## Fritzing

Fritzing is a freely downloadable circuit editor and electronic design automation application produced by staff and students from the Interaction Design Lab at the University of Applied Sciences in Potsdam, Germany. It allows electronic circuits to be created and...

## plcLib (Arduino): Inputting from a Keypad

Previous: Edge Triggered Pulses Contents Next: Using Time Delays A matrix keypad may be used as an input device, allowing PLC outputs to be turned on or off when particular keys are pressed. To illustrate the concept, a standard membrane keypad will be used, together...

## Venn Diagrams and Boolean Algebra

A Venn diagram may be used to represent the possible logical states of a combinational logic system, typically having up to 3 input variables. Venn diagrams with more than 3 input variables becoming increasingly difficult to draw, given that for N variables, there...

## Permeability

Absolute Permeability (μ) is the ratio of magnetic flux density (B) to magnetic field strength (H). Hence, For a non magnetic material, the ratio of B/H is a constant. The permeability of a classical vacuum (an 'ideal' vacuum, neglecting quantum mechanical effects)...

## Conductance

The reciprocal of resistance (R) is conductance (G), which is measured in siemans (S). Hence: Worked Example 1 Find the conductance of a conductor of resistance 27 Ω. Show / hide answer G = 1 / R = 1 / 27   = 0.037 S = 37 mS Worked Example 2 Find the...