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Topic: Project sensor SRF05 and 5 leds (Read 1 time) previous topic - next topic


Hello, my name is Hugo, im 16 years old and i work on a project. I have to found an arduino code which can switch on the sensor SRF 05. I would like too that when the SRF 05 detect an objet, 5 led switched on ! Sorry if my english is too bad ! Thank you very much, see you soon

Runaway Pancake

I have to found an arduino code which can switch on the sensor SRF 05.


"Who is like unto the beast? who is able to make war with him?"
When all else fails, check your wiring!



I have this code for one led but i am not sure for five led

// written at: luckylarry.co.uk
// variables to take x number of readings and then average them
// to remove the jitter/noise from the SRF05 sonar readings

const int numOfReadings = 10;                   // number of readings to take/ items in the array
int readings[numOfReadings];                    // stores the distance readings in an array
int arrayIndex = 0;                             // arrayIndex of the current item in the array
int total = 0;                                  // stores the cumlative total
int averageDistance = 0;                        // stores the average value

// setup pins and variables for SRF05 sonar device

int echoPin = 2;                                // SRF05 echo pin (digital 2)
int initPin = 3;                                // SRF05 trigger pin (digital 3)
unsigned long pulseTime = 0;                    // stores the pulse in Micro Seconds
unsigned long distance = 0;                     // variable for storing the distance (cm)

// setup pins/values for LED

int redLEDPin = 9;                              // Red LED, connected to digital PWM pin 9
int redLEDValue = 0;                            // stores the value of brightness for the LED (0 = fully off, 255 = fully on)


void setup() {

  pinMode(redLEDPin, OUTPUT);                   // sets pin 9 as output
  pinMode(initPin, OUTPUT);                     // set init pin 3 as output
  pinMode(echoPin, INPUT);                      // set echo pin 2 as input

  // create array loop to iterate over every item in the array

  for (int thisReading = 0; thisReading < numOfReadings; thisReading++) {
readings[thisReading] = 0;
// initialize the serial port, lets you view the
// distances being pinged if connected to computer

// execute
void loop() {
digitalWrite(initPin, HIGH);                    // send 10 microsecond pulse
delayMicroseconds(10);                  // wait 10 microseconds before turning off
digitalWrite(initPin, LOW);                     // stop sending the pulse
pulseTime = pulseIn(echoPin, HIGH);             // Look for a return pulse, it should be high as the pulse goes low-high-low
distance = pulseTime/58;                        // Distance = pulse time / 58 to convert to cm.
total= total - readings[arrayIndex];           // subtract the last distance
readings[arrayIndex] = distance;                // add distance reading to array
total= total + readings[arrayIndex];            // add the reading to the total
arrayIndex = arrayIndex + 1;                    // go to the next item in the array
// At the end of the array (10 items) then start again
if (arrayIndex >= numOfReadings)  {
    arrayIndex = 0;

  averageDistance = total / numOfReadings;      // calculate the average distance

  // if the distance is less than 255cm then change the brightness of the LED

  if (averageDistance < 255) {
    redLEDValue = 255 - averageDistance;        // this means the smaller the distance the brighterthe LED.

  analogWrite(redLEDPin, redLEDValue);          // Write current value to LED pins
  Serial.println(averageDistance, DEC);         // print out the average distance to the debugger
  delay(100);                                   // wait 100 milli seconds before looping again


Someone knows how to put 4 other led un this code ?

Runaway Pancake

Well, in the sketch that you posted, there is a variable called "Distance".
Once "Distance" has been acquired then you can make a determination as to which LED/s to turn on.
Look into if and if...else
"Who is like unto the beast? who is able to make war with him?"
When all else fails, check your wiring!

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