Page 26 - RoboGenius Pro C7

STEP - 9 Place the NPN transistor on the breadboard in rows 23-25 (row 23 - Collector, row
24 - Base, row 25 - Emitter).

STEP - 10 Connect a jumper wire from row 14, column i (where the cathode of the LED is
connected) to row 23, column i (the collector (C) pin of the NPN transistor).

STEP - 11 Connect a jumper wire from row 3, column g to row 24, column g (the base (B) pin
of the NPN transistor).

STEP - 12 Connect a jumper wire from row 2, column f to row 25, column f (the emitter (E) pin
of the NPN transistor).

STEP - 13 Connect a jumper wire from row 25, column h to the negative rail on the breadboard.

STEP - 14 Connect a jumper wire from row 7, column j to the positive rail on the breadboard.

STEP - 15 Click on the Start Simulation button to test the circuit.

The LED will automatically turn on when the surrounding light is low (when the photoresistor
detects darkness) and turn off when the light is bright. This confirms that the photoresistor is
sensing light levels and controlling the LED accordingly.

ECOTECH Solar-Powered Outdoor Lights use photoresistors to turn on automatically when it gets dark,
ENERGY conserving energy.

RoboGenius Pro - VII
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