Description: This is the latest evolution of our serial LCD. Included on a single board is a 20x4 LCD and an embedded circuit based around a PIC 16F88. The on-board PIC takes a TTL serial input and prints the characters it receives onto the LCD. The installed firmware also allows for a number of special commands so you can clear the screen, adjust the backlight brightness, turn the display on/off, and more.
Communication with SerLCD requires 5V TTL serial at a default baud rate of 9600bps (8-N-1). You can adjust the baud to any standard rate between 2400 and 38400bps. The power (VDD), ground (GND) and RX pins are all broken out to both a 0.1" pitch header as well as a 3-pin JST connector.
SerLCD has the ability to dim the backlight to conserve power if needed. There is also a potentiometer on the back of the display to adjust the contrast.
This LCD makes for a great gift, because it can be used for so many different projects! For more gift ideas check out the SparkFun Gift Guide!
Based on 15 ratings:
1 of 1 found this helpful:
It works as I expected it to. There are wires on the one pictured, probably so “Hello World!” could be displayed, but mine did not come with wires so I had to solder some on.
1 of 1 found this helpful:
This is one of the those products that works as expected right out of the box. It was really easy to hook up a 9600 baud UART to it and start printing characters.
Unfortunately its just as easy to break. Because it has no I/O lockout on boot, it saves all settings on EEPROM between boots and because it is controlled using embedded control characters rather than either a dedicated control line, it will often read garbage characters during connection/disconnection and power cycles as control sequences and do everything from disabling the backlighting to changing baud rate. And there is no way (no obvious documented way that I can tell) to factory-reset it EXCEPT by using the UART interface, which is dodgy at best. Good luck ever recovering this thing once it reaches the tell-tale solid black 1st and 3rd lines.
This is an issue with which we are familiar. One of our techs wrote up the quick fix in the comments of the Quick Start Guide. Have a look here, it should help!
1 of 1 found this helpful:
I have owned one of these displays for about 5 months now I haven’t had any problems since I completed writing my own object to control this display. I had several problems with my own code initially that resulted in dark first and third lines or random characters like the other reviewers but I was always able to reset my serial connection speed to 9600 baud using the instructions provided with it. Now that all of my control functions are working properly it has been displaying exactly what it is supposed to
3 of 5 found this helpful:
I’ve bought about a over a dozen of these. All but three have gone bad. Symptoms are an all black screen or black lines across the first and third lines.
Hi there, So sorry to hear that you are running into this issue. It is common that if you leave these units connected to the UART, the programming of the control processor will scramble the LCD processor code. This is recoverable, however, this is not a defect of the unit. The best way to avoid causing this issue is to use a software serial setup to move your LCD communication lines to a different set of IO pins other than the hardware UART lines. If you find that you have put your screen into this state contact our tech support team and they can help you with directions on how to recover the module.
1 of 2 found this helpful:
I agree with the previous reviewer on the quality of these. I’ve only run them from Arduino’s and after awhile the serial input program seems to fail. It now turns on and shows the Sparkfun splash screen but any serial input shows vertical lines. If I unplug the screen and hook up another Sparkfun serial screen it shows the proper info. While it worked I really enjoyed the serial function.
Hi, Thank you for your inquiry. We are on the point of installing the LCD displays and, therefore, cannot give you any feedback yet. Do you sell the same LCD displays 20 x 4 LCD black on white 5 volts? Please send me the part number. Best regards Juergen
Hi Juergen, I’m afraid we don’t currently offer a 20x4, black on white, 5V LCD Display.
This product is ALMOST the greatest thing ever…Almost.
For me, this is not simply a serial display, this is a ready made breakout board for the PIC16F88…. BUT NO.
If only the designer had broken out the UNUSED TX Pin…. WHY WHY WHY WHY was this pin left “NC” (as per the diagram)…its already there, you have broken out every other pin…. SF Engineer: “lets not break out the TX pin to mess with them”…. I swear there must be a conspiracy behind this. So: 4 stars…
Other than that, this board works just fine, and was exactly what I needed. I wrote a brief serial “driver” to control it because I did not like the user interface with the special characters, commands and cursor positioning and other things. http://www.ccsinfo.com/forum/viewtopic.php?t=55546
….that TX Pin though.
I found this display straight forward and easy to work with. And no additional libraries to bloat your code. After a little study of the info available thru Sparkfun, the darn thing worked as intended the very first time. Spend a little time with the spec sheet, you’ll be way ahead. Nice display.
Very simple to use with only 3 cables
I thought I was going to be immune from the bricking issue already described (1st and 3rd lines all blocks) by using Serial2 on the Mega.
After months of reliable operation using the basic clear screen, move cursor, etc. commands, I thought I would reprogram the splash screen.
That’s when the problems began and I bricked the display. I attempted the recovery procedure, but since I was not getting the default splash screen I knew there was a little chance of successful recovery.
If I were to do it again, I would probably get the standalone backpack board so that it can be trashed if bricked, while keeping the LCD.
Suggestion… Change the firmware and expose some header pins or a switch so that recovery can happen under almost any conditions.
I bought three of these displays. I got two of them to work. One of the displays would only give me gibberish on the display. I tried using different baud rates thinking that the default was changed. I tried resetting the baud rate. Nothing really worked. So I am sending that one back. The other two though work great.
In the Arduino documentation for connecting to the display, they allude that you can use their SEN-08733 JST 3 pin connector with the LCD. You can as a matter of fact, but you need to pay attention to the wiring. Normally +5vdc is red and power supply return is black while yellow is your serial communication line. This is how the 16x2 serial LCD displays are set up. Well, pins one and three are swapped on this display. So you can either swap the wires around on the connector or use red as your communication wire and yellow as your +5vdc wire. You just need to pay attention to how you hook it up.
Also, the “SparkFun SerLCD v2.5 Application Note” does not have clarity on the cursor position addresses. It just indicates that the addresses are 0x80+n. That is sort of true but the addressing is not contiguous as one might assume. Therefore you need to pay attention to the “SerLCD v2.5” datasheet which indicates the “viewable” cursor position for a 20x4 display in it (page 3).
Other than that, these guys are fun to program and play with. I set the baud rate to 38.4kb so I avoid program slow downs when displaying data and messages. It works very much the same as the 16x2 serial display (with exception to the wiring of the power and signal lines and the extra addresses for more cursor positions).
It is very simple to program once your used to generally programming character based LCD’s. They are lots of fun.
The board works as expected and the hardware interface is easy to accomplish. The software is intuitive.
Easy to hook up and reasonable quality and price. Would like more support in terms of programming language to perform various tasks. I’m a Picaxe fan and there is no help specific to Picaxe. But I was able to fumble around and figure it out.
Would like to see someone like myself write up a support document which uses “English” to explain various programming terms. Just a thought.
Pretty simple to operate. Great tutorial to go with it.