need a filter to an infrared distance sensor
Hello,
i'm trying to make an infrared distance sensor for a project so i find a simple CKT on the attachement but it need some improvment
i want to integrate with it a high pass filter to avoid noise for ex to let only 40khz frequency to pass but i'm not familiar with filter so i need your help
and this ckt detecte only for 1 - 7 cm if you can improve it to get higher distance like 10 or 15 cm it will be better
so if you have any sugestion thank you for replaying back
and sorry for my bad english