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environmental-sensor.ino
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environmental-sensor.ino
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#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>
#define SEALEVELPRESSURE_HPA (1013.25)
Adafruit_BME280 bme;
const boolean debug = false;
const uint8_t bme_i2c_address = 0x76;
const char* ssid = "xxxxxxxx";
const char* password = "xxxxxxxx";
ESP8266WebServer server(80);
String mimeType;
String response;
String state;
const int led = 13;
void handleRoot() {
digitalWrite(led, 1);
response = "";
response += "<html>";
response += "<head>";
response += "<title>Environmental Sensor (ESP8266, BME280)</title>";
response += "<style>* {font-family: 'Droid Sans', Arial, Verdana, sans-serif;}</style>";
response += "</head>";
response += "<body>";
response += "<p>Environmental Sensor based on esp8266 & Bosch BME280.<br>Paths available:</p>";
response += "<ul>";
response += "<li><a href=\"/state\">Sensor State</a></li>";
response += "<li><a href=\"/summary\">Sensor Summary</a></li>";
response += "<li><a href=\"/temperature\">Temperature Value</a></li>";
response += "<li><a href=\"/pressure\">Pressure Value</a></li>";
response += "<li><a href=\"/humidity\">Humidity Value</a></li>";
response += "<li><a href=\"/altitude\">Altitude Value (approx.)</a></li>";
response += "</ul>";
response += "</body>";
response += "</html>";
mimeType = "text/html";
server.send(200, mimeType, response);
digitalWrite(led, 0);
}
void handleState() {
digitalWrite(led, 1);
response = state;
mimeType = "text/plain";
server.send(200, mimeType, response);
digitalWrite(led, 0);
}
void handleSummary() {
digitalWrite(led, 1);
response = "";
response += "<html>";
response += "<head>";
response += "<title>Environmental Sensor (ESP8266, BME280)</title>";
response += "<style>* {font-family: 'Droid Sans', Arial, Verdana, sans-serif;}</style>";
response += "<meta http-equiv=\"refresh\" content=\"1\" >";
response += "</head>";
response += "<body>";
response += "<p>Environmental Sensor based on esp8266 & Bosch BME280.<br>Paths available:</p>";
response += "<table>";
response += "<thead><td>Sensor</td><td>Value</td><td>Unit</td></tr>";
response += "<tr>";
response += "<td>Temperature</td>";
response += "<td>";
response += bme.readTemperature();
response += "</td>";
response += "<td>°C</td>";
response += "</tr>";
response += "<tr>";
response += "<td>Pressure</td>";
response += "<td>";
response += (bme.readPressure() / 100.0F);
response += "</td>";
response += "<td>hPa</td>";
response += "</tr>";
response += "<tr>";
response += "<td>Humidity</td>";
response += "<td>";
response += bme.readHumidity();
response += "</td>";
response += "<td>%</td>";
response += "</tr>";
response += "<tr>";
response += "<td>Altitude (beta / approx.)</td>";
response += "<td>";
response += bme.readAltitude(SEALEVELPRESSURE_HPA);
response += "</td>";
response += "<td>m</td>";
response += "</tr>";
response += "</table>";
response += "<a href=\"/\">Back</a>";
response += "</body>";
response += "</html>";
mimeType = "text/html";
server.send(200, mimeType, response);
if (debug) {
Serial.println(response);
}
digitalWrite(led, 0);
}
void handleTemperature() {
digitalWrite(led, 1);
response = "";
response += bme.readTemperature();
mimeType = "text/plain";
server.send(200, mimeType, response);
Serial.print(response);
digitalWrite(led, 0);
}
void handlePressure() {
digitalWrite(led, 1);
response = "";
response += (bme.readPressure() / 100.0F);
mimeType = "text/plain";
server.send(200, mimeType, response);
Serial.print(response);
digitalWrite(led, 0);
}
void handleHumidity() {
digitalWrite(led, 1);
response = "";
response += bme.readHumidity();
mimeType = "text/plain";
server.send(200, mimeType, response);
Serial.print(response);
digitalWrite(led, 0);
}
void handleAltitude() {
digitalWrite(led, 1);
response = "";
response += bme.readAltitude(SEALEVELPRESSURE_HPA);
mimeType = "text/plain";
server.send(200, mimeType, response);
Serial.print(response);
digitalWrite(led, 0);
}
void handleNotFound(){
digitalWrite(led, 1);
String message = "File Not Found\n\n";
message += "URI: ";
message += server.uri();
message += "\nMethod: ";
message += (server.method() == HTTP_GET)?"GET":"POST";
message += "\nArguments: ";
message += server.args();
message += "\n";
for (uint8_t i=0; i<server.args(); i++){
message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
}
mimeType = "text/plain";
server.send(404, mimeType, message);
digitalWrite(led, 0);
}
void setup(void){
String message = "";
pinMode(led, OUTPUT);
digitalWrite(led, 0);
Serial.begin(115200);
WiFi.begin(ssid, password);
Serial.println("");
// Wait for connection
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
message += "Connected to ";
message += ssid;
message += "\n";
message += "IP address : ";
message += WiFi.localIP().toString();
message += "\n";
state += message;
Serial.println(message);
if (MDNS.begin("esp8266")) {
message = "mDNS responder started.\n";
state += message;
Serial.print(message);
}
server.on("/", handleRoot);
server.on("/state", handleState);
server.on("/summary", handleSummary);
server.on("/temperature", handleTemperature);
server.on("/pressure", handlePressure);
server.on("/humidity", handleHumidity);
server.on("/altitude", handleAltitude);
server.onNotFound(handleNotFound);
server.begin();
message = "HTTP server started.\n";
state += message;
Serial.print(message);
//init BMP280
if (!bme.begin(bme_i2c_address)) {
message = "BME280 not found ! Check wiring & I2C address.\n";
}
else {
message = "BME280 found.\n";
}
state += message;
Serial.print(message);
}
void loop(void){
server.handleClient();
}