Negative posting times again in Q+A, and shifting post times

When sorted by recent, the top couple of posts in the Questions section have started showing negative post times again (and not chancing to hours after 60 minutes). As of 6PM UK time, the top two questions are showing information like this: "Asked in Technology by miamimac  -293 minutes ago    Answers: 1" This problem has appeared a couple of times before, all while running chrome on win7, and the issue persists after refreshing the page. EDIT: after looking for a bit longer, new questions are getting added to the list after the ones with a negative posting time. ADDITIONAL: recently, post times have been jumping around, causing posts to be re-ordered and Questions posted recently (with correct posting times) to be moved up, often ending up with negative posting times. Are all users seeing the same posting times, or are the faults dependent on area?

Posted by The Skinnerz 5 years ago


Why is my Chevy Malibu Maxx Shifting hard?

My dads Chevy Malibu Maxx is down shifting hard. We drive at over 10 mph, then shift it into neutral, and when it drops below 10 mph, it down shifts with a thump. Why is that?

Asked by Thelonelysandwitch 9 years ago


why is there to shift keys on my laptop? Answered

I have a macbook and there is two shift keys 

Asked by GianniMora 8 years ago


Shift boot???

Would anyone like a DIY on making a shift boot for your car?

Posted by Morte_Moya 10 years ago


How to drive serial data via (shift registers) AVR?

Is there some sort of code that will allow easy serial data tranfser from an AVR to a shift register (specifically the max6921 driver)? Thanks

Posted by guyfrom7up 9 years ago



Shift register too slow for multiplexing?

Hi, I'm trying to figure out working with shift registers. I bought a couple of 74HCT4094's, hooked them up through my breadboard to a small matrix with some LEDs and my Arduino. Without multiplexing everything works fine, but no matter what circuit I build (changing wires, resistors, transistors, even the Arduino code), when I start to multiplex the LEDS clearly 'flicker' (is that the correct term?). Is it possible that some shift registers are 'too slow' for multiplexing with Arduino?

Posted by Huibgeboers 5 years ago


Color Shift Dimming LEDs

Dim an incandescent, and it produces a mellow, warm orange sunset glow. Dim an LED, with the same SCR dimmer, and it flickers at 60 hertz, still producing harsh blueish light. How can LEDs more closely mimic incandescents?

Posted by Toga_Dan 2 years ago


Which pins are which on a shift register? What pins on a 74HC595 shift register are the data, clock, and latch pins? Answered

I just bought an arduino and was trying to do this tutorial https://www.instructables.com/id/Arduino-Expermentation-Kit-How-to-get-Started-wi/step7/8-More-Leds-74HC595-Shift-Register-CIRC05/ . I have hit some trouble though and I am confused when it comes to the shift registers. When he says to connect to the clock pin, do we connect to the SCK (Shift Register Clock Input) or the RCK (Storage Register Clock Input)? When he says to connect to the data pin, do you connect to the SI (Serial Data Input)? Also what does he mean when you say to connect to the latch pin? The data sheet for the Digikey shift register I am using is in the link below.http://www.fairchildsemi.com/ds/MM/MM74HC595.pdf?

Asked by Stoned 8 years ago


Tilt shift lens for point and shoot (with filter mount)? Answered

Hey i was just wondering if you could make some sort of tilt shift lens for a higher end point and shoot (like panasonic fz100) that has a 52mm filter mount, or do you have to have a DSLR with interchangeable lenses. Thanks in advance :)

Asked by astroboy907 7 years ago


NEED HELP DESIGN ADAPTER FOR TILT SHIFT PHOTOGRAPHY (NIKON D90)

Greetings I would like to 3d print 2 rings to be used as adapters for tilt shift photography . one of the rings would act like a fastener for the camera and the other would be the housing for the lens. A bellow (not 3d printed) placed between these 2 rings will act as a medium for tilt and shift. The issue is i am not sure of the measurements for the nikon d90 model mount and AF Nikkor 50mm f/1.8D lens The attachment  outlines the rough design for printing Thanks in advance. Za fer

