53 lines
1.9 KiB
Markdown
53 lines
1.9 KiB
Markdown
# NTPClient
|
|
|
|
[](https://github.com/arduino-libraries/NTPClient/actions/workflows/check-arduino.yml)
|
|
[](https://github.com/arduino-libraries/NTPClient/actions/workflows/compile-examples.yml)
|
|
[](https://github.com/arduino-libraries/NTPClient/actions/workflows/spell-check.yml)
|
|
|
|
Connect to a NTP server, here is how:
|
|
|
|
```cpp
|
|
#include <NTPClient.h>
|
|
// change next line to use with another board/shield
|
|
#include <ESP8266WiFi.h>
|
|
//#include <WiFi.h> // for WiFi shield
|
|
//#include <WiFi101.h> // for WiFi 101 shield or MKR1000
|
|
#include <WiFiUdp.h>
|
|
|
|
const char *ssid = "<SSID>";
|
|
const char *password = "<PASSWORD>";
|
|
|
|
WiFiUDP ntpUDP;
|
|
|
|
// By default 'pool.ntp.org' is used with 60 seconds update interval and
|
|
// no offset
|
|
NTPClient timeClient(ntpUDP);
|
|
|
|
// You can specify the time server pool and the offset, (in seconds)
|
|
// additionally you can specify the update interval (in milliseconds).
|
|
// NTPClient timeClient(ntpUDP, "europe.pool.ntp.org", 3600, 60000);
|
|
|
|
void setup(){
|
|
Serial.begin(115200);
|
|
WiFi.begin(ssid, password);
|
|
|
|
while ( WiFi.status() != WL_CONNECTED ) {
|
|
delay ( 500 );
|
|
Serial.print ( "." );
|
|
}
|
|
|
|
timeClient.begin();
|
|
}
|
|
|
|
void loop() {
|
|
timeClient.update();
|
|
|
|
Serial.println(timeClient.getFormattedTime());
|
|
|
|
delay(1000);
|
|
}
|
|
```
|
|
|
|
## Function documentation
|
|
`getEpochTime` returns the Unix epoch, which are the seconds elapsed since 00:00:00 UTC on 1 January 1970 (leap seconds are ignored, every day is treated as having 86400 seconds). **Attention**: If you have set a time offset this time offset will be added to your epoch timestamp.
|