PIC16F887 interfacing

SurEC93
Member • Oct 1, 2013

PIC16F887 interfacing

I am working with a project that uses PIC16F887 to be interfaced with GSM, GPS and rf module.
Here in the circuit can someone tell how rs485 works and is there any error in the circuit?

I need a quick reply!
Please find the attached image of the circuit.

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yogi.bharadwaj

Member • Oct 2, 2013

can u tell me the project aim.what u wants to do?

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SurEC93

Member • Oct 2, 2013

This is the receiver unit that will receive information through rf module and send it through GSM. Also the location will be sent by getting it through GPS receiver.

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yogi.bharadwaj

Member • Oct 2, 2013

connections are right because pic16f uses pin 25-26 for wireless communication what error it shows?

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Harshad Italiya

Member • Oct 2, 2013

Will you please explain me why you want RS485 interface between PIC and GSM modem?

For RS485 communication you will need to change one pin HIGH and LOW based on the transmission or reception if you are using RS485 chip with SIM300 GSM modem how your modem is going to control this pin? Modem is not capable for that.

Are you not going to use all these things PIC,GSM,GPS and RF on single board?

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SurEC93

Member • Oct 16, 2013

Harshad Italiya
Will you please explain me why you want RS485 interface between PIC and GSM modem?

For RS485 communication you will need to change one pin HIGH and LOW based on the transmission or reception if you are using RS485 chip with SIM300 GSM modem how your modem is going to control this pin? Modem is not capable for that.

Are you not going to use all these things PIC,GSM,GPS and RF on single board?
Actually even I don't know the exact use of RS485 and its working. Would you please try and explain a bit about it?

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Harshad Italiya

Member • Oct 17, 2013

SurEC93
Actually even I don't know the exact use of RS485 and its working. Would you please try and explain a bit about it?
Normally RS485 is used to replace your UART communication for long distance.
UART have limitation that it can not go beyond some distance and if you replace it with RS485 you can achieve higher communication distance with same UART protocol.

Have a look at this link :- #-Link-Snipped-#

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