EP-0105

IoT Node(A)

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

Gallery

Documentations

• A9G Module Spicification: File:A9g product specification.pdf
• A9G Module AT Command Manual: File:A9G AT COMMAND manual.pdf
• A9G gprs series module at instruction set v1.0 File:A9G gprs series module at instruction set v1.0.pdf
• GPRS C SDK: File:GPRS C SDK-master.zip

Register Map

• A9G module will offer two serial port.

Serial Port	Module name
/dev/ttySC0	GPRS
/dev/ttySC1	GPS

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.

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...")
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

Keywords

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