Difference between revisions of "Pico-SIM868-GSM/GPRS/GNSS"

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Revision as of 07:01, 13 August 2021

Pico-SIM868-GSM/GPRS/GNSS
Pico-SIM868-GSM/GPRS/GNSS

GSM, GPRS, GNSS, and Bluetooth module designed for Raspberry Pi Pico
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Overview

The Pico-SIM868-GSM/GPRS/GNSS is a GSM, GPRS, GNSS, and Bluetooth module designed for Raspberry Pi Pico. This small size and low power module will easily enable your Raspberry Pi Pico multiple functions including making phone calls, sending SMS, 2G communication, global positioning, as well as Bluetooth transmission.

Feature

  • Standard Raspberry Pi Pico header, supports Raspberry Pi Pico series boards
  • UART communication, serial AT commands control
  • Supports SMS, phone call, GPRS, DTMF, HTTP, FTP, MMS, email, etc.
  • Bluetooth3.0 support allows Bluetooth data transfer
  • RTC real-time clock, with rechargeable Li-po battery
  • Integrates 3.7V Li-po battery connector and recharge circuit, allows being powered from external rechargeable Li-po battery, or recharge it in turn
  • Onboard microphone, together with speaker header, can be used to make phone calls
  • 2x LED indicators, for monitoring the module operating status
  • Onboard nano-SIM card slot supports 2G/4G SIM card *

* Depending on the local network service provider

Specification

Product type SIM868 SIM7080G SIM7020E
Working frequency
NB-IoT N/A B1/B2/B3/B4/B5/B8/B12/
B13/B18/B19/B20/B25/B26
/B28/B66/B71/B85
SIM7020C:
LTE-FDD:B1/B3/B5/B8
SIM7020E:
LTE-FDD:B1/B3/B5/B8/B20/B28
Cat-M N/A B1/B2/B3/B4/B5/B8/B12/B13
/B14/B18/B19/B20/B25/
B26/B27/B28/B66/B85
N/A
2G GSM 850/EGSM 900/DCS
1800/PCS 1900 MHz
N/A N/A
GNSS GPS, GLONASS, BeiDou GPS, GLONASS, BeiDou, Galileo N/A
Available Area Most of Counties and areas Global SIM7020C:China
SIM7020E:Europe/Africa/Australia/Southeast Asia
Data transmit
NB-IoT(Kbps) - 136(DL)/150(UL) 26.15(DL)/62.5(UL)
Cat-M(Kbps) - 589(DL)/1119(UL) -
2G(Kbps) 85.6(DL)/85.6(UL) - -
Other specification
Communication protocol TCP/UDP/HTTP/SSL/FTP
/POP3/SMTP/MQTT, etc.
TCP/UDP/HTTP/HTTPS/TLS/DTLS/PING/LWM2M/COAP/MQTT, etc.
Power type External Li-po battery OR Raspberry Pi Pico USB port
Li-po battery 3.7V ~ 4.2V
Logic level 3.3V
Module standalone current Idle mode:12mA Idle mode:10mA Idle mode:5.6mA
Sleep mode:0.65mA Sleep mode:1.2mA Sleep mode:0.4mA
Backup Mode:8uA PSM Mode:3.2uA PSM Mode:3.4uA
Audio input/output onboard microphone,with speaker header N/A
Indicator NET:network indicator
Charge:recharge indicator
Switch Li-po battery and USB power supply switch Li-po battery power supply switch
SIM card 2G SIM card (1.8V / 3V) NB-IoT / Cat-M card (1.8V ONLY) NB card (1.8V / 3V)
Antenna connector LTE、GNSS、BT LTE、GNSS LTE
Dimensions 76.15 × 24.00mm 73.5 × 24.00mm

Pinout

Pico-SIM868-GSM-GPRS-GNSS-details-inter.jpg

Dimensions

Pico-SIM868-GSM-GPRS-GNSS-details-size.jpg

Hardware connection

  • Pico-SIM868-GSM/GPRS/GNSS x 1 (Pin header should be soldered)
  • Raspberry Pi Pico x 1
  • SIM card x 1 (Support supports 2G service)
  • Micro USB cable x 1

Pico-SIM868-GSM-GPRS-GNSS-5.jpg

Description:

If you need to use audio, you need to connect a speaker.
When in use, it is recommended to connect to the lithium battery: when there is no additional USB power supply, turn on the USB to turn off the lithium battery power supply, switch to VBAT to use the lithium battery power supply; When connected to USB power, the USB can be used to charge the lithium battery, power the Pico or write firmware and programs.

