Description: RF
Transmitter/Receiver Serial Link for Robot
This
one way transmitter is designed as a wireless serial link for a
miniature 6 legged walking "spiderbot." The receiver
was designed to run off a 12V 1500mAh NiMH battery and the
transmitter from a 12V power supply(or battery). The circuit
takes data from a 9-PIN RS-232 port, converts it to a logic level
signal where it is transmitted to the receiver. In this
circuit the receiver transmits the data to the MAX232 chip where it
is converted back to a 9-Pin port for easy plug-n-play use.
This circuit can also easily be modified to talk directly to a
microcontroller by removing the MAX232 chip and connecting the RX
directly to the microcontroller. The circuit uses relatively
inexpensive parts RX-DFM-5V and TX-DFM-5V available from Abacom (www.abacom-tech.com)
and two mildly expensive(and VERY efficient) switching voltage
regulators part number PT5101N from PowerTrends (www.powertrends.com).
This
TX/RX combination has a great range and excellent data transmission.
The RX-DFM-5V has incredibly low power consumption rates. This
system is rated at a maximum data transmission rate of 19200
baud but I would recommend 9600 baud to make sure all the data
gets there reliably.
+Keep
the receiver antenna away from servos/motors/rf generating devices.
+Keep the transmitter antenna away from any power supplies.
+Connect the antenna to the transmitter via a shielded cable(EX: BNC
connector on the board -> shielded coax wire ->
molded 1/4 wavelength antenna). This will allow better
positioning of the transmitter antenna.
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