Separate values from a string
Posted: Mon Jul 02, 2018 5:58 amI use a nodemcu with a tft-display to show "weatherdata" (humidity= 2 digits, airpressure= 4 digits and temperature=3 digits) - I get those three values from my Arduino webserver as one String which contains all three values! What I need to do is to separate the three values and assign each of them to a different variable? This would give me the possibility to locate them in different spots of the display! The whole thing would be more attractive and better readable!!
There are lots of string functions in Arduino but my problem is that I don´t know which of them I should use. And - since I never did this before I honestly don´t know how this is to be done!!
I would really appreciate your help - heres the sketch of my nodemcu:
There are lots of string functions in Arduino but my problem is that I don´t know which of them I should use. And - since I never did this before I honestly don´t know how this is to be done!!
I would really appreciate your help - heres the sketch of my nodemcu:
Code: Select all
#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>
#include <ESP8266HTTPClient.h>
#define Serial Serial
#include "Adafruit_GFX.h"
#include "Adafruit_ILI9340.h"
#include "SPI.h"
ESP8266WiFiMulti WiFiMulti;
//Pinout of display
#define TFT_CS D0 // GPIO 16
#define TFT_RST 10 // D12 GPIO10
#define TFT_DC D1 // GPIO 5
#define TFT_MOSI D7 // GPIO 13
#define TFT_CLK D5 // GPIO 14
#define TFT_MISO D6 // GPIO 12
Adafruit_ILI9340 tft = Adafruit_ILI9340(TFT_CS, TFT_DC, TFT_RST);
#define ROTATION_NO 0
#define ROTATION_90 1
#define ROTATION_180 2
#define ROTATION_270 3
String weatherdata;
void setup() {
Serial.begin(115200);
// Serial.setDebugOutput(true);
Serial.println();
Serial.println();
Serial.println();
for (uint8_t t = 4; t > 0; t--) {
Serial.printf("[SETUP] WAIT %d...\n", t);
Serial.flush();
delay(1000);
}
WiFi.mode(WIFI_STA);
WiFiMulti.addAP("", "");
tft.begin();
tft.setRotation( ROTATION_270);
tft_printframe();
tft_printcaption();
}
//Void setup() end
void tft_printcaption(void)
{
tft.setTextColor(ILI9340_WHITE);
//tft.setCursor( 10,55);
//tft.setTextSize(2);
//tft.print("");
tft.setTextSize(1);
//tft.print("O");
tft.setTextSize(3);
//tft.print("C");
tft.setTextSize(2);
tft.setCursor( 50, 15);
tft.print(" HPascal");
tft.setTextSize(2);
tft.setCursor( 10, 210);
tft.print(" Percent");
}
void tft_printframe( )
{
tft.fillScreen(ILI9340_BLACK);
tft.drawRoundRect(1, 0, tft.width() - 1, 40, 10, ILI9340_BLUE);
tft.drawRoundRect(1, 50, tft.width() - 1, 135, 10, ILI9340_GREEN);
tft.drawRoundRect(0, 200, tft.width() - 1, 40, 10, ILI9340_RED);
}
void tft_show_weatherdata()
{
tft.setTextSize(4);
tft.setTextColor(ILI9340_YELLOW, ILI9340_BLACK );
tft.setCursor(0, 50);
tft.print(weatherdata);
}
void loop(void) {
// wait for WiFi connection
if ((WiFiMulti.run() == WL_CONNECTED)) {
HTTPClient http;
Serial.print("[HTTP] begin...\n");
// configure traged server and url
http.begin("http://192.168.1.15/?mode=text");
Serial.print("[HTTP] GET...\n");
// start connection and send HTTP header
int httpCode = http.GET();
// httpCode will be negative on error
if (httpCode > 0) {
// HTTP header has been send and Server response header has been handled
Serial.printf("[HTTP] GET... code: %d\n", httpCode);
Serial.println();
// file found at server
if (httpCode == HTTP_CODE_OK) {
weatherdata = http.getString(); // That´s the variable that i want to split!!
Serial.println(weatherdata);
tft_show_weatherdata();
}
}
else {
Serial.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
}
http.end();
}
}