Hi my names Ryan just registered into the forums. Im currently in an electrical engineering program and was hoping to get some help with understanding various concepts that im honestly new to. (so excuse what may seem like very very elementary questions).
Im having a bit of trouble understanding pull up and pull down resistors. Specifically, why are they needed within the context of switches..so far I understand that from a switch we can output 1s and 0s for instance a switch in its normal down position is a 0 (or 1 if we invert right?) and has some associated voltage (i believe in our class the 2 assoc. volts are 0 or +5V). So basically what exactly does a PU and PD resistor do? Is it simply to give definition to a floating wire to our wanted designation of either being 1 or a 0?
Also when a switch is open and not touching the contact that means we have a floating wire yes? and then we MUST use a PD or PU resistor if we want to define a 1 or 0?
I've said a lot so I'll stop there and hopefully someone can field in some of my questions. Like I said im in the first year of this program and these questions are probably really dumb but unfortunately the prof of this specific course has confusing notes and goes at an unbelievable pace.....
Thanks in advance!
Im having a bit of trouble understanding pull up and pull down resistors. Specifically, why are they needed within the context of switches..so far I understand that from a switch we can output 1s and 0s for instance a switch in its normal down position is a 0 (or 1 if we invert right?) and has some associated voltage (i believe in our class the 2 assoc. volts are 0 or +5V). So basically what exactly does a PU and PD resistor do? Is it simply to give definition to a floating wire to our wanted designation of either being 1 or a 0?
Also when a switch is open and not touching the contact that means we have a floating wire yes? and then we MUST use a PD or PU resistor if we want to define a 1 or 0?
I've said a lot so I'll stop there and hopefully someone can field in some of my questions. Like I said im in the first year of this program and these questions are probably really dumb but unfortunately the prof of this specific course has confusing notes and goes at an unbelievable pace.....
Thanks in advance!