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Arduino Tutorial #3 - Shift Registers (74HC595) Video Lecture - Drones
FAQs on Arduino Tutorial #3 - Shift Registers (74HC595) Video Lecture - Drones for Beginners
| 1. What is a shift register and how does it work? |  |
Ans. A shift register is an integrated circuit that allows you to expand the number of digital outputs of your Arduino. It works by converting serial data into parallel data, allowing you to control multiple outputs with only a few pins on your Arduino.
| 2. What is the 74HC595 shift register? | |
Ans. The 74HC595 is a commonly used shift register IC. It has 8 outputs, which can be individually controlled using only 3 pins from the Arduino. It also has a serial input and a serial output, allowing you to chain multiple shift registers together to control even more outputs.
| 3. How do I connect a 74HC595 shift register to an Arduino? | |
Ans. To connect a 74HC595 shift register to an Arduino, you need to connect the following pins: - Connect the Arduino's digital pin to the shift register's data input pin (DS). - Connect the Arduino's digital pin to the shift register's clock input pin (SH_CP). - Connect the Arduino's digital pin to the shift register's latch input pin (ST_CP). - Connect the shift register's output pins (Q0-Q7) to the desired output devices (LEDs, motors, etc.).
| 4. How do I program a 74HC595 shift register with Arduino? | |
Ans. To program a 74HC595 shift register with Arduino, you need to use the shiftOut() function. First, you need to set the latch pin (ST_CP) low. Then, you can use the shiftOut() function to send the data you want to output to the shift register. Finally, you set the latch pin high to update the outputs. Repeat this process for each set of data you want to send.
| 5. Can I daisy-chain multiple 74HC595 shift registers? | |
Ans. Yes, you can daisy-chain multiple 74HC595 shift registers to control more outputs. To do this, you need to connect the serial output (Q7) of one shift register to the serial input (DS) of the next shift register. This allows you to control multiple shift registers using the same 3 pins on the Arduino.
Text Transcript from Video
how's it going guys welcome to the
turret Arduino tutorial in which we're
going to look at a very interesting
device which is a shift register and in
our case it's going to be the 74 HC 595
as you can see on the screen so what
does IC does is that it it is able to
shift multiple outputs so by using three
pins on the Arduino we're able to
control eight LEDs and to just give you
an idea of what this IC can do you have
a small scrolling example for the eight
LEDs on my breadboard for this
particular tutorial you're going to need
an IC so a shift register the one that
I'm using I'm going to link for to the
datasheet down below you can buy it
almost anywhere Sparkfun amazon ebay
digi-key now you're going to need some
jumper wires as you can see I have a lot
of them on my breadboard you're going to
need some current limiting resistors
which we've discussed in a previous
video going to need a bunch of LEDs and
these are just very basic abilities and
you're going to need a breadboard as
well as your Arduino without any further
delay let's take a look at datasheet for
Ric alright so here's the data sheet for
our 74 hc5 95 shift register and as you
can see we can find a bunch of valuable
information I'm going to post this link
down in the video if you want to get a
more detailed view you get all the pin
outs you get the layout for our device
which pin goes where but more
importantly we get a description for
every pin so as you can see we have
these are q1 q2 through q7 those are the
pins that we're going to use to light up
two LEDs
actually it starts with Q 0 which is on
the other side of the IC versus all the
other ones but we got these
these function descriptions within this
table which are going to allow us to
basically configure the device as we
want and you will see later on how we're
going to program this based on these but
in a nutshell what you want to do is
look at these different functions and
the side of what you want to do or what
what you need the device to do so in
this case we would like to shift a value
so in this case they're setting on input
of high into the shift register and as
you can see it says contents of all
shift register stages are shifted
throughout which means that basically
you're cascading each element into the
next one and shifting a new one into the
shift register also the very important
function is as you can see contents of
shift registers are transferred to the
storage register and parallel output
stages what that means is you have
shifted in your values at this stage but
you need to out actually instruct the
device to output what you want so
basically the final result to light up
the LEDs and the way this table works as
you can see they have a description of
