#include <ESP8266WiFi.h>
#include <WiFiUdp.h>
#include <time.h>
#include <OneWire.h>
#include <DallasTemperature.h>
extern "C" {
#include "user_interface.h"
}
#define ONE_WIRE_BUS 2 // DS18B20 pin
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature DS18B20(&oneWire);
WiFiUDP Udp;
IPAddress remoteIP(10,10,10,10); //graphite server
unsigned int remotePort = 2003; //graphite server port
unsigned int localPort = 2003;
const char* ssid = "wifi_network_ssid";
const char* password = "wifi_network_password";
void setup() {
Serial.begin(115200);
delay(200);
pinMode(LED_BUILTIN, OUTPUT);
WiFi.setSleepMode(WIFI_LIGHT_SLEEP);
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
Serial.println();
Serial.println("Wait for WiFi... ");
while(WiFi.status() != WL_CONNECTED) {
Serial.print(".");
delay(500);
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
//void configTime(int timezone, int daylightOffset_sec, const char* server1, const char* server2, const char* server3)
configTime(0, 0, "0.europe.pool.ntp.org");
//checking if time is synced properly, if not - retrying
Serial.println("Waiting for time");
while(time(nullptr) <= 100000) {
Serial.print(".");
delay(100);
}
Serial.println("NTP synced");
//blinking led if wifi is connected and time is synced
for (int i=1;i<10;i++){
digitalWrite(LED_BUILTIN, LOW);
delay(50);
digitalWrite(LED_BUILTIN, HIGH);
delay(50);
}
}
void loop() {
send_temperature_to_graphite();
send_wifi_rssi_to_graphite();
Serial.println("Delay for 50 seconds");
delay(50000);
}
void send_temperature_to_graphite() {
time_t now = time(nullptr);
// temperature section
char graphite_temperature[100];
float temp;
DS18B20.requestTemperatures();
delay(5000);
temp = DS18B20.getTempCByIndex(0);
/* example of graphite_temperature_string:
* esp.temp 23.87 1540228668
*/
String graphite_temperature_string = "esp.temp " + String(temp) + " " + now;
graphite_temperature_string.toCharArray(graphite_temperature, 100);
Udp.beginPacket(remoteIP, remotePort);
Udp.write(graphite_temperature);
Udp.endPacket();
}
void send_wifi_rssi_to_graphite() {
time_t now = time(nullptr);
// wifi rssi section
char graphite_rssi[100];
int rssi = WiFi.RSSI();
String ssid = WiFi.SSID();
/* example of graphite_rssi_string:
* esp.rssi.JAN -52 1540228502
*/
String graphite_rssi_string = "esp.rssi." + ssid + " " + rssi + " " + now;
graphite_rssi_string.toCharArray(graphite_rssi, 100);
Udp.beginPacket(remoteIP, remotePort);
Udp.write(graphite_rssi);
Udp.endPacket();
}