Seeed Wio Extension RTC User manual
Wio Extension RTC
The Wio Extension - RTC is an extension board for Wio LTE, it can provide the Real-
Time Clock function via the I2C port. This board is based on NXP PCF8523 chip, which
can provide year, month, day, weekday, hours, minutes, and seconds information.
This board is powered by Micro-USB port, communicate with the Wio LTE via I2C port,
and we also provide a USB power output which can be turned off/on by a on-board
switch, so that you can use the Wio Extension - RTC board to power the Wio LTE.
When the power supply to Wio boards ( Like the following picture), the standby current
of whole system is less than 1 uA.
Feature
Extensibility
Able to supply Wio boards with 3.3 voltage.
Hardware Overview
Platforms Supported
Arduino RaspberryPiBeagleBoneWioLinkItONE
Getting Started
Play With Arduino
Materials required
WioLTEBoards Wio‐Extension‐RTCGrove‐BuzzerGrove‐RedLED
Since Wio Extension - RTC just controlling USB power supply set from I2C, you can use
this board to manage the power supply almost for every MCU boards powering from
USB.
Note
1Please plug the USB cable gently, otherwise you may damage the port. Please use
the USB cable with 4 wires inside, the 2 wires cable can't transfer data. If you are not
sure about the wire you have, you can click here to buy
2Each Grove module comes with a Grove cable when you buy. In case you lose the
Grove cable, you can click here to buy.
Hardware
Step 1. Connect the Wio-Extension-RTC to the I2C port of the Wio LTE Boards.
Step 2. Connect Wio LTE Boards.to PC via a USB cable.
Step 3. Connect Grove - Buzzer or Grove - Red LED to D38 of Wio LTE.
Software
Attention
If this is the first time you work with Arduino, we strongly recommend you to see Getting
Started with Arduinobefore the start.The driver of this board is rely on the head file
of
Seeed STM32F4 Board(JP mirror) by Seeed K.K.
, so whether you have installed your wio
board with the tutorial of Getting Started with Arduino, you need to do the following step.
Step 1 Install library Open your Arudino IDE, click on File > Preferences, and copy
below url to Additional Boards Manager URLs.
http://www.seeed.co.jp/package_SeeedJP_index.json
Click on Toos > Board > Board Manager, and enter
Wio
to the text box.
Click
Seeed STM32F4 Board(JP mirror) by Seeed K.K.
then an Install button appear,
click on it to finish the step, this process takes about 5 minutes to half an hour, which
depend on the speed of your network. Click on Tools > Manage Libraries, and
enter
Wio
to the text box.
Click
Wio LTE for Arduino by Seeed K.K.
then an Install button appear, click on it to
finish the step.
Unzip the sample sketch, and open
wiortc-sample.ino
with Arduino IDE.
Step2 Download the code
1. Press and hold BOOT button at back side of the Wio LTE and plug the USB to PC.
2. We will see STM BOOTLARDER in device manager.
3. Select Tools→Boards→Wio_Tracker_LTE.
4. Select Sketch→Upload to upload the code to Wio_LTE.
5. Press RST button to enable the COM port. Tips
When you download most Arduino bords, you need to choose a right COM port, but
for this board, you must keep the COM configuration to be blank.
1. Use Serial monitor to print the serial message.
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#include <WioLTEforArduino.h>
#include "WioRTC.h"
////////////////////////////////////////////////////////////////////////////
////
// Defines
#define BOOT_INTERVAL (30) // [sec.]
////////////////////////////////////////////////////////////////////////////
////
// Global variables
WioLTE Wio;
WioRTC RTC;
////////////////////////////////////////////////////////////////////////////
////
// setup and loop
void setup()
{
delay(200);
SerialUSB.begin(115200);
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SerialUSB.println("");
SerialUSB.println("--- START ---------------------------------------------
------");
////////////////////////////////////////
// Low-level initialize
SerialUSB.println("### I/O Initialize.");
Wio.Init();
SerialUSB.println("### Power supply ON.");
Wio.PowerSupplyGrove(true);
delay(500);
////////////////////////////////////////
// Device initialize
SerialUSB.println("### Device initialize.");
Wire.begin();
RTC.begin();
////////////////////////////////////////
// Completed
SerialUSB.println("### Completed.");
}
void loop()
{
uint8_t val;
RTC.EepromRead(0, &val, sizeof(val));
SerialUSB.print("EEPROM value is ");
SerialUSB.println(val);
val++;
RTC.EepromWrite(0, &val, sizeof(val));
SerialUSB.println("Beep.");
pinMode(WIO_D38, OUTPUT);
digitalWrite(WIO_D38, HIGH);
delay(200);
digitalWrite(WIO_D38, LOW);
SerialUSB.println("Shutdown.");
RTC.SetWakeupPeriod(BOOT_INTERVAL);
RTC.Shutdown();
while (1) {}
}
////////////////////////////////////////////////////////////////////////////
////
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After you download the sample sketch, Wio Extension - RTC set to shut down the
system for 30 sec with
1RTC.SetWakeupPeriod(BOOT_INTERVAL);
and then set to shut down the whole system on
1RTC.Shutdown();
http://wiki.seeedstudio.com/Wio‐Extension‐RTC//5‐16‐19
This manual suits for next models
1
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