lec 4.2 Flashcards
what does a capacitor have
two conductive surfaces, or electrodes,
one positive one to ground
what is a capacitor similar to
similar to small battery can be both charged
and discharged very quickly
how can you measure the capacitor charge and discharge time
by script in the library ‘CapacitiveSensor’
how can you create a sensitive input circuit
select 2 pins on the digital I/O port
One pin will output 5 volts through a 1MΩ resistor
other pin will be used as an input to sense charge and discharge times
what happens when send pin changes voltage
it will change the voltage on the receive
pin.
why is it desirable to add an additional small
capacitor (20 - 400 pF) in parallel with the body capacitance
it improves both the stability and repeatability of the circuit
which digital I/O ports can be used when using pinMode() function
Any 2 pins can be used
what one parameter is required for capacitive sensor
the number of samples to take, and returns
a long data type
how to re-calibrate interval with function
by function: CS_Autocal_Millis()
