Discussion in "New Ideas regarding projects" started by    shirazi2589    Aug 22, 2010.
Tue Aug 31 2010, 03:37 am
#21
>>What is a hyper terminal, I have no clue
Its a terminal software come along with Windows (not available in Vista and Seven).

goto Start -> All Programs -> Accessories -> Communication -> Hyper terminal

>>Also virtual terminal model is not there in proteus 7.6 how do i get it pls reply as i'm online now

Click "Virtual Instrument Mode" icon in proteus from left side panel. In instrument list you will see "Virtual Terminal". use this in your project directly. you do not need any max232 as its all virtual. so tx goes to rx and rx to tx thats all.
Fri Sep 03 2010, 02:22 am
#22
Hey ajay,
you said that sim300 GSM modem is good
But u didnt specify ne thing for GPS receiver. Tell me some GPS receiver which is affordable at the same time very accurate and portable
Fri Sep 03 2010, 03:17 am
#23
Sim300 is good coz its cheap and easily available.

for GPS i cant say much coz prices may vary. take a survey of market look for prices. then we will see. For accuracy, go for a 20 or more channel GPS. rest we can do in software side.
Sat Sep 04 2010, 03:05 am
#24
Ok Ajay,
1)))Would i be required to configure GPS receiver for example sending some commands for it to be activated so that it would supply me with the RMC data OR i just need to connect the power supply and it would start sending me the data

2)))Instead of using AT89s52 which has 1 UART can i use AT89C51RE2 or DS89C420 which has 2 UARTS so that the use of CD 4052 would be eliminated
Sat Sep 04 2010, 05:12 am
#25
All GPS that I know of send the output whenever they have power.
With some you can tell it to only send certain types of information.
A micro with two serial ports will be better for this task.
Sun Sep 05 2010, 04:55 am
#26
The Atmel AT89C51RE2 is an 80C52 Compatible High-Speed Microcontroller, 128K ISP-Flash on-chip, 256 Bytes Scratch Pad RAM, 8192 Bytes on-chip XRAM, Dual Data Pointer, up to 6 8-bit I/O Ports, 3 16-bit Timer/Counters, 10 Interrupt Sources with 4 Priority Levels, Integrated Power Monitor, SPI, 16-bit PCA, PWM, 2 UARTs, and WDT.
This is it this would be the perfect IC for my application purpose

ALSO i would like to know what is the difference between ISP(In System Programming) and IAC(In Application Programming)
Sun Sep 05 2010, 09:30 pm
#27
Should I go for 3 UARTS since 2 UARTS would be for my dedicated appications i.e GPS and GSM modem I also need to think about how i will monitor and debug your project. A "spare" UART can be extremely useful what u all expertise have to say on this
Sun Sep 05 2010, 09:31 pm
#28
Pls help me with the selection of GPS. What parameters should i look for in my GPS receiver.Ajay in one of the post said that look for GPS with 20 or more channels What does this statement exactly mean?
What all parameters should i look for before buying a GPS receiver
Mon Sep 06 2010, 10:02 pm
#29


the post said that look for GPS with 20 or more channels What does this statement exactly mean?
What all parameters should i look for before buying a GPS receiver

shirazi2589


20 channels means the GPS can keep track of 20 satellites at a time.
However far less that 20 are actually in the right place in the sky to be any use, so this figure
is not so important.

Go for a SIRF 3 unit, this is a good chipset and well developed by now.
The other important thing is the sensitivity of the GPS.
A normal figure as around -160dbm,
-155 dbm is a lot less sensitive
-165 dbm a lot more sensitive.

You can buy a GPS as a bare board or built into a "mouse" type case, which
do you want ?


[ Edited Tue Sep 07 2010, 01:58 am ]
Mon Sep 06 2010, 11:49 pm
#30
20 Channel EM-406A SiRF III Receiver with Antenna

sku: GPS-00465

Description: The EM-406A GPS module from USGlobalSat based on the spectacular SiRF StarIII chipset. This complete module is built upon the same technology as the ET-301, but includes on-board voltage regulation, LED status indicator, battery backed RAM, and a built-in patch antenna! 6-pin interface cable included.

The EM406A module makes a great gift for that special someone who's interested in playing with GPS. For more gift ideas check out the SparkFun Gift Guide!

Check out our GPS buying guide!

Features:

* 20-Channel Receiver
* Extremely high sensitivity : -159dBm
* 10m Positional Accuracy / 5m with WAAS
* Hot Start : 1s
* Warm Start : 38s
* Cold Start : 42s
* 70mA at 4.5-6.5V
* Outputs NMEA 0183 and SiRF binary protocol

Dimensions:

* 30mm x 30mm x 10.5mm
* 16g including cable

Documents:

* EM-406A Datasheet
* NMEA Reference Manual
* SparkFun GPS Tutorial
* GPS Tutorial by Michael Simpson
* SiRF Demo Software
* Wiring Example

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