labyrinth02 Posted June 2 Report Share Posted June 2 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? Quote Link to comment Share on other sites More sharing options...
HarryA Posted June 2 Report Share Posted June 2 You need to supply schematic diagrams for the two circuits. If you need help with creating schematics ask. Quote Link to comment Share on other sites More sharing options...
loribennms Posted June 5 Report Share Posted June 5 On 6/2/2023 at 5:23 AM, labyrinth02 said: 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? epoxy flooring dallas Combining the darkness sensor circuit and the motion detector circuit into one requires integrating the functionalities of both circuits. Here's a possible approach to achieve the desired output: Start by connecting the power and ground connections for both circuits to a common power source, ensuring they share the same ground reference. Connect the LDR (darkness sensor) to pin 2 of the 555 timer IC from the darkness sensor circuit. This connection will determine whether the motion detector should be enabled or not based on the darkness level. Connect the output signal pin (pin 13) of the PIR motion sensor to an input pin of the 555 timer IC (e.g., pin 12). This connection will provide the motion detection signal to the combined circuit. Determine which output you want to trigger based on the conditions (darkness and motion). You can use any available output pin on the 555 timer IC for this purpose. Use logical gates (such as AND or NAND gates) to combine the darkness sensor input and the motion sensor input. Connect the LDR output to one input of the gate and the PIR output to the other input of the gate. The output of the gate will be connected to the chosen output pin of the 555 timer IC. Ensure that the chosen output pin is connected to the desired output device (e.g., LED, buzzer, etc.) through appropriate resistor values. Test the combined circuit to verify if it functions as intended. Make any necessary adjustments or optimizations based on the desired behavior. Please note that this is a generalized approach, and the specific implementation may depend on the available components and circuit requirements. It's recommended to have a good understanding of circuit design and the datasheets of the components used to ensure correct connections and proper functioning. Quote Link to comment Share on other sites More sharing options...
bidrohini Posted June 15 Report Share Posted June 15 I think it will be much easier if you switch to Arduino. You will need to connect the PIR output to a digital pin. You will also need to conenct the LDR to an analog pin of the Arduino. By using the digitalRead and analogRead functions you can read the PIR and LDR sensor outputs. Then you can connect to the Arduino and turn on a relay/led/buzzer whatever you wish to control. https://www.theengineeringprojects.com/2017/08/pir-sensor-arduino-interfacing.html https://www.hackster.io/electronicsfan123/interfacing-arduino-uno-with-ldr-8760ba Quote Link to comment Share on other sites More sharing options...
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