The shift-register tag has no wiki summary.
1
vote
1answer
46 views
How do I control a seven segment display with a shift register and an Arduino?
I recently purchased 4 seven segment displays from sure electronics. They came with their own shift register board which combines the 74HC595 IC with the ULN2003. I want to be able to tie into this ...
0
votes
0answers
49 views
Multiplex data and LED pin
I'm looking at performing a chip conversion for the Sparkfun LED RingCoder. The sample code provided with the product works well on an Arduino UNO, but it uses a pin for each I/O - 5 pins for the ...
1
vote
3answers
81 views
Shift register on a schematic
I just made something cool (or at least in my mind it is), and I wish to save it under the form of a schematic. So I started making one with CircuitLab.
The circuit includes a shift register chip ...
0
votes
1answer
156 views
ATTiny 85 + shift register + ir sensor
I had the ATtiny working with the shift register, but when I added the IR receiver to the code the shift register did not work as desired.
I have a shift register connected to 8 LEDs and controled by ...
0
votes
1answer
27 views
R-EXT connection on the STP16CP05MTR LED sink driver
I'm planning to use a STP16CP05MTR LED sink driver to drive some LEDs in a matrix. The STP16CP05MTR supports constant current by the use of an external resistor ...
2
votes
2answers
144 views
Driving 3.3 V LEDs with an Arduino and a shift register
I'm planning to build a simple LED matrix with an Arduino and some 74HC595 shift registers. However my Ardiuno outputs 5 V to the registers which will pass that 5 V on. How and where along the line do ...
1
vote
1answer
60 views
Resetting a 74xx164 on power-up
I while a ago I saw a circuit in a datasheet that automatically cleared a 74xx164 shift register on power-up. I don't exactly remember which logic series it was (might have been LS or HC), and the ...
1
vote
2answers
68 views
Shifted shift register
I've just had my first go at getting a shift register to work with my Arduino.. it was almost flawless, but I seem to be missing my first bit.
I followed the guide here, but using only one shift ...
0
votes
2answers
273 views
coding using Arduino, two 74HC595 and two RGB LED, problems with shifting out database
the whole point of this was to be able to send 8 bits of color code to 2 rgb leds through 2 74hc595 registers. if i can get the default color for each led to be sent out then the next part of code is ...
-2
votes
3answers
184 views
How do I calculate the required value for a pull-down resistor in a PWM circuit?
I'm using 74HC595 with SoftPWM to control some LED's.
When the 74HC595 is off, its outputting about 0.57v, enough to turn my LED's on somewhat.
How do I work out the value of the pull-down resistor ...
8
votes
2answers
411 views
LED Multiplex Anode-Row Driver
I'm helping build this art installation that amounts to a large 16 x 16 pixel display. I settled on using 16 TI TLC5926 constant current driver chips chained together to give me direct drive to each ...
2
votes
1answer
101 views
PWM drivers of Shift registers that are not open drain?
I am need of a 16 channel PWM Serial based LED driver, or serial in – parallel out shiftregister. I had been looking at TLC5940 and TLC59025 respectively.
But for my current set up the ouptuts ...
2
votes
2answers
995 views
n bit shift register (Serial in Serial out) in VHDL
I'm creating an n bit shift register. When the enable signal is high, I want the shift register to shift n times, irrespective of whether enable continues to be high or low.
I've put a for loop to ...
1
vote
1answer
151 views
Do you know any tricks/hacks to perform arithmetic operations with shift registers?
The trivial case is to use SRL to express multiplication:
val * 2^num => val sll num
val sll 2 + val sll 8 => val * 10
Do ...
3
votes
1answer
165 views
Long Chains of Shift Registers
I want to set up an LED display, and I'm looking at using a bunch of 16-bit LED driver chips (like TI TLC5927) to run a 16x16 LED matrix. Then I'd like to maybe put a few of these 16x16 displays ...
3
votes
2answers
203 views
Driving Relay Board with Shift Register (Shift vs Sink)
I am trying to drive some ebay bought 8 channel relay boards. They are pretty simple, have a launchpad or arduino toggle a pin and the board turns on. However, I need to use a shift register with ...
2
votes
1answer
63 views
Shift Register Data lines?
I was looking at the SN74HC164N shift register datasheet and I noticed something that intrigued me:
There are 2 input signals A and B, but they are NAND'd together to produce the final output. My ...
0
votes
1answer
117 views
How can I emulate the PS/2 protocol without a microcontroller?
I am trying to emulate the PS/2 keyboard protocol with a custom piece of hardware, without using a microcontroller. The said piece of hardware will consist of 13 momentary push buttons.
...
0
votes
1answer
136 views
BBQ iginter power surge
I am building a home beer brewing rig that has several electrically actuated components controlled by an Arduino.
The typical scheme is Arduino -> Shift Register -> Relay -> Component.
One of the ...
9
votes
3answers
501 views
What problems could occur when chaining 40 shift registers?
I'm planning on chaining together 40 x 74HC595 shift registers. The whole chain of 74HC595s will be controlled by a 5 V microcontroller, which will generate the ...
1
vote
2answers
76 views
TCIP6C595 replacement
I am looking for a TPIC6C595 EQUIVALENT that works a a logic supply voltage of 3.3V.
I used to use alot but now have had to use transistors driven fro HC595 - very unsatisfactory.
3
votes
3answers
442 views
What shift register ICs am I looking for?
