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8051 with GSM and fingerprint sensor simultaneously

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engg.embedded

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gsm sensor circuit

Hi...
Im in a project where i hv to interface a finger print sensor and GSM module with 8051 controller. Can anyone gv me an idea hw to do the interfacing of both of these things simultaneously? Im using finger print sensor-FIM3030N. indivually im able to do the interfacing bt i want to do both simultaneously. When a unrecognized finger is detected a msg is sent through GSM.
ny ideas???
thnks
 

fingerprint sensor ckt

hi....
finger print sensor is used and GSM module is interfaced in the text mode(i.e. sms mode)
 

fingerprint gsm

No . I am asking u how both fingerprint sensor and GSM module are connected? by what hardware interface?
 

fim3030n

thats my question... hw to do it? see GSM module can be interfaced individually through Rx and Tx pins(pins 10 and 11) and same is the case with fingerprint sensor bt again indivually. bt i hv to interface both of them simultaneously, so thts what i dnt knw hw to do it...
 

fingerprint sensor chennai

Hi,

There are a plenty of microcontroller which has two dual UARTs. If not U can added an external UART IC such SC28C92 which has 4 UART ports
 

fingerprint sensor uart

hi...

if i use a UART extender that means i'll hv to program tht also separately. Rite?

regards,
shweta
 

uart fingerprint

hi
for that you need 3 things
1) 8051 board with 2 serial port like P80C669 of NXP
2) GSM Modem supporting Serial intrfacing
3) Fingrprinting module supporting Serial intrfacing

one thing i want to ask you that do you need standalone system or computer.???
 

fingerprint tx rx

hi...
the Gsm module and FP sensor both have serial communication. If i interface them separetely it can b done, bt i want to interface them simultaneously. the working is smthng like ths:
if i use my finger over the FP sensor, n incase my finger is not recognized by the sensor, a msg is displayed on the LCD as well as a msg is aslo sent through the GSM module. So i need a solution in which both can b done together through one serial port of 8051.
i tried sending the msg serially thrugh a I/O pin(pin P1.0), bt it didn wrk.
ny mr ideas?

regards,
engg.embedded
 

8051 address bus

Hi ,

The way you put it , it does not sound like you need duplex data transfer simultaneously on the port.
1)If that's the case then you could use something like a 74HCT151 to switch the
signal from either of the transmitters ( viz. modem / fingerprint reader) , by the micros software. Similarly for the receiver.
2) You could implement a bit bang (software) UART on some other pins of the micro.
3) You can probably get a SPI or I2C fingerprint reader ( i don't know ).

Or as already suggested go for a micro with dual UARTs. Or UARTs.
I think P80C669 is unavailable in India ? 89C669 is discontinued atleast. Its more expensive than a low cost ARM (LPC21xx) which would work out , provided costs match.
Can you give a link to the FP reader ?
 

fingerprint hardware schematic diagram

Yes. P89C669 was discontinued long back...

Hi engg.embedded,

U just need to configure SC28L92 UART IC . The configuration is done by writing the registers present in SC28L92 via the Multiplexed data/Address bus.


If u are interested in 8051 Micros with dual UARTS visit

www.siliconlabs.com
 

fingerprint interface with 8051

Hi,

As already mentioned above, you can multiplex TX/RX pins of the controller at TTL level and use two MAX232 ICs to connect to each device separately. Only limitation in this case is that you can communicate with only one device at a time, which I think is OK in this application?. Alternatively you need to go for a controller with two UARTs.

Regards,
Laktronics
 

fingerprint sensor controller

You could even use 1 MAX232 , if you are doing software/no handshaking.
 

serial fingerprint sensor

HI,

While multiplexing please make sure that your FP module is programmedin mode that it gives reply only on commands from the micro. If the fingerprint sends data to the controller on sensing a finger and if the UART is routed to the GSM module then u may miss some data
 

finger print sensor interfacing

Hi...
the link for the FP sensor is:

**broken link removed**

regards,
shweta
 

how to do simultaneously fingerprint

Hi,

If u want to do this project in 8051 itself with 1 UART, then use relay concept.

Connect the tx, rx pins in Relay's(dual contact) common pin. Toggle the pin when

you want to access the finger print reader and GSM modem. Relay's NC and NO

pin --> one for GSM's TX and RX and another for fingerprint
 

interfacing fingerprint reader to microcontroller

hi...
that is exactly what i have done finally.... jus cmpleted with the relay ckt and attached it with different serial ports(one of FP and other of the GSM through MAX 232)... bt its still not working. i dnt knw wht the problem is nw...
 

fingerprint sensor interfacing with 8051

Hi,

Does the fingerprint sensor report a authenticated finger on itself or u give a command to authenticate a finger every time.

If the sensor is reporting a authenticated finger on its won then there is a chance that when the sensor reports a authenticated finger the Relay might have been connected to GSM module.

If u think this might not be the problem then please state the exact misbehaviour which u are seeing
 

fim3030n working

Hi,

This concept will work correctly. Send me the circuit configuration.

Regards,
Rajeshwari
 

fingerprint with microcontroller

Send me the circuit please. If the hardware may be wrong.
 

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