Posted by ambroochi 1 year ago


how do I make the gear grip shifter on my daughters bicycle easier to operate? shifting to lower gears needs more torq

My daughters bike has a grip shift for a rear derailleurs, shifting from from easier gears to harder is easy because the derailleur spring assists. when shifting the other way it gets progressively harder to pull the derailleur in. It gets to a point so that my daughter does not have the strength to shift after gear 3 has anyone got a solution, other than hand exercises for my daughter. Thank you

Asked by 8 years ago


electric shift for ford

Is there anyone out there who would want to help do some wiring on an electric shift unit for a ford. It is the kind of project that is a give all and then you get all the whole story and project when it is done. This is just for fun for me so if you would like to help, just let me know. im2sneaky@gmail.com

Posted by im2sneaky 3 years ago


Can a shift register be too slow for multiplexing?

Hi, I'm trying to figure out working with shift registers. I bought a couple of 74HCT4094's, hooked them up through my breadboard to a small matrix with some LEDs and my Arduino. Without multiplexing everything works fine, but no matter what circuit I build (changing wires, resistors, transistors, even the Arduino code), when I start to multiplex the LEDS clearly 'flicker' (is that the correct term?). Is it possible that some shift registers are 'too slow' for multiplexing with Arduino?

Asked by Huibgeboers 5 years ago


how the crystal connected across the collector and base of a bjt pierce oscillator provide 180degree phase shift?

A normal oscillator will provide 360degree phase shift. of this 180degree is by the transistor amplifier and the remaining 180 is by the feedback circuit or tank circuit. but in the case of a pierce crystal oscillator ,it is the crystal which connected across the collector(output) and base provides 180degree phase shift the crystal provide 180degree phase ?

Asked by mishal.abe 9 years ago


laptop Keyboard problem - I can not make a capital m,j,k,i or < with left shift key.

I have an acer keyboard and the computer was opened to repair the speaker output. I did not do the repair and I wasn't present when it was done. Now several keys will not work with the left shift key. The m key does not work with either shift key. When I use the left shift key on with these keys nothing happens. The only way to make a capital m, is to use the caps lock key.  Do you have any suggestions on how to fix this. Buying a new computer is not an option. By the way, the original speaker repair sounded good for only one day. 

Asked by artlife 4 years ago


How to put an automatic car in neutral with a broken transmission? Answered

I have a van that has a broken transmission. I want to take it to the scrap yard to get it out of here. In order to do that I need it to be in neutral so I can move it. When I put the key in and shift it into neutral or any other gear, it doesn't do anything, It shifts smoothly.... not like a normal car. So my question is: How can I shift it into neutral without using the shift lever? Under the hood? It's a chrysler 1999 van

Asked by jacobdlyon 5 years ago


Shift Mosfet and H-Bridge for Arduino Question?

Hi guys, Im Rinozen.. Im newbie on Arduino and Electronic ^_^ Anyway, can you guys please help me? Look at the schematics i've uploaded. Are there something wrong about the track? And what value for the Resistors and Capacitors for the right choice? Sorry about my english ^_^ Thanks for reply... :)

Asked by rinozen 3 years ago


Wiring a wav playing setup and shift register to the same arduino?

I just ran into an issue with my current setup for a project I've been working on. I would like to hookup a wav playing setup (either the Adafruit Wave Shield or a wav playing setup like this) Issue I'm having is I can't change the pins around for the shift register setup (which I have setup and working just like I like!).  I know this is probably a stupid question (what with stacking shields for the uno) but could I wire up multiple items to the same pin? IE wire pin 12 to both a shift register and a wav playing setup? If not, is there some way around this that would work on a micro that would not mean having to jump to a mega. Thanks!

Asked by DoctorWoo 3 years ago


I Need a little Help with Shift Registers

Hello, I'm both new to Instructables, and electronics in general. I'm trying to make a Divergence Meter, but I'm using LED's instead of nixie tubes. (It's safer for having my little cousins around.) I'm hoping to control each tube with one shift register per tube. Each tube will have 11 imputs and 1 output. I was curious if you guys had any tips on how to do that with the standard 16 pin registers, or if you could direct me to one that could do it. Thanks.

