Hi all
im doing a project for my car which has different sensors going into a 16f876a pic and displaying them on a lcd display, my problem is i dont have a speed sensor but i do have a unused abs wheel sensor which pics up on a 32 tooth ring on the drive shaft.
the abs sensor has two wires and produces a ac signal as the toothed ring rotates in front of it
the problem is that the voltage produced increases from 0 to 300v as the frequancy ie wheel speed increases.(frequany could be as high as 1khz)
i was looking to use a schmitt trigger to change the sine wave to a 5v square wave.
how would i connect the abs sensor and also how would i stop the sine wave voltage getting to high that it damages the schmitt trigger, i need to do this with out effecting the frequancy.
iv attached the schmitt layout i plan to use
im doing a project for my car which has different sensors going into a 16f876a pic and displaying them on a lcd display, my problem is i dont have a speed sensor but i do have a unused abs wheel sensor which pics up on a 32 tooth ring on the drive shaft.
the abs sensor has two wires and produces a ac signal as the toothed ring rotates in front of it
the problem is that the voltage produced increases from 0 to 300v as the frequancy ie wheel speed increases.(frequany could be as high as 1khz)
i was looking to use a schmitt trigger to change the sine wave to a 5v square wave.
how would i connect the abs sensor and also how would i stop the sine wave voltage getting to high that it damages the schmitt trigger, i need to do this with out effecting the frequancy.
iv attached the schmitt layout i plan to use