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bi-directional interms of zigbee
Well, that's an interesting question.... I've never reverse engineered one so I don't know.
Perhaps the receiver circuit is low enough power that it can stay on all the time.
Do some calculations based on the info in that app note I posted and find out. :)
low osc frequency
I would recommend using the built-in RC oscillator rather than building your own if you're worried about the timing accuracy. The internal RC is factory calibrated and probably far more accurate than your own RC will be, unless you use very high grade components. Generall...
circuit to low power wireless weather station
The topology I mentioned would involve the receiver to be active all the time. I'm imagining a system which would consist of a receiver/display device (or PC) located inside somewhere, connected to mains power so that it's active all the time. The...
weather station microcontroller project
ZigBee is RF. And these days might indeed be a good system to try since there are some quite inexpensive RF modules that implement the ZigBee protocol and make it easy for users to send and receive data without handling the low-level signalling.
However...
That's untrue. Open drain is the FET equivalent of open collector. Many modern ICs such as microcontrollers use FET type outputs instead of bipolar technology.
wireless weather station revers engineered
I've done a bit of digital sending over small RF modules. First you need to decide if you want/need bi-directional communication or not. You might find it cheaper and easier not you. Each sensor could sleep for a while, and then wake up every so often...
Re: Slew Rate
Or you can improve slew rate performance by reducing the line loss in long cables. This is affected both by the DC loop loss, as well as frequency-dependant losses caused by skin effect in the cable.
Using an equalizer can help to restore lost high frequencies, in digital or...
Yes. Generally for I2C you would use a 4.7K resistor to pull up each line.
In terms of other types of lines, anything with an open collector or open drain would need a pull-up if you want to convert the output to a voltage to use for controlling something. If the "lines" are microcontroller...
You don't need a special circuit. You just need to implement Wake-on LAN, which is easy to write in any language that allows you to send UDP packets or something similar. I wrote a little program in C and I think it worked on the first try. Here's a page...
Re: need help urgently
Hi,
Two points about your problem:
1) You need to realize that you aren't going to be able to match the coordinates directly by comparison, unless you reduce the resolution of the data. Just chopping off digits isn't really very good because you could end up being quite...
at91sam7x ethernet
I'm working on an application with an Atmel AT91SAM7X doing ethernet. I'm using FreeRTOS on a Make Controller Kit that I got as a demoboard. I'm looking to build a custom board that can run some of the same code.
My question is, can any PHY be used to connect to the micro...
Looking to meet some people who know RF in the Toronto area. I'm a full time hardware developer looking to learn about radio, RF, etc. and want to chat with people who can explain some of the concepts to me, or maybe want to work on some hobby projects in some spare time.
Even just chatting...
Hi,
I'm using a 74HC4046A PLL/VCO to demodulate mono audio from an FM carrier. The carrier comes from a signal on CAT5e twisted-pair cable. (it rides on the common-mode on one pair which carries video on the differential mode) The carrier frequency is about 250kHz and the amplitude seen by the...
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