Presentation | Power supply | Infra-red radar | Motor drivers | CPU |
PC Interface | PC Software | Frame
Italian documentation

PC Interface board

PC interface board get data from the COM2 seral port (you must connect this board to the COM2 port) and work out them, before send the route to the robot.

Radio module is build on the interface board, connected to PC by serial port. Serial outpus level are different from TTL's: - low level (0) is +12 V;
- high level (1) is -12 V.

This signals must be changed. An inverter reverse logical levels. So after the inverter you can find: - +12 V for high level (1);
- 0 V for low level (0).

+12V level must be lowered to +5V TTL. This is do by a resistor with a 5.1V zener diode.

Data can now used as input by radio module. This is build in SMB technology, and modulate bits into AM OOK on a 433MHz carrier. Radio signal is spread by an aerial.

Receiver radio module put on the robot get data and decodes them, allowing ST6 to read the route.

Jack connector permit cable connection: so you can drive Stream without a radio module, too.

Electric sheet

Printed circuit board

COMPONENTS:

R1= 4.7 Kohm - 1/4 W
D1= zener 5.1 V
D2= 1N4148
C1= 10 uF - 63 V - electrolitic
IC1= 40106
IC2= RF module TX-SAW IA 433 MHz
JACK1= mono jack connector
COM2= connector DB9M

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