Electronics

light sensor

light sensor simply depends on the concept of voltage divider circuits and our transistor's gate reference point is connected between the variable resistance and LDR sensor and we connect the second terminal of the LDR to the ground so that we are reading the voltage of the LDR BUT if we want to reverse that function simply we could change the terminal of the LDR with the variable resistance "potentiometer " so it could work only at light 

 

 

 

when there is light

light sensor fritzing

light sensor


TIMER 555

The timer circuit it depends on the time of charging and discharging of the capacitor then after calculations we are using a suitable value of 220 ohms and 470 microfarad 

circuit diagram

hardware circuit

fritzing

timer


touch sensor

The idea of the touch sensor that when we touch the wire then there will be a path of current to the gate of the transistor then it works  

touch sensor

touch sensor


Dark sensor

Dark sensor simply depends on the concept of voltage divider circuits and our transistor's gate reference point is connected between the variable resistance and LDR sensor and we connect the second terminal of the LDR to the ground so that we are reading the voltage of the LDR BUT if we want to reverse that function simple we could change the terminal of the LDR with the variable resistance "potentiometer " so it could work only at light 

Dark sensor

circuit schematic