Post : Very inexpensive RF module tutorial
URL : http://hackaday.com/2012/08/19/very-inexpensive-rf-module-tutorial/
Posted : August 19, 2012 at 8:00 am
Author : Brian Benchoff
Tags : freescale, radio, TLP434A, wireless
Categories : radio hacks

http://hackadaycom.files.wordpress.com/2012/08/radio.jpg

Let's say you need a way to make a project wireless, but don't have the scratch for a ZigBee or its ilk. You could use IR, but that has a limited range and can only work within a line of sight of the receiver. [Camilo] sent in a project (http://candelectronica.blogspot.com/2012/08/contro-remoto-por-rf-con-modulos.html) (Spanish, translation (http://translate.google.com/translate?sl=es&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fcandelectronica.blogspot.com%2F2012%2F08%2Fcontro-remoto-por-rf-con-modulos.html&act=url) ) to connect two devices via a wireless serial connection. As a small bonus, his wireless setup is cheap enough to create a wireless network of dozens of sensors.

[Camilo] used the TLP434A (http://www.laipac.com/easy_434a_eng.htm) transmitter/receiver combination to get his wireless project off the ground. These small devices only cost about $5, but being so inexpensive means the hardware designer needs to whip up their own communications protocol.

For a microcontroller, [Camilo] chose a Freescale MC9S08QC, a pleasant refrain from the AVR or PIC we normally see. After making a small board for his transmitter, [Camilo] had a very small remote control, able to send button presses or other data to a remote receiver.

After the break, you can see a short demo video [Camilo] posted of his wireless transmitter turning on an LED attached to his receiver. Unfortunately, this video was filmed with a potato, but all the schematics and code is on his web site for your perusal.

Read more of this post (http://hackaday.com/2012/08/19/very-inexpensive-rf-module-tutorial/#more-83043)

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translation:

All we ever wanted or needed to activate a device or remote control and for this we require a "Remote Control". Often used much of that work via IR (infrared) but sometimes we need to use a remote control via radio frequency to improve the range and have line of sight obstacles.

RF modules used two low-cost and easy integration. One is the TLP434A module is an RF transmitter tuned to the frequency of 433.92MHz. The receiver module is also RLP434 that is tuned to the same frequency. These modules work by sending and receiving data using serial-5V 3V TTL levels, the transmission speed is 4800bps recommended.

datasheets and sources:

http://www.laipac.com/easy_434a_eng.htm

http://www.laipac.com/datasheet/TLP434A%200%205W%20Datasheet.pdf

http://www.laipac.com/Downloads/Easy/RLP434A.pdf

http://www.laipac.com/Downloads/Easy/rlp434.pdf

http://www.laipac.com/Downloads/Easy/tlp_power.pdf

http://www.laipac.com/form2011/laipac_components_order_form.pdf

schematics (eagle) & PCB

http://205.196.121.187/2i7r93ahvfkg/8gdmwwaa3i3ahfw/Esquematicos+y+PCB.rar

code

http://205.196.123.40/845q8m84sfag/hok469j29j026q1/Cremoto.zip

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