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Heart-shaped LED Chaser PCB Board

Using Printed Circuit Board (PCB) can give you a neat and stable electronic circuit assembly.

A month ago I used PCB technology to make a heart-shaped LED Chaser board.







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DIY Electronic Alarm

This is my DIY Electronic Alarm, now the prototype has been finished with breadboard, but the PCB layout has not been finished yet. I use a MCU(Arduino Uno) and four 74LS47 7-segment-display drivers to control the four 7-segment-displays to show the digits of Minutes and Seconds. When the alarm is triggered, the buzzer will generate sound.
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Moving custom-made pixel patterns in LCD

Do you want to know how to move custom-made pixel patterns in LCD ? Here it is : #include <LiquidCrystal.h> LiquidCrystal lcd(12, 11, 5, 4, 3, 2); int movL,movR; int i=0; byte pixels[8] = {  B11111,   B10001,   B11011,   B10001,   B11111,   B01010,   B01010,   B01010 }; void setup() {   pinMode(14,INPUT_PULLUP);   pinMode(15,INPUT_PULLUP);   lcd.createChar(0, pixels);   lcd.begin(16, 2);   lcd.write(byte(0)); } void loop() {     movL=digitalRead(14);     movR=digitalRead(15);     if(movL==0)     {      i++;     lcd.clear();     lcd.setCursor(i,0);     lcd.write(byte(0));     delay(200);     }     if(movR==0)     {      i--;     lcd.clear();     lcd.setCursor(i,0);     lcd.write(byte(0));    ...
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