the circuit on the right is a darkness sensor while on the left is a motion detector using PIR. I want to combine these two circuits into one. The motion sensor must only function if the LDR detects darkness and it must not function if the LDR doesn't detect any darkness.

im making a school project, the circuit at the right is a darkness sensor using LDR and its steps and components are:
STEP 1 - Connect 555 timer IC on the breadboard
STEP 2 - Connect Pin 8 of 555 Timer to VCC of Battery
and Pin 1 of 555 Timer to GND of Battery
STEP 3 - Connect pin 4 to VCC and Connect pin 6 of 555 Timer to the pin 7 of 555 Timer
STEP 4 - Connect 330-ohm resistor to pin 7 and pin 8 of IC
STEP 5 - Connect 4.7uf polarized capacitor to pin 5 of IC and its negative side to the ground
STEP 6 - Connect 0.01uf ceramic capacitor to pin 6 of IC and its negative side to the ground
STEP 7 - Connect 4.7k ohm resistor on pin 2 of IC and its negative side to the ground
STEP 8 - Connect LDR to pin 2 and VCC
STEP 9 - Connect 470-ohm resistor to pin 3 of IC and connect its other side to the anode of the LED and its cathode to the ground
STEP 10 - Test if the circuit works

while the circuit on the left is a motion detector alarm using PIR (HC-SR501) and its steps and components are:
STEP 1 - Connect 555 timer IC on the breadboard and a 74HC04 IC
STEP 2 - Connect Pin 8 of 555 Timer to VCC of Battery
and Pin 1 of 555 Timer to GND of Battery. Also connect pin 14 of 74HC04 IC to VCC and pin 7 of 74HC04 IC to GND.
STEP 3 - Connect pin 4 to VCC and Connect pin 6 of 555 Timer to the pin 7 of 555 Timer
STEP 4 - Connect 100-kilo ohm resistor to pin 7 of 555 IC and its other side to the VCC
STEP 5 - Connect 4.7uf polarized capacitor to pin 7 of 555 IC and its negative side to the ground
STEP 6 - Connect 0.01uf ceramic capacitor to pin 5 of 555 IC and its negative side to the ground
STEP 7 - Connect a buzzer to pin 3 of 555 IC and its negative side to the ground
STEP 8 - Connect the pin 2 of 555 IC to pin 12 of 74HC04 IC
STEP 9 - Connect the GND of PIR to the ground, its power pin to the VCC and its Signal/output to the pin 13 of 74HC04 IC
STEP 10 - Test if the circuit works

do u have any suggestions on how we can merge the two circuit into one according to the said output?

 

Sorry, can't help without a complete schematic of the two circuits.
And you should never build a circuit without one, as schematics are the universal language of electronics.

 

Several things not correct.
The 9 step construction of the dark detector does not match the breadboard layout.
The .01 uf cap should be on pin5.
Don't need the 4.7uf cap or 330 ohm resistor.
Connect pin6 to pin2. No connection on pin7
This is all you need for a basic dark detector.
Additional components can be added to control the sensitivity and hysteresis.

 

The motion circuit looks OK.
To combine the 2 circuits connect pin4 of the motion detector circuit to pin3 of the dark detector. Do not connect pin4 of the motion to Vcc.

 

Sorry, can't help without a complete schematic of the two circuits.
And you should never build a circuit without one, as schematics are the universal language of electronics.

here’s the schematic of the circuit

 

do u have any suggestions on how we can merge the two circuit into one according to the said output?

Suggest a simpler configuration eliminating the 74HC04 chip.

 

Welcome to AAC.

Your thread has been moved to the Homework Help forum. Because AAC rules limit the sort of assistance members can provide with coursework to guidance on moving forward with a student’s own ideas. Because of this, all such posts must be made to the Homework Help forum.

It’s good to have you with us, and good luck with your project.

 

here’s the schematic of the circuit

No offense but that schematic is giving me a headache. I have redrawn both circuits as posted.
Definitely see a few issues. C2 for example.

 

yup, mentioned schematic was an abomination, no better than image of the bread board. circuits need to be drawn in a logical layout so one can follow the circuit function.