Posted by Glyngsdal_inovations 3 months ago


my machine seems to vaccuum properly but will not shift when finished. what could be the problem.?

The machines are not finishing . I have a vac 300 and a vac 370 both seem to vaccuum but do not shift at the finish. Do you have any suggestions.

Asked by fzysw200 5 years ago


Keyboard is a bit strange? Answered

Shift+2 become " instead of @, the two symbol swapped.

Asked by james.woods.581 1 year ago


Combinational Lock using shift registers

Last year, i made the circuit of this already but now my brother is asking for my help and i cannot remember it now. im focusing right now in programming and forgot my logic circuit skills..please help me to remember this... what i remembered is that i have shift registers that memorized the buttons (0-9) i pressed...then i enter again a sequence of numbers and the device will check if it corresponds to the numbers i entered...the led will light if it is correct and will not if the numbers entered did not match the default numbers... i still have the list of some materials, 3 universal shift registers, 1 nand ic, 3 xnor ic, 10 toggle switch and 1 hold switch..  its not a very complex circuit..my only problem is to remember on how will i work with the shift registers... please enlighten me once again

Posted by eaon21 7 years ago


I Need a Little Help with Shift Registers

Hello, I'm both new to Instructables, and Electronics in general. I'm trying to make a Divergence Meter, but I'm going to be using LED's and etched acrylic instead of Nixie tubes. (It's safer for having my little cousins around.) I'm hoping to control each tube with one shift register per tube. Each tube will have 11 inputs and 1 output (11 LED's 0402 type). I was curious if you guys had any tips on how to do that with the standard 16 pin registers, or if you could direct me to one that could do it. Thanks.

Posted by Glyngsdal_inovations 3 months ago


Re-purposing a scanner CCD into an analog shift register

How tough would it be to do that? Based on the research I've done so far, That could be one hell of a challenge for a noob like me. Knowing that, is there a part (preferably 8-bit and has lots of inputs/outputs) that would do the same thing for me? This will be used in a similar fashion as a CCD sensor setup, but light isn't the medium I want to measure

Asked by The Ideanator 7 years ago


What is the work done in shifting a charge of 2 Coulombs from pt A having potential +10V to pt B having a potential -5V? Answered

How will we calculate the potential difference? I'm not sure but I think the potential difference across AB is 5V.

Asked by NishthaC1 3 months ago


1994 toyota 4x4 5speed v6 how do i get to the shifting forks.

1994 toyota 4x4 5speed v6  how do i get to the shifting forks. some times i only have 2nd and sometimes i only have 3rd 4th 5th and reverse and some times it gets stuck between gears. im sure i have to pull the transmission apart  just want  to make sure

Asked by vanrodd 7 years ago


Shape shifters?

Has anybody ever solved a square-1 or other shape shifting puzzles? I am considering making a Square-1 tutorial, but was wondering how many people knew they existed or had them.http://en.wikipedia.org/wiki/Square_One_(puzzle) - is a wikepedia description

Posted by Does Not Compute 9 years ago



Craftsman Tractor Transaxle/Shifting Problems.

Hello, I have a "Craftsman= IC-Gold Series, Horsepower/Over-Head-Valves= 14.5, and the Model # of= (917.270514).  Can anyone tell me how I can get to the "Transaxle", so I could grease it??  It is shifting extremely hard, and trying to mow with it is quite difficult.  I have been searching for a diagram that might show me where/how to get some grease into the transaxle to enable easier shifting of the gears.  Thank You for your time/attention to my inquiry.

