Wireless with DS18S20

[lerameur]

hi
As for the ground and shielding, should I ground my antrenna or used a metal plate. I have a plastic box, is there a better method ? Of course the second wire of the antenna goes to the input..
ken

[Jerson]

No, no. You have to shield the receiver module as in put it in a metal box with just the antenna sticking out into the open to get the best results.

This is what I did - take a look here http://www.geocities.com/jerson.geo/...6/rfjoy004.jpg

the 2 green wires you see are the antenna for the transmitter and receiver modules

Jerson

[dhouston]

hi
As for the ground and shielding, should I ground my antrenna or used a metal plate. I have a plastic box, is there a better method ? Of course the second wire of the antenna goes to the input..
ken

There's no need for anything special and shielding is usually superfluous unless the receiver is near (6-8') an RF noise source. There are commercial antennas available cut for 433.92MHz or you can build your own - it depends on the range needed. A 6 inch piece of wire attached to pin 8 of the receiver may be adequate. Or you can use one like those sold by Bruce Reynolds...

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

or build one like...

• http://davehouston.net/eggbeater.htm

which can be built with any insulated solid wire stiff enough to hold its shape. The phasing line can be made from 75-ohm coax if 93-ohm isn't available.

For the transmitter, a 6" wire is usually more than adequate.

If you need extra range, add a wide-band preamp between the receiving antenna and receiver. Getting 150-200' through a few walls is usually possible.

I've ordered one of the RX/TX pairs so I can test the receiver. In the meantime, can you tell me what the chip is on the receiver? I'm interested in the 24-pin chip - I can tell it's a HiMark chip but cannot read the number. I'm familiar with a HiMark 18-pin superheterodyne ASK receiver chip but cannot recall seeing a 24-pin chip.

[lerameur]

Ok I am getting better reception with grounded antennas.

this is what is written on the 24 pin chip:
0637
BD69F1

ken