Tag Archives: GSM

8V97051 Low Power Wideband Fractional RF Synthesizer

This design features a low power wideband RF synthesizer that is used in GSM receiver cards. It has dual differential and open drain outputs with frequency range of 34.375MHz to 4400MHz(in continuous range). The logic compatibility is 1.8V while the system is running on a single 3.3V supply. It has -143dBc/Hz Phase Noise (PN) performance at 1MHz Offset for every 1.1GHz output. It is also capable of mute function at RF_OUT that is accessible via mute pin or SPI command. It is low power with only 380mW average power consumption while RF_OUTB is not in used.

The design is comprised of 3 major parts. The first part consists of IDT8V97051NLGi wideband RF synthesizer/PLL supports the output frequencies with Voltage Controlled Oscillator (VCO). The temperature compensated crystal oscillator close to the RF input helps in the precision of signal while the other parts are filters that are used in various purposes like minimizing undesired noise. The second part consists of the USB 2.0 high speed to UART/FIFO IC that is used for system interface while the I2C-bus to SPI bridge IC controls the sequences, protocol, and timing of the signal. The last part is power supply management of the system in which it is provided with RC filters in every line to ensure minimal noise are included in the supply.

The design is applicable in multi-carrier, multi-mode Frequency Division Duplexing (FDD) and Time Division Duplexing (TDD) base station radio card. It optimizes multi-service base stations during its service as a local oscillator that generates a large variety of frequencies to mixers while maintaining excellent PN.

8V97051 Low Power Wideband Fractional RF Synthesizer – [Link]



RePhone kit: World’s first open source and modular phone


Seeed Studio has announced that RePhone, an open source and modular phone kit:

With Rephone you can:
1.Create your own phone in minutes with the slim MODULES, accessible SOFTWARE, and customizable Phone Enclosures.
2.Hack anything around you, giving inanimate objects the power of cellular communication. Have a conversation with your pets, plants, toys, motorcycle helmets, robots, or drones through RePhone’s GSM and 3G functions.

RePhone is a set of tools and components that allows everyone including students, teachers, makers, hackers, geeks, artists, developers and engineers rethink, remix, redesign and remake the phone.
RePhone comes in three kits RePhone Core Module GSM + BLE, RePhone Core Module 3G and RePhone kit Create.

RePhone kit: World’s first open source and modular phone – [Link]

SIM900 USB Communication using MCP2200


Jesus Echavarria writes:

Hi all! Here’s the new project where I’m working a couple of days. Since I develop the SIM900 module and test it, I don’t work with it. Also, I’ve got at home some samples of the MCP2200 USB bridge that I want to test it. So make an USB interface for this board was the perfect idea! This allows to use the SIM900 board with a PC, Raspberry or similar, with the plus of no need external power supply or control signals. Just plug the USB cable on the board and start communicating with the world!

SIM900 USB Communication using MCP2200 – [Link]

Wireless Electronic Notice Board using GSM

This project demonstrates how to design a wireless electronic notice board using SST89E516RD-40-C-PIE microcontroller. The notice boards are important in public places like railway stations, parks and airports. Presently almost all electronic notice boards are designed using wired system. One of the drawbacks of the design is the system’s flexibility in terms of placement. The aim of this project is to develop a wireless notice board that can be installed in any public areas and will display the latest information sent from the user’s mobile.

The above circuit consists of Microchip Technology’s SST89E516RD-40-C-PIE microcontroller, GSM module, level converter and 16×2 LCD. The LCD is connected to P1.0 and it is used to display message. The GSM module is connected to the SST89E516RD-40-C-PIE microcontroller through the MAX232 IC. Only four data lines are required to display the data, which are connected to P1.4, P1.5, P1.6 and P1.7 respectively. In order to communicate with GSM, some AT commands are sent through the serial connection (UART Protocol). The module requires 9600-baud rate. The GSM modem is duly interfaced through level shifter IC for establishing RS232 communication protocol to the microcontroller. The message received is sent to the microcontroller that further displays it on electronic notice board, which is equipped with a LCD display. It is interfaced to a microcontroller from 8051 family duly powered by a regulated power supply.

This GSM based e-notice board has various applications used in several domains including banks, stock exchanges, traffic control, public advertisements, and educational sectors. Further development to this project can be done by providing message storage facility by non-volatile memory i.e. EEPROM attached to the microcontroller for retrieval of old messages if required. It can also be expanded to a bigger LCD screen.

