Ukur Jarak SR04 P10 DMD Arduinio Nano
Sensor Ultrasonic SR04, Arduino Nano,P10 DMD,
2 Modul P10 (64 x 32), 5 VDC 2A
Videonya
SKetch Arduino
#include <SPI.h>
#include <DMD.h>
#include <TimerOne.h>
#include <Arial14.h>
//#include "fixednums8x16.h"
#include "SystemFont5x7.h"
#include "Arial_black_16.h"
const int triggerPin = 2; // was pin 12 defore the DMD
const int echoPin = 3; // was pin13 before the DMD
#define DISPLAYS_ACROSS 2 // i whant to display it on 16x64 pixels
#define DISPLAYS_DOWN 1
DMD dmd(DISPLAYS_ACROSS, DISPLAYS_DOWN);
void ScanDMD() {
dmd.scanDisplayBySPI();
}
//long microsecondsToInches(long microseconds) {
// return microseconds / 74 / 2;
//}
long microsecondsToCentimeters(long microseconds) {
// *** THIS NEEDS TO BE CHECKED FOR THE HC-SR04 ***
return microseconds / 29 / 2;
}
void setup() {
// initialize serial communication for the terminal windows.
Serial.begin(9600);
// setup DMD refreshing
Timer1.initialize( 500 );
Timer1.attachInterrupt( ScanDMD );
// initialise DMD as blank, all LEDs off
dmd.clearScreen( true );
// choose a font to use
dmd.selectFont (Arial_black_16);
// set up pins for ultrasonic sensor
pinMode(triggerPin, OUTPUT);
pinMode(echoPin, INPUT);
}
void loop() {
// establish variables for duration of the ping,
// and the distance result in inches and centimeters:
long duration, inches, cm;
// The device is triggered by a HIGH pulse of 2 or more microseconds.
// Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
digitalWrite(triggerPin, LOW);
delayMicroseconds(2);
digitalWrite(triggerPin, HIGH);
delayMicroseconds(5);
digitalWrite(triggerPin, LOW);
// The echo pin is used to read the signal from the device: a HIGH
// pulse whose duration is the time (in microseconds) from the sending
// of the ping to the reception of its echo off of an object.
duration = pulseIn(echoPin, HIGH);
// convert the time into a distance
// inches = microsecondsToInches(duration);
cm = microsecondsToCentimeters(duration);
// Serial.print(inches);
// Serial.print(" in, ");
// Serial.print(cm);
// Serial.print(" cm");
// Serial.println();
dmd.clearScreen( true );
String output(inches);
//output += " in, ";
output += cm;
output += " cm";
char buf[64];//[32];
output.toCharArray(buf, 64);
dmd.drawString (0,0, buf, strlen(buf), GRAPHICS_NORMAL );
Serial.println(output);
delay(700); // 1000 if on will cause an 1 hz blinking value dispalyed
}
