555 contest entry: Electric field motion sensor

Motion Sensor using the NE555 responding to changes in electric field.
http://www.elektronik-labor.de/Notizen/555LEDeng.html

Category:

Science & Technology

Tags:

• NE555
• vontest
• entry

[sokolovmech]

Hi! I have a question. I tried this circuit, and it does work, but its not sensing motions but it only works just like a touch panel. I don't know if the current is the problem, I used a 9v battery with a resistor to make it 6v. I really need your help, thanks :)

[bkelektronik]

@sokolovmech This could be due to 50 Hz or 60 Hz mains signals. It depends on the place and if there are power lines in the near. Using a scope you could find the detected signals at the collektor of the transistors. If the main signal comes mostly from static electric charge the signal depends on the motion. The amount of charge depends also on the shoes an ground materials.

[2012goingNutz]

pretty cool, you used transistors PNP or NpN? You hacked off the middle pin? You are using them like resistors? Im an idiot so try and keep it simple for me :O)

[stevenchiverton48]

@sokolovmech i tried this circiut to and it dident work iether the biulder of this circiut probably had it going cause the field of his own body way probably allready enhanced by an allready existing freild in the air from an unknown source and the circiut is tapping into it at the right frenquency .