Greetings everyone!
I am a long time lurker but a first time poster in need of guidance on something that I've been conceptualizing. (Mods feel free to move this thread if I am posting this in the wrong area)
I am looking for a low-tech method to detect the difference between a 1K resistor, a 2K resistor, and a 2.2K resistor without using a meter. I was thinking of building some sort of box with 3 LED's where each light would correspond to the amount of resistance detected.
So if the resistance is 999 ohms or less, none of the lights should illuminate. If the resistance is greater than 999 ohms but less than 2000 ohms, the first light should illuminate. Greater than 2000 ohms but less than 2199 ohms, the second light should illuminate and so on.
Just to give you some background on what I'm doing, I install alarm systems and sometimes the resistors are out 'in the field' next to the door contact sensors. Rather than pulling the sensors out to read the color bands, I'd like to build a tool like this one to determine if it is one of the common resistor sizes that is used on most alarm systems.
Ideally I'd like to make the led illumination isolated from all of the other lights, however, I wouldn't be opposed to the lights illuminating in succession.
Thanks!
I am a long time lurker but a first time poster in need of guidance on something that I've been conceptualizing. (Mods feel free to move this thread if I am posting this in the wrong area)
I am looking for a low-tech method to detect the difference between a 1K resistor, a 2K resistor, and a 2.2K resistor without using a meter. I was thinking of building some sort of box with 3 LED's where each light would correspond to the amount of resistance detected.
So if the resistance is 999 ohms or less, none of the lights should illuminate. If the resistance is greater than 999 ohms but less than 2000 ohms, the first light should illuminate. Greater than 2000 ohms but less than 2199 ohms, the second light should illuminate and so on.
Just to give you some background on what I'm doing, I install alarm systems and sometimes the resistors are out 'in the field' next to the door contact sensors. Rather than pulling the sensors out to read the color bands, I'd like to build a tool like this one to determine if it is one of the common resistor sizes that is used on most alarm systems.
Ideally I'd like to make the led illumination isolated from all of the other lights, however, I wouldn't be opposed to the lights illuminating in succession.
Thanks!