Senors And Logic Gates Flashcards
What does pwm stand for
Pulse width modulation
What is the use of pwm
Allows control to be more accurate by using small bursts
What can silicone be doped with
Boron and phosphorus
When silicone is doped with boron is it positive or negative
Positive as it has a spare electron on outer shell
What is a forward base diode
Only allows electrons to flow from negative to positive
What is a reverse bias diode
It only allows flor of electrons from positive to negative
What is a pnp transistor
It points in permanently
What is a npn transistor
It never points in
What is a Darlington pair
It is 2 diodes which amplify voltage
What is a not gate
It is when the output is not the same as the input and it is a triangle
What is an and gate
It is a gate which only works when both are on and it is a mushroom shape
What is an or gate
It is (either or) either and both will make the gate work looks like a spear head
What is a Nand gate
Is a gate which works until both are on
Nor gate
Only works when both are off
What is a knock sensor
It detects seismic shift through the use of piezo crystals, this is used to detect pre ignition
What is a map sensor
It is a manifold absolute pressure sensor
It is an active sensor, the diagram flexes onto the piezo crystals.
What is a Hall effect sensor
It is used as an on and off sensor uses square waves
What is an mre sensor
Magnet resistant element
It is in theory 2 Hall effect sensors it is used to detect direction eg steering angle sensors or throttle position
What is a temperature sensor
It used resistors to create signal
What does positive coefficient mean
As temperature increases, the resistance increases
What can effect speed sensors
Proximity, speed of wheel, and strength of magnet
Is a map sensor an active sensor
Yes and it is type of strain gauge
Is a Hall effect sensor measured in square waves ?
Yes it is
How many wires are there in a Hall effect sensor
3 power ground and signal
