Lesson 27--Microduino 8*8 Lattice Static Display

Language	English

Objective The tutorial will teach you use two 74HC595 to control 8** lattice and display a static smiling faces. Equipment Microduino-Core Microduino-FT232R Other hardware equipment Breadboard Jumper one box Breadboard one piece 8*8 lattice one 74HC595 Two USB cable one 8*8 lattice LED introduction： 8*8 lattice LED is made of 64 light-emitting diodes, differenet type has different definition of the pin. This example uses the LD-1088BS 8*8 lattice LED, the pins are defined as follows: Schematice Pin Table： Lattice ROW Lattice 16pin 74HC595 74HC595 1 13 15 Q0 2 3 1 Q1 3 4 2 Q2 4 10 3 Q3 5 6 4 Q4 6 11 5 Q5 7 15 6 Q6 8 16 7 Q7 Lattice COL Lattice 16pin 74HC595 74HC595 1 5 15 Q0 2 2 1 Q1 3 7 2 Q2 4 1 3 Q3 5 12 4 Q4 6 8 5 Q5 7 14 6 Q6 8 9 7 Q7 Program //Pin connects to 74HC595的ST_CP int latchPin = 8; //Pin connects to 74HC595的SH_CP int clockPin = 12; ////Pin connects to 74HC595的DS int dataPin = 11; void setup() { //Set barud roate 9600 Serial.begin(9600); //Set the latchpin as output pinMode(latchPin, OUTPUT); } void loop() { //Smile for 8x8 Matrix LED digitalWrite(latchPin, 0); shiftOut(dataPin, clockPin, B01111111); //col shiftOut(dataPin, clockPin, B00111100); //row digitalWrite(latchPin, 1); digitalWrite(latchPin, 0); shiftOut(dataPin, clockPin, B10111111); //col shiftOut(dataPin, clockPin, B01000010); //row digitalWrite(latchPin, 1); digitalWrite(latchPin, 0); shiftOut(dataPin, clockPin, B11011111); //col shiftOut(dataPin, clockPin, B10100101); //row digitalWrite(latchPin, 1); digitalWrite(latchPin, 0); shiftOut(dataPin, clockPin, B11101111); //col shiftOut(dataPin, clockPin, B10000001); //row digitalWrite(latchPin, 1); digitalWrite(latchPin, 0); shiftOut(dataPin, clockPin, B11110111); //col shiftOut(dataPin, clockPin, B10100101); //row digitalWrite(latchPin, 1); digitalWrite(latchPin, 0); shiftOut(dataPin, clockPin, B11111011); //col shiftOut(dataPin, clockPin, B10011001); //row digitalWrite(latchPin, 1); digitalWrite(latchPin, 0); shiftOut(dataPin, clockPin, B11111101); //col) shiftOut(dataPin, clockPin, B01000010); //row digitalWrite(latchPin, 1); digitalWrite(latchPin, 0); shiftOut(dataPin, clockPin, B11111110); //col shiftOut(dataPin, clockPin, B00111100); //row digitalWrite(latchPin, 1); } void shiftOut(int myDataPin, int myClockPin, byte myDataOut) { //initialization int i=0; int pinState; pinMode(myClockPin, OUTPUT); pinMode(myDataPin, OUTPUT); //clear everything out just in case to //prepare shift register for bit shifting digitalWrite(myDataPin, 0); digitalWrite(myClockPin, 0); //for each bit in the byte myDataOut&#239;&#191;&#189; //NOTICE THAT WE ARE COUNTING DOWN in our for loop //This means that %00000001 or "1" will go through such //that it will be pin Q0 that lights. for (i=7; i>=0; i--) { digitalWrite(myClockPin, 0); //if the value passed to myDataOut and a bitmask result // true then... so if we are at i=6 and our value is // %11010100 it would the code compares it to %01000000 // and proceeds to set pinState to 1. if ( myDataOut & (1<<i) ) { pinState= 1; } else { pinState= 0; } //Sets the pin to HIGH or LOW depending on pinState digitalWrite(myDataPin, pinState); //register shifts bits on upstroke of clock pin digitalWrite(myClockPin, 1); //zero the data pin after shift to prevent bleed through digitalWrite(myDataPin, 0); } //stop shifting digitalWrite(myClockPin, 0); } Debug Step 1：Copy the code to IDE and compile it Step 2：Set up circuit, as follows: In order to protect the circuit, plus a 220Ω registor on the every connection line (total 8 lines) between one 74HC595 chip and 8*8 latteice LED. In our example, we don't use the registor, so the LED's brightnees is strong. If the lattice's quality is bad and easily broken. Step 3：Run program Result 8*8 lattice LED will diaplya a smiling face. Video