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| | [[image:Ks0064-图片1.png|thumb|600px|right|Keyestudio I2C 8x8 LED Matrix HT16K33]] |
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| [[image:Ks0064-图片1.png|thumb|600px|right|Keyestudio PIR Motion Sensor 3PCS]]
| | ==In |
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| ==Introduction== | |
| 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' - to control 64 LEDs you need 16 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. After all, wouldn't it be awesome if you could control a matrix without tons of wiring? That's where these lovely LED matrix backpacks come in. <br>
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| The matrices use the constant-current drivers for ultra-bright, consistent color, 1/16 step display dimming, all via a simple I2C interface. These 1.2" matrix backpacks come with three address-selection jumpers so you can connect up to eight 1.2" 8x8's together (or a combination, such as four 1.2" 8x8's and four 7-segments, etc) on a single I2C bus.
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| <br>[[Image:KS0336 (3)--.jpg|500px|frameless]]<br>
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| == Features ==
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| * 8 rows and 8 cols LED matrix
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| * Driven by HT16K33 chip
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| * Access to I2C communication pins
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| * Occupy less IO ports of microcontrollers
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| * Easy connection and available for more experiment extensions
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| == Parameters==
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| * Input voltage: 5V
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| * Rated input frequency: 400KHZ
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| * Input power: 2.5W
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| * Input current: 500mA
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| ==Pinout==
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| <br>[[Image:Pinouts.jpg|600px|frameless]]<br>
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| ==Wire it Up==
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| Connect the SCL pin to Analog A5, SDA pin to Analog A4 port; Connect VCC pin to 5V port, GND pin to GND.
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| <br>[[Image:KS0064.jpg|800px|frameless]]<br>
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| ==Sample Code==
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| Below is an example code, you can upload it to [http://wiki.keyestudio.com/index.php/Download_Arduino_IDE Arduino IDE].
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| *[http://wiki.keyestudio.com/index.php/Download_Arduino_IDE Download Arduino IDE ]
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| *[http://wiki.keyestudio.com/index.php/Install_Arduino_Driver Install Arduino Driver ]
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| *[http://wiki.keyestudio.com/index.php/Install_Arduino_Library Install Arduino Library ]
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| <pre>
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| #include <Wire.h>
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| #include "Adafruit_LEDBackpack.h"
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| #include "Adafruit_GFX.h"
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| #ifndef _BV
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| #define _BV(bit) (1<<(bit))
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| #endif
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| Adafruit_LEDBackpack matrix = Adafruit_LEDBackpack();
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| uint8_t counter = 0;
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| void setup() {
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| Serial.begin(9600);
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| Serial.println("HT16K33 test");
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| matrix.begin(0x70); // pass in the address
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| }
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| void loop() {
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| // paint one LED per row. The HT16K33 internal memory looks like
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| // a 8x16 bit matrix (8 rows, 16 columns)
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| for (uint8_t i=0; i<8; i++) {
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| // draw a diagonal row of pixels
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| matrix.displaybuffer[i] = _BV((counter+i) % 16) | _BV((counter+i+8) % 16) ;
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| }
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| // write the changes we just made to the display
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| matrix.writeDisplay();
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| delay(100);
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| counter++;
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| if (counter >= 16) counter = 0;
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| }
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| </pre>
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| '''Note:''' before upload the code, you should place the library inside Arduino libraries. Or else fail to compile it.
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| You can download the code libraries from the link below: <br>
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| https://drive.google.com/open?id=1FUTIwsfGdxTXXgYDGxI7U2VoP0g3G-2L
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| ==Example Result==
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| Done wiring and powered up, upload well the code to UNO board, you will see the dot matrix display the image shown below.
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| <br>[[Image:KS0336-2.jpg|800px|frameless]]<br>
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| == Resources ==
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| * [https://drive.google.com/open?id=1GsUozAQmrYJjslil1czGAUK1an1oUNE7_ You can click here to download the datasheet]
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| * [https://drive.google.com/open?id=1FUTIwsfGdxTXXgYDGxI7U2VoP0g3G-2L Click here to download the code libraries]
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| * '''Video：''' http://www.keyestudio.com/wp/ks0064/
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| == Buy From ==
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| * '''Official Website:''' http://www.keyestudio.com/ks0064.html
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| * [https://www.ebay.com/itm/132594433342 '''From eBay''']
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| * [https://www.aliexpress.com/store/product/Keyestudio-Red-color-common-cathode-I2C-8-8-LED-dot-Matrix-module-HT16K33-for-arduino/1452162_32617887351.html?spm=2114.12010612.8148356.19.2ad52933y2jfa6 '''From Aliexpress''']
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| [[category:Module]]
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