July 18, 2013 AT 10:32 am

Adafruit display on open energy monitor

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Adafruit display on open energy monitor….

Display is 2.2” TFT from @adafruit on custom pcb with attiny84, rfm12b and LDL to adjust display brightness…


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2.2″ 18-bit color TFT LCD display with microSD card breakout. This lovely little display breakout is the best way to add a small, colorful and bright display to any project. Since the display uses 3-wire SPI to communicate and has its own pixel-addressable frame buffer, it can be used with every kind of microcontroller. Even a very small one with low memory and few pins available!

The 2.2″ display has 220×176 color pixels. Unlike the low cost “Nokia 6110″ and similar LCD displays, which are CSTN type and thus have poor color and slow refresh, this display is a true TFT! The TFT driver (HX8340BN) can display full 18-bit color (262,144 shades!). And the LCD will always come with the same driver chip so there’s no worries that your code will not work from one to the other.

The breakout has the TFT display soldered on (it uses a delicate flex-circuit connector) as well as a ultra-low-dropout 3.3V regulator and a 3/5V level shifter so you can use it with 3.3V or 5V power and logic. We also had a little space so we placed a microSD card holder so you can easily load full color bitmaps from a FAT16/FAT32 formatted microSD card.

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