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Don't use SIM900,SIM908,SIM800,SIM808 modules in USA (2G sunset)
http://www.raviyp.com/embedded/208-don-t-use-sim900-sim908-sim800-sim808-modules-in-usa-2g-sunset

Right now SIM900 and SIM800 GSM/GPRS modules might seem like the perfect choice for using in your upcoming IOT product design, as they are the most widely used GSM/GPRS modules across the world as of now. But they are not really a good choice for new products which are going to be used in U.S.A
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http://www.raviyp.com/embedded/204-sim908-gps-active-antenna-unable-to-acquire-fix-solution
I have been working with SIM908 GSM/GPRS/GPS combo module for some time and faced problems with the SIM908 GPS engine not being able to acquire location fix from the satellites.

The circuit i designed was for a vehicle tracking system product. We chose SIM908 because it was the most economical option which suited the requirement.

The idea was to use SIM908 to send data to server through TCP at set intervals to server.
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http://www.raviyp.com/embedded/194-sim900-gprs-http-at-commands
This article is about showing you how to get the contents of a web page from and upload a file to a web server using HTTP GET and POST methods. SIM900 GSM module provides a set of AT commands which can be used for getting the contents of a web page and posting variables and files to the web server through a GPRS connection
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868 MHz frequency is not license free in India - LoRa in India

http://www.raviyp.com/embedded/207-868-mhz-frequency-is-not-license-free-in-india-lora-in-india
If you are planning on a wireless project which might run on the 868 MHz frequency band in India, then its better to be clear if you are allowed to use that frequency for transmissions instead of facing problems from government organizations in the future
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http://www.raviyp.com/embedded/205-sim808-gps-active-antenna-unable-to-acquire-fix-solution
I again forgot and faced problems with SIM808 GSM/GPRS/GPS module GPS engine not being able to acquire location fix from the satellites.

This time the circuit i designed was an add on for a Alcohol sensor+GPS vehicle tracking system.

We were sending and logging device event data to a server along with the vehicle location details.
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http://www.raviyp.com/embedded/197-sim900-gprs-email-at-commands
This article is about showing you how to send a email using SIM900 GSM/GPRS module. SIM900 GSM module provides a set of AT commands which can be used for sending email via SMTP protocol to the web server through a GPRS connection. 
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http://www.raviyp.com/embedded/193-sim900-ftp-commands
This article is about showing you how to upload a file and download a file form a web server using FTP protocol. SIM900 GSM module provides a set of AT commands which can be used for creating, uploading and downloading a file through a GPRS connection.
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Anything related to Embedded systems, Microcontroller Hardware/Software development, Debugging, issues
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Embedded World is a blog page owned by Ravi Pujar
an Embedded Design engineer and Founder of Valetron Systems Pvt Ltd, Dharwad, Karnataka. The posts on this page will be about updates from the blog EMBEDDED WORLD
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