Asked by acebird 7 years ago



Pesky shift registers? Answered

I started working with 2 74HC595N to control 8x8 matrix, and found that instead of a dot it activates multiple rows. So I assumed this was due to my lack of knowledge about shift registers so I setup a simple scenario from arduino ShiftOut tutorial (single register chip and 4 LEDs controlled by number via serial input i.e. "one by one sketch". Thats when I found out that shift register has almost random values on its output pins. Some LEDs were on, some off before I started to controll them. After I turned on/off all 4 it strated to work as supposed to, but last pin retained "memory" of its state even if I reset Arduino.  So my question is, do I always need to initialize every pin of every shift register (and is there an example sketch), or do I have faulty IC? Edit: Added schematic (it's from http://arduino.cc/en/Tutorial/ShiftOut)

Asked by bratan 5 years ago


Shift Registers vs LED Drivers?

I am trying to figure out how to program an arduino to control LEDs. Basically, what I have done, is I have made a 3x3 matrix and can program some simple sequences with the LEDs using the digitalWrite and delay functions.  I'm not even sure that this is the right way to do this, I don't think it is, but it works.  Anyway I want to try to program bigger matrices and maybe LED cubes using my arduino, but without using up all of the output pins. So, I've came across two ways to get more outputs from less pins; LED drivers and shift registers.  These may be the same thing and I'm just not aware.  But anyway, is there a difference between them? I've really only found information about shift registers, nothing really about LED drivers.  Is one easier to program? Does one use less pins than the other? Or are they just the same thing?

Asked by texpert 3 years ago


Why has my 2001 toyota manual transmission become hard to shift into 3rd and 4th?

It is a 5 speed. 1st, 2nd, and 5th shift normally. It feels like 3rd and 4th are going into gear shallow; some times they will pop out imediately after engaging. This condition just started.

Asked by trentjordan 7 years ago


Text box shift of different monitors

I now do my Instructables on a wide screen laptop. If I view them on a desktop with a formerly "normal" narrow monitor, the text boxes have shifted their positions and are no longer over the part of the photo where I placed them. I do not know if I should add a cautionary note to the body of my Instructable, or assume everyone is using a wide screen monitor these days, or assume people will figure out what I intended. Does anyone have any wisdom on this? Thank you. (If this has been covered before, please excuse me.)

Posted by Phil B 6 years ago


any make shift cnc mill that i can build on my own? Answered

I really love designing and study cnc operation. my problem is no one would hire me because i got no experience. so, i decide to make my own cnc machine? is there any way i caxn build one

Asked by benvet 1 year ago


1992 Toyota Paseo (5-speed manual transmission) with difficulty shifting into 1st, 2nd, 5th & reverse?

I have a 1992 Toyota Paseo that's recently started shifting hard into all gears except 3rd & 4th.  We've tried it even when the car's off and it's still having difficulty, so it doesn't seem like it would have anything to do with the clutch.  Weirdly, it doesn't seem to do it all the time. It almost seems like it does it right after it's rained. When it's being difficult, the hardest to shift into is definitely reverse, although 5th isn't always a picnic either. 1st and 2nd are a little tough, but not that bad. 3rd and 4th are smooth as butter. Is it possible for the shift assembly box (or whatever it's technically called) to have some sort of difficulty that could be causing it to stick or be held back in some way? My boyfriend is a mechanic (although he hasn't been able to take it in yet) and he doesn't think it's the transmission, but he's not all that familiar with manual transmission cars. It's got about 160,000 miles on it. Any thoughts?

Asked by kokocooper 6 years ago



why is the o/d light blinking on my 97 ford taurus?

Transmission wont shift into overdrive

Asked by kgadams456 8 years ago


Is it really OK to shift into neutral when coasting downhill? Answered

I drive a 92' Dodge Dynasty with an automatic 4 speed transmission. I've read in almost every "fuel saving" instuctable that if you shift into neutral while going downhill, it'll save gas. I told my dad this, excited at the prospect of getting better mileage, and he said that when in neutral, the transmission fluid doesn't circulate in the transmission and it's like the worst possible thing to do. Dad's worked on cars forever, but he learned to work on older ones. I think maybe what he's saying applies to older transmissions or something. Basically, I figure that if it really will cause damage, someone else would have spoken up by now in comments or something. So, please, settle my nerves. I love my car and don't wanna damage it, but I also want better mileage. Is my dad right or is it safe to shift into neutral?

