We’ve updated our excellent character LCD tutorial to include a section about RGB-backlit LCDs, with wiring images, video and example code!
Arduino Tutorial – connecting a parallel LCD - [Link]
Using VFD display with Arduino – [via]
Summer of 2010 I picked up an Arduino board from adafruit and took some time to walk through all of the tutorials available with it. Since then I have spent most of my time on other projects including my bachelor’s. Recently I have obtained the Motor Party Pack, LoL Shield Kit, and a 20×2 VFD (Vacuum Fluorescent Display) to go with the original board so my interest is sparked again. I have found that the Motor Party Pack and LoL Shield have adequate instruction and tutorials, but the VFD is lacking in beginner level instructions to get started. As such I have decided to write a tutorial for the 20×2 VFD available through adafruit.
The adafruit VFD is made by Samsung and is model No. 20T202DA2JA, this is really unimportant though as adafruit is nice enough to link you to the spec sheets for both the module and the controller chip. What you would be looking for is the pin-out found on page 4 of the module controller sheet.
Using VFD display with Arduino - [Link]
Check out this Sharp “Memory LCD”
Memory LCD Technology
Display technology advances such as LED backlighting have dramatically changed the game of LCD power consumption. However, the power requirements of some conventional LCDs can still be high enough to limit their usage pattern or usage environment.
The industry’s first incarnation of memory LCD technology yielded cholesteric, electrophoretic, and other bi-stable technologies. However, these types of displays require relatively high driving voltages and considerable time to respond, in some cases requiring most of a second to update display images. They are also extremely limited in the amount of content they can display at one time.
Electrophoretic displays have also been known to experience image retention. Some current display technologies eliminate this possibility by designing a display to update twice. The first update is with a negative image to completely switch states in the display, and the second update is with the new positive image. Thus, the true update (or “refresh”) rate in a typical application of this type may actually be twice that which is stated in its specifications. Due to this, even though electrophoretic displays do deliver energy savings when holding state, power drain during image updates is a real concern. Read the rest of this entry »
Today we have repaired a LCD Monitor Samsung with model no: 940NW, came with symptoms that will not to turn on and the led is blinking.
I opened it and saw that the electrolytes in the position C109 (1000uF/25V) ,C110 (1000uF/25V) and C113 (820uF/25V) are cracked and then I replaced them..
Repairing LCD Monitor Samsung 940NW - [Link]
Today we have repaired the Samsung LCD monitor with model no: 943NW , he come with symptoms that monitor off after 2 seconds.
I opened it and saw that the electrolyte (100uF/400v) cracked, then I replaced the new capacitor, but the problem is still here, the monitor turns off after 2 seconds, I tried the other new CCFL lamps but now shuts down after 30 sec, in that period as the monitor for i felt that the inverter transformer smell the melted plastic.
Repairing LCD Monitor Samsung 943NW – [Link]
Tic Tac Touch @ The Custom Geek… [via]
OK, so I haven’t posted in a while because I have been working on some bigger projects, but yesterday, I took a two hour break and made a 2 player tic tac toe game. I did this with an Arduino and a 2.8″ touchshield from Adafruit.com. It’s pretty basic tic tac toe, and has score tracking, game logic (you can’t go twice in a row, and telling you if you win), and the ability to consume a chunk of time playing tic tac toe with my son. Below is the code, feel free to hack modify etc. If you play against a smart person (or yourself), you will have lots of Mosfet eye games!
Tic Tac Touch - [Link]
follower presents his project using a USB accessory to create a “dual screen” Nexus One with SMS notification & time display. Besides the Nexus One phone, the hardware consists of an Arduino Duemilanove with ATmega328, a SparkFun USB Host Shield and 2×16 LCD display. This hack is made possible by Android’s Open Accessory API. [via]
The sketch listens for bytes sent over the USB connection and displays them on the LCD–it special-cases two values to determine which row of the display text should be displayed on.
The Android App is invisible and starts automatically when you connect the accessory. (You probably need to approve the running of the application within a few seconds or the accessory may time out.) A background service is started which displays a notification of the accessory found, listens for new text messages and starts sending the current time to the accessory for display. You can use your phone as normal while the service is running in the background.
When the accessory is disconnected the notification is removed and the background service cleans up after itself before stopping.
Full source code and further details are available at follower’s labradoc webpage.
Dual-screen Nexus One – [Link]
civicbynature writes -
Thanks to jersagfast @ TheCustomGeek. He wrote an awesome menu program for adafruits 2.8tft breakout board. It has 5 different menu areas as well as a settings area for backlight brightness and sleep timers which saves the settings to EEPROM so the settings are saved even when there’s no power. Plus many more features. I have added many updates. It is now both UNO and Mega 1280/2560. compatible.
I have also added the ability to read actual Vcc voltages at the core using the Bandgap method For accurate voltage readings and sensor readings. And more. If you’d like to check out the latest code it’s available Here on my site.
Cool 2.8″ TFT Touch project… - [Link]
Send a Tweet to Your Office Door @ IEEE Spectrum Erico writes – [via]
Here at IEEE Spectrum, staffers routinely put Post-It notes on their doors and cubicles to let colleagues know they’re out. But you can’t slap a note on your door if you decide to work at home at the last minute—which, as I learned this winter, happens quite often when you have a very pregnant wife about to go into labor any instant.
That’s why I set out to replace those yellow sheets of self-adhesive stationery with something less, uh, analog—something that would allow me to post the updates electronically. An idea then popped up in my head: Twitter for my door.
It turns out to be a simple DIY project that an experienced hobbyist can complete in a few hours. Or if you’re me and this is your first serious hardware project, it might take you a couple of months and nearly drive you insane.
It worked out in the end. Now, when I’m home—or actually anywhere with my phone—I can send a tweet to a small LCD that hangs by my door, thus keeping my coworkers informed of my whereabouts. The LCD also shows current weather conditions in New York City; I thought my colleagues would appreciate this value-added service.
Send a Tweet to Your Office Door - [Link]
HOW TO – build a $23 graphic LCD shield… from thoughtfix in the Adafruit customer forums.
All I did was follow the instructions for the Nokia 5110 LCD EXACTLY how they were described at http://ladyada.net/products/nokia5110/ with two notable exceptions. First, I used +5V (shown in the pink wire in the drawing, white wire on the results) for the LED backlight. Second, I followed the pin traces around the proto shield used in the example and built that onto the underside of the Adafruit proto shield!
I had difficulty with the wire at such short runs. Specifically, I had insulation shrinking when I set the soldering iron hot enough to melt the solder to the wires. A more experienced person (or higher quality wire insulation) could avoid this. The LED uses one of the +5V rail connectors on the Proto Shield’s PCB and the “open” rail gathers 3.3V to share with the LCD and the driver.
HOW TO – build a $23 graphic LCD shield - [Link]