what's going on so here it's if you go
from low to high voltage on your sh c P
pen and you're going to keep these as
they describe you're going to execute
this function and in this case if you go
from low to high on the sdcp pen you're
going to execute this instruction so
this is obviously very important it's
going to play an important role and the
programming for this device lastly what
else do we want to see umm also from
this diagram we can notice that the
enable pen is basically just allowing us
to either display the basically have an
output or not have an output also the mr
the master reset pin has to be
has to be constantly high for us not to
reset the values completely so those two
pins could just be a a set value in our
case and we don't need to worry about
them so and on essentially we're going
to be using three Arduino pins to
control eight outputs or eight LEDs in
this case all right so let's start
writing the software all right so let's
start defining our three pins the first
one is going to be the GS bin vs pin
let's set it up on pin 8 of the Arduino
and SD CP and once again all these pins
are defined in the in the datasheet so
if you want to reference anything back
and see what they do for yourself feel
free we are going to declare our setup
so this is as usual you always have to
do this for the Arduino pin mode all of
these pins are going to be outputs
obviously
I'll put
this TCP HTTP we're going to declare a
function so right reg function we're
also going to set up a registers array
of eight since we're going to have eight
pins what else
so let's declare our function right reg
okay so in this function what we're
going to start with is did it digital
right this hcp and too low what this
does is we're going to start basically
initializing all of our registers one by
one so we're going to set the spin to
low
we're going to declare a four function
in which we're going to declare I is
equals to 7 so we're going to insert
register I mean register values in a
reverse order to zero
- so in this for loop we're going in
this for loop we're going to shift in
the value that we have stored in the
registers array one by one so in order
to do that we will start by by a digital
right of the sdcp
and lo we're going to write the value of
the register so in this case digital
right the s10 and here we're going to
pull the value of the register so right
registers
I and then the drill right stcp
and - hi
so as you can see we're creating the
soil low to high transition here so sdcp
goes low and stcp goes high and this is
this is what I mentioned in the
datasheet that we're trying to get the
transition to call that basically
function of the IC and we're going to
close the function with a sh CP n - hi
so once again anything in between these
two you get the transition of the SHC
peepin from low to high so this is going
to basically save our values and output
them onto the register so as always void
loop get open close and in our case I
mean I created a a very simple double
for loop which will cascade the LEDs so
let's just do that into a equals zero I
smaller than nine PI plus plus
within the for loop what I'm doing
particularly is declaring registers hi
one-by-one so it just there's AI is
equal to hi followed by a delay follow
registers sorry right right so our
function which is going to write the set
registers and another for loop which is
going to be int I equals 8 so obviously
you want to reverse the LEDs so to make
that like wave pattern I bigger than 0 I
plus plus then close just close up close
the for loop ok and here it's going to
be basically the opposite so registers I
low delay 100 and right the register see
if we get any errors
digitalwrite rates go okay so that works
let's upload it to the Arduino and we're
going to take a look at what we've got
all right so I just wanted to take a
look at the circuit that I've built and
sort of explain what's actually going on
so as you can see on the right we have
the the IC and we have the connections
that are made to the Arduino so
obviously your VCC or ground you have to
connect them so ground VCC the master
reset as I explained earlier has to be
pulled high in order for us not to
basically clear the register the
register so that's just permanently
pulled up dependents grounded is here
it's the enable and if you look in the
datasheet it's an inverted pin so that's
why it's grounded it's instead of pulled
up but in reality it's actually being
pulled up inside the shift register all
the other the other eight q q0 2 Q 7
pins are connected to an LED through a
current limiting resistor and I've
explained the cauda calculated these
values before so if you want reference
those tutorials the pins 8 9 10 are our
well Arduino pins 8 9 10 are connected
to SH CPS t CP and the des pins so we're
inputting the register value through the
d s pen and we're toggling these inputs
in order to perform certain functions
