davidr2003
22.12.2020, 18:19

Wie kann ich diese delays mit millis ersetzen?

Hallo, ich versuche mir gerade die millis Funktion beizubringen. Zurzeit verstehe ich wie man Blink without delay an der internen LED programmiert, aber ich blicke nicht ganz durch, wie ich mein ganzes Programm mit millis ersetze. Ich möchte nämlich, dass sich zwei Motoren abhängig von den Messwerten eines Ultraschallsensors drehen. Wenn die Distanz >=5 ist, sollen sie sich beide vorwärts drehen ansonsten für 3 Sekunden rückwärts (Im Code sieht es nur so komisch aus mit FORWARD und BACKWARD, weil ich die Anschlüsse bei einem Motor falsch angelötet habe). Ich würde mich sehr über eine Antwort freuen :)

#include <AFMotor.h>
#include <Servo.h>


//AF_DCMotor motor1(1);
//AF_DCMotor motor2(2);
AF_DCMotor motor3(3);
AF_DCMotor motor4(4);


int trigPin = 9;
int echoPin = 10;


unsigned long currentmillis;
unsigned long previousmillis;
const long interval_1 = 1000;
const long interval_2 = 10;


void setup() {
  Serial.begin(9600); 
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);


//  motor1.setSpeed(250);
//  motor1.run(RELEASE);
//  motor2.setSpeed(250);
//  motor2.run(RELEASE);
  motor3.setSpeed(250);
  motor3.run(RELEASE);
  motor4.setSpeed(250);
  motor4.run(RELEASE);


}


void loop() {
  //Ultraschallsensor
  currentmillis = millis();
  long duration, distance;


  if (currentmillis - previousmillis >= interval_1){
  digitalWrite(trigPin,HIGH);
  //delay(1000);
     previousmillis = currentmillis;
  }
  if (currentmillis - previousmillis >= interval_2){
  digitalWrite(trigPin, LOW);
  duration=pulseIn(echoPin, HIGH);
  distance =(duration/2)/29.1;
  Serial.print(distance);
  Serial.println("CM");
  //delay (10);
     previousmillis = currentmillis;
  }


//Motoren


//vorwärts
if (distance >=5){
  motor3.run(FORWARD);
  motor4.run(BACKWARD);
}
//rückwärts
if (currentmillis - previousmillis <= interval_1){
  if (distance <=5) {
  motor3.run(BACKWARD);
  motor4.run(FORWARD);
  //delay(3000);
    previousmillis = currentmillis;
  }
}
Arduino, Arduino Uno
1 Antwort
davidr2003
22.06.2020, 20:16
Mit Links

Warum gibt mir DHT Sensor im seriellen Monitor immer 0°C und 0% Luftfeuchtigkeit an?

Die Verdrahtung stimmt ganz sicher aber ich habe schon mehrere Programme probiert und der Sensor wird zwar erkannt, gibt aber immer nur 0 aus.

// Example testing sketch for various DHT humidity/temperature sensors
// Written by ladyada, public domain


// REQUIRES the following Arduino libraries:
// - DHT Sensor Library: https://github.com/adafruit/DHT-sensor-library
// - Adafruit Unified Sensor Lib: https://github.com/adafruit/Adafruit_Sensor


#include "DHT.h"


#define DHTPIN 9    // Digital pin connected to the DHT sensor
// Feather HUZZAH ESP8266 note: use pins 3, 4, 5, 12, 13 or 14 --
// Pin 15 can work but DHT must be disconnected during program upload.


// Uncomment whatever type you're using!
//#define DHTTYPE DHT11   // DHT 11
#define DHTTYPE DHT11   // DHT 22  (AM2302), AM2321
//#define DHTTYPE DHT21   // DHT 21 (AM2301)


// Connect pin 1 (on the left) of the sensor to +5V
// NOTE: If using a board with 3.3V logic like an Arduino Due connect pin 1
// to 3.3V instead of 5V!
// Connect pin 2 of the sensor to whatever your DHTPIN is
// Connect pin 4 (on the right) of the sensor to GROUND
// Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor


// Initialize DHT sensor.
// Note that older versions of this library took an optional third parameter to
// tweak the timings for faster processors.  This parameter is no longer needed
// as the current DHT reading algorithm adjusts itself to work on faster procs.
DHT dht(DHTPIN, DHTTYPE);


void setup() {
  Serial.begin(9600);
  Serial.println(F("DHTxx test!"));


  dht.begin();
}


void loop() {
  // Wait a few seconds between measurements.
  delay(2000);


  // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  float h = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float t = dht.readTemperature();
  // Read temperature as Fahrenheit (isFahrenheit = true)
  float f = dht.readTemperature(true);


  // Check if any reads failed and exit early (to try again).
  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }


  // Compute heat index in Fahrenheit (the default)
  float hif = dht.computeHeatIndex(f, h);
  // Compute heat index in Celsius (isFahreheit = false)
  float hic = dht.computeHeatIndex(t, h, false);


  Serial.print(F("Humidity: "));
  Serial.print(h);
  Serial.print(F("%  Temperature: "));
  Serial.print(t);
  Serial.print(F("°C "));
  Serial.print(f);
  Serial.print(F("°F  Heat index: "));
  Serial.print(hic);
  Serial.print(F("°C "));
  Serial.print(hif);
  Serial.println(F("°F"));
}
programmieren, Arduino Uno, Arduino Nano
1 Antwort
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