I've been making project lately and im hard stuck to this problem. After i tap the rfid card in esp8266 it send the data okay but after that the serial monitor displaying a code 302 problem and now i can't tap my card again and it stop the program completely. The logic i've been working was if the user or card tap in rfid sensor it will in put in 4 columns. In Column A it will generate the Date and Column B Time in or Time Out I want that if the user tap once it will input like this "TIME IN (8:30 AM)" and if afternoon "TIME IN (8:30 PM)" it will like this and if the the user tap again I want to send another data to make it in another row the TIME OUT logic.
//Arduino Code#include <SPI.h>#include <MFRC522.h>#include <Arduino.h>#include <ESP8266WiFi.h>#include <ESP8266HTTPClient.h>#include <WiFiClientSecureBearSSL.h>#include <TimeLib.h> // Include library to work with time#define RST_PIN D3#define SS_PIN D4#define BUZZER D8MFRC522 mfrc522(SS_PIN, RST_PIN);MFRC522::MIFARE_Key key;MFRC522::StatusCode status;bool isTimeIn = true; // Variable to track if it's a Time In or Time Out tapbyte readBlockData[18]; // Declare byte array for reading block databyte bufferLen = 18; // Buffer length for reading block dataString card_holder_name;const String sheet_url = "https://script.google.com/macros/s//exec"; #define WIFI_SSID "" #define WIFI_PASSWORD "" void setup(){ Serial.begin(9600); WiFi.begin(WIFI_SSID, WIFI_PASSWORD); while (WiFi.status() != WL_CONNECTED){ delay(200); } pinMode(BUZZER, OUTPUT); SPI.begin(); mfrc522.PCD_Init(); // Initialize the RFID reader once during setup}void loop(){ if (!mfrc522.PICC_IsNewCardPresent()) { return; } if (!mfrc522.PICC_ReadCardSerial()) { return; } ReadDataFromBlock(2, readBlockData); // Read block 2 from the RFID card String current_time = getFormattedTime(); // Get the formatted time String time_status = (isTimeIn) ? "TIME IN (" + current_time +")" : "TIME OUT (" + current_time +")"; isTimeIn = !isTimeIn; // Toggle between Time In and Time Out if (WiFi.status() == WL_CONNECTED) { std::unique_ptr<BearSSL::WiFiClientSecure> client(new BearSSL::WiFiClientSecure); client->setInsecure(); HTTPClient https; String postData = "{\"name\":\"" + String((char*)readBlockData) +"\", \"time_status\":\"" + time_status +"\", \"location\":\"Computer Lab\"}"; if (https.begin(*client, sheet_url)) { https.addHeader("Content-Type", "application/json"); int httpCode = https.POST(postData); if (httpCode > 0) { Serial.printf("[HTTPS] POST... code: %d\n", httpCode); } https.end(); } } delay(1000);}void ReadDataFromBlock(int blockNum, byte readBlockData[]) { for (byte i = 0; i < 6; i++) { key.keyByte[i] = 0xFF; // Default key for RFID cards } status = mfrc522.PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_A, blockNum, &key, &(mfrc522.uid)); if (status == MFRC522::STATUS_OK) { status = mfrc522.MIFARE_Read(blockNum, readBlockData, &bufferLen); // Use bufferLen for the size of data if (status != MFRC522::STATUS_OK) { Serial.println("Failed to read block."); } } else { Serial.println("Authentication failed."); }}String getFormattedTime() { int hour = hourFormat12(); // 12-hour format String meridiem = isAM() ? "AM" : "PM"; String minuteString = (minute() < 10) ? "0" + String(minute()) : String(minute()); // Correct use of minute() return String(hour) +":" + minuteString +" " + meridiem;}//Google Script Codefunction doPost(e) { try { // Open the Google Sheet using its ID var sheet = SpreadsheetApp.openById("1cPUd1xJwk_RXOlhZQZJUkFp6dK-dOfYOOUgVKEJzmCU").getSheetByName("Sheet1"); // Parse the incoming request payload var data = JSON.parse(e.postData.contents); // Get the current date var currentDate = Utilities.formatDate(new Date(), Session.getScriptTimeZone(), "MM/dd/yyyy"); // Get the time status (TIME IN or TIME OUT), location, and name from the request var timeStatus = data.time_status; // Format: TIME IN (08:26 AM) or TIME OUT (08:26 PM) var location = data.location; // Example: "Computer Lab" var name = data.name; // Name from RFID card data // Append a new row with the data: [Date, Time Status, Location, Name] sheet.appendRow([currentDate, timeStatus, location, name]); // Send a success response back to the ESP8266 return ContentService.createTextOutput("Success"); } catch (error) { // If an error occurs, return it in the response return ContentService.createTextOutput("Error: " + error.message); }}This was only the result after i tap the card once and recieved in the serial monitor a code 302The Code 302 in Serial Monitor