Description

LoNet 808 is a mini board based on the latest SIM808 module, it offers 2G GSM and GPRS data along with GPS technology for satellite navigation. Also supports assisted-GPS (A-GPS) for indoor localisation.

The board features ultra-low power consumption, working current is low to 1mA when in sleep mode. That gives your the project incredibly long standby times. It uses a serial port communication, supports common 3GPP TS 27.007, 27.005 and SIMCOM enhanced AT commands.  Integrated with battery charging circuit, it is powered by 3.7V Lipo battery and can be charged by 5V micro-USB directly.

It comes with a mini GPS and GSM antenna, however a external Lipo battery is required.

Features

• Quad-band 850/900/1800/1900MHz
• GPRS multi-slot class12 connectivity: max. 85.6kbps(down-load/up-load)
• GPRS mobile station class B
• Controlled by AT Command (3GPP TS 27.007, 27.005 and SIMCOM enhanced AT Commands)
• Supports charging control for Li-Ion battery
• Supports Real Time Clock
• Supply voltage range 3.4V ~ 4.4V
• Integrated GPS/CNSS and supports A-GPS
• Supports 3.0V to 5.0V logic level
• Low power consumption, 1mA in sleep mode
• Supports GPS NMEA protocol
• Compact size 27mm x 46mm x 10mm
• Standard SIM Card

GPS  Features

• Receiver channels: 22 tracking / 66 acquisition
• Coarse/Acquisition code: GPS L1
• Tracking sensitivity: -165dBm
• Cold start time: 30s (typ.)
• Hot start time: 1s (typ.)
• Warm start time: 28s (typ.)
• Horizontal position accuracy: < 2.5m CEP
• Power consumption – Acquisition: 42mA
• Power consumption – Continuous tracking: 24mA
• Update rate: 5Hz

Related Products

• Li-ion Battery for power supply (http://www.seeedstudio.com/depot/Polymer-Lithium-Ion-Battery-2200mAh-37V-p-1709.html?cPath=1_3)
• DC/DC Voltage Regulator (http://www.seeedstudio.com/depot/Adjustable-DCDC-Power-Converter-125V-35V3A-p-1534.html?cPath=1_4)
• MicroUSB Cable (http://www.seeedstudio.com/depot/USB-To-Uart-5V3V3-p-1832.html)
• USB to UART Tool (http://www.seeedstudio.com/depot/USB-To-Uart-5V3V3-p-1832.html)
• Solder Panel (http://www.seeedstudio.com/depot/3W-Solar-Panel-138X160-p-954.html?cPath=1_118)

Hardware Interface

1. Power Button – this is the hard power switch for the module. When the module is power up, you can turn on or turn off the module by pressing the button for 2s.
2. Li-ion Battery – this is power supply for the module, input voltage is from 3.4V to 4.4V. It uses the JST-2.0mm connector, that make it convenient to connect to 3.7V Li-Po Battery.
3. MicroUSB – the charging interface for Li-Ion battery, of input voltage range from 5V to 7V.
4. GSM Antenna – this is an uFL GSM antenna connector, just connect it to a GSM antenna for receiving GSM signal.
5. GPS Antenna – this is an uFL GPS antenna connector. You can connect either passive or active GPS antenna to it. Active GPS antenna runs at 2.8V voltage.
6. Net Indicator – Red LED, it will tell the what status is about the module linking to network.
7. Status Indicator – Green LED, it will tell whether the module is on, light when the module is running.
8. Breakout Pin – see Pin Definitions for more details.
9. SIM – Card Holder – SIM card holder for standard SIM card
10. Power Supply Pin – used for power soldering and testing.

Pin Definitions

Pin Description

• PWR – this is soft power switch for the module, you can pull it to high level for at least 2s to power up or power down the module.
• RI – this pin will tell you whether the module is on and is there any calls and messages received. It will be pulled to high level when the module is on. And it will change to low for 120ms when a call or message is received.
• RST – this is reset pin for the module. By default it has a high pull-up. If you absolutely got the module in a bad space, you can pull it to low level for 100ms to perform a hard reset.
• RXD / TXD – Serial port, the module uses it to send and receive commands and data. TXD is output, and RXD is input. They can be connected to the 3.3V and 5V level.
• VIO – this is the reference logic level for serial port of the module, the input voltage depends on the logical level of the miccontroller you use. If you use a 5V miccontroller like Arduino, you should have it be 5V, and a 3V logic miccontroller you should set it to 3V.
• BAT – this pin is connected to Li-Ion battery pin, if you want to use only one Li-Ion battery as your power supply, you can use it to drive you microcontroller.
• DTR – this is wake up pin for module in sleep mode. By default it has a high pull-up, and you can set the module into sleep mode by AT command “AT+CSCLK=1”. In the meantime, the serial port will be disabled. To wake up the module and enable serial port, you can pull this pin to low level for about 50ms.

Indicator LEDs

Reference Circuit

Connect to Microcontroller

Connect to PC

Testing AT Command with Arduino

// this sketch is used for testing LoNet with Arduino

// Connect VIO to +5V
// Connect GND to Ground
// Connect RX (data into SIM800L) to Digital 11
// Connect TX (data out from SIM800L) to Digital 10

#include <SoftwareSerial.h>

SoftwareSerial mySerial(10, 11); // RX, TX

void setup()
{
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  mySerial.begin(9600);

}

void loop() // run over and over
{
  if (mySerial.available())
    Serial.write(mySerial.read());

  if (Serial.available())
  {
    while(Serial.available())
    {
      mySerial.write(Serial.read());
    }
    mySerial.println();
  }
}

Set Baud and Enable Charging Function

It is recommended to execute this process when first time to use the module. In the Serial Monitor columns of tables, input of AT commands are in back, module returns values are in orange.

Get location with GPS

Downloads

• LoNet_808_Schematic.pdf
• SIM800_ATCommand_Manual_V1.02.pdf
• SIM808_Hardware_Design_V1.00.pdf
• SIM808_GPS_Application_Note_V1.00.pdf
• Design file in Eagle Format

Related Resources

• GPRS_Shield library on gitHub
• Adafruit_FONA_Library

Support

Any question, document mistakes and suggestions , please contact deray@deegou.com.

We are not good at programming,  for basis questions we will try to help. But for complex problem, we may not be able to help.

To the end, thank you for your reading.