Can Wood Be Used as a Capacitive Sensor in an LM358 Op-Amp Circuit?

[hackhard]

i connected pin 4 and 8 to gnd and +5 v respectively
.when pin 2 touches wood, or hand pin 1 is high.
i understand skin is capacitive , but wood?

 

[CWatters]

Your circuit is badly designed so the output has no meaning. What about pin 3?

The output (pin 1) will be high if 1In- (pin 2) is lower than 1In+ (pin 3).

Static electricity on your skin or the wood can easily make pin 2 higher or lower than pin 3.

 

[davenn]

i connected pin 4 and 8 to gnd and +5 v respectively
.when pin 2 touches wood, or hand pin 1 is high.
i understand skin is capacitive , but wood?

quite an odd post
How about posting about what you are actually trying to achieve with this op-amp Dave

 

[sophiecentaur]

A circuit diagram helps everyone to understand what's being discussed. You can't expect every contributor to make a personal sketch.