First draft for an Arduino sensor
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184
arduino-sensor/arduino-sensor.ino
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184
arduino-sensor/arduino-sensor.ino
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#include <ESP8266WiFi.h>
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#include <EEPROM.h>
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#include <DHT.h>
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const char* ssid = "FLRLAN";
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const char* password = "XXXXXX";
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#define DHT_PIN 4
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DHT dht(DHT_PIN, DHT22);
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WiFiServer server(80);
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void setup() {
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Serial.begin(115200);
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dht.begin();
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EEPROM.begin(512);
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delay(10);
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// Connect to WiFi network
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Serial.println();
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Serial.println();
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Serial.print("Connecting to ");
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Serial.println(ssid);
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WiFi.begin(ssid, password);
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while (WiFi.status() != WL_CONNECTED) {
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delay(500);
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Serial.print(".");
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}
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Serial.println("");
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Serial.println("WiFi connected");
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// Start the server
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server.begin();
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Serial.println("Server started");
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// Print the IP address
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Serial.print("Use this URL to connect: ");
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Serial.print("http://");
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Serial.print(WiFi.localIP());
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Serial.println("/");
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}
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#define REQ_SLP 0
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#define REQ_SET 1
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#define REQ_ERR 99
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void loop() {
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// Check if a client has connected
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WiFiClient client = server.available();
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if (!client) {
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return;
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}
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// Wait until the client sends some data
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Serial.println("new client");
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while(!client.available()){
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delay(1);
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}
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// Read the first line of the request
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String requestStr = client.readStringUntil('\r');
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Serial.println(requestStr);
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client.flush();
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int idxSpace = requestStr.indexOf(" ");
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requestStr = requestStr.substring(idxSpace + 1);
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int idxSndSpace = requestStr.indexOf(" ");
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requestStr = requestStr.substring(0, idxSndSpace);
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// Match the request
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int value = REQ_ERR;
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String parameter = "";
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if (requestStr.indexOf("/SLEEP=") != -1) {
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value = REQ_SLP;
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int idx = requestStr.indexOf("/SLEEP=");
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parameter = requestStr.substring(idx + 7);
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} else if (requestStr.indexOf("/SET=") != -1) {
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value = REQ_SET;
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int idx = requestStr.indexOf("/SET=");
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parameter = requestStr.substring(idx + 5);
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} else {
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value = REQ_ERR;
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}
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// Headers of the response
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client.println("HTTP/1.1 200 OK");
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client.println("Content-Type: text/html");
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client.println("");
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// HTML part
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client.println("<!DOCTYPE HTML>");
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client.println("<html>");
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client.println("<h1>");
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client.println(getNodeId());
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client.println("</h1>");
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float h = dht.readHumidity();
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float t = dht.readTemperature();
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while (isnan(h) || isnan(t)) {
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h = dht.readHumidity();
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t = dht.readTemperature();
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}
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client.print ("Temperature: ");
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client.print (t);
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client.print (" *C");
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client.println("<br>");
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client.print ("Humidity: ");
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client.print (h);
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client.print ("%");
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client.println("<br>");
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client.print("Request is ");
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client.println(value);
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client.print("Parameter is ");
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client.println(parameter);
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client.println("<br><br>");
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client.println("</html>");
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client.stop();
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delay(1);
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Serial.println("Client disonnected");
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if (value == REQ_SLP) {
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int sleepTime = parameter.toInt() * 1e6;
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Serial.print("Going to sleep for ");
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Serial.print(sleepTime);
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Serial.print(" nanoseconds");
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ESP.deepSleep(sleepTime);
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} else if (value == REQ_SET) {
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setNodeId(parameter);
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}
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}
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#define LENGTH_ID 10
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void setNodeId(String value) {
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const char* c = value.c_str();
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size_t addr = 0x0;
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int givenLength = strlen(c);
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if (givenLength >= LENGTH_ID) {
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givenLength = LENGTH_ID;
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}
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size_t i = 0;
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for (; i < givenLength; i++) {
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EEPROM.write(addr + i, (uint8_t) c[i]);
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}
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for (; i < LENGTH_ID; i++) {
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EEPROM.write(addr + i, 0);
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}
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EEPROM.commit();
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}
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String getNodeId() {
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size_t addr = 0x0;
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char* eepromId = new char[LENGTH_ID];
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for (size_t i = 0; i < LENGTH_ID; i++) {
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uint8_t temp = EEPROM.read(addr + i);
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eepromId[i] = temp;
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}
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return String(eepromId);
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}
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