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2 Posts authored by: em_strings
em_strings

Embedded Systems

Posted by em_strings Aug 21, 2014

Hi ,

 

Embedded Strings inc  is a well-established company which specializes in the design, development, testing and manufacturing of complex embedded systems/Hardware. Our target markets are healthcare, telecommunication, aerospace and remote monitoring.


We have delivered customized hardware and software products that have application in wireless sensor networking, wireless tracking, digital signal processing and innovate medical monitoring devices.


We specialize in Field Programmable Gate Array design , we have developed our own VHDL/Verilog ip cores that have been integrated in high performance embedded systems, Nios SOC , ARM SOC and Digital Signal Processing.


We also have in-house resource to design multi-layer PCB using leading edge design tool Altium.


Please feel free to contact us in case you need to utilize any of the services that our company provides. We guarantee you complete security and confidentiality of information that you will share with us.

 

 

Thanking you ,


Ahmed Asim Ghouri

Embedded Strings inc

Website : www.emstrings.com

Email : support@emstrings.com

A Sensing node consists of methane gas sensor, carbon monoxide gas sensor, accelerometer sensor, temperature sensor and RS232 interface circuit with dual port RAM. Methane gas sensor and carbon monoxide gas sensors are placed on stationary node because its concentration is lighter than so it detects near the roof of the mine. The purpose of using accelerometer is to detect the earth quake type of activities. The Sensing node gets data from neighbouring Sensing node and sends its data to the next Sensing node.

 

The main computing microcontroller in this Hardware is CC430F6137. There are various gas sensors connected to Sensing node which will help monitor explosive and toxic gases within the mine environment. To monitor any structural change in the mine the Sensing node will analyze accelerometer data and to prevent any fire it will also monitor temperature inside the mine.

 

Block_dia.jpg

 

 

There are number of sensors connected to the microcontroller as shown in figure 5.The data of some of these sensors will be captured by built-in 12 bit ADC inside the CC430f6137.To extend the addressable memory an external SRAM has been connected via SPI interface whereas Accelerometer is connected via I2C bus.

 

Schematic Design

 

The complete schematic design of Sensing node comprises of 3 sheets which are connected with each other using off sheet connectors. The first sheet has a main computing unit of CC430 with CO sensor circuit, Methane gas sensor, Accelerometer and battery monitoring circuit. The second sheet has a RF matching circuit for CC430 RF Radio Core and the 3rd sheet has a power supply circuit for power-up all the modules.

 

 

Schematic_Sensing_node.jpg

schematic design of Sensing node. The gas sensor output is connected to the voltage clipping circuit because the A/D of CC430 can read maximum of 3.3V and gas sensors output varies from 0V-5V.The Output of clipping circuit is connected to CC430  via A/D convertor. The A/D reads the output of Methane and CO gas sensor and translates its voltage level to the respective gas concentration. The Accelerometer is connected to CC430 via I2C interface. The battery monitoring circuit output is connected to A/D of CC430. A/D read the value of voltage from battery monitoring circuit and displays the status of the battery on respective LED. A 1Kbit of SRAM is included to stationary node due to insufficient internal memory of CC430.

 

 

 

RF_matching_ckt.jpg

 

Following is the power supply circuit diagram supplying +3.3V and +5.0V

 

power_ckt.jpg

 

During testing we were able to send and receive data at a distance of 100 meters with RF power output of +12dbm

 

Embedded Strings inc  is a well-established company which specializes in the design, development, testing and manufacturing of complex embedded systems/Hardware. Our target markets are healthcare, telecommunication, aerospace and remote monitoring.


We have delivered customized hardware and software products that have application in wireless sensor networking, wireless tracking, digital signal processing and innovate medical monitoring devices.


We specialize in Field Programmable Gate Array design , we have developed our own VHDL/Verilog ip cores that have been integrated in high performance embedded systems, Nios SOC , ARM SOC and Digital Signal Processing.

Please feel free to contact us in case you need to utilize any of the services that our company provides. We guarantee you complete security and confidentiality of information that you will share with us.

 

 

Thanking you ,


Ahmed Asim Ghouri

Embedded Strings inc

Website : www.emstrings.com

Email : support@emstrings.com

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