Back to firefly

Measuring LDR - Resistor ratio

*Breadboard and components, this circuit will control the firefly light

*The (3 volts) voltage (+) is connected to a resistor (currently, I am using 5kΩ resistor)

*The 5kΩ resistor is connected to an LDR and another resistor (the second resistor is 100Ω resistor)

*The LDR is connected to the (3 volts) voltage (-)

*The 100Ω resistor is connected to the base of a transistor

*The emitter of the transistor is connected to the firefly circuit (-)

*The collector of the transistor is connected to another (3 volts) voltage (-)

*The 2nd (3 volts) voltage (+) is connected to the firefly circuit (+)

*Both the collector of the transistor and the 2nd (3 volts) voltage (-) are connected to the 1st (3 volts) voltage (-)

*Both power supplies must be common ground

*Using a 5kΩ resistor and an LDR

*When the LDR detects a light, the light goes dimmer

*Using a 5kΩ resistor and an LDR

*When the LDR detects no light, the light goes brighter

*Light effect on the body of a firefly