described in the upper in the datasheet
for this device so let's take a look at
the actual circuit and how it performs
alright so as you can see the breadboard
circuit we have all our this is q0 let's
go into the first LED and this is q1
through Q 7 which goes to beach LED
they're all plugged in with the
series resistor and all of them are
grounded just like I explained it in the
schematic we got power and ground going
to the Arduino board so the white wire
here it's the ground the red is the
power and we have three control wires
going back to the Arduino pins eight
nine and ten and as you can see we are
shifting through our LEDs and they're
going up one by one then going down just
like we were all in the software so feel
free to modify the software showcase
what you've got let me know if you have
any questions make sure to comment
subscribe that would be very helpful and
let me know what you what else you would
like me to make in the following
tutorials thank you guys very much
hopefully you enjoyed this third
tutorial Thanks bye
turret Arduino tutorial in which we're
going to look at a very interesting
device which is a shift register and in
our case it's going to be the 74 HC 595
as you can see on the screen so what
does IC does is that it it is able to
shift multiple outputs so by using three
pins on the Arduino we're able to
control eight LEDs and to just give you
an idea of what this IC can do you have
a small scrolling example for the eight
LEDs on my breadboard for this
particular tutorial you're going to need
an IC so a shift register the one that
I'm using I'm going to link for to the
datasheet down below you can buy it
almost anywhere Sparkfun amazon ebay
digi-key now you're going to need some
jumper wires as you can see I have a lot
of them on my breadboard you're going to
need some current limiting resistors
which we've discussed in a previous
video going to need a bunch of LEDs and
these are just very basic abilities and
you're going to need a breadboard as
well as your Arduino without any further
delay let's take a look at datasheet for
Ric alright so here's the data sheet for
our 74 hc5 95 shift register and as you
can see we can find a bunch of valuable
information I'm going to post this link
down in the video if you want to get a
more detailed view you get all the pin
outs you get the layout for our device
which pin goes where but more
importantly we get a description for
every pin so as you can see we have
these are q1 q2 through q7 those are the
pins that we're going to use to light up
two LEDs
actually it starts with Q 0 which is on
the other side of the IC versus all the
other ones but we got these
these function descriptions within this
table which are going to allow us to
basically configure the device as we
want and you will see later on how we're
going to program this based on these but
in a nutshell what you want to do is
look at these different functions and
the side of what you want to do or what
what you need the device to do so in
this case we would like to shift a value
so in this case they're setting on input
of high into the shift register and as
you can see it says contents of all
shift register stages are shifted
throughout which means that basically
you're cascading each element into the
next one and shifting a new one into the
shift register also the very important
function is as you can see contents of
shift registers are transferred to the
storage register and parallel output
stages what that means is you have
shifted in your values at this stage but
you need to out actually instruct the
device to output what you want so
basically the final result to light up
the LEDs and the way this table works as
you can see they have a description of
what's going on so here it's if you go
from low to high voltage on your sh c P
pen and you're going to keep these as
they describe you're going to execute
this function and in this case if you go
from low to high on the sdcp pen you're
going to execute this instruction so
this is obviously very important it's
going to play an important role and the
programming for this device lastly what
else do we want to see umm also from
this diagram we can notice that the
enable pen is basically just allowing us
to either display the basically have an
output or not have an output also the mr
the master reset pin has to be
has to be constantly high for us not to
reset the values completely so those two
pins could just be a a set value in our
case and we don't need to worry about
them so and on essentially we're going
to be using three Arduino pins to
control eight outputs or eight LEDs in
this case all right so let's start
writing the software all right so let's
start defining our three pins the first
one is going to be the GS bin vs pin
let's set it up on pin 8 of the Arduino
and SD CP and once again all these pins
are defined in the in the datasheet so
if you want to reference anything back
