Possible for a circuit to fit in this size space?
Possible for a circuit to fit in this size space?
(OP)
Not being a circuit designer, I don't know if the following is possible:
I want to have a circuit board that has two sensors - temperatue and barometric pressure - and an RF transmitter in the 300-400 MHz range to send the temp and press data to a receiver up to 20 feet away. The board must fit in a volume of 2.75" x 1.75" x 0.75". I want the data to be sent every 1 seconds, so I think two RF data channels are required.
Is a board with these specs possible? Will two RF channels be required, or can one be used to save space and cost?
Thanks!
--Bob
I want to have a circuit board that has two sensors - temperatue and barometric pressure - and an RF transmitter in the 300-400 MHz range to send the temp and press data to a receiver up to 20 feet away. The board must fit in a volume of 2.75" x 1.75" x 0.75". I want the data to be sent every 1 seconds, so I think two RF data channels are required.
Is a board with these specs possible? Will two RF channels be required, or can one be used to save space and cost?
Thanks!
--Bob





RE: Possible for a circuit to fit in this size space?
Some pre-made RF modules have an on-board temperature sensor. Many of these are the size you give, or smaller.
Many of these modules are design to transmit in one of thethe ISM band (Industrial Scientific Medical) frequencies. For the range you need, there are some around 400 MHz (can't recall the exact ISM frequency assignments around there) or the 868 MHz (Europe), or 900-925 MHz (North America) bands.
The most basic use ASK modulation which in some situations may not provide enough noise or communication robustness but are the least expensive, but may be fine for your short-range needs. Remote car locks are usually ASK. More capable modules use FM or FHSS modulation. Even better modules with more range than you need will be full transceivers and use a digital modulation method, and may just state 'digital spread-spectrum', or be built to a standard such as 802.15.4/Zigbee or such.
There are many module manufacturers out there. Search around and I'm sure you will find a module pair (transmitter and receiver) that you can try for your application.
RE: Possible for a circuit to fit in this size space?
RE: Possible for a circuit to fit in this size space?
Dan - Owner

http://www.Hi-TecDesigns.com
RE: Possible for a circuit to fit in this size space?
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RE: Possible for a circuit to fit in this size space?
Thanks!
--Bob
RE: Possible for a circuit to fit in this size space?
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