Hello,
This is my first post here and at initial glances, this website seems like an amazing resource.
I need help with a very simple LED timer circuit.
I am making a collection box for my GCSE Design & Technology course. I want to make it so that when money is inserted into the hole, it will press down a copper contact that will complete the circuit and light up six blue LEDs.
Because the money falls into the box right away, the circuit will be broken in less than a second as the copper contact will spring back into place. However, I want the LEDs to remain turned on so that they illuminate the 'thank you' sign for at least 10 seconds in order for the donor to notice it.
I do not know where to take it on from here. I want to use a 9 or 12 V battery as the power supply and 6 blue LEDs (that I am told require 5mA).
I initially thought I could use a capacitor to store the energy and release it to the LEDs for 10 seconds. Do you'll think this is viable? If so would it be possible to point me in the right direction in terms of calculating the measurements because I haven't had any luck? (I've been told I may also need a resistor to protect the capacitor.)
Alternatively, I was told that I could use a time-delay circuit but I have no idea where to begin with that. Would you advice me to take this option, if so can you guide me to any good resources?
Furthermore, are there any other routes I can use to complete this circuit?
Thank You So Much,
Muhammad K
This is my first post here and at initial glances, this website seems like an amazing resource.
I need help with a very simple LED timer circuit.
I am making a collection box for my GCSE Design & Technology course. I want to make it so that when money is inserted into the hole, it will press down a copper contact that will complete the circuit and light up six blue LEDs.
Because the money falls into the box right away, the circuit will be broken in less than a second as the copper contact will spring back into place. However, I want the LEDs to remain turned on so that they illuminate the 'thank you' sign for at least 10 seconds in order for the donor to notice it.
I do not know where to take it on from here. I want to use a 9 or 12 V battery as the power supply and 6 blue LEDs (that I am told require 5mA).
I initially thought I could use a capacitor to store the energy and release it to the LEDs for 10 seconds. Do you'll think this is viable? If so would it be possible to point me in the right direction in terms of calculating the measurements because I haven't had any luck? (I've been told I may also need a resistor to protect the capacitor.)
Alternatively, I was told that I could use a time-delay circuit but I have no idea where to begin with that. Would you advice me to take this option, if so can you guide me to any good resources?
Furthermore, are there any other routes I can use to complete this circuit?
Thank You So Much,
Muhammad K