The ESK-16D35A-C00 is an evaluation board for Holtek constant current LED driver HT16D35A . The board includes 144 RGB LEDs (in 8 x18 matrix) and two HT16D35A ICs. An external MCU can control the LED display and effects of the board with the 3-wire SPI interface.
The Holtek HT16D3x constant current LED driver IC series integrate a PWM illumination control function, fade effect and rolling functions. In having the above features, they are suitable for use in applications such as mood lights, selfie lights, gaming keyboards, rhythm lamps, Bluetooth LED speakers, mobile phones backlights and home appliances which have color display panels.
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The HT16K33 is a memory mapping and multi-function LED controller driver. The max. Display segment numbers in the device is 128 patterns (16 segments and 8 commons) with a 13*3 (MAX.) matrix key scan circuit. The software configuration features of the HT16K33 makes it suitable for multiple LED applications including LED modules and display subsystems. The HT16K33 is compatible with most microcontrollers and communicates via a two-line bidirectional I2 C-bus.
I originally wrote drivers for a variety of HT16K33-based displays which were using in Electric Imp projects like those mentioned above, and last year a did quick and dirty ports to Micropython and Circuitpython. They worked, but they were rough around the edges. Time then to put them into some sort of order and, ideally, into code capable of supporting either version of embedded Python.
As explained on my MAX7219 page, there are a some restrictions on 7 segment displays, and all this restrictions are still true for the HT16K33 library. This is a limitation of the LED display itself, not the driver chip. Obviously 14 segment displays can show much better characters.
Another alternative comes from Arduino forum user HKJ-lygte. He provides a generic LED display driver "library" and the HT16K33 is just one out of many supported ICs. I liked his idea to split the hardware definition of each LED segment from the character set / font table. But there are a lot of precompiler #defines and I prefer to use the Arduino "standard" I2C library "wire.h" for my projects. His homepage is worth a visit because he has a very comprehensive collection of available LED displays.
What's better than a single LED? Lots of LEDs! A fun way to make a small display is to use an 8x8 matrix or a 4-digit 7-segment display. Matrices like these are 'multiplexed' - so to control all the seven-segment LEDs you need 14 pins. That's a lot of pins, and there are driver chips like the MAX7219 that can control a matrix for you but there's a lot of wiring to set up and they take up a ton of space. Here at Adafruit we feel your pain! After all, wouldn't it be awesome if you could control a matrix without tons of wiring? That's where these adorable LED matrix backpacks come in. We have them in two flavors - a mini 8x8 and a 4-digit 0.56" 7-segment. They work perfectly with the matrices we stock in the Adafruit shop and make adding a bright little display trivial.The matrices use a driver chip that does all the heavy lifting for you: They have a built in clock so they multiplex the display. They use constant-current drivers for ultra-bright, consistent color (the images above are photographed at the dimmest setting to avoid overloading our camera!), 1/16 step display dimming, all via a simple I2C interface. The backpacks come with address-selection jumpers so you can connect up to four mini 8x8's or eight 7-segments (or a combination, such as four mini 8x8's and four 7-segments, etc) on a single I2C bus.The product kit comes with:
There are many inexpensive 4-digit 7-segment LED displays available but these usually require some additional driver software or hardwarechip to make them operational. However, Adafruit has developed a range of LED displays with accompanying driver chipsalongside software libraries for the Arduino.There are many different devices supported - 8x8 single and bi-colour matrix, 4-digit 7-segment, LED bar, etc. These devices usually comeas a partiallyassembled kit with only minor soldering required. The kit comprises the LED display, a single row header and a small PCB with a surface mountedHoltek HT16K33chip already fitted. The interface is I2C, which means only four connections are required: 0V, +5V, clock and data.Each device has three pairs of solder pads that can be connected to set the device's address - 3 bits allows 8 devices on the same I2C buswith address 0x70 to 0x77 inclusive. Leaving a pair unconnected gives a value of 0; connected, 1.
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