Bi Directional Visitor Counter circuit has problem | Microcontroller › 8051 › Bi Directional Visitor Counter circuit has problem This topic has 1 reply, 1 voice, and was last updated 12 years, 7 months ago by Amrita. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts February 1, 2012 at 5:42 pm #1691 AmritaParticipant The project of automatic bi-directional visitor counter has lots of issues. 1. The LM358 shown on the circuit : shows 2&3 as input but out put is taken from pin-7, it should be pin-1. 2. In the circuit P1.5 & 1.6 are shown for up and down, wheras in the code P3.5 & 3.6 are used. February 1, 2012 at 5:44 pm #7099 AmritaParticipant also it assumes that when there will be an obstruction between IR-TX & IR-RX the output will be high, which is wrong, the output from OPAMP will be low. Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In