 

No offense but that schematic is giving me a headache. I have redrawn both circuits as posted.
Definitely see a few issues. C2 for example.
View attachment 295580

is this the same circuit as i posted?

 

is this the same circuit as i posted?

Yes

 

I enlarged and gave contrast to the horrible schematic then I uncrossed all its crossed wires:

 

I enlarged and gave contrast to the horrible schematic then I uncrossed all its crossed wires:

instead of 6y, i should use 4y?

 

the circuit on the right is a darkness sensor while on the left is a motion detector using PIR. I want to combine these two circuits into one. The motion sensor must only function if the LDR detects darkness and it must not function if the LDR doesn't detect any darkness.

im making a school project, the circuit at the right is a darkness sensor using LDR and its steps and components are:
STEP 1 - Connect 555 timer IC on the breadboard
STEP 2 - Connect Pin 8 of 555 Timer to VCC of Battery
and Pin 1 of 555 Timer to GND of Battery
STEP 3 - Connect pin 4 to VCC and Connect pin 6 of 555 Timer to the pin 7 of 555 Timer
STEP 4 - Connect 330-ohm resistor to pin 7 and pin 8 of IC
STEP 5 - Connect 4.7uf polarized capacitor to pin 5 of IC and its negative side to the ground
STEP 6 - Connect 0.01uf ceramic capacitor to pin 6 of IC and its negative side to the ground
STEP 7 - Connect 4.7k ohm resistor on pin 2 of IC and its negative side to the ground
STEP 8 - Connect LDR to pin 2 and VCC
STEP 9 - Connect 470-ohm resistor to pin 3 of IC and connect its other side to the anode of the LED and its cathode to the ground
STEP 10 - Test if the circuit works

while the circuit on the left is a motion detector alarm using PIR (HC-SR501) and its steps and components are:
STEP 1 - Connect 555 timer IC on the breadboard and a 74HC04 IC
STEP 2 - Connect Pin 8 of 555 Timer to VCC of Battery
and Pin 1 of 555 Timer to GND of Battery. Also connect pin 14 of 74HC04 IC to VCC and pin 7 of 74HC04 IC to GND.
STEP 3 - Connect pin 4 to VCC and Connect pin 6 of 555 Timer to the pin 7 of 555 Timer
STEP 4 - Connect 100-kilo ohm resistor to pin 7 of 555 IC and its other side to the VCC
STEP 5 - Connect 4.7uf polarized capacitor to pin 7 of 555 IC and its negative side to the ground
STEP 6 - Connect 0.01uf ceramic capacitor to pin 5 of 555 IC and its negative side to the ground
STEP 7 - Connect a buzzer to pin 3 of 555 IC and its negative side to the ground
STEP 8 - Connect the pin 2 of 555 IC to pin 12 of 74HC04 IC
STEP 9 - Connect the GND of PIR to the ground, its power pin to the VCC and its Signal/output to the pin 13 of 74HC04 IC
STEP 10 - Test if the circuit works

do u have any suggestions on how we can merge the two circuit into one according to the said output?View attachment 295492

Hi,

The description you gave of the circuit looks like it came straight out of the mouth of an ai bot.
Is this true?
Also, who made your schematic?

 

Hi,

The description you gave of the circuit looks like it came straight out of the mouth of an ai bot.
Is this true?
Also, who made your schematic?

yes i made it, i used tinkercad for the schematic

 

The motion circuit looks OK.
To combine the 2 circuits connect pin4 of the motion detector circuit to pin3 of the dark detector. Do not connect pin4 of the motion to Vcc.

what connection should i do with the 5V voltage regulator so that if i use a 9V battery my circuit will work? as you can see in the schematic and in the picture, only the left part of the circuit works when it detect darkness, the right circuit won't work especially when the pir sensor detects motion,the buzzer is not buzzing

 

Why do you need the 5 volt regulator?

 

Why do you need the 5 volt regulator?

because the supply voltage of 74HC04 is only until 5V and we are only allowed to use a 9V battery

 

You don't need the 74HC04 either.

 

You don't need the 74HC04 either.

i already fixed it, thank you so much for your help!!