» Wifi 31: Set RTC from Wifi
This example shows how to set up RTC date and time using the WiFi module and the connection to a NTP server.
Required Materials
1 x Waspmote
1 x Battery
1 x WiFi Module
Notes
- The battery has to be connected.
- Plug the antenna in the SMA connector.
- Remember to set the correct AP settings
- This example can be executed in Waspmote v12 and Waspmote v15
Code
/*
* ------Waspmote WIFI_31 Example--------
*
* Explanation: This example shows how to set up RTC date and time
* using the WiFi module and the connection to a NTP server
*
* Copyright (C) 2015 Libelium Comunicaciones Distribuidas S.L.
* http://www.libelium.com
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Version: 0.1
* Design: David Gascon
* Implementation: Luis Miguel Marti
*/
// Include WIFI library
#include <WaspWIFI.h>
// choose socket (SELECT USER'S SOCKET)
///////////////////////////////////////
uint8_t socket=SOCKET0;
///////////////////////////////////////
// variable to set GMT
///////////////////////////////////////
int8_t gmt=0;
///////////////////////////////////////
// WiFi AP settings (CHANGE TO USER'S AP)
/////////////////////////////////
#define ESSID "libelium_AP"
#define AUTHKEY "password"
/////////////////////////////////
unsigned long previous;
void setup()
{
// Switch on the WIFI module on the desired socket.
if( WIFI.ON(socket) == 1 )
{
USB.println(F("Wifi switched ON"));
}
else
{
USB.println(F("Wifi did not initialize correctly"));
}
// 1. Configure the transport protocol (UDP, TCP, FTP,HTTP...)
WIFI.setConnectionOptions(UDP);
// 2. Configure the way the modules will resolve the IP address.
WIFI.setDHCPoptions(DHCP_ON);
// 3. Set WiFi Authentication key
WIFI.setAuthKey(WPA1,AUTHKEY);
// 4. Configure how to connect the AP
WIFI.setJoinMode(MANUAL);
// 5. Store Values
WIFI.storeData();
// Switch ON RTC
RTC.ON();
// Set GMT (-11 to 13)
RTC.setGMT(1);
}
void loop()
{
// switch WiFi ON
WIFI.ON(socket);
// get actual time
previous=millis();
// If it is manual, call join giving the name of the AP
if (WIFI.join(ESSID))
{
// Now you are connected to AP
USB.print(F("Connected to AP."));
USB.print(F(" Time(ms):"));
USB.println(millis()-previous);
delay(500);
// on setRTCfromWiFi succes
if (!WIFI.setRTCfromWiFi())
{
// get Time from RTC
USB.print(F("Time [Day of week, YY/MM/DD, hh:mm:ss]: "));
USB.print(RTC.getTime());
USB.printf(" GMT +%d\n", RTC.getGMT() );
}
else
{
USB.println("Couldn't set RTC time");
}
// Leave Access Point
WIFI.leave();
}
else
{
USB.print(F("ERROR Connecting to AP."));
USB.print(F(" Time(ms):"));
USB.println(millis()-previous);
}
// Switch WiFi OFF
WIFI.OFF();
// delay 2 seconds
delay(2000);
}
Output
H#
Wifi switched ON
Connected to AP. Time(ms):5511
Time [Day of week, YY/MM/DD, hh:mm:ss]: Tue, 15/06/09, 10:09:35 GMT +1
Wifi switched ON
Connected to AP. Time(ms):1218
Time [Day of week, YY/MM/DD, hh:mm:ss]: Tue, 15/06/09, 10:09:51 GMT +1
Wifi switched ON
Connected to AP. Time(ms):811
Time [Day of week, YY/MM/DD, hh:mm:ss]: Tue, 15/06/09, 10:10:07 GMT +1
...