How to Use

Python Examples

Use in Windows

  • 1. Press and hold the BOOTSET button on the Pico board, connect the pico to the USB port of the computer through the Micro USB cable, and release the button after the computer recognizes a removable hard disk (RPI-RP2).
  • 2. Copy the pico_micropython_xxxxxxxx.uf2 file in the python directory to the recognized removable disk (RPI-RP2)
  • 3. Open Thonny IDE (note: use the latest version of Thonny, otherwise there is no Pico support package, the latest version under Windows is v3.3.3)
  • 4. Click Tools->Settings->Interpreter, select Pico and the corresponding port as shown in the figure

Pythonwin.png
5.File->Open->main.py, click to run, as shown below:
Main.png
This demo provides a simple program...

Use in Raspberry Pi environment

  • 1. The process of flashing the firmware is the same as that on Windows, you can choose to copy the pico_micropython_xxxxxxxx.uf2 file into pico on PC or Raspberry Pi.
  • 2. Open Thonny IDE on the Raspberry Pi Mountain (click the Raspberry logo -> Programming -> Thonny Python IDE ), you can check the version information in Help->About Thonny

To make sure your version has Pico support package, you can also click Tools -> Options... -> Interpreter to select MicroPython (Raspberry Pi Pico and ttyACM0 port
as the picture shows:
Inter.png
If your current Thonny version does not have the pico support package, enter the following command to update the Thonny IDE

sudo apt upgrade thonny

3. Click File->Open...->python/main.py to run the script


AT Test

This demo is mainly to facilitate the user can through the Thony software, directly test and verify the AT instruction transceiving module. The main program will start the module directly first and then check the network condition. After that, it will check the AT instructions entered by the user, send them to the module through the serial port, and then send the AT instructions back to the Pico serial port for printing.
For more details of AT commands, please check the manual:File:SIM800 Series_AT Command Manual_V1.11.pdf

Expected result

SIM868 AT Test.png

GPS Positioning

This example mainly demonstrates GPS positioning-related tests. To perform this example, the GPS antenna receiver must be placed outside (or in a window where the sky can be seen), and the GPS location cannot be obtained on rainy days。
For more details of AT commands, please check the manual:File:SIM868 Series_GNSS_Application Note_V1.02.pdf

Expected result

SIM868 PICO GPS.png

Taking calls

This example mainly demonstrates the phone call test. The module has an onboard microphone so that calls can be made directly to each other, and speakers are needed to hear the sound.
For more details of AT commands, please check the manual:File:SIM800 Series_AT Command Manual_V1.11.pdf

Expected result

SIM868 Phone call.png

TCP

In this example, the Raspberry Pico is connected to the Internet through NB-IoT, and the data is transmitted through TCP and the server. The server that obtains the public network IP needs to be used (this example uses the Alibaba Cloud server):

