For a recent school project, I came up with the idea of making a circuit which monitors bike pedal rpm (Cadence). Essentially spinning at an rpm of 90 will grow muscle that burns fat instead of short term energy.
The circuit I have designed is attached.
The input will be from an infrared phototransister that will pulse high each revolution.
I basically need to convert frequency into voltage which will then be used along side some comparators to turn some LEDs on that will be mounted on the handlebars. (I will probably also use a 3 to 8 decoder)
It will have to run on no more than 9v.
I know the circuit doesn't look pretty etc but I just need to get it functional first.
There are probably chips that will do all this for me but that would defeat the object of the project.
Help appreciated.
The circuit I have designed is attached.
The input will be from an infrared phototransister that will pulse high each revolution.
I basically need to convert frequency into voltage which will then be used along side some comparators to turn some LEDs on that will be mounted on the handlebars. (I will probably also use a 3 to 8 decoder)
It will have to run on no more than 9v.
I know the circuit doesn't look pretty etc but I just need to get it functional first.
There are probably chips that will do all this for me but that would defeat the object of the project.
Help appreciated.