Hey, I am very new to Arduino and programming, I'm making a so-called pocket weather station that transmits the data wirelessly to Thingspeak via ESP8266 Module on an Uno board, the code for the data to transmit to the Thingspeak is only working if the Arduin are connected to my computer, is there any other way to make it truly wireless? because i am very amateur and just kit bashing the program code from various sources. Thanks in advance!
here is my code :
#include <stdlib.h>
#include <SoftwareSerial.h>
#include <SPI.h> //include Serial Peripheral Interface library
#include <Wire.h> //include Two Wire Interface library
#include <Adafruit_GFX.h> // include Adafruit graphics library
#include <Adafruit_ST7735.h> // include Adafruit ST7735 TFT library
#include <Adafruit_BMP280.h> // include Adafruit BMP280 sensor library
#include "DHT.h" //include DHTXX sensor library
#define DHTPIN 4 //DHT11 data pin connected to arduino pin D2
#define DHTTYPE DHT11 //specifying the type of DHT sensor used
#define TFT_RST 8 // TFT RST pin is connected to arduino pin D8
#define TFT_CS 10 // TFT CS pin is connected to arduino pin D9
#define TFT_DC 9 // TFT DC pin is connected to arduino pin D10
#define SSID "------";
#define PASS "---------";
#define IP "184.106.153.149" // thingspeak.com IP
SoftwareSerial monitor(2, 3); //Serial communication to ESP8266 module (RX, TX)
String GET = "GET /update?key=&field1="; //replace ZZZZZ by your ThingSpeak channel write key
// initialize ST7735 SERIES TFT library
Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST);
// define device I2C address: 0x76 or 0x77 (0x77 is the library default address)
#define BMP280_I2C_ADDRESS 0x76
Adafruit_BMP280 bmp280; // initialize Adafruit BMP280 library
DHT dht(DHTPIN, DHTTYPE); // initialize DHT sensor
unsigned long starttime;
unsigned long sampletime_ms = 10000;
unsigned long delay_time = 60000;
void setup(void)
{
//start serial communications
Serial.begin(9600);
monitor.begin(9600);
Serial.println("Initializing...");
//communication with wifi module
monitor.flush();
monitor.println("AT");
delay(2000);
if (monitor.find("OK")) {
Serial.println("Communication with ESP8266 module: OK");
}
else {
Serial.println("ESP8266 module ERROR");
}
//connect wifi router
Serial.print("Sampling (");
Serial.print(sampletime_ms / 1000);
Serial.println("s)...");
//initialize timer
starttime = millis();
dht.begin(); // synchronizing DHT sensor
tft.initR(INITR_BLACKTAB); // initialize a ST7735S chip, black tab
tft.fillScreen(ST77XX_BLACK); // setting black background
tft.drawFastHLine(0, 15 , tft.width(), ST77XX_CYAN);// draw horizontal seperation line at position (0, 15)
tft.setTextColor(ST77XX_CYAN, ST77XX_BLACK); // set text color to white and black background
tft.setTextSize(1.5); // setting text size to 1
//tft.setCursor(4, 0); // move cursor to position (4, 0) pixel
//tft.print("ARDUINO + ST7735 TFT");
tft.setCursor(30, 5); // move cursor to position (25, 5) pixel
tft.print("P.A.R.A MK.3");
// initialize the BMP280 sensor
if ( bmp280.begin(BMP280_I2C_ADDRESS) == 0 )
{ // connection error or device address wrong!
