I got a new problem now with the TFT_HX8357.h
Screen is flashing / refreshing with the delay time..
Any hints to fix it?
The code i use:
#include <DHT.h>
#include <TFT_HX8357.h> // Hardware-specific library
#include "Free_Fonts.h" // Include the header file attached to this sketch
#define DHTPIN 13 //pin for DHT22
#define DHTTYPE DHT22 // DHT 22 (AM2302)
#define SensorPin A9
#define Offset 0.40 //deviation compensate
#define samplingInterval 20
#define printInterval 800
#define ArrayLenth 40 //times of collection
int pArray[ArrayLenth];
int pArrayIndex=0;
DHT dht(DHTPIN, DHTTYPE);
TFT_HX8357 tft = TFT_HX8357(); // Invoke custom library
unsigned long drawTime = 0;
void setup()
{
Serial.begin(9600);
tft.begin();
tft.setRotation(1);
dht.begin();
analogReference(INTERNAL1V1);
}
void loop() {
pLoop();
dthLoop();
displayLoop();
}
void displayLoop()
{
int xpos = 0;
int ypos = 40;
tft.setTextColor(TFT_WHITE, TFT_BLACK);
tft.setFreeFont(FSB18);
tft.fillScreen(TFT_BLACK);
tft.drawString("VEDEN LAMPOTILA", 1, 90, GFXFF);
tft.drawString("ILMAN LAMPOTILA", 1, 150, GFXFF);
tft.drawString("C", 420, 150, GFXFF);
tft.drawString("ILMAN KOSTEUS", 1, 230, GFXFF);
tft.drawString("%", 420, 230, GFXFF);
tft.drawString(" ARVO", 1, 10, GFXFF);
}
void dthLoop()
{
float h = dht.readHumidity();
float t = dht.readTemperature();
tft.setFreeFont(FSB18);
tft.drawFloat(t, 1, 370, 150, GFXFF);
tft.drawFloat(h, 1, 370, 230, GFXFF);
delay (5000);
}
void phLoop ()
{
static unsigned long samplingTime = millis();
static unsigned long printTime = millis();
static float pHValue,voltage;
if(millis()-samplingTime > samplingInterval)
{
pArray[pHArrayIndex++]=analogRead(SensorPin);
if(pArrayIndex==ArrayLenth)pHArrayIndex=0;
voltage = avergearray(pHArray, ArrayLenth)*5.0/1024;
pValue = 3.50*voltage+Offset;
samplingTime=millis();
}
if(millis() - printTime > printInterval) //Every 800 milliseconds, print a numerical, convert the state of the LED indicator
{
Serial.print("Voltage:");
Serial.print(voltage,2);
Serial.print(" pH value: ");
Serial.println(pValue,2);
}
{
tft.setFreeFont(FSB18);
tft.drawFloat(pValue, 1, 300, 10, GFXFF);
printTime=millis();
}
}
double avergearray(int* arr, int number){
int i;
int max,min;
double avg;
long amount=0;
if(number<=0){
Serial.println("Error number for the array to avraging!/n");
return 0;
}
if(number<5){ //less than 5, calculated directly statistics
for(i=0;i<number;i++){
amount+=arr[i];
}
avg = amount/number;
return avg;
}else{
if(arr[0]<arr[1]){
min = arr[0];max=arr[1];
}
else{
min=arr[1];max=arr[0];
}
for(i=2;i<number;i++){
if(arr[i]<min){
amount+=min; //arr<min
min=arr[i];
}else {
if(arr[i]>max){
amount+=max; //arr>max
max=arr[i];
}else{
amount+=arr[i]; //min<=arr<=max
}
}//if
}//for
avg = (double)amount/(number-2);
}//if
return avg;
}
}