I’m working on a project, the idea is to have heart pulse sensor data to be posted on ubidot platform using NodeMCU ESP8266. However, now in my developing phase I’ve runned into a Soft WDT reset issue.
Here is the code
#include <Wire.h>
#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include “UbidotsESPMQTT.h”
#include <SoftwareSerial.h>
String myString; // complete message from arduino, which consistors of snesors data
char rdata; // received charactors
String myBPM;
#define TOKEN “” // Your Ubidots TOKEN
#define WIFINAME “” //Your SSID
#define WIFIPASS “******************” // Your Wifi Pass
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
Ubidots client(TOKEN);
void callback(char* topic, byte* payload, unsigned int length)
{
Serial.print(“Message arrived [”);
Serial.print(topic);
Serial.print("] ");
for (int i = 0; i < length; i++)
{
Serial.print((char)payload[i]);
}
Serial.println();
}
void setup()
{
client.setDebug(true); // Pass a true or false bool value to activate debug messages
Serial.begin(9600);
if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C))
{
Serial.println(F(“SSD1306 allocation failed”));
for (;;); // Don’t proceed, loop forever
}
display.display();
delay(100);
display.clearDisplay();
client.wifiConnection(WIFINAME, WIFIPASS);
client.begin(callback);
}
void loop()
{
if (Serial.available() > 0 )
{
rdata = Serial.read();
myString = myString + rdata;
if ( rdata == ‘\n’)
{
Serial.println(myString);
myBPM = getValue(myString, ‘,’, 0);
myString = “”;
}
if (!client.connected())
{
client.reconnect();
}
int BPMvalue = myBPM.toInt();
client.add(“BPM”, BPMvalue);
client.ubidotsPublish(“ESP8266”);
client.loop();
Serial.println();
delay(100);
}
display.clearDisplay();
display.setTextSize(2);
display.setTextColor(WHITE);
display.setCursor(10, 30);
display.print(“BPM”);
//display.setCursor(5, 40);
display.print(myBPM);
display.display();
}
String getValue(String data, char separator, int index)
{
int found = 0;
int strIndex = { 0, -1 };
int maxIndex = data.length() - 1;
for (int i = 0; i <= maxIndex && found <= index; i++)
{
if (data.charAt(i) == separator || i == maxIndex)
{
found++;
strIndex[0] = strIndex[1] + 1;
strIndex[1] = (i == maxIndex) ? i + 1 : i;
}
}
return found > index ? data.substring(strIndex[0], strIndex[1]) : “”;
}
