures 23 & 24**) Are you connecting the LCD directly to the Pi"s GPIO"s or, if it"s a 5V display, are you, like me, using level-shifters (see the links in my previous post)?

i use 4 bit, i think i have connected pins D4 to D7 right though there is no pull up or pull down resistors for D0 to D7 i don`t how should i do that. i personally have doubts about LCD`s solder too, although it shows no short circuit.