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Questions tagged [74hc595]

Anything related to the 74HC595 integrated circuit. The 74HC595 is an 8 bit serial-input/parallel-output shift register with output latches and tri-state outputs.

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74HC595 Shift Register Latch Pin

I'm picking up a weird bug with my 74HC595 Shift Register's latch pin (Datasheet). What do I want to do? I'm essentially trying to visualise the shifting of the bits with the clock constantly ...
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4answers
762 views

TIP120 Transistor + Solenoid Failing Randomly

I am using TIP120 transistors (controlled by 74HC595 shift registers) to control 12VDC, normally closed solenoid valves. Everything is working in short-time tests however when left overnight, some ...
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2answers
67 views

Can a 74HC595 independently enable or disable output pin without interrupting other active pins?

I am doing a project for which I need to expand the IO pins available on NodeMCU. I plan to use 74HC595 for the same, I have a question regarding that as given below. Is it possible to independently ...
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1answer
67 views

74hc595 sinking, not sourcing

I'm trying to get a sn74hc595n working with an arduino Due, eventually I will be hooking up each output to an NPN to drive Nixie tubes (I am switching my design from a due to using a esp8266 so I need ...
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2answers
850 views

Why does a 74HC595N work in LED matrices?

I have checked a lot of LED matrices, and mostly a 74HC595N shift register is used. In some cases a TPIC595B like below. Example: Driving LED arrays with Arduino Circuit from above example: I ...
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1answer
52 views

74HC595 Inconsistent Outputs [closed]

I'm fairly new to electrical circuitry, and while trying to test out and use a 74HC595 Shift register I ran into some issues. I'm not using a micro-controller, just push buttons to control to the ...
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1answer
69 views

Output setting time for shift register (74HC595)

74HC595 Datasheet here I want to implement ac phase control on a lot of channels (20-25) using esp8266 module. Since it doesn't have as many GPIOs, I want to use serial to parallel shift register. ...
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1answer
158 views

AVR C 74hc595 rgb matrix multiplexing and brightness

I have built a test matrix 2*2 rgb LED's, common Anode. Connected the anodes into columns, and the Cathodes trough 220R resistors into R,G,B rows. Both go to two different 74hc595 shift registers. I ...
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1answer
415 views

Startup Buzzer Sound

I have made a button box, using an Arduino mini pro, which includes LEDs and buzzers. I am using a shift register (74HC595) with a ULN2003 (to use 12v on the LEDs) to decode the SPI. See the top ...
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1answer
250 views

Prevent MOSFET input being low when connected to output of powered off device

I am driving a row of LEDs using an P channel logic level MOSFET (SI2323DS-T1-E3CT-ND) to switch power from a bench power supply. The gate is connected via a current limiting resistor to an output of ...
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1answer
932 views

Manual Demonstration Circuit for 74HC595 Shift Register

I am trying to create a manual demonstration circuit for a 74HC595 shift register. Se my circuit below. The problem I am having is that I am only getting a +0.7V signal to the data, clock, and latch ...
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1answer
150 views

8 led beacon without microcontroller

I would like to create this 8 led beacon with only a single mode, that is turn 2 leds on at a time and move to the next one in a loop like shown in the picture below. I want to achieve this without a ...
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1answer
985 views

L298N (via 74HC595) motor control - unexpected voltage & motor not spinning

(Corrected version as last text was somehow corrupted) I have made a circuit with L298N in order to control direction of 2 DC motors. When I power the circuit I noticed that voltage between 2 output ...
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1answer
407 views

Why does my 74HC595 Flicker rapidly?

I've had a very time-consuming and frustrating problem where my 8-Bit shift register blinks very fast (10-20 times per second) randomly, sometimes it stops, sometimes it does it slower. I am using ...
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2answers
382 views

Can I safely toggle the CS pin without sending any data?

