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

Infra-red radar system

The infra-red radar system can get obstacles ahead or backwards of Stream, till a distance of 15 cm.

An infra-red transmitter diode generate an invisible light signal: if the IR receiver diode get this signal, a lower pulse is sent to the CPU's NMI pin. This pulse stop immediately the robot.

This radar can notice obstacles beetwen 4 to 15 cm, dependig on its reflecting coefficient.

Electric sheet

Printed circuit board

COMPONENTS:

R1= rad_itf*
R2= 12 Kohm - 1/4 W
R3=R25 1 Kohm - 1/4 W
R4=R5= 1 Mohm - 1/4 W
R6=R8= 33 Kohm - 1/4 W
R7=R10=R23= 18 Kohm - 1/4 W
R9= 68 Kohm - 1/4 W
R11=R14= 390 Kohm - 1/4 W
R12=R15=R28= 470 Kohm - 1/4 W
R13=R17= 150 Kohm - 1/4 W
R16= 39 Kohm - 1/4 W
R18= 120 Kohm - 1/4 W
R19=R26=R29=R30=R31= 10Kohm - 1/4 W
R22= 10 Kohm - trimmer - 1/4 W
R20=R27= 100 Kohm - 1/4 W
R21= 3.3 Kohm - 1/4 W
R24= 330 Kohm - 1/4 W
C1=C2=C21 10 nF - 63 V - polyester
C3=C8=C15=C16= 100 nF - 63 V - polyester
C4=C20= 100 uF - 25 V - electrolitic
C5= 100 pF - ceramic
C6=C7=C9=C10= 47 nF - 63 V - polyester
C11=C12= 1 nF - 63 V - polyester
C14= 330 pF - ceramic
C17= 10 uF - 25 V - electrolitic
C18= 1 uF - 63 V - polyester
D1=D2=D3=D4= 1N4007
DZ1= zener 5.6 V
DTX1=DTX2= LD271
DRX1=DRX2= SFH2030
IC1= NE555 C-MOS
IC2= TL084
IC3= TL082
IC4= LM358
IC5= 74HC123A
MORS1= 4 pole connector

(*) RAD_ITF
R1= 33 ohm - 1/4 W
R2= 4.7 ohm - 2 W
TR1= BD138

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