This robot will start moving whenever the sensor detects
any obstacles and can avoid them. With it's built-in AVR
microcontroller. The user can re-write any program for getting
new applications.
Technical Specifications:
- Power supply : 2 AA batteries (not included).
- Consumption : 60mA.
- PCB dimensions : 2.54 x 1.18 in. (sensor board)
2.54 x 2.70 in. (control board)
(1) ROBOT CONTROL CIRCUIT
How To Work:
The circuit is composed of 2 major parts, sensor board and
control board, as shown in Fig. 1.
Sensor board have 2 sets, in set as transmitter and receiver
of infrared light. Transmitter part is consist TR2 and LED
INF. VR3 is used for adjust the level of infrared light. Receiver
part, when photo-transistor received infrared light from LED
INF, causing voltage being passed through. The more reflected
light will lessen the internal resistance and give bigger passing
through voltage. Less reflected light will enlarge the internal
resistance and give less passing through voltage. TR1 and TR3
will work when the photo-transistor received infrared light.
Control board, at the heart of the circuit is the AVR
microcontroller IC1. When photo-transistor is not receiving
infrared light, TR1 and TR3 are not working. IC1 will send the
voltage to pin 12 and pin 15, causing both motor is running
forward. If some photo-transistor received infrared light,
motor is running backward. IDE port is used for connect AVR
programmer.
Circuit Assembling:
The PCB will be divided into two boards, AVR2-1 for
circuit controlling and Body set for body, motor gear, wheel
and battery holder assembling.
The AVR2-1 circuit assembling has been shown in Fig 2. It
is recommended to assemble the circuit starting with a less
height component i.e. diodes, resistor, electrolytic capacitors
and transistors etc. Be careful while assembling and check for
the matching of PCB poles and components before soldering as
shown in Fig 3. For IDE port, press the pin of IDE port to be
level with the black plastic before soldering. Use a max. 40W
solder and soldering tin with a tin and lead ratio of 60/40
together with a joint solution inside. Recheck the assembled
circuit for your own confidence. Better use a lead sucker or a
lead wire absorber in case of component misplacing to protect
PCB from damage.
The Body set is to be assembled as shown in the next page.
Testing:
When the two circuit boards have been completely
assembled, jump J2 and not jump J1. Insert two AA batteries
into the battery holder. Then adjust VR1, VR2 and VR3 to the
middle side and slide switch SW to "on" position. LED at
sensor board is lighted on. Lay down the assembled robot on
the box. When any sensor detects bar, The robot will avoid the
bar and running the other way.
VR1 and VR2 will act as sensitivity of photo-transistor.
Adjust VR1 and VR2 to the left hand side for decreasing
sensitivity and to the right hand side for increasing sensitivity.
VR3 will act as level of infrared light. SW1 is not used.
Troubleshooting:
As the circuit has only a few components, the main cause of
troubles will come from component misplacing and defaulted
soldering. When found out that the circuit does not work,
check for the proper component placings and various
soldering points.
FUTURE KIT
FUTURE KIT
HIGH QUALITY ELECTRONIC KITS
HIGH QUALITY ELECTRONIC KIT SET FOR HOBBY & EDUCATION
AVR2 OBSTACLE-AVOIDING ROBOT
CODE 1110
LEVEL 3
Figure 1. AVR2 Obstacle-Avoiding Robot Circuit
Figure 2. AVR2-1 and SENSOR3-1 Circuit Board Assembling
R
http://www.futurekit.com
µFµF
µF
µF
µF
AVR2-1
150
ON OFF
150
150
50
500
500
500
500
500
500
500
500
1K
J
J
4001
0.1
0.1
0.1
+
47
µ
F
+
47
µ
F
ATTINY2313
C9013
3
C9013
4
C9012
5
C9012
8
C9013
7
C9013
6
C9012
2
C9012
1
1K
3K
500
1K
3K
1K
10
C9013
3
C9013
2
C9013
1LED
A
K
VR1
L
VR2
R
VR3 I
SENSOR3-1
L
+P
IR
+
P
I
SW1
G
SENSOR BOARD
RESISTORS 1/8W
R1 500Ω- green-black-brown-gold
R2,R5,R7 1kΩ- brown-black-red-gold
R4,R6 3kΩ- orange-black-red-gold
RESISTORS 1/4W
R3 10Ω- brown-black-black-gold
TRANSISTORS
TR1-TR3 = C9013
CONTROL BOARD
RESISTORS 1/4W
R1,R2,R4 150Ω- brown-green-brown-gold
R3 50Ω- green-black-black-gold
R5 1kΩ- brown-black-red-gold
R6-R13 500Ω- green-black-brown-gold
TRANSISTORS
TR1,TR2,R5,R8 = C9012
TR3,TR4,R6,R7 = C9013
DIODE D1 = 1N4001
IC IC1 = ATTINY2313
IDE port
(Connect with programmer) IDE port
IDE port
NOTE : For all IDE port to
insert the PC-board and solder
without trim leg.
IDE port (J2)
Jump = Normal Use
No Jump = Programming
IDE port (J1)
Jump = Using the 3 sensor.
No Jump = Using the 2 sensor.
IDE port
IDE port
NOTE: Jumper J1, If jumping this point is using 2 sensor (left
and right side) but if no jumping this point is using 3 sensor (left,
right and front side).
RESISTOR ELECTROLYTIC
CAPACITOR
TRANSISTOR
TRIMMER
POTENTIOMETER
Figure 3. Components Installing
Watch the polarity!
RED LED
LED Infrared
(Blue Clear)
R .....
Ω
R
R
TR
TR
NPN
B
E
C
K
A
LED
K
A
LED
LED
VR .....KΩ
1
2
3
VR
VR
C
+
+
C .....
µF
C
+
PNP
B
E
C
PHOTO TR
P
II
P
D
KA
K
A
K
A
K
A
LED INF
DIODE
Photo-Transistor
(Black)
