dinsdag 18 oktober 2016

Microduino Temperature and Humidity sensor and display

Microduino Temperature and Humidity sensor and display
Using Mixly (and a little tweak in Arduino IDE)




Mixly 'program':


Schermafbeelding 2016-10-18 om 17.27.15.png

In order to display only 1 decimal I tweaked the resulting Arduino sketch in the Arduino IDE:


#include <Wire.h>
#include <AM2321.h>
#include "U8glib.h"


float temp_reading;
float hum_reading;
char specialK;
String temp;
String hum;
float readByAM2321(int num) {
AM2321 am2321;
am2321.read();
float sensor_tem=am2321.temperature/10.0;
float sensor_hum=am2321.humidity/10.0;
delay(500);
if(num==1) {
return sensor_tem;
}
else if(num==2) {
return sensor_hum;
} else {
return 0.0;
}
}


U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NONE);
#define setFont_L u8g.setFont(u8g_font_fur20)
#define setFont_S u8g.setFont(u8g_font_fixed_v0r)
#define setFont_M u8g.setFont(u8g_font_9x18)


void setup()
{
 temp_reading = 0.0;
 hum_reading = 0.0;
 specialK = 176;
 temp = "";
 hum = "";
 Serial.begin(115200);
}


void loop()
{
 temp_reading = readByAM2321(1);
 hum_reading = readByAM2321(2);
 temp = String(temp_reading, 1);
 hum = String(hum_reading,1);
 temp = String(temp) + String(String(String(" ") + String(String("")+specialK)) + String("C"));
 hum = String(hum) + String(" %");


 int(0);


 u8g.undoRotation();
 u8g.firstPage();
 do {
   setFont_L;
   u8g.setPrintPos(20, 20);
   u8g.print(temp);
   setFont_L;
   u8g.setPrintPos(20, 60);
   u8g.print(hum);
 } while( u8g.nextPage() );


 Serial.println(temp_reading, 1);
 Serial.println(hum_reading, 1);
 delay(500);


}


The 'big' difference is the following:


 temp = String(temp_reading, 1);
 hum = String(hum_reading,1);


I used some LEGO Technics parts to put it all together:

IMG_20161018_172117.jpg

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