Other Arduino Codes and Videos by Robojax
/*
* Original code from TM1637 https://github.com/avishorp/TM1637
* Original code and library for DHT22 https://github.com/adafruit/DHT-sensor-library
* Watch the video for this code https://youtu.be/xD8wHXDzLkQ
* Other Arduino libarary and videos http://robojax.com/learn/arduino/
*/
/*
* Modified for Robojax video on Jan 10, 2018
* by Ahmad Nejrabi, in Ajax, Ontario, Canada
*/
// ****** Start of TM1637 Display code
#include <Arduino.h>
#include <TM1637Display.h>
// Module connection pins (Digital Pins)
#define CLK 2
#define DIO 3
// The amount of time (in milliseconds) between tests
#define TEST_DELAY 1000
TM1637Display display(CLK, DIO);
// ****** end of TM1637 Display code
// Example testing sketch for various DHT humidity/temperature sensors
// Written by ladyada, public domain
// updated by Ahmad Nejrabi for Robojax.com videos.
// on Jan 10, 2018 in Ajax, Ontario, Canada
// ****** Start of DHT code
#include "DHT.h"
#define DHTPIN 9 // what digital pin we're connected to
// Uncomment whatever type you're using!
//#define DHTTYPE DHT11 // DHT 11
#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321
//#define DHTTYPE DHT21 // DHT 21 (AM2301)
DHT dht(DHTPIN, DHTTYPE);
// ********** end of DHT22 code
#define RELAY 7 // the pin connected to relay
void setup()
{
Serial.begin(9600);
Serial.println("DHT22 Robojax Test with Display");
pinMode(RELAY,OUTPUT);// set RELAY pin as output
dht.begin();
}
void loop()
{
delay(TEST_DELAY);// wait
// **** TM1637 code start
display.setBrightness(0x0f);// set brightness
uint8_t data[] = { 0x0, 0x0, 0x0, 0x0 };// clear display values
display.setSegments(data);//clear display
// **** TM1637 code end
// Robojax.com test video
Serial.println(getTemp("c"));
int temp = round(getTemp("c"));
display.showNumberDec(temp, false, 3,1);
if(temp >50 )
{
digitalWrite(RELAY, LOW);
}else{
digitalWrite(RELAY, HIGH);
}
}// loop end
/*
* getTemp(String req)
* returns the temprature related parameters
* req is string request
* getTemp("c") will return temprature in Celsius
* getTemp("hic") will return heat index in Celsius
* getTemp("f") will return temprature in Fahrenheit
* getTemp("hif") will return temprature in Fahrenheit
* getTemp("h") will return humidity
*/
float getTemp(String req)
{
// 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);
// 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);
// Check if any reads failed and exit early (to try again).
if (isnan(h) || isnan(t) || isnan(f)) {
Serial.println("Failed to read from DHT sensor!");
return;
}
// Compute heat index in Kelvin
float k = t + 273.15;
if(req =="c"){
return t;//return Cilsus
}else if(req =="f"){
return f;// return Fahrenheit
}else if(req =="h"){
return h;// return humidity
}else if(req =="hif"){
return hif;// return heat index in Fahrenheit
}else if(req =="hic"){
return hic;// return heat index in Cilsus
}else if(req =="k"){
return k;// return temprature in Kelvin
}else{
return 0.000;// if no reqest found, retun 0.000
}
}
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