Read from analog pin and generate HTTP POST message with data on an Arduino Nano 33 IOT

light_sensor_iot_practice.ipynb

read_pin_and_post.cpp

/*
  Will take the reading on analog pin 0 and pass the data
  via HTTP POST method to a server expecting it (Flask
  on a Pi)
  Original by Tom Igoe
*/
#include <ArduinoHttpClient.h>
#include <WiFiNINA.h>


///////please enter your sensitive data in the Secret tab/arduino_secrets.h
/////// Wifi Settings ///////
char ssid[] = YOUR_SSID;        
char pass[] = YOUR_WIFI_PASSWORD; 

char serverAddress[] = "192.168.1.18";  // server address
int port = 5000;

WiFiClient wifi;
HttpClient client = HttpClient(wifi, serverAddress, port);
int status = WL_IDLE_STATUS;

void setup() {
  //Initialize serial and wait for port to open:
  //Serial.begin(9600);

  // check for the WiFi module:
  if (WiFi.status() == WL_NO_MODULE) {
    //Serial.println("Communication with WiFi module failed!");
    // don't continue
    while (true);
  }

  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:
    status = WiFi.begin(ssid, pass);

    // wait 10 seconds for connection:
    delay(10000);
  }
  // you're connected now, so print out the status:
  //printWifiStatus();
}

void loop() {

  postRequest();
  delay(1000);
}

void printWifiStatus() {
  // print the SSID of the network you're attached to:
  Serial.print("==========");
  Serial.print("SSID: ");
  Serial.println(WiFi.SSID());

  // print your board's IP address:
  IPAddress ip = WiFi.localIP();
  Serial.print("IP Address: ");
  Serial.println(ip);

  // print the received signal strength:
  long rssi = WiFi.RSSI();
  Serial.print("signal strength (RSSI):");
  Serial.print(rssi);
  Serial.println(" dBm");
  Serial.print("==========");
  Serial.print("");
}

void postRequest() {
  // Here we read the data from pin 0

  int sensorValue = analogRead(A0);
  // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 3.3V):
  float voltage = sensorValue * (3.3 / 1023.0);
  // print out the value you read:
  //Serial.println(voltage);



  // Here we make the actual post request
  //Serial.println("Making POST request");
  String contentType = "application/x-www-form-urlencoded";
  String postData = "raw=" + String(sensorValue) + "&voltage=" + String(voltage);

  client.post("/", contentType, postData);

  // read the status code and body of the response
  int statusCode = client.responseStatusCode();
  String response = client.responseBody();

  //Serial.print("Status code: ");
  //Serial.println(statusCode);
  //Serial.print("Response: ");
  //Serial.println(response);
}