ThingSpeak Cloud (Mathworks) | IoT Platform Series - 5

#define SECRET_SSID "xxxxxxx"	// replace MySSID with your WiFi network name
#define SECRET_PASS "xxxxxxx"	// replace MyPassword with your WiFi password

#define SECRET_CH_ID #####	// replace ##### with your channel number
#define SECRET_WRITE_APIKEY "xxxxxx" // replace xxxxxx with your channel write API Key

int temp = random(25,30);
int hum = random(0,100);

#include <WiFi.h>
#include "secrets.h"
#include "ThingSpeak.h" 

char ssid[] = SECRET_SSID;   // your network SSID (name)
char pass[] = SECRET_PASS;   // your network password
int keyIndex = 0;            // your network key Index number (needed only for WEP)
WiFiClient  client;
unsigned long myChannelNumber = SECRET_CH_ID;
const char * myWriteAPIKey = SECRET_WRITE_APIKEY;

// Initialize our values
int temp = random(25,30);
int hum = random(0,100);

void setup() {
Serial.begin(115200);  //Initialize serial
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo native USB port only
}
WiFi.mode(WIFI_STA);
ThingSpeak.begin(client);  // Initialize ThingSpeak
}

void loop() {
// Connect or reconnect to WiFi
if(WiFi.status() != WL_CONNECTED){
Serial.print("Attempting to connect to SSID: ");
Serial.println(SECRET_SSID);
while(WiFi.status() != WL_CONNECTED){
WiFi.begin(ssid, pass);  // Connect to WPA/WPA2 network. Change this line if using open or WEP network
Serial.print(".");
delay(5000);
}
Serial.println("\nConnected.");
}

// set the fields with the values
ThingSpeak.setField(1, temp);
ThingSpeak.setField(2, hum);

// write to the ThingSpeak channel
int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
if(x == 200){
Serial.println("Channel update successful.");
}
else{
Serial.println("Problem updating channel. HTTP error code " + String(x));
}

// change the values
temp = random(25,30);
hum = random(70,80);

delay(20000); // Wait 20 seconds to update the channel again
}

% Channel ID to read data from (Temp-Humid)
readChID = 000000;

% Channel ID to send data (Dew Point)
writeChID = 000000;

% Enter Write API key between the ''
writeAPIKey = 'XXXXXXXXXXX';

% Read temperature and humidity from device
temp = thingSpeakRead(readChID,'Fields',1);
hum = thingSpeakRead(readChID,'Fields',2);
display(hum,'Humidity');
display(temp,'Temperature');

% Calculate and display dew point from device data
dew = temp - ((100-hum)/5);
display(dew,'Dew Point Temp');

% Plot dew point to your channel
thingSpeakWrite(writeChID,dew,'Fields',1,'WriteKey',writeAPIKey);

% Channel ID1 - Temperature Channel
readChannelID1 = 000000;
% Channel ID2 - Dew Channel
readChannelID2 = 0000000;
% Temperature Field ID
TemperatureFieldID = 1;
% Dew Field ID
DewFieldID = 1;

% Channel Read API Key between the '' below:
readAPIKey = 'XXXXXXXXXXX';


[data1, timeStamps] = thingSpeakRead(readChannelID1, 'Fields',TemperatureFieldID,'NumPoints', 10);
[data2, timeStamps] = thingSpeakRead(readChannelID2, 'Fields',DewFieldID,'NumPoints', 10, 'ReadKey', readAPIKey);

% Extract the temperature data from the first column
temperatureData = data1(:, 1);
% Extract the windspeed data from the second column
DewSpeedData = data2(:, 1);

% Visualize Data
yyaxis left
plot(timeStamps, temperatureData);
ylabel('Standard Temp');
yyaxis right
plot(timeStamps, DewSpeedData);
ylabel('Dew Temp');