EP-0105: Difference between revisions

From 52Pi Wiki
Jump to navigation Jump to search
Line 283: Line 283:
</pre>
</pre>


===GPRS Connect with PPPd===
===GPRS Connect with PPPd(Raspberry Pi)===


A) First, replace the /boot/overlays/sc16is752-i2c.dtbo and make sure I2C is working properly.
A) First, replace the /boot/overlays/sc16is752-i2c.dtbo and make sure I2C is working properly.

Revision as of 22:30, 2 July 2019

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


Configuring I2C(Raspberry Pi)

Run sudo raspi-config and follow the prompts to install i2c support for the ARM core and linux kernel
Go to Interfacing Options

Raspi-config-1.png

then I2C

Raspi-config-2.png

Enable!

Raspi-config-3.png

Done!

Raspi-config-4.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

Replace /boot/overlays/sc16is752-i2c.dtbo(Raspberry Pi)

Replace /boot/overlays/sc16is752-i2c.dtbo file with this file: File:Sc16is752-i2c.zip

Replace dtbo sc16is752.png

Modify /boot/config.txt file and add following parameter:

 dtoverlay=sc16is752-i2c 

Add dt sc16.png

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 
  • Turn on the I2C interface

Open a terminal and Run sudo raspi-config
Use the down arrow to select 5 Interfacing Options.
Arrow down to P5 I2C .
Select yes when it asks you to enable I2C.
Also select yes if it asks about automatically loading the kernel module.
Use the right arrow to select the <Finish> button.

  • Open a terminal and typing:

sudo raspi-config

Navigate to interface options and then select i2c and enable it.
Enablei2c.jpg
Enablei2c2.jpg
Enablei2c3.jpg
Enablei2c4.jpg
Enablei2c5.jpg
Enablei2c6.jpg
  • 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...")
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("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

GPRS Connect with PPPd(Raspberry Pi)

A) First, replace the /boot/overlays/sc16is752-i2c.dtbo and make sure I2C is working properly.

  1. Replace sc16is752-i2c.dtbo [[1]]
  2. Configuring I2C[[2]]

B)Enter command i2cset -y 1 0x16 0x23 0x40 to reset the GPRS module.

C)Enter command sudo apt install ppp to install ppp tools.

Pppd-tools-apt.png

D)Copy /etc/ppp/peers/provider to /etc/ppp/peers/gprs E)Modify /etc/ppp/peers/gprs

  1. Line 10 : Please consult your service provider for the user (Example:cmnet).
  2. Line 15 : Please consult your service provider for the apn (Example:cmnet).
  3. Line 18 - Line 24:Recommended setting

Gprs-set.png

F)Modify /etc/chatscripts/gprs (Change Line 34 to Line 35)

Gprs ppp.png

G)Enter command sudo pppd call gprs to dial up.

Get-ip-ppp.png

H)Check your ppp config from your ISP.

Ppp-test.png

I)Enter command ping -I ppp0 8.8.8.8 test your network (If Internet available)

Ping-google.png

How to use Lora module

  • Principle:

<pre. The transmitting device performs data transfermation role by transmitting data to each of the register addresses from 0x01 to 0x10. The receiving device acquires the transmitted data by reading data from each register of 0x11~0x21.

  • Data sending example
 Create a file named lora_sender.py and then copy and paste following code: 
#!/usr/bin/env python3
import time
import smbus
import os
import sys

bus = smbus.SMBus(1)    

try:
    print("Initialize LORA transmitter open")
    bus.write_byte_data(0x16,0x23,0x01)    # 0x01 means "send user data" 
    # specify the data that you want to send. 
    # for example, if you want to send 4 data to receiver, you put them in a list.
    # although you can input 10 set of data due to you have 10 register to use.
    data_list = [170,85,165,90] 
    
    # define the register list that you want to use.
    register_list = [0x01,0x02,0x03,0x04] 
   
    # write data to register and then the data will be send out. 
    for index in range(0, len(data_list)):
        bus.write_byte_data(0x16,register_list[index],data_list[index])
        print("LORA send data to %d register %d data" %(register_list[index], data_list[index])
        time.sleep(1)    
except KeyboardInterrupt:
    sys.exit()
finally:
    print("Quit the sending data program")
  • Save it and run it:
chmod +x lora_sender.py
python3 lora_sender.py
  • Receiving Data Example:
 Create a file named "lora_receiver.py" and then copy and paste following code:
#!/usr/bin/env python3
import time
import smbus
import os
import sys

bus = smbus.SMBus(1)    

try:
    print("Initialize LORA transmitter open")
    bus.write_byte_data(0x16,0x23,0x02)    # 0x02 means "read user data" 
    # create a list to receive data from sender.
    resv_data = [] 
    
    # define the register list that you want to read from. 
    register_list = [0x11,0x12,0x13,0x14]
    
    #Read each register's data and append to resv_data list.
    for index in range(0,len(register_list)):
        resv_data.append(bus.read_byte_data(0x16, register_list[index])

    print("Received data:")
    print(resv_data)
    time.sleep(1)    
except KeyboardInterrupt:
    sys.exit()
finally:
    print("Quit the receiving data program.")
  • Save it and run it:
chmod +x lora_receiver.py
python3 lora_receiver.py

How to build your own project with 4 channel Relay board

  • Assemble Iot-Node(A) to Raspberry pi 3B/3B+/3A+/4B/Zero/Zero w.
  • Assemble another Iot-Node(A) to another Raspberry pi 3B/3B+/3A+/4B/Zero/Zero w.
  • Assemble 4 channel Relay board to one of them, and make sure you have already enabled i2c function on both of them.
  • Download demo code from github:
git clone https://github.com/geeekpi/dockerpi.git

and follow the readme to run the demo code.

Package Include

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

FAQ

  • Q: May i hotplug this module when it is running?
 A: We sugguest that you turn off the raspberry pi and then plug the module.

Keywords

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