I'm designing a project that requires far more I/O than a typical microcontroller offers. No problem, right, just use shift registers and stuff. Wait nope, why am I having problems?
I'm planning on ...
3
votes
3answers
878 views
Shift Register output to Relays
sorry for the length.
This is a continuation of my recent question. I have an optocoupled 8-relay board that I’m trying to connect to my microcontroller. I have placed a 74HC595 shift register inline ...
3
votes
5answers
3k views
How to power 24 7-segment displays with Arduino?
I'm working on an Arduino project where I need to power 24 7-segment displays (model Kingbright SC56-11YWA).
I decided to control them using 8 bit shift registers (model 74LS164N). This is ...
1
vote
2answers
277 views
Is is possible to communicate over 1 XBee to multiple microcontrollers?
MC1>XB1 ==> XB2>MC2,MC3,MCn
What I am looking to do is control large LED panels, wirelessly, with control of each LED pixel. My concern is the processing limitations of a single controller and/or the ...
3
votes
3answers
543 views
3 RGB-LED with only 3 resistors
I have 3 RGB LEDs with common anode, a shift register and a microcontroller. Currently I have connected a series resistor for each cathode of the RGB LED, so there are 9 resistors in sum. I wondered ...
1
vote
2answers
768 views
Digital Clock Circuit
I am making a solid wood clock using minimal components. So far, I thought of using 21 LEDs to make 7 segment displays (3 LEDs for each segment (overall 63 LEDs for the displays)), 6 LEDs for the 1 in ...
0
votes
1answer
217 views
HD44780: How long do I have to wait for busy flag to reset?
I'm driving a HD44780 controlled character LCD (HY-0802B-104-R) with shift registers (74LS164). So, the communication will be one-way only; I won't be able to read any data from the LCD.
Normally, ...
3
votes
3answers
284 views
Timing inside a shift register
How I imagine synchronous digital networks work: data lines are sampled at rising clock edge, a set of transients occur, system settles, and data lines are sampled again on next rising edge. I would ...
3
votes
4answers
284 views
Bidirectional Shift Register
I am designing a project that has around 50 or so outputs and around 20 or so inputs. I have designed a chainable breakout board for a standard '595 shift register for the outputs, and was planning on ...
2
votes
2answers
410 views
Algorithm for simulating PWM through 595's
I am trying to get a sort of pwm effect in an led matrix controlled by shift registers. I don't need super fine control, so I'm only shooting for around 16 brightness levels.
For a 24 row matrix, ...
1
vote
1answer
300 views
10 bit PISO shift register
I have a device that has a 10bit parallel output that I need to get to a serial input.
Can I use a 16 bit PISO shift register and somehow ignore the 6 LSB?
How might that work?
0
votes
1answer
509 views
Chaining limit for shift registers in large led matrix
I am thinking of trying to build a large led matrix in a way that is both modular and scalable (maybe up to around 100x100, or 500x16).
My thought is to make a single 8x8 module that I can make a few ...
5
votes
4answers
4k views
How to shift out 16 bits fast on arduino board
I'm coding a system that need to shift out 16 bits fast from a uint16_t variable to two paired 74HC595 shift registers. I'm running the code on an Arduino (atmega328@16Mhz) and the shiftOut in the ...
1
vote
1answer
630 views
Strange bug when Interfacing with Shift Register (CPLD) via SPI
I've implemented a 8-bit Parallel in Serial Out (PISO) Shift register in VHDL on my Max V CPLD. I'm using SPI to interface with the CPLD using my AVR. The circuit works but only partially. Suppose I ...
1
vote
4answers
180 views
Output from a shift register
Does a synchronous shift register put out its result at the same time as it gets its input, or does it output it at the next rising edge?
3
votes
2answers
924 views
How to use ATmega328 SPI with a 31 bit shift register
I'm using an Allegro 6280 PWM LED driver for a project. This is a cool little IC except for the fact that it is a 31 bit long input register. This is no problem if I simply loop through my 31 bits ...
2
votes
2answers
878 views
shift registers: differences between the standard parallel-in serial-out ICs
I must be blind... I'm trying to decide which of the '165, '166, and '597 shift registers is appropriate/inappropriate for a SPI input shift register. All are 8-bit parallel in.
HC165: ...
5
votes
3answers
2k views
POV globe speed questions
I am planning on creating a RGB LED POV globe only physically larger then that one.
I am planning on using 64 RGB LEDs, requiring 3x pins per LED for a total of 192 outputs. Obviously I am going to ...
3
votes
1answer
280 views
Playing with a shift register and some LEDs
Building on this question, I've now got a shift register to play with, and I've been trying to work it manually with a couple of switches, like so:
I have resistors (2.2K) between the switches and ...
2
votes
1answer
482 views
How to switch/power a 13x13 LED Matrix?
Hey all - I have an AVR project in mind that will require a 13 by 13 LED matrix of bright white LEDs. I'll be wiring up my own matrix to do this (not using premade 8x8's). I plan on using some shift ...
1
vote
4answers
804 views
Does anyone have code to emulate a 16-bit input shift register with an ATtiny2313?
I would like to use an ATtiny2313 to emulate a Super Nintendo controller because I have an ATtiny2313 but I do not have an input shift register and I don't feel like soldering wires onto an existing ...
3
votes
1answer
338 views
2/4 Bit Shift Register
I'm looking for a 2 or 4 bit shift register that I can shift data into, and on the 5th shift into the device it will shift the previous data back out on the Dout.
I am looking for a shift register ...
