Hello all!
I am beginner with arduino and I am trying to put together sort of a weather station using two sensors and an OLED display.
I got it to work as I want except that the OLED is showing some gibberish in the very bottom, in addition to the useful information that I want. After tinkering with the code, it appears to me that, somehow, that gibberish is related to the sections of code not related to display.print. As I comment our some sections, the gibberish section gets shorter or longer, depending on how much I comment out.
I am using the libraries Adafruit_GFX.h and Adafruit_SSD1306.h.
Here is my code (pardon the mess, I am not good with it):
/*Humidity and Temperature Sketch
11.25.2019
*/
#include <Wire.h>
#include <math.h>
#include <Adafruit_BMP280.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include "DHT.h"
#define DHTPIN 2 // pin 2 as output
#define DHTTYPE DHT22 // sensor model
#define LEDPIN 3
// OLED display TWI address
#define OLED_ADDR 0x3C
Adafruit_SSD1306 display(-1);
#if (SSD1306_LCDHEIGHT != 64)
#error("Height incorrect, please fix Adafruit_SSD1306.h!");
#endif
Adafruit_BMP280 bmp; // I2C
//Define Variables
float phi; // variable for humidity
float temp; // variable for temperature
float temperaturec; // variable for temperature in C
float temperatureF;
float Temp; //
float TempR; // absolute temp in R
float Twb; // Wet Bulb Temp
float LogPws;
float Pws;
float Pw; // partial pressure of water vapor
float Ws; // Saturation Humidity Ratio
float mu; // Degree of saturation
float W; // Humidity Ratio
float P; // Pressure
float Td; // Dew Point
float H; // Enthalpy of Air
// Setup of sensor at the arduino cloeck speed
DHT dht(DHTPIN, DHTTYPE);
void setup() {
Wire.begin();
Serial.begin(9600);
Serial.println(F("BMP280 test"));
if (!bmp.begin()) {
Serial.println(F("Could not find a valid BMP280 sensor, check wiring!"));
while (1);
}
/* Default settings from datasheet. */
bmp.setSampling(Adafruit_BMP280::MODE_NORMAL, /* Operating Mode. */
Adafruit_BMP280::SAMPLING_X2, /* Temp. oversampling */
Adafruit_BMP280::SAMPLING_X16, /* Pressure oversampling */
Adafruit_BMP280::FILTER_X16, /* Filtering. */
Adafruit_BMP280::STANDBY_MS_500); /* Standby time. */
// Initialize DHT22 Sensor
dht.begin();
pinMode(LEDPIN, OUTPUT);
// initialize and clear display
display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR);
display.clearDisplay();
display.display();
}
void calculations(){
//Time for sensor to stabilize
delay(5000);
phi = dht.readHumidity(); // get humidity
temp = dht.readTemperature(true); // get temperature
temperaturec = bmp.readTemperature();
temperatureF = temperaturec*(9*0.2)+32;
Temp = (temp + temperatureF)/2; // average temp from 2 sensors
TempR = Temp+459.67;
P = bmp.readPressure()*0.000145037738;
if (Temp <= 32){
LogPws = ((-1.0214165*pow(10,4))/TempR)+(-4.8932428*pow(10,0))+(-5.3765794*pow(10,-3)*TempR)+(1.9202377*pow(10,-7)*pow(TempR,2))+(3.5575832*pow(10,-7)*pow(TempR,3))+(-9.0344688*pow(10,-14)*pow(TempR,4))+(4.1635019*pow(10,0)*log(TempR));
Pws = exp(LogPws);
}
else{
