EP-0105

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IoT Node(A)

IoTnodeA1.jpg

Descriptions

Iot Node(A) is one of Docker Pi series module.
It contains GSM module, GPS module and Lora module onboard.

Features

  • Easy to Use
  • Support I2C protocol communication
  • High Quality A9G module
  • High Quality Lora module
  • Low Power Consumption
  • Long Range Transmission
  • Working temperature: 0°C ~ 65°C
  • LORA antenna gain: 2db
  • GPS antenna gain: 1.5db
  • GSM antenna gain: 2db
  • Supply voltage: 5V + 3V dual power supply
  • Pure I2C communication, does not occupy other IO, leads to the GPIO pin.

Specifications

GPRS section

  • 1. Low power consumption, standby sleep current <1mA
  • 2. Support GSM/GPRS four frequency bands, including 850, 900, 1800, 1900MHZ;
  • 3. GPRS Class 10;
  • 4. Support GPRS data service, maximum data rate, download 85.6Kbps, upload 42.8Kbps;
  • 5. Support standard GSM07.07, 07.05 AT commands, and access the serial port through I2C interface conversion.
  • 6. AT commands support standard AT and TCP/IP command ports

GPS section

  • 1. Support BDS/GPS joint positioning
  • 2. Support A-GPS, A-BDS
  • 3. Support standard SIM card

LORA section

  • 1. City working conditions: transmission distance of 500 meters (RF parameters: 0x50)
    In all cases： the minimum guaranteed 300 meters transmission.
  • 2. Support FSK, GFSK, MSK, GMSK, LoRaTM and OOK modulation methods
  • 3. Ultra-high receiver sensitivity as low as -141 dBm
  • 4. Support preamble detection
  • 5. Packet engine with CRC, up to 256 bytes
  • 6. LORA transceiver indicator

Mechanical Drawings

Lora mechanical.png


Gallery

IoTnodeA1.jpg
IoTnodeA2.jpg
IoTnodeA3.jpg
IoTnodeA4.jpg
IoTnodeA5.jpg
IoTnodeA6.jpg

Documentations

Technical Details

A9G module

  • Serial port : A9G module offers two serial port.
Serial Port Module name
/dev/ttySC0 GPRS
/dev/ttySC1 GPS

Register Map

  • Lora instruction section:

1) The 0x22 register is used to configure the parameters of the Lara. 

  After the register is written, it needs to write 1 at the corresponding position of the 0×23 register to make the setting take effect.

2) The first 16 bytes of the module are used to store the data specific address 0x01-0x10 that the user wants to send, and the 16 byte space from 0x11-0x21 is used to store the data received by the user.

Register Address 0x22
Name - SpreadingFactor SignalBandwidth ErrorCoding
Default Value 0 1 0 1 1 0 1 1
Description Reserved Band range 7-12 Spread spectrum bandwidth 6-9 Effective data ratio 1-4
Register Address 0x23
Default Value 0 0 0 0 0 0 0 0
Description Write the setting parameters in the 0x22 address to Lora Reset A9G module Reserved Reserved Reserved Reserved Receive data set Send user data
Register address Function
0x23 register write reference
0X01 Send user data
0X02 Receive data set
0X40 Reset A9G
0X80 Set the Lora register

How to use

How to assemble

  • Mount the Iot Node(A) board to Raspberry Pi
  • Hookup GPS antana and Lora antana to IPX port.
  • Screws the GPRS antana on the SMA port.
IoTnodeA8.jpg
IoTnodeA7.jpg

How to configure

  • FLash TF card with the latest raspbian image.
  • Replace /boot/overlays/sc16is752-i2c.dtbo file with this file: File:Sc16is752-i2c.zip

NOTE: Please unzip it after donwloading.

