mousa

This is simple distance meter with 6LEDs. you can replace the last red led with a buzzer. distance range: <5 to 30cm ultrasonic module: HC-SR04 NOTE: Ultrasonic module can detect distance range from 2cm to 450cm but in this project i set the distance range from <5 to 30cm. code: #define trigPin 7 #define echoPin 6 #define led 13 #define led2 12 #define led3 11 #define led4 10 #define led5 9 #define led6 8 int sound = 250; void setup() {   Serial.begin (9600);   pinMode(trigPin, OUTPUT);   pinMode(echoPin, INPUT);   pinMode(led, OUTPUT);   pinMode(led2, OUTPUT);   pinMode(led3, OUTPUT);   pinMode(led4, OUTPUT);   pinMode(led5, OUTPUT);   pinMode(led6, OUTPUT);   } void loop() {   long duration, distance;   digitalWrite(trigPin, LOW);   delayMicroseconds(2);   digitalWrite(trigPin, HIGH);   delayMicroseconds(10);   digitalWrite(trigPin, LOW);   duration = pulseIn(echoPin, HIGH);   distance = (duration/2) / 29.1;   if (distance <= 30) {     digitalWrite(led, HIGH);     sound = 25

There are many ways to water and energy saving that help to reducing water and electric bill and also help to environment. 29 tips briefly: 1-Using LED lamps rather than CFL or incandescent lamps. 2-Using auto light switch for garden lights. that turn on your garden lamps at night and turn off that in daylight automatically. 3- Using motion sensor switch help to optimizing electric consumption. 4-Solar energy can product all or some power needed in your home 5-Using solar water heater   6-Double glazed windows work as a heat insulator so doesn't allow to heat go outside in winner and doesn't allow to heat come inside in summer. 7-Don't run air conditioner and ceiling fan together because the ceiling fan push the heat air down.   8- Always set your conditioner in auto state then choose suitable temp. that you want. in this state the conditioner stops when arrive to that temp. so help to power saving.  9-New fridge always have an incandescent lamp that consume high power and