Update: I've tried the solution I proposed in comments in practice (utilizing E pin on the 138 IC during changing target device) and it did indeed work. Read the whole thing if you want more details. ...
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4answers
738 views

One of ten 74HC595 shift registers have wrong output state when clocking in data

I have a project that uses 10x 74HC595 shift registers to control a series of electromagnets (80x magnets in total), switched with transistors. My current situation is that when I pull the reset-pin ...
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4answers
2k views

74HC595 Rows/Columns to drive LED matrix

Let's say we have one 74HC595 and we want to light 16 leds (common anode) connected as a 4x4 matrix exactly as in the following picture : So, 4 first outputs to controls 4 rows. The remaining 4 ...
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1answer
754 views

74HC595 - Initial output voltage

I've gone through the complete datasheet, searched SE and on google, but I cant seem to find this information: Whats the output Voltage of QA..QH just after power-up when G (Output enable) is pulled ...
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1answer
211 views

Problem with 74hc595 voltage in Autodesk Circuits

I am very, very new to electronics, so please be patient with me, as I may say something silly. I also hope the question is not too wide, and would like to thank you in advance for spending your time ...
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1answer
3k views

74HC595 LED sign [closed]

I'm new to electronics so I'm sorry if this sounds stupid. I recently created an LED sign consisting of 97 LED's on a piece of wood that all light up at the same time when I supply it with 3v. I have ...
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1answer
695 views

Relay Feedback Problem

I am a computer science student working on a project for my Diploma and I am building a DIY PDU, I thought building something would be a lot funner then programming a website like 90% of the class ...
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1answer
155 views

For 12X8 LED array with any 1 LED glowing at a time, should we charlieplex or use 74HC595n?

Apologies in advance for probably missing a lot of things. I'm pretty new to electronics. I'm building a 96(12X8) led (monochrome ultra bright, white) multiplexed array, driven by an Arduino nano. ...
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1answer
2k views

Why is the 74hc595 shift register causing a few pins to be lower voltage than others?

I've wired up two 74HC595s to a Photon from Particle. I followed this guide here for Arduino in how I wired it. The only place I deviated is to not put a capacitor on the latch pin. It all appears to ...
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1answer
540 views

Why my solenoid valves open only if power is turned on at last?

I have a set of eight 48Vcc solenoid valves that I'm controlling using an Arduino. The open and close signals are sent using the Arduino's SPI lines, which are connected to a circuit composed by a ...
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1answer
144 views

Extending diode with a buzzer

Basic idea is to extend existing device with a buzzer: I want to make noise when one of the diodes lights up (DL12 on the attached picture). From the layout of the board I assume that U1 (M74HC595) is ...
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1answer
598 views

Shift Registers - How does one pronounce QH'

In the datasheet for the 74HC595 shift register, pin 9 is labeled "QH'" (not to be confused with pin 7, labeled "QH" without the "'"). I understand that this pin outputs the current contents of the ...
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1answer
281 views

Stepper Motor Controller With Arduino

I have seen many tutorial of Multiplexing 74HC595 with led's Is it possible to control Stepper motor with 74HC595 ? And Recently i have found a board SSC-32 which control 32 servos, so is it possible ...
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1answer
3k views

What is the difference between 74HC595N and 74HC595B1R shift registers?

They seem pretty the same, but B1R version is almost twice cheaper (at least in my country, and I don't know what are the manufacturers).
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2answers
426 views

Simplest way to produce a lagging pulse (latch trigger) after receiving another pulse (clock trigger)?

I am teaching myself how to use a 74HC595 shift register, and am fairly new to proper digital circuit design. I ran into a question. I am using a simple circuit involving a few LEDs, a switch for ...
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1answer
2k views

74HC595 + ULN2003A not driving stepper motor

Issue: One of the stepper motors is not spinning. Setup: 12V 10A power supply arduino uno 28BYJ-48-5V stepper motor (27 ohm/winding) 74HC595 ULN2003A The setup involves two stepper motor, as shown ...
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3answers
3k views

shift register RGB led brightness

I'm currently using 74HC595 shift register to light leds. Recently I decided to start using RGB leds instead of simple 1-color leds. Which means that I now have to ...
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1answer
116 views

How can I use a single 74595 to drive two different IC's?