  • Modify /boot/config.txt file and add following parameter:
 dtoverlay=sc16is752-i2c
  • Reboot Raspberry Pi
  • Login Raspberry pi and make sure connect to internet, open a terminal and typing:
sudo apt-get update
sudo apt-get -y install gpsd gpsd-clients python-gps
  • Modify "/etc/default/gpsd" file and add following parameters:
DEVICES="/dev/ttySC1"
GPSD_OPTIONS='-F /var/run/gpsd.sock'

How to use GPS module

  • NOTE: GPS module is OUTDOOR module, please test it outside.
  • Open a terminal and typing:
sudo systemctl restart gpsd.socket 
sudo cgps -s
  • Python Programming:
#!/usr/bin/env python3
import serial
import smbus
from gps import *
import os

# Restart gpsd service.
os.system("sudo systemctl restart gpsd.socket")
# Open serial port  
ser = serial.Serial('/dev/ttySC0', 115200)

if ser.isOpen == False:
    ser.open()
try:
    print("Turn on GPS switch")
    ser.write(str.encode("AT+GPS=1\r")) 
    time.sleep(1)              
    os.system("sudo cgps -s")                
except KeyboardInterrupt:
    ser.flushInput()
    ser.close()
  • Save it and execute it:
chmod +x mygps.py 
./mygps.py

How to use GPRS module

  • Insert the SIM card(It may need you purchase from ISP vendor).
  • Create a file named gprs.py
  • Paste follow code into the file and save it.
#!/usr/bin/env python3
import serial
import time
import smbus
import operator
import os

print("Waiting for initializing...")
time.sleep(2)

bus = smbus.SMBus(1)    

ser = serial.Serial('/dev/ttySC0', 115200)

if ser.isOpen == False:
    ser.open()
try:
    print('-'*60)
    print("Initializing A9G GPRS module.")
    print("GSM connecting...")
    time.sleep(3)
    i = 0
    while True:
        ser.write(str.encode("AT+CCID\r"))
        size = ser.inWaiting() 
        if size != 0:
            ticks = time.time()
            response = ser.read(size)
            ccid = str(response,encoding="utf-8")
            if(ccid.find("89860") != -1):
                ccid_result_tmp1 = ccid.splitlines()
                ccid_result = ccid_result_tmp1[2].split(": ")
                if len(ccid_result) > 1:
                    print("SIM card OK, Network access testing is normal. Please check whether the card serial number is the same. number:" + ccid_result[1]);
                    time.sleep(3)
                    print('-'*60)
            else:
                i = i + 1
                print("Waiting network, If the time is too long, it may be a malfunction, or the SIM card is bad.:" + str(i))
                ser.flushInput() 
                time.sleep(1)    
except KeyboardInterrupt:
    ser.close()
  • Add executable rights and run:
chmod +x gprs.py 
./gprs.py

How to use Lora module

  • Create a file named: lora_test.py
  • Copy and paste following code into the file and save it.
#!/usr/bin/env python3
import serial
import time
import smbus
import operator
from gps import *
import os

print("Wait for the microcontroller to complete initialization...")
bus.write_byte_data(0x16,0x23,0x40)
time.sleep(2)

bus = smbus.SMBus(1)    

ser = serial.Serial('/dev/ttySC0', 115200)

if ser.isOpen == False:
    ser.open()
try:
    print('-'*60)
    print("Initialize A9G, it takes some time while keeping the LORA transmitter open, testing the LORA module.")
    bus.write_byte_data(0x16,0x23,0x40)
    
    print("LORA test preparation in progress...")

    bus.write_byte_data(0x16,0x11,0x00)
    bus.write_byte_data(0x16,0x12,0x00)
    bus.write_byte_data(0x16,0x13,0x00)
    bus.write_byte_data(0x16,0x14,0x00)

    print("Receiving data check...")

    time.sleep(2)

    list_real = []
    list_cmp = [170,85,165,90]
    list_real.append(bus.read_byte_data(0x16,0x11))
    list_real.append(bus.read_byte_data(0x16,0x12))
    list_real.append(bus.read_byte_data(0x16,0x13))
    list_real.append(bus.read_byte_data(0x16,0x14))
    if(operator.eq(list_real,list_cmp) == False):
        print("LORA failure or Data transport failure, please check the antana and receiver")
        print('-'*60)
    else:
        print("LORA Test ok")
        print('-'*60)
        time.sleep(1)    
except KeyboardInterrupt:
    ser.close()
  • Save it and run it:
chmod +x lora_test.py
./lora_test.py

Package Include

  • 1 x IoT Node(A) Board
  • 4 x M2.5*11mm Copper stick
  • 4 x M2.5 Nuts
  • 1 x Instructions

FAQ

Keywords

  • IoT, lora, GPS, GPRS, GSM, antana, Raspberry pi 3B, Node, radio devices
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