24000
Ohms

500
Ohms

VR1
Variable
Resistor
Value

Circuit Diagram
Adjusting the LDR Voltage Divider Circuit

 

 

0.2
Variable Resistor
Variable Resistor Adjustor

Move the arrow pointer to set the brightness & see the LDR resistance and voltage values change

Vertical slider


.
Move the arrow pointer below to change the resistance of VR1 & set the transistor 0.7v "switch on" point.

LDR Sensor
Resistance
Value

 

Variable Resistor
  
Multimeter
Full Sunshine
Night Time zzzzzz
Cloudy and Overcast
LDR

VLDR
(Voltage seen
across LDR
and on
base input (b)
of transistor Tr1)

FastTrack pcb