arduino _ use a shift register (74hc595) and a transistor array (uln2803) » erwan's blog
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Arduino _ Use a Shift Register (74HC595) and a Transistor Array (ULN2803) » Erwan's BlogTRANSCRIPT
8.7.2015. Arduino : use a shift register (74HC595) and a transistor array (ULN2803) » Erwan's Blog
http://labalec.fr/erwan/?p=1288 1/3
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Arduino : use a shift register (74HC595) and a transistorarray (ULN2803)
juin
072014
Still on my journey to a wordclock…
In the previous article, we have seen how to use a shift register to control up to 8 digital outputs (or more ifyou cascade IC’s).
One drawback in the previous setup is that we had to use one transistor per digital output (to control a devicepowered by another source).That is 8 extra transistors, 8*3 extra wires, etc : not very practical and especially if we intend to control severalshift registers IC’s. (i plan on using 3 in my wordclock project)
So this is where the ULN2803 comes in : 8 NPN transistors and one common ground in one integrated circuit.
See below a refreshed schema (compared to the previous article). Note that I have decided to power my IC’swith my (regulated) Arduino 5v but I could as well have used my battery pack power.Our 74HC595 will control our ULN2803 (by sending HIGH or LOW on the input) which in turn will drive thecurrent thru each output/led.
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8.7.2015. Arduino : use a shift register (74HC595) and a transistor array (ULN2803) » Erwan's Blog
http://labalec.fr/erwan/?p=1288 2/3
Posted by admin at 20 h 27 min Tagged with: 74HC595, ULN2803
4 Responses to “Arduino : use a shift register (74HC595) and a transistor array (ULN2803)”
1. Ben Vigil says:5 décembre 2014 at 5 h 06 min
I was planning on doing exactly what you are describing in this post, but I was just reading about an alternate highpowered shift register (TPIC6A595) that outputs up to 100mA on each pin, as opposed to the 6mA or so that the74HC595 outputs.
I’m curious if you know anything about the TPIC6A595?
Ben
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admin says:24 décembre 2014 at 17 h 12 min
I dont know about the TPIC6A595 but I believe the arduino is there to deliver logic not power.Hence the 74HC595 is ok for me since I deliver power from a dedicated power source.
Erwan
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2. Arssant says:19 janvier 2015 at 16 h 34 min
Thanks to share the detailed schematics. I will use it to control 2x 4phase stepper motor.
Arssant
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3. Blog J.Schweiss | Arduino recap says:1 février 2015 at 22 h 11 min
[…] : play with a potentiometer Arduino : use a transistor Arduino : use a shift register (74HC595) Arduino : use a shift
//the pins we are using
int latchPin = 2;
int clockPin = 3;
int dataPin = 4;
void setup()
//set all the pins used to talk to the chip
//as output pins so we can write to them
pinMode(latchPin, OUTPUT);
pinMode(clockPin, OUTPUT);
pinMode(dataPin, OUTPUT);
void loop()
for (int i = 0; i < 8; i++)
//take the latchPin low so the LEDs don't change while we are writing data
digitalWrite(latchPin, LOW);
//shift out the bits
shiftOut(dataPin, clockPin, MSBFIRST, i);
//take the latch pin high so the pins reflect
//the data we have sent
digitalWrite(latchPin, HIGH);
// pause before next value:
delay(1000);
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8.7.2015. Arduino : use a shift register (74HC595) and a transistor array (ULN2803) » Erwan's Blog
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