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I have made an IR proximity sensor which works fine when an LED is connected.

This is the IR receiver and emitter part of the circuit. The white LED is connected to ground via a 270 ohm resistor and is connected to pin 1 (the output) of the LM358

Figure 1: This is the IR receiver and emitter part of the circuit. The white LED is connected to ground via a 270 ohm resistor and is connected to pin 1 (the output) of the LM358

I want to connect the output from pin 1 of the LM358 to an NE555 timer which is in astable mode (with a potentiometer) so the LED blinks whenever any object is near the IR sensor.

Could anyone please help me with setting up the NE555 timer in astable mode with a potentiometer?

here the led lights up when the pencil is senses by the ir proximity sensor

Figure 2: Here the LED lights up when the pencil is sensed by the IR proximity sensor

IR sensor schematic, to connect to the NE555

Figure 3: IR sensor schematic, to connect to the NE555

I have a 20 k potentiometer, please tell me how and what I need to connect to get a 1s or shorter time period for the blinking, whenever the IR sensor detects the proximity of an object.

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  • \$\begingroup\$ If you want us to look at this, please include the schematic. There's a schematic entry tool when you Edit your question. A photo of a hand-drawn schematic is also OK. \$\endgroup\$ Dec 14, 2020 at 8:46
  • \$\begingroup\$ @Bimpelrekkie i have included the schematic , from the pinout 1 , i want to connect it to NE 555 timer in astable mode with potentiometer adjuster of resistance , how should i do it , and is it possible , so i can make blinking leds ? \$\endgroup\$ Dec 14, 2020 at 9:05
  • \$\begingroup\$ Such a system will not work well as it will either have low sensitivity or suffer being activated by extraneous light. For good results you need to use a receiver looking for switched light at say 38 kHz and if it is a repurposed remote control receiver rather than a proximity one, you'll also need to key that on and off at a slower rate to satisfy the AGC. \$\endgroup\$ Dec 14, 2020 at 10:16
  • \$\begingroup\$ @ChrisStratton but it is working , i just wanna know how to connect its output yo ne555 for making blinking lights led ( astable mode of ne555 with potentiometer ) , the answer u have given is not relating to the problem mentioned by me . \$\endgroup\$ Dec 14, 2020 at 10:20
  • \$\begingroup\$ I did not post an answer, but rather a caution about what you will experience if you continue this particular path further into the future. You are of course free to continue to experiment with it. \$\endgroup\$ Dec 14, 2020 at 10:23

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