Update with initial release

.gitignore

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+config.h

teasense.ino

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+/*
+ * teasense.ino - Arduino code for the tea sensor
+ * Copyright (C) 2023 William Moore
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of  MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+ 
+ // Coded for the Arduino Uno WiFi rev. 2
+// Uses a standard PT100 RTD and the Adafruit MAX 31865 interface.
+
+#include <SPI.h>
+#include <WiFiNINA.h>
+#include <Adafruit_MAX31865.h>
+
+// Create a file called config.h that contains the following:
+// char ssid[] = "SSID";
+// char pass[] = "Password";
+
+#include "config.h"
+
+// Use software SPI: CS, DI, DO, CLK
+Adafruit_MAX31865 thermo = Adafruit_MAX31865(10, 11, 12, 13);
+#define RREF 430.0
+// The 'nominal' 0-degrees-C resistance of the sensor
+// 100.0 for PT100, 1000.0 for PT1000
+#define RNOMINAL 100.0
+
+int status = WL_IDLE_STATUS;  //connection status
+const int port = 80;
+WiFiServer server(port);
+
+void setup() {
+  Serial.begin(9600);
+
+  thermo.begin(MAX31865_3WIRE);  // set to 2WIRE or 4WIRE as necessary
+
+  Serial.println("Welcome to teasense!");
+
+  String fv = WiFi.firmwareVersion();
+  if (fv < WIFI_FIRMWARE_LATEST_VERSION) {
+    Serial.println("Please upgrade the firmware");
+  }
+
+  // attempt to connect to WiFi network:
+  while (status != WL_CONNECTED) {
+    Serial.print("Attempting to connect to SSID: ");
+    Serial.println(ssid);
+    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
+    WiFi.setHostname("teasensor");
+    status = WiFi.begin(ssid, pass);
+
+    // wait 10 seconds for connection:
+    delay(10000);
+  }
+  server.begin();
+  // you're connected now, so print out the status:
+  printWifiStatus();
+  
+}
+
+void printWifiStatus() {
+  // print the SSID of the network you're attached to:
+  Serial.print("SSID: ");
+  Serial.println(WiFi.SSID());
+
+  // print your board's IP address:
+  IPAddress ip = WiFi.localIP();
+  Serial.print("IP Address: ");
+  Serial.println(ip);
+
+  IPAddress gw = WiFi.gatewayIP();
+  Serial.print("Gateway IP: ");
+  Serial.println(gw);
+
+  // print the received signal strength:
+  long rssi = WiFi.RSSI();
+  Serial.print("signal strength (RSSI):");
+  Serial.print(rssi);
+  Serial.println(" dBm");
+}
+
+void enable_WiFi() {
+
+  String fv = WiFi.firmwareVersion();
+  if (fv < "1.0.0") {
+    Serial.println("Please upgrade the firmware");
+  }
+  Serial.println(fv);
+}
+
+void connect_WiFi() {
+  // attempt to connect to Wifi network:
+
+  // while (status != WL_CONNECTED) {
+    Serial.print("Attempting to connect to SSID: ");
+    Serial.println(ssid);
+    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
+    WiFi.disconnect();
+    
+    status = WiFi.begin(ssid, pass);
+    // wait 10 seconds for connection:
+    delay(5000);
+  // }
+}
+
+int resetCounter = 0;
+
+void loop() {
+  WiFiClient client = server.available();
+  if (client) {
+    Serial.println("new client");  // print a message out the serial port
+    String currentLine = "";       // make a String to hold incoming data from the client
+    if (client.connected()) {
+      Serial.println("Reading data from sensor");
+      String postData = "{\"temperature\": ";
+      postData += thermo.temperature(RNOMINAL, RREF);
+      postData += "}";
+      // Serial.println(postData);
+      String httpResponse = "HTTP/1.1 200 OK\r\n";
+      httpResponse += "Content-type: application/json\r\n";
+      httpResponse += "Connection: close\r\n\r\n";
+      httpResponse += postData;
+      client.print(httpResponse);
+      Serial.println("HTTP Data Written");
+    }
+    delay(1);
+    Serial.println("Data written");
+    client.stop();
+  }
+}