Hi I hope someone can help me with this
I am tray to make phototransistor to detect if someone walk in and out the door
to connect to up/down counter
I will start with the phototransistor the counter I will thing about later
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I have up/down counter but I need to replace the button with phototransistor but the only problem with the counter is
I need to press button to change if I want to count up or down
so when I walk in the door the phototransistor press the button to count up or down and the he press the button to count
so best if I can find how to make up/down counter I don't need to press button to select if I want to count up or down
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I hope someone have sample of phototransistor Schematic Please it need to be in the door
Regards
Sigster