Solar Control Circuit

As shown, the dual operational amplifier  LM358 and R1, R2, constitute two voltage comparators, voltage reference VDD (+12 V) 1/2. Photoresistor RT1, RT2 and potentiometer RP1 and photosensitive resistor RT3, of RT4 and potentiometer RP2, respectively, constitute the photosensitive sensing circuit of the special features of the circuit is to automatically compensate for the strength of the ambient light. As shown below, RT1 and RT3 vertical visor side of RT4 and RT2 installation on the other side. RT1, RT2, RT3 and RT4 as well as by the environment of natural light effect, the center of the RP1 and RP2 voltage unchanged. If only RT1, RT3 by sunlight, RT1 internal resistance decreases, the potential rise of LM358 3-foot, 1 foot high output, the transistor VT1 saturated conduction, conduction of the relay K1, the changeover contact contact 1 is closed, while the RT3 resistance decreases LM358 5-foot potential was decreased, the K2 does not convert contact with the stationary contact 2 is closed, the motor M is transferred; Similarly, if only RT2, RT4 by the sun rays, relay K2 conduction, K1, disconnect the motor M reversal. Go to both sides of the vertical sun visor surface illumination at the same time, the relay K1, K2, are guided through the motor M stopped turn. In the sun constantly offset process, the strength of the illumination on both sides of the vertical sun visor alternate motor M turn - stop, turn - stop the solar receiver is always facing the sun.

4 photoresistor such cross-arrangement advantages are: potential decrease the potential rise of LM358 3-foot, 5 foot, potential decrease the potential rise of LM358 5-foot, 3 feet, allows motor reversing the work of both simply another reliable. Can be directly used to install the circuit board doubles as a vertical shell visor, to avoid photosensitive resistor RT2, RT3 to the shelter of the shade of trouble. The use of the device, do not have to worry about its ability to automatically return the next morning. Morning when the sun rises on both sides of the vertical sun visor illumination can not be exactly equal, so that the control circuit will control the motor, thus driving the receiving device eastward rotation, until the solar receiver at the sun.