Implement state machine without using MCU

Thread Starter

rbgautam

Joined Nov 22, 2014
1
I want to implement a simple lighting circuit, which moves from one state to another using a simple momentary switch. The modes are as follows:
Bright mode -> Dim Mode -> Strobing mode -> Off

I want to use only one switch and minimum of components.
 

Roderick Young

Joined Feb 22, 2015
408
That's exactly the behavior of our TechLite Lumen Master flashlight. Maybe there is a mass-produced flashlight chip that you can buy, or you can harvest the circuit from a flashlight?

Alternatively, why not use an MCU? A simple one like a PICAXE 08M2 is capable of doing what you want, including debouncing the pushbutton. Not that hard to learn, and trivial to program (you just use BASIC). Comes in an 8-pin DIP, that's pretty simple and small. No external oscillators. About all you would need is an external pass transistor to handle the current of your LED.
 

PeterCoxSmith

Joined Feb 23, 2015
148
Use a 4 stage ring counter circulating 1000. Clock with the switch, with debounce. Enable each mode by one-hot state.
 
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