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Wireless - transmitter and receiver

 
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Maverickmax



Joined: 06 Dec 2004
Posts: 384
Helped: 3
Post02 Jan 2005 23:07   Wireless - transmitter and receiver
Hi

Im doing another mini-project and I need to connect a transmitter and receiver to two AT89C51 respectively so that temperature microcontoller with transmitter send the data to the reciever but the problem is that I don't know nothing about wireless circuit such as ultrasonic, IR and radio circuit. I intend to experiment with three different wireless channel so can you please give me any recommendation?

P.S - Do I need to transmit serial data across wireless channel using PWM or serial communication? Which one is better? I look forward to hear from you guys

Maverickmax
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SAR



Joined: 25 Sep 2002
Posts: 152
Helped: 4
Post02 Jan 2005 23:17   Re: Wireless - transmitter and receiver
Definately serial communication. Forget PWM, not ment for communication between points.
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Maverickmax



Joined: 06 Dec 2004
Posts: 384
Helped: 3
Post03 Jan 2005 0:02   Re: Wireless - transmitter and receiver
So that means I will have to use RS232 and connect to the wireless circuit?

Maverickmax
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djalli



Joined: 10 Nov 2001
Posts: 887
Helped: 15
Location: 1600 Pennsylvania Avenue, Washington DC 20500
Post03 Jan 2005 5:55   Wireless - transmitter and receiver
If you use a microcontroller and serial communication to communicate with it you need to use at least some RS232 communication.
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pico



Joined: 30 Sep 2001
Posts: 261
Helped: 6
Post03 Jan 2005 7:50   Wireless - transmitter and receiver
It's depend on your Tx and Rx interface needed what voltage level. If it needs only TTL level you can connect with the uC directly then transmit and receive serially.
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klystron



Joined: 11 Jul 2002
Posts: 114
Helped: 2
Post03 Jan 2005 12:53   Re: Wireless - transmitter and receiver
Use the Nordic nRF24E1 chip
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bilgekaan



Joined: 18 Nov 2004
Posts: 118
Helped: 14
Location: Turkiye
Post03 Jan 2005 13:18   Re: Wireless - transmitter and receiver
i saw somw rf kits made of simple transistors , caps , resitors and saw . does some has schematic for this kind of receiver/transmitter?
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Maverickmax



Joined: 06 Dec 2004
Posts: 384
Helped: 3
Post03 Jan 2005 15:48   Re: Wireless - transmitter and receiver
Klystron

Thank you for suggesting to use Nordic nRF24E1 chip and I believe it will be useful for my mini-project but do you know any tutorial or examples of using this chip to communicate wireless?

Maverickmax
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klystron



Joined: 11 Jul 2002
Posts: 114
Helped: 2
Post03 Jan 2005 16:13   Re: Wireless - transmitter and receiver
Take a look at the Nordic site http://www.nordicsemi.no
Ther is a example for a wireless mouse
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Borber



Joined: 01 Jan 1970
Posts: 1492
Helped: 112
Post03 Jan 2005 17:20   Re: Wireless - transmitter and receiver
Recently I made this RX and TX with SAW resonator. It operates on 433.92MHz with ASK modulation. Max modulation frequency is about 6kHz square pulses with amplitude equal supply voltage.

Sorry, but you need login in to view this attachment
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SAR



Joined: 25 Sep 2002
Posts: 152
Helped: 4
Post03 Jan 2005 17:43   Re: Wireless - transmitter and receiver
Goto Rentrons site and look around there real good and you will find a lot of good information and examples.

http://www.rentron.com/PicBasic/RemoteControl.htm
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e_eja



Joined: 15 Nov 2003
Posts: 145
Helped: 4
Post05 Jan 2005 12:10   Re: Wireless - transmitter and receiver
i think it's depent on your design consideration, sush as:
1. power consumtion
2. distance
3. communication between equipment (micro)
4. transmission medium

Quote:
RX+TX+antenna 422MHz.zip - ZIP archive, unpacked size 131,073 bytes

btw if i am not using smd component would it work well, and how do i get the saw resonator
thank's
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Borber



Joined: 01 Jan 1970
Posts: 1492
Helped: 112
Post05 Jan 2005 19:44   Re: Wireless - transmitter and receiver
e_eja
SMD elements are used for smaller dimensions of RX and TX. I have not tried ordinary elements. Stability problems may arise.
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