ThingSpeak

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I am trying to collect battery voltage data from arduino parts and upload it from arduino into my Thingspeak channel. So far, I have troubleshot the hardware/wiring aspect, and that doesn't seem to be the issue. At this point, I am assuming the issue is with the code or the Thingspeak channel. Since my arduino board (elegoo arduino Uno R3) is hooked up to my computer using a USB cord, I tried using an HTTP GET request in order to send the information to the Thingspeak channel. I am under a time crunch and am unable to access any kind of Wifi or Ethernet shield, so that is why I am using the USB cord. I could be completely wrong in using the HTTP GET request --I am quite the novice here! Here is the code so far: #include <SoftwareSerial.h> SoftwareSerial Serial1(2, 3); // RX, TX // Define variables float voltage; unsigned long previousMillis = 0; const long interval = 60000; // Upload interval (in milliseconds) String apiKey = "P5LPXSRJT0G4K7VA"; String field = "field1"; String server = "api.thingspeak.com"; String channelID = "2131761"; void setup() { Serial.begin(9600); Serial1.begin(9600); } void loop() { // Read voltage from sensor voltage = analogRead(A0) * 0.0049; // convert analog reading to voltage (0-5V) voltage = voltage * 5.17; // adjust the voltage to reflect the actual voltage // Print voltage to serial monitor Serial.print("Voltage: "); Serial.print(voltage); Serial.println(" V"); // Get current timestamp unsigned long currentMillis = millis(); // Check it's time to upload to ThingSpeak if (currentMillis - previousMillis >= interval) { // Update timestamp previousMillis = currentMillis; // Construct HTTP GET request String getRequest = "GET /update?api_key="; getRequest += apiKey; getRequest += "&"; getRequest += field; getRequest += "="; getRequest += String(voltage); getRequest += "&"; getRequest += "field2=Times"; getRequest += " HTTP/1.1\r\n"; getRequest += "Host: "; getRequest += server; getRequest += "\r\n"; getRequest += "Connection: close\r\n\r\n"; getRequest += "X-THINGSPEAK-CLIENT: arduino\r\n"; getRequest += "Content-Type: application/x-www-form-urlencoded\r\n"; getRequest += "Content-Length: "; getRequest += String(voltage); getRequest += "\r\n"; getRequest += "Host: api.thingspeak.com\r\n"; getRequest += "User-Agent: Arduino/1.0.0\r\n"; getRequest += "\r\n"; getRequest += "\r\n"; getRequest += channelID; // Send HTTP GET request to ThingSpeak via serial communication Serial1.println(getRequest); // Print response from ThingSpeak to serial monitor while (Serial1.available()) { Serial.write(Serial1.read()); } Serial.println(); } delay(1000); } Again, I really have no clue what I am doing here, so I am not surprised if what I have is entirely wrong. Any feedback is greatly appreciated!