Wireless Electronic Notice Board using GSM  – [Link]

Nokia phone Arduino shield


Anyone awake in the early 2000’s knows the familiar shape of those candy bar style mobile phones. In the Shenzhen phone markets we see tons of them. Literally, there are tons of these phone passing through the markets every day. Some are resold while others are disassembled for parts and recycled. This is where all those cheap Nokia 3310/5110 LCD shields come from. It’s great to see so much reuse and recycling.

Having all these cheap LCDs is nice, but most of the interesting and useful parts are wasted. We saw a fantastic opportunity to save a heap of phones from the recycling bin and save people a pocket full of money. We can make a positive impact on the environment if we reuse some of these phones that we are literally tripping over in the streets. Let’s make an Arduino to GSM network bridge for just a few dollars.

Nokia phone Arduino shield – [Link]

GPS Tracker for Alzheimer’s Patients


by LoganP2 @ instructables.com:

The GPS tracking device is composed of a microcontroller, GPS module, cell module, and batteries all housed in a 3D printed case. The microcontroller is programmed to communicate with both the cell module and GPS module. When the GPS module is not within a user-specified boundary, the device will send a text message alert. We made a device that can track people suffering from Alzheimer’s and Dementia could greatly benefit the quality of life of both that person suffering and the caretaker.

GPS Tracker for Alzheimer’s Patients – [Link]

GSM based SMS Alert Fire Alarm System using Arduino


by jojo @ circuitstoday.com

Recently we have learned how to interface GSM Module with Arduino and send/receive SMS using GSM module. Interfacing any device with a micro controller is the first step to building a useful system or project with that particular device. In this tutorial, we are going to build a very interesting project – a Fire Alarm System which will send SMS to a set of Mobile Numbers when fire occurs in a particular location. We have seen many typical Fire Alarm projects which will alert with a siren or an automatic shutdown mechanism. This fire alarm project make use of modern communication technologies to deal with emergencies.

GSM based SMS Alert Fire Alarm System using Arduino – [Link]

How to Interface GSM Module and Arduino-Send and Receive SMS


by jojo @ circuitstoday.com:

In this article, we are going to see how to interface GSM Module to Arduino. There are different kinds of GSM modules available in market. We are using the most popular module SIM900 and Arduino Uno for this tutorial. Interfacing a GSM module to Arduino is pretty simple. You only need to make 3 connections between the module and arduino. So lets get to business!

How to Interface GSM Module and Arduino-Send and Receive SMS – [Link]

New version of the GSM/GPRS module Quectel M95 is here


Thanks to the enhanced functionality of the M95 FA module, this new version of the favorite GSM/GPRS module can be used for even more applications.

Quectel M95 communication module is already well-known among designers and we can say, that also very favorite. Its producer also knows this fact, that´s why Quectel decided to come to the market not with a new type, which might have other package, functionality,…. but a new version of M95, marked as M95FA. M95 FA maintains compatibility with the previous versions M95A (R1.0) and M95 EB, plus it naturally adds something new …Similarly like M95EB , even the „FA“ supports eCall and DSSS (Dual SIM single standby), but also supports digital audio, secure data transfer thanks to the SSL and other. M95 FA is based on the latest MTK chipset, ensuring long lifetime and availability. M95 gained various international certificates and meets all requirements in the GSM/GPRS bands.

To make the development easier, M95 FA is also available on the so called adaptor board – M95FA-TEA-03-STD,usable with the M10EVBKIT.
Detailed information can be found in the Quectel M95 flyer, Quectel 2014 catalogue and upon request we´ll send you complete detailed SW and HW documentation.

New version of the GSM/GPRS module Quectel M95 is here – [Link]

How to send and receive SMS messages with Arduino

Arduino Tutorial: GSM/GPRS SHIELD (SIM900) SMS Send and Receive Tutorial on Arduino Uno

In this video we are going to see, how easy it is to send and receive SMS messages using the Arduino GSM/GPRS shield (with SIM900 chip) from Tinysine. The shield is capable of sending and receiving SMS messages as well as making and receiving phone calls. It can also connect to the Internet using the GPRS network. But we will take a look at this later on in another video.

In this video, we connect to the GSM network of COSMOTE in Greece and we send an SMS message to a cell phone. Then we reply to Arduino and read the message in the Serial Monitor in the computer.

How to send and receive SMS messages with Arduino – [Link]