LogPws = ((-1.0440397*pow(10,4))/TempR)+(-1.1294650*pow(10,1))+(-2.7022355*pow(10,-2)*TempR)+(1.2890360*pow(10,-5)*pow(TempR,2))+(-2.4780681*pow(10,-9)*pow(TempR,3))+(6.5459673*log(TempR));
Pws = exp(LogPws);
}
// Partial Pressure Water Vapor
Pw = (phi/100)*Pws;
// Humidity Ratio
W = 0.621945*(Pw/(P-Pw));
// Wet Bulb Temperature
Twb = (temperaturec*atan(0.151977*pow((phi+8.313659),0.5))+atan(temperaturec+phi)-atan(phi-1.676331)+0.00391838*pow(phi,1.5)*atan(0.023101*phi)-4.686035)*1.8+32;
// Dew Point
if (Temp < 32){
Td = 90.12+26.142*log(Pw)+0.8927*pow(log(Pw),2);
}
else {
Td = 100.45+33.193*log(Pw)+2.319*pow(log(Pw),2)+0.17074*pow(log(Pw),3)+1.2063*pow(Pw,0.1984);
}
// Enthalpy
H = 0.240*Temp + W*(1061 + 0.444*Temp);
}
void displayData(){
/*
Serial.print("Humidity:");
Serial.print(phi);
Serial.print("\t");
Serial.print("Temperature:");
Serial.print(Temp);
Serial.print(" *F");
Serial.print("\t");
Serial.print(F("Wet Bulb Temp = "));
Serial.print(Twb,4);
Serial.print(" *F");
Serial.print("\t");
Serial.print(F("Dew Point = "));
Serial.print(Td,4);
Serial.print(" *F");
Serial.print("\t");
Serial.print(F("LNPws = "));
Serial.print(LogPws);
Serial.print("");
Serial.print("\t\t");
Serial.print(F("Pws = "));
Serial.print(Pws,4);
Serial.print(" psi");
Serial.print("\t\t");
Serial.print(F("Humidity Ratio = "));
Serial.print(W,4);
Serial.print(" lbsh2o/lbsda");
Serial.print("\t");
Serial.print(F("Enthalpy = "));
Serial.print(H,4);
Serial.print(" BTU/lbda");
Serial.print("\t");
Serial.print(F("Pressure = "));
Serial.print(bmp.readPressure());
Serial.print(" Pa");
Serial.print("\t\t");
Serial.print(F("Approx altitude = "));
Serial.print(bmp.readAltitude(1012.19)*3.28084); /* Adjusted to local forecast! */
// Serial.print(" ft");
//Serial.println();
//display.drawPixel(0, 0, WHITE);
//display.drawPixel(127, 0, WHITE);
//display.drawPixel(0, 63, WHITE);
//display.drawPixel(127, 63, WHITE);
//display data as text
display.setTextColor(WHITE);
display.setTextSize(2);
display.setCursor(30,1);
display.print("PSYCHO!");
display.setCursor(2, 18);
display.setTextSize(1);
display.setTextColor(WHITE);
display.print("Tdb:");
display.print(Temp);
display.print(" F db");
display.setCursor(2, 27);
display.setTextSize(1);
display.setTextColor(WHITE);
display.print("Twb:");
display.print(Twb);
display.print(" F wb");
display.setCursor(2, 36);
display.setTextSize(1);
display.setTextColor(WHITE);
display.print("RH:");
display.print(phi);
display.print("%");
display.setCursor(2, 45);
display.setTextSize(1);
display.setTextColor(WHITE);
display.print("Hum:");
display.print(W, 3);
display.print(" Lb/Lb");
display.setCursor(2, 54);
display.setTextSize(1);
display.setTextColor(WHITE);
display.print("DP:");
display.print(Td, 2);
display.print(" F");
}
void loop() {
// Repeat Calculations
calculations();
displayData();
// update display with all of the above graphics
display.display();
delay(5000);
display.clearDisplay();
/*
Conditions for visual cues - LED
if (temperatureF < 65) {
digitalWrite(LEDPIN, HIGH);
}
else {
digitalWrite(LEDPIN, LOW);
}
*/
}
And I am attaching a picture of what I mean by the gibberish.
Any ideas on how to get rid of it? Many thanks in advance!
