Tuesday, September 24, 2013

Looking for baby monitor that does not have interference from wifi network and blackberry. Recommendations?

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bahiadave


Aware of Phillips model. Wondering if there is one that is not so expensive.


Answer
I have a Fisher Price 900 MHZ and we have a wifi network and have zero interference.

What we have is very similar to this, but it's a couple of years old: http://www.target.com/gp/detail.html/601-6545658-9279309?ASIN=B000I5RF8C&AFID=Froogle&LNM=B000I5RF8C|Long_Distance_900MHz_Baby_Monitor&ci_src=14110944&ci_sku=B000I5RF8C&ref=tgt_adv_XSG10001

How do you connect a sensor to a radio transmitter and programming it to transmit one task only?

Q. I badly need advice on how to do this for our science project. Our project is to monitor garbage through radio waves and sensors... the problem is that how do we connect the sensor to the transmitter and how do we get to program it to transmit the garbage levels... and one more thing... What Type of sensor do we use?


Answer
Sounds like a cool project that's best if broken down by section.

The key to a successful science project is to keep it as simple as possible while demonstrating one or more concepts. Cost will also be a concern. The trickiest part will be your radio link since there are all kinds of government regulations about what you can and cannot do especially at the unlicensed level. Instead you want to find a transmitter and receiver that already work well together over short distances. Garage door or car alarm remotes can be difficult to work with on the receiver end. A pair of cell phones might work if you have unlimited minutes to burn. Low power toy walkie talkies might work if you had a way to push the transmit button for short intervals. An iPod type transmitter and FM radio might work together. So would a couple of WiFi enabled laptops networked together through a wireless router, but now we're getting complicated again. A battery powered wireless baby monitor just might be the ideal solution.

Note that most of the transmit/receive link possibilities mentioned above involve audio. You'll want to use your garbage level to control either the frequency or volume of the audio you transmit. Volume is probably the easiest since you can use a relatively simple meter circuit at the receiving end to measure it.

One of the nice things about a science project is you can control many of the parameters. Use a small waste basket as your garbage can and use something that packs relatively uniformly like tennis balls or crushed aluminum cans as your garbage. Now all you need to do is weigh them to know how full the can is.

Place your garbage can on a plywood platform hinged at one edge and held up by springs. Get one of those slide style volume controls and rig it so that the slide moves as the platform edge moves under the weight of the garbage. Adjust the tension and number of springs as needed.

You'll need an audio source such as a simple oscillator or a steady tone saved on an MP3 player. This feeds the volume control on you platform scale which in turn feeds your garbage monitor transmitter (in place of the microphone).

The volume at the receiver (after substituting a meter for the speaker) will track the weight of the garbage. Lookup LM3914 for circuits that use LED's that you can label from empty to full.

I'm assuming that someone in your group can handle the basic electronic connections.

Now go get that A.

Don




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