434 / 315 MHz 8 Channel Secure Remote Control
NEX Robotics Pvt. Ltd.
1
www.nex-robotics.com
434 / 315 MHz 8 Channel Secure
Remote Control
Figure 1: 434 / 315 MHz 8 Channel Secure Remote Control
Introduction
434MHz 8 Channel Secure Remote Control gives out 8 TTL / CMOS level logic outputs.
Four outputs can be used to control direction of the robot and remaining 4 can be used for
other actions, velocity control etc. Switches are arranged in 4 + 4 format for user friendly
control with left and right hand. Remote has range up to 100 feets in outdoor
environment. Each remote control has 10 security bits settings which can be used for
pairing of one transmitter and reciver. Because of the security bit settings command from
one transmitter will not accidentally trigger reciver of the other robot. On the reciver
output is buffered using IC 74HC245 and command output is also displayed on the LEDs.
This remote is based on
434 MHz ASK Transceiver Module
and
HT640
and
HT648
encoder and decoders which can be used for transmitting 8 commands with 10bit security
address setting. You can transmit multiple commands at the same time by simultaneously
pressing multiple keys. Which also means you can use few keys as shift key and probably
control up to 255 devices. Outputs are non latched types. I.E. outputs will remain logic 1
till the remote transmitter’s key is pressed.
Transmitter and reciver both are reverse polarity protected. Both of them have low drop
voltage regulator. Transmitter has power switch. Transmitter and receiver can be powered
by 9V battery or 7 to 12V supply. Remote control has onboard PCB antenna and terminal
for connecting the wire antenna. PCB is made up of high quality glass epoxy material
with the double sided through hole layout for giving additional strength to the switches
and connectors.
Robot can also be controlled by PC by soldering DB25 male printer port connector at the
bottom side of the PC and connecting it with the PC. This feature is not yet tested.
