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Traffic light using 4017 and 555 Parts List: IC555 IC4017 Transistor 2N2222 or any other NPN(3pcs) Red 3mm LED(35pcs) Yellow 3mm LED(35pcs) Green 3mm LED(35pcs) Potentiometer 1M Resistor 100K Resistor 200R 1W Resistor 1K(3pcs) Capacitor 10uF 16v Diode 1N4007 or 1N4148 (9pcs) Circuit: Note:  Use 3mm LEDs only Gerber File: https://drive.google.com/open?id=148pt9TWYS_L4lGvcN-ootc40P0dDy-2m Video:

This circuit is an LED Chaser with 81 LEDs using two 4017 ICs and 555 timer The circuit explained in this video here: https://www.youtube.com/watch?v=JoBsPduHEyc PCBWay is the sponsor of this project Website:  www.pcbway.com You can download the Gerber file or reorder this PCB here Circuit diagram: Parts list: IC 4017(2pcs) IC 555 5mm LEDs (81 pcs) 1K resistor(9pcs) 10K resitor 3.3K resistor 470R resistor 2N2222 transistor(9pcs) 1uF capacitor 100K potentiometer 1N4007 diode Video:

LED Chaser/Sequencer using IC 4017 & IC 555 Parts list: IC 4017 IC 555 LEDs (22pcs) Diode 1N4007 (10pcs) Potentiometer 100K Resistor 330 ohm Capacitor 2.2uF 16V I connect two LEDs in parallel to each output. The Diode through positive supply (VCC) used only for reverse polarity protection(not necessary).

81 LED Matrix X-Y controlled with two Clock pulses (different frequency) using 4017 IC Parts list: 4017(2pcs) LED (81 pcs) Resistor 330R (9pcs) Resistor 10K (9pcs) Transistor 2N3904 (9pcs) Circuit: Video: 

Calculation of capacitor value for PFC using Arduino By this Arduino project you can find out the capacitor value needed for PFC (Power Factor Correction) using arduino without any mathematical process.   Following image show you the value given by arduino and the value given by the PFC app. that available for Android in google play for free. both give me the same value. Then i connect a capacitor with value given by arduino and the PF become unity When no load connected When the load is resistive Parts list: Arduino board Energy meter module Pzem-004t   LCD 16x2 with I2C adapter board Connecting wires Wiring: Video: Code: #include "math.h" #include <Wire.h> #include <LiquidCrystal_I2C.h> #include <SoftwareSerial.h> // Arduino IDE <1.6.6 #include <PZEM004T.h> LiquidCrystal_I2C lcd(0x27,16,2); PZEM004T pzem(2,3);  // (RX,TX) connect to TX,RX of PZEM IPAddress ip(192,168,1,1); void setup() {   Serial.begin(9600);   pzem.setAddress(ip); ...

Design and make a big LED 7-Segment for Arduino using BCD to 7segment IC 4511 Parts list: IC4511 LED (35pcs) Resisror 120R (7pcs) Male header pin (6 pin+3 pin) Connecting wires Gerber file: https://drive.google.com/open?id=11R5_IPifnDhEPtdtgeX3StvApPpHDora Circuit: IMPORTANT NOTE: IC 4511 has sourcing current=25mA for each segment, I used five parallel Green LEDs for each segment,i test the total current drawing is only 20mA(4mA each LED), but if you want to use another LED color which make the total current drawing more than 25mA for each segment so you have to add switching transistor for each segment. I chooses Green color LED because draw very very low current and make the circuit simple as possible(No switching transistor needed). Video:  Code:  void setup(){   pinMode(2, OUTPUT); //A   pinMode(3, OUTPUT); //B   pinMode(4, OUTPUT); //C   pinMode(5, OUTPUT); //D } void loop(){     //Number Zero   digitalWrite(2, LOW);   digitalWrite(...

Arduino spirit Level using gyroscope with 11-LED Parts list: Arduino Nano: https://goo.gl/Gox61E Gyroscope: https://goo.gl/vxP6zG Prototype Breadboard: https://goo.gl/jxEJx5 LED Kit: https://goo.gl/UDemfT Resistor Kit: https://goo.gl/TvFJWz Circuit: Video: Code: #include <Wire.h> //Declaring some global variables int gyro_x, gyro_y, gyro_z; long gyro_x_cal, gyro_y_cal, gyro_z_cal; boolean set_gyro_angles; long acc_x, acc_y, acc_z, acc_total_vector; float angle_roll_acc, angle_pitch_acc; float angle_pitch, angle_roll; int angle_pitch_buffer, angle_roll_buffer; float angle_pitch_output, angle_roll_output; long loop_timer; int temp; void setup() {   pinMode(3,OUTPUT);   pinMode(4,OUTPUT);   pinMode(5,OUTPUT);   pinMode(6,OUTPUT);   pinMode(7,OUTPUT);   pinMode(8,OUTPUT);   pinMode(9,OUTPUT);   pinMode(10,OUTPUT);   pinMode(11,OUTPUT);   pinMode(12,OUTPUT);   pinMode(13,OUTPUT);   Wire.begin();     ...