tft.setTextColor(ST77XX_RED, ST77XX_CYAN); // set text color to red and black background
tft.setTextSize(2); // setting text size to 2
tft.setCursor(5, 76); // move cursor to position (5, 76) pixel
tft.print("Connection");
tft.setCursor(35, 100); // move cursor to position (35, 100) pixel
tft.print("Error");
while (1); // stay here
}
tft.drawFastHLine(0, 55, tft.width(), ST77XX_CYAN); // draw horizontal seperation line at position (0, 55)pixel
tft.drawFastHLine(0, 95, tft.width(), ST77XX_CYAN); // draw horizontal seperation line at position (0, 195)pixel
tft.setTextColor(ST77XX_GREEN, ST77XX_BLACK); // set text color to red and black background
tft.setCursor(30, 20); // move cursor to position (30, 20) pixel
tft.print("TEMPERATURE "); // setting heading for first section
tft.setTextColor(ST77XX_GREEN, ST77XX_BLACK); // set text color to cyan and black background
tft.setCursor(40, 60); // move cursor to position (40, 60) pixel
tft.print("HUMIDITY "); // setting heading for second section
tft.setTextColor(ST77XX_GREEN, ST7735_BLACK); // set text color to green and black background
tft.setCursor(40, 100); // move cursor to position (40, 100) pixel
tft.print("PRESSURE "); // setting heading for third section
tft.setTextSize(2); // setting text size to 2
}
// main loop
void loop()
{
connectWiFi();
char _buffer[10];
// read temperature, humidity and pressure from the BMP280 sensor
float temp = bmp280.readTemperature(); // get temperature in °C
float hum = dht.readHumidity(); // get humidity in rH%
float pres = bmp280.readPressure(); // get pressure in hPa
// print temperature (in °C)
if (temp < 0) // if temperature < 0
sprintf( _buffer, "-%02u.%02u", (int)abs(temp), (int)(abs(temp) * 100) % 100 );
else // if temperature >= 0
sprintf( _buffer, " %02u.%02u", (int)temp, (int)(temp * 100) % 100 );// setting the value approximation
tft.setTextColor(ST77XX_YELLOW, ST77XX_BLACK); // set text color to yellow and black background
tft.setCursor(11, 34); // move cursor to position (11,34) pixel
tft.print(_buffer); // print temperature from BMP-280 sensor
tft.drawCircle(89, 34, 2, ST77XX_YELLOW); // print the degree symbol ( ° )(can be omitted if * is used instead)
tft.setCursor(95, 34); // move cursor to position (95,34) pixel
tft.print("C"); // print the Celcius symbol
// 2: print humidity (in %)
sprintf( _buffer, "%02u ", (int)(hum)); // setting the value approximation
tft.setTextColor(ST77XX_YELLOW, ST77XX_BLACK); // set text color to magenta and black background
tft.setCursor(45, 74); // move cursor to position (45,74) pixel
tft.print(_buffer); // print humidity from DHT-11 sensor
tft.setCursor(75, 74); // move cursor to position (75,74) pixel
tft.print("%"); // print the percentage symbol
// 3: print pressure (in hPa)
sprintf( _buffer, "%04u.%02u", (int)(pres / 100), (int)((uint32_t)pres % 100) ); // setting the value approximation
tft.setTextColor(ST77XX_YELLOW, ST77XX_BLACK); // set text color to orange and black background
tft.setCursor(3, 112); // move cursor to position (3,112)pixel
tft.print(_buffer); // print atmospheric pressure from BMP-280
tft.setCursor(91, 112); // move cursor to position (91,112)pixel
tft.print("hPa"); // print unit of atmospheric pressure as hecto pascal
delay(10000); // wait 1 second before taking next sensor reading
//convert sensor values to strings
String temperatureStr = dtostrf(temp, 4, 1, _buffer);
temperatureStr.replace(" ", "");
String humidityStr = dtostrf(hum, 4, 1, _buffer);
humidityStr.replace(" ", "");
String pressureStr = dtostrf(pres, 4, 1, _buffer);
pressureStr.replace(" ", "");
updateSensors(temperatureStr, humidityStr, pressureStr);
//wait next sampling cycle
Serial.print("Wait ");
Serial.print(delay_time / 1000);
Serial.println("s for next sampling");
Serial.println();
delay(delay_time);
//initialize new cycle
Serial.println();
Serial.print("Sampling (");
Serial.print(sampletime_ms / 1000);
Serial.println("s)...");
starttime = millis();
}
void updateSensors(String temperatureStr, String humidityStr, String pressureStr) {
String cmd = "AT+CIPSTART=\"TCP\",\"";
cmd += IP;
cmd += "\",80";
monitor.println(cmd);
delay(1000);
cmd = GET;
cmd += temperatureStr;
cmd += "&field2=";
cmd += humidityStr;
cmd += "&field3=";
cmd += pressureStr;
cmd += "\r\n";
delay(1000);
int strsize = cmd.length();
monitor.println("AT+CIPSEND=" + String(strsize));
delay(1000);
monitor.print(cmd);
if (monitor.find("OK")) {
Serial.println("Transmission completed with success");
} else {
Serial.println("Transmission failed!");
}
}
boolean connectWiFi()
{
Serial.println("Connecting wi-fi...");
String cmd = "AT+CWMODE=1";
monitor.println(cmd);
delay(1000);
monitor.flush(); //clear buffer
cmd = "AT+CWJAP=\"";
cmd += SSID;
cmd += "\",\"";
cmd += PASS;
cmd += "\"";
monitor.println(cmd);
delay(250);
if (monitor.find("OK")) {
Serial.println("Connection succeeded!");
return true;
} else {
Serial.println("Connection failed!");
return false;
}
Serial.println();
}
The diagram is more or likely like this, I know its an nano board, the problem is as same as when I use the uno
