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The kit is consisted of transmitter and receiver, popular used for remote control.
Basic Specification:
Frequency: 433Mhz.
Modulation: ASK
Receiver data output: High - 1/2 Vcc, Low - 0.7v
Transmitor input voltage: 3-12V (high voltage = more transmitting power)
Transmitting range (work at 5V): 40m indoor, and 100m in open air
Usage:
The popular link is like this: MCU -> Encoder -> Transmitter ------ Receiver -> Decoder -> MCU,
PT2272(Encoder) and PT2262(Decoder) are optional, their existence is to 1)avoid confusing when multiple RF links in range 2) isolate disturbance. You can integrate the encoding and decoding work to the MCUs on both side. Whenever there is no 315Mhz devices around, you may use it as direct cable connection.
Excuse for the documentation, we will work on them. Before that, please consult us for any details, we are happy to find the answer for you. We tried them using the guide from Sparkfun, it's compatible. The only difference is in package, of some excess GND pins.
Moreover, we will make more RF modules ourselves with different frequency and capacity. The next one in plan is based on cc1100 Please suggest us about your need .
Documents
Please visit our wiki page for more info about this product. It will be appreciated if you can help us improve the documents, add more demo code or tutorials. For technical support, please post your questions to our forum.
Hi,
have you tested the transmitter at 12 volts? If so, what was the distance the signal travelled?
Thanks.
Hi~ thanks for your interest in this product, we do not test it before. But our supplier verify to us that the distance could up to 40m indoor/100m in open air if powered by 12 volts.
pretty cool modules - didn't tested the range but i think will be ok for what i need ive also use the virtualwire library which its at version 1.7 updated to work with the arduino ide 1.0
but someone should look at the image from the wiki page specially at the RX module which its drawn a bit odd - i mean the pins are labeled ok only if you view the module from behind if you look at if from the from (where the green coil is) pins are backwards - and that almost killed my module cause i didn't pay attention to the image
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Johannes wolff | 2011-04-12
READ this to get this going in 20 minutes with arduino:
- download newest VirtualWire lib from http://www.open.com.au/mikem/arduino (1.5 as of march 2011)
- (there's also a pdf file at that link)
- transmit pin is 12 and receive pin is 11 by default
- done and working just fine:-)
======================
my additional findings:
-don't even try to transmit UART - these modules are tuned so badly that you just end up being frustrated
-keep in mind 315MHz/433 MHz might be illegal to use in some countries. but since you don't care anyways :-) choosing the right frequency will avoid possible interference
-the comments on sparkfun helped me to finally get this thing going.
-in contrast to another comment here the contacts were labeled the right way (april 2011)
-i think product isn't RoHS (if you care about that stuff...)
-for "debugging" just put a speaker on the data out of the reveiver to "hear" if signal arrives (to make sure the transmitter transmits something)
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Gleb Devyatkin | 2011-02-21
excellent work and easy to use =) like it
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Abdul Rahim Ansari | 2010-07-19
Dear Sir,
My Questions are as follows:
1. What is the min. and max. distence range for this module?
2. Is it suitable for Multiple wireless devices?
3. The data pins can we connect to Serial Port of MCU at TTL signals directly?
4. Our prject is 4x4 key pad + USB +with LCD and wireless communication between then keypads.So, kindly provide some suggessions which MCU we would have to use for this application .
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Jacket Chueng
