Matlab Visualization Code (works properly) My first 3 lines of information display properly on my giga display shield. The 4th line which is supposed to be a timestamp stored in my field as text (ex: Displays as -1, not the text timestamp I am looking for. Any help is appreciated. % Read the last entry and its timestamp [data, timestamps] = thingSpeakRead(x, 'NumPoints', 1); % Add a timezone offset of 5 hours localTime = timestamps - hours(5); % Display the local timestamp as text text(0.5, 0.5, datestr(localTime), 'FontSize', 20, 'HorizontalAlignment', 'center'); axis off; Note - sensitive info replaced with X Arduino code #include <WiFi.h> //library for connecting to WiFi #include <ThingSpeak.h> //library for reading data from ThingSpeak #include "Arduino_GigaDisplay_GFX.h" //library for using the GigaDisplay shield //define WiFi credentials const char* ssid = "x"; const char* password = "x"; WiFiClient client; String textData = ""; //define ThingSpeak channel IDs and read APIs unsigned long lakeChannelID = x; const char* lakeReadAPI = "x"; //define GigaDisplay object GigaDisplay_GFX display; #define BLACK 0x0000 #define WHITE 0xFFFF #define NEW 0xFF6B35 void setup() { //initialize serial communication for debugging Serial.begin(9600); //connect to WiFi WiFi.begin(ssid, password); Serial.print("Connecting to WiFi..."); while (WiFi.status() != WL_CONNECTED) { delay(1000); Serial.print("."); } Serial.println("Connected!"); Serial.print("IP address: "); Serial.println(WiFi.localIP()); ThingSpeak.begin(client); // Initialize ThingSpeak display.begin(); } void loop() { float homeTemp = ThingSpeak.readFloatField(lakeChannelID, 8, lakeReadAPI); float lakeTemp1 = ThingSpeak.readFloatField(lakeChannelID, 1, lakeReadAPI); float lakeTemp2 = ThingSpeak.readFloatField(lakeChannelID, 2, lakeReadAPI); float lakeTemp3 = ThingSpeak.readFloatField(lakeChannelID, 3, lakeReadAPI); float lakeTemp4 = ThingSpeak.readFloatField(lakeChannelID, 4, lakeReadAPI); float lakeTemp5 = ThingSpeak.readFloatField(lakeChannelID, 5, lakeReadAPI); float lakeTemp6 = ThingSpeak.readFloatField(lakeChannelID, 6, lakeReadAPI); String textData = ThingSpeak.readStringField(lakeChannelID,7, lakeReadAPI); float lakeTempOutAvg = (lakeTemp1 + lakeTemp2 + lakeTemp3)/3; float lakeTempUnderAvg = (lakeTemp4 + lakeTemp5 + lakeTemp6)/3; long statuscode = ThingSpeak.getLastReadStatus(); if (statuscode == 200) { //print temperature data to serial monitor for debugging Serial.print("Home Outside Temp: "); Serial.println(homeTemp); Serial.print("Lake Outside Temp: "); Serial.println(lakeTemp1); Serial.print("Lake Outside Average: "); Serial.println(lakeTempOutAvg); Serial.print("Lake Under Average: "); Serial.println(lakeTempUnderAvg); Serial.print("Last Read: "); Serial.println(textData); //clear display and set cursor to top left corner display.setRotation(1); // -90 degrees rotation display.fillScreen(BLACK); display.setTextColor(NEW); display.setTextSize( 5); display.setCursor(50, 10); // Adjusted for rotated display display.print("Home Outdoors"); display.setCursor(200, 60); // Adjusted for rotated display display.print(homeTemp, 1); display.print(" F"); display.setCursor(50, 120); // Adjusted for rotated display display.print("Lake Outdoors"); display.setCursor(200, 170); // Adjusted for rotated display display.print(lakeTempOutAvg, 1); display.print(" F"); display.setCursor(50, 230); // Adjusted for rotated display display.print("Lake Under House"); display.setCursor(200, 280); // Adjusted for rotated display display.print(lakeTempUnderAvg, 1); display.print(" F"); display.setCursor(50, 340); // Adjusted for rotated display display.print("Data Last Reported"); display.setCursor(200, 390); // Adjusted for rotated display display.print(textData); //wait for 10 seconds before updating again delay(10000); } } //Code sourced from ThingSpeak and GigaDisplay libraries.
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