  • Description of the instructions
AT+CSQ   #Query the network signal quality, the first parameter is that the network signal quality ehich the maximum value is 31, the larger the value, the stronger the network signal
AT+CREG?  #Query the network registration status, where the second parameter is 1 or 5, it means the registration has been successful.
AT+CGATT?   #Query whether the module is attached to the GPRS network
AT+CSTT="CMNET    #set the APN according to the actual network, here we take CMNET as an example
AT+CIICR    #activates mobile scene
AT+CIFSR     #get local IP address
AT+CIPSTART="TCP","113.81.232.4",5000    #Establish a TCP/IP connection, as shown in the following figure
  • Download the Python demo: the TCP part of the code is as follows:
def tcp(sms_info="qixi"):
    send_at('AT+CIPSHUT', 'OK')
    send_at("AT+CSQ", "OK")
    send_at("AT+CREG?", "OK")
    send_at('AT+CGATT?', 'OK')
    send_at('AT+CSTT=\"CMNET\"', 'OK',5)
    send_at('AT+CIICR', 'OK')
    send_at('AT+CIFSR', 'OK')
    send_at('AT+CIPSTART=\"TCP\",\"120.79.2.0\",\"2317\"', 'OK')
    send_at('AT+CIPSEND', ">",5)
    uart.write(bytearray(sms_info))
    uart.write(bytearray(hexstr_to_str("1A")))

Expected result

  • Screenshot of Pico running on Thonny client:
PICO SIM868 TCP demo.png
  • Server receives data
PICO-SIM868 ALY NC -l.png

HTTP

Description

In this example, Raspberry Pico is connected to the Internet through NB-IoT and gets the weather information from the weather website through HTTP GET. Meanwhile, the temperature information on Pico is pushed to the server through HTTP POST.
Users can access the website and view the data uploaded in real-time. The software schematic is as follows:
Pico-SIM7020-HTTP-demo-diagram.png

Server Web Page Deployment

User http://pico.wiki/esp-chart.php as example.
Pico-SIM7020-HTTP-Demo-2.png
1、Server setup PHP, mysql and other environment, create database files. For example:

  • Database:example_esp_data
  • Password:your_password
  • user name:your_username
  • Create database table:
CREATE TABLE Sensor (
   id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
   value1 VARCHAR(10),
   value2 VARCHAR(10),
   value3 VARCHAR(10),
   reading_time TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP)

2、Example PHP files on the server are post-data.php and esp-chart.php

  • post-data.php: HTTP POST API that the SIM7080G module can call to POST data to the server.
  • esp-chart.php: The latest data uploaded by SIM7080G can be obtained from a web page accessed by the client and displayed in a graph.

Pico software setup

Download python example:Demo codes ,Part of the HTTP codes:

  • HTTP GET:
# HTTP GET TEST
def http_get():
   send_at('AT+HTTPINIT', 'OK')
   send_at('AT+HTTPPARA=\"CID\",1', 'OK')
   send_at('AT+HTTPPARA=\"URL\",\"'+http_get_server[0]+http_get_server[1]+'\"', 'OK')
   if send_at('AT+HTTPACTION=0', '200', 5000):
       uart.write(bytearray(b'AT+HTTPREAD\r\n'))
       rec_buff = wait_resp_info(8000)
       print("resp is :", rec_buff.decode())
   else:
       print("Get HTTP failed, please check and try again\n")
   send_at('AT+HTTPTERM', 'OK')
  • HTTP POST:
  1. HTTP POST TEST
def http_post():
   send_at('AT+HTTPINIT', 'OK')
   send_at('AT+HTTPPARA=\"CID\",1', 'OK')
   send_at('AT+HTTPPARA=\"URL\",\"'+http_post_server[0]+http_post_server[1]+'\"', 'OK')
   send_at('AT+HTTPPARA=\"CONTENT\",\"' + http_content_type + '\"', 'OK')
   if send_at('AT+HTTPDATA=62,8000', 'DOWNLOAD', 3000):
       uart.write(bytearray(http_post_tmp))
       utime.sleep(5)
       rec_buff = wait_resp_info()
       if 'OK' in rec_buff.decode():
           print("UART data is read!\n")
       if send_at('AT+HTTPACTION=1', '200', 8000):
           print("POST successfully!\n")
       else:
           print("POST failed\n")
       send_at('AT+HTTPTERM', 'OK')
   else:
       print("HTTP Post failed,please try again!\n")

Expected result



Results of web page access on the server:http://pico.wiki/esp-chart.php

SIM868 HTTP POST Result mark.png