I'm trying to build an audio circuit with as few parts as possible. Also, I really need to limit the number of pins used on my Arduino. I didn't ask this in the Arduino site because I don't think ...
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2answers
1k views

Problem using Relays at 220V with 595

I'm having some complications when I'm trying to control 16 Relays using 2 595, these relays control loads connected to 5V, 12V and 220V. There are 8 loads at 220V using the 8 LSB from my SPI ...
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1answer
653 views

Building LED cube using 74HC595N

I'm working with 8x8x8 single color led cube.(8x8 anode cols and 8 cathode rows) I've done soldering and I have lots of 74HC595N chips. Of course you know one chip can deal with 8 anode lead of LED. ...
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1answer
920 views

Current sourcing octal buffer/line-driver for 7+1 segment LED multiplexing?

I would like to multiplex 8, 7-segment LED displays with two, 8-bit shift-registers. The required current for one segment is 20mA. I have no desire to overdrive the ...
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1answer
407 views

What is the input current of the 74HC595?

I need to calculate the power consumption of my circuit, but I can't find any information about the input current of the 74HC595. I drive the 74HC595 with the atmega8 on 5v, but what is the input ...
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1answer
963 views

74HC595 Shift register - output pin polarity

Most shift register tutorials I've seen have the output pins connected to ground (for instance: http://www.arduino.cc/en/Tutorial/ShiftOut), however I've seen at least one circuit that connects them ...
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1answer
501 views

Looking for a way to output 100-144 Analog Channels from Arduino

I've been searching for days and found 2 ways that could work, but not sure about implementation: Using shift registers like in: http://tronixstuff.com/2011/08/26/tutorial-maximising-your-arduinos-io-...
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3answers
943 views

Why does output voltage increase when pwm input frequency to output enable increase?

I'm trying to pulse-width modulate an output from a 74HC585 shift register. To achieve this, I plugged a PWM output from a teensy 3.1 microcontroler into the output enable input of the 74HC595. The ...
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1answer
413 views

Extending DS2408 IOs with MAX7219 or 74HC595

I have an idea of building a model traffic lights node with Arduino. One node should serve the whole intersection with all the lights from all directions. I want to use a 1-wire DS2408 to identify ...
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2answers
896 views

Shift Register Programming with 8 and 16 bit drivers

I built up a test circuit using 2 74hc595n shift registers to control a total of 16 leds with success. In the interest of saving space, I designed my circuit board to use one STP16CP05MTR shift ...
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3answers
1k views

74hc595n shift register error

I want to put in series 2 74hc595N . I made the schematic from here: When I send a value the first register sends it also to the second one. I have same value on both. I change them (master/slave) ...
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2answers
3k views

Is it possible to drive a 4x4 RGB common-cathode LED matrix with a MAX7219?

The MAX7219 (datasheet) is a LED matrix driver that's designed to drive an 8X8 single-colour LED array. tronixstuff has an intro on how to use it with an arduino that has some relevant diagrams. I'm ...
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1answer
149 views

Help using less pins controlling 8ch relay

I know this has been answered somewhere but can't find the solution online. I have an 8ch 5v->120VAC relay controlled by arduino and need help using less digital pins. All channels need to be ...
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1answer
654 views

74HC595 sharing SPI data line

I want to have my Arduino control several SPI slave devices, among them a 74HC595 shift register. I've having some trouble understanding how to properly handle communication - I get that the Slave ...
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1answer
262 views

MC74HC165N + Arduino, Dunno what's the issue

I connected the 74HC165 as per this schematic http://dlnmh9ip6v2uc.cloudfront.net/datasheets/BreakoutBoards/SN74HC165%20Shift-In%20Breakout-v11.pdf and then used this code http://playground.arduino.cc/...
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1answer
7k views

Arduino TLC5940 and 74HC595

I need to expand Arduino Uno output. After some search I have identified 74HC595 to extend my Digital output and TLC5940 for analog output. I'have also found how to connect them separately to Arduino ...
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1answer
233 views

are the m74hc595bl and 74hct93 interchangeable?

Im about to put an RGB fader circuit together and it requires the 74hct93. I have quite a few of the 74hc595's. I thought since they are close in name and both shift registers I would ask. 74hc595 ...
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3answers
13k views

How much current can my 74HC595 handle on each output pin?

So, I've been checking out the datasheet and I've gotten pretty confused... At the top it claims that 6mA drive at 5V but farther down in the absolute maximum ratings it says that the outputs can be ...
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2answers
1k views