and see what they do for yourself feel
free we are going to declare our setup
so this is as usual you always have to
do this for the Arduino pin mode all of
these pins are going to be outputs
obviously
I'll put
this TCP HTTP we're going to declare a
function so right reg function we're
also going to set up a registers array
of eight since we're going to have eight
pins what else
so let's declare our function right reg
okay so in this function what we're
going to start with is did it digital
right this hcp and too low what this
does is we're going to start basically
initializing all of our registers one by
one so we're going to set the spin to
low
we're going to declare a four function
in which we're going to declare I is
equals to 7 so we're going to insert
register I mean register values in a
reverse order to zero
- so in this for loop we're going in
this for loop we're going to shift in
the value that we have stored in the
registers array one by one so in order
to do that we will start by by a digital
right of the sdcp
and lo we're going to write the value of
the register so in this case digital
right the s10 and here we're going to
pull the value of the register so right
registers
I and then the drill right stcp
and - hi
so as you can see we're creating the
soil low to high transition here so sdcp
goes low and stcp goes high and this is
this is what I mentioned in the
datasheet that we're trying to get the
transition to call that basically
function of the IC and we're going to
close the function with a sh CP n - hi
so once again anything in between these
two you get the transition of the SHC
peepin from low to high so this is going
to basically save our values and output
them onto the register so as always void
loop get open close and in our case I
mean I created a a very simple double
for loop which will cascade the LEDs so
let's just do that into a equals zero I
smaller than nine PI plus plus
within the for loop what I'm doing
particularly is declaring registers hi
one-by-one so it just there's AI is
equal to hi followed by a delay follow
registers sorry right right so our
function which is going to write the set
registers and another for loop which is
going to be int I equals 8 so obviously
you want to reverse the LEDs so to make
that like wave pattern I bigger than 0 I
plus plus then close just close up close
the for loop ok and here it's going to
be basically the opposite so registers I
low delay 100 and right the register see
if we get any errors
digitalwrite rates go okay so that works
let's upload it to the Arduino and we're
going to take a look at what we've got
all right so I just wanted to take a
look at the circuit that I've built and
sort of explain what's actually going on
so as you can see on the right we have
the the IC and we have the connections
that are made to the Arduino so
obviously your VCC or ground you have to
connect them so ground VCC the master
reset as I explained earlier has to be
pulled high in order for us not to
basically clear the register the
register so that's just permanently
pulled up dependents grounded is here
it's the enable and if you look in the
datasheet it's an inverted pin so that's
why it's grounded it's instead of pulled
up but in reality it's actually being
pulled up inside the shift register all
the other the other eight q q0 2 Q 7
pins are connected to an LED through a
current limiting resistor and I've
explained the cauda calculated these
values before so if you want reference
those tutorials the pins 8 9 10 are our
well Arduino pins 8 9 10 are connected
to SH CPS t CP and the des pins so we're
inputting the register value through the
d s pen and we're toggling these inputs
in order to perform certain functions
described in the upper in the datasheet
for this device so let's take a look at
the actual circuit and how it performs
alright so as you can see the breadboard
circuit we have all our this is q0 let's
go into the first LED and this is q1
through Q 7 which goes to beach LED
they're all plugged in with the
series resistor and all of them are
grounded just like I explained it in the
schematic we got power and ground going
to the Arduino board so the white wire
here it's the ground the red is the
power and we have three control wires
going back to the Arduino pins eight
nine and ten and as you can see we are
shifting through our LEDs and they're
going up one by one then going down just
like we were all in the software so feel
free to modify the software showcase
what you've got let me know if you have
any questions make sure to comment
subscribe that would be very helpful and
let me know what you what else you would
like me to make in the following
tutorials thank you guys very much
hopefully you enjoyed this third
tutorial Thanks bye
About this Video
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Mar 10, 2026 Last updated
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