- Whimsical Doorbell in Nuts and Bolts Oct 2005 is Very Nice
Mrdavidjenkins
Posts: 49
Remote Alert Project idea.
I am very happy with the radio transmitter and receiver kit that·I purchased from italiano34@hotmail.com for the project "Whimsical Doorbell' in the October issue of Nuts and Bolts.· If you remember, the project building folk art doorbell ringer with a wireless connection to a remote receiver.· On one of the projects I am working on I need to monitor a process and alert someone remotely.· The Kit I purchased from Andy is very useful and will do everything I need at a reasonable price ($50)
Here is a link to the article:
http://www.nutsvolts.com/toc_Pages/oct05toc.htm
He has been really helpful and quick in responding.· I expect that I will be buying a few more from him as I need them.
I am very happy with the radio transmitter and receiver kit that·I purchased from italiano34@hotmail.com for the project "Whimsical Doorbell' in the October issue of Nuts and Bolts.· If you remember, the project building folk art doorbell ringer with a wireless connection to a remote receiver.· On one of the projects I am working on I need to monitor a process and alert someone remotely.· The Kit I purchased from Andy is very useful and will do everything I need at a reasonable price ($50)
Here is a link to the article:
http://www.nutsvolts.com/toc_Pages/oct05toc.htm
He has been really helpful and quick in responding.· I expect that I will be buying a few more from him as I need them.
Comments
Not to be picky, but for 434MHz, a 9.36 inch antenna does not seem optimal.
Wavelength = velocity(speed of light in meters) / frequency (Hz)
.691 meters = 300Mm / 434MHz
.691 meters * 39.37 = 27.2 inches ' Convert meters to inches
Full wave = 27.2 inches
1/2 wave = 13.6 inches
1/4 wave = 6.8 inches
1/8 wave = 3.4 inches
Most likely you would use a 1/4 wave or 1/8 wave antenna.
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Beau Schwabe
IC Layout Engineer
Parallax, Inc.
I did not change the antennae length, but I got some pretty great results. I was hoping for 100 ft range, but I got about 300 ft with a strong signal. This was in a open warehouse like environment with 2 concrete walls separating. This is a very nice product and was really useful in an application where I needed a remote allert. Recommended!
Dave