This is the probe touching +5 volts (logical 1, TRUE). The LED is bright.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjLKUHjt_PQGGjhYbuGqXWuzxIb3_0gRKkdSWoOlm2jDUnHqmyNqG0a7u1D6zigOpJcpBCToNAJefzwVNYTV8bpo7tLZ0goTCSCoJETyOkFjXzO6QNTJje3DtlbI9ju639Kfeq24-EL6zE/s320/Breadboard+Logic+Probe+Logic+High.gif)
This is the logic probe touching nothing. The LED glows dimly..
Here the probe touches 0 volts (logical 0, FALSE, common, ground). The LED is dark.Bottom view of the assembled probe. A drop of hot glue was added later to hold the power clips to the board. The probe is made from a paper clip.
Top view of the assembled probe.
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