SUN TRACKER.pcb page 1 of 2

17

6

25

4

1498

1311

10

3

12

R11K

R210K

R31M

WEST LIMITSW1

IC1aLM339

IC1b

LM339

IC1cLM339

IC1dLM339

R6100K

R7220K

R8100K

R91M

R104.7K

R1110K

R12100K

R131M

C1.01µF

C2.01µF

C31000µF

D11N4004

R410K

R5100K

R141M

R15

10K

R1615K

R17100K

VR1

10K

VR21M

C4.01µF

C5.01µF

R184.7K

Q1

2N3904

Q2

2N3904

EAST LIMITSW2

Q3

2N3904

Q4

2N3904

R19100K R20 1K

R21100K R22 1K

LED 1

LED 2

(SWITCH OP[TIONAL)SW3

+12VDC

GND

WESTPC1

EASTPC2

DRIVE EASTRL2

DRIVE WESTRL1

D2

1N4004

D3

1N4004

DRIVE MOTORMT1

IN

REF

OUT7809RG1C6

.01µF C7100µF

C8.01µF

+9V

+9V

+9V

+9V

+9V+9V

+9V

+9V+9V

With sensors aimed at the sun adjust VR1 to the point where LED 2 will just turn OFF.

At end of day adjust VR2 to the point LED 1 will just turn ON. Start with the trim pot set ar GND. Turning it towards +9V increases the sircuit's sensitivity to light.

+9V

SUN TRACKER.pcb page 2 of 2

Name Quantity

.01µF Capacitor 6

100µF Electrolytic Capacitor 1

1000µF Capacitor 1

100K Resistor (1/4W) 7

10K Potentiometer 1

10K Resistor (1/4W) 4

15K Resistor (1/4W) 1

1K Resistor (1/4W) 3

1M Potentiometer 1

1M Resistor (1/4W) 4

1N4004 Diode 3

220K Resistor (1/4W) 1

2N3904 NPN Transistor 4

4.7K Resistor (1/4W) 2

7809 (9V, 1A) Voltage Regulator 1

DPDT Relay (12V) 2

LED (Red) 2

LM339 Operational Amplifier 1

Motor (12V DC) 1

PHOTORESISTIVE CELL 2

SPST Switch 3