Asked by Funk_D 7 years ago


Arduino Vu meter/Mood light?

Hello There :) I have this concept: A wall to ceiling light that consists of several segments that are lit with rgb leds. I want it to have two modes - VU meter mode and rgb mode (goes through rainbow of colours) I know how to do each separately: -VU meter - There is an instructable I can follow -RGB mode -Using shift registers etc.. But I don't know how to incorporate them together. Can I use a shift register and an arduino (through PWM) to give functionality of both settings I would like? Thanks, Joe

Asked by joearkay 6 years ago


Newbie Alert!Is it possible to make a 8x8 led matrix with 74hc595 shift registers w/ arduino?

If so can someone help me with the schematic? And also I'm using an arduino uno r3 if that helps? I kind of would need help with the programming as well. I have transistors (2N3904) and resistors (100 Ohm/200 Ohm) too.  Thanks for the help!

Asked by scooter2013 4 years ago


marble disorder v2: a 45 degree paradigm shift

I've upgraded my Marble Disorder instructable to v2 (see last step) and it's now way cooler than before (with a new video too). Not sure where I should announce such a thing, and I hope it's OK to do it here. Cheers, @TheRealDod

Posted by thedod 7 years ago



Turntable speaker with piezo speaker glued to make-shift horn? Answered

I'm wondering if I could take a piezo speaker, glue it to the bottom of a make-shift gramophone horn, and wire it directly to the RCA output cable of a turntable. Would this blow the piezo speaker? And I'm not sure if it's called a piezo speaker or not, but it's the small, flat circle, I think it may be called a piezo element.

Asked by josh1324 6 years ago


analog demultiplexing?

Is it a good idea to use just a single DAC to produce 2 or more separate analog outputs? I do not need super fast updating rate, but I do need precision. My DAC is a old but pretty cool looking DAC71, of which I have like a handful. It has a 16 bit parallel interface (which is a REAL PAIN) and a CC output. Placing a small resistor on the output of that gives me a voltage range. To interface it to an arduino, I used two 74C164 shift registers so that I only use 2 pins on the arduino. (one for clock, the other for data). However, the DAC does not have an updating rate, it is kinda analog in that respect. Because of that, you can see all the garbage from the shift register outputs while data is being shifted in. My current solution to this problem was to use a spare TL601 analog switch and a 3rd wire from the arduino to "mask" the updating period when data is being shifted into the registers. This worked well, until the wire popped out and came into contact with +12V rail, killing arduino pin 10. :(  so sad, it was literally a brand new arduino clone... In a similar fashion that the output of a single ignition coil in a car is fed into a distributor to distribute voltage to the correct spark plugs, is it OK to use a few more analog switches to do some interlacing? Are there things that I potentially have not considered? My idea is that after data for, say, output A has been shifted into the 2 registers, the arduino will activate switch A and (through a buffer amp) charge a capacitor up to the same voltage, then turn switch A off while shifting in data for output B, then activating switch B to allow the capacitor to charge up to that voltage, and again the switches turn off to let new data for output A shift in, and the process repeats. The capacitors will "remember" what voltage they held during the off period, as sort of analog memory. I think the updating rate will take a hit, but oh well.

Asked by -max- 2 years ago


Phase shifting?

I've been considering building my own ground penetrating radar unit rather than pay outrageous rental fees and mind boggling full prices and I keep coming back to the same problem: time of flight is haaaard. My most recent thoughts on how to go about collecting that data would be to use 2 clocks/crystals that are offset from each other by fractions of a percent(one would be straight from a rubidium standard, and the other from a frequency multiplier). One would be in charge of timing the emitter and the other for timing the receiver. This is the part where I make tons of assumptions about things I know nothing about, so correct me if I'm wrong.      The emitter is running at f1 and it emits a short pulse.      The receiver is running at f2 and collects data as fast as it can until the reflections dissipate.      The emitter pulses again      The receiver, due to the f1:f2 phase shift, is offset by a tiny amount and again collects data as fast as it can. This cycle repeats until the collective phase offsets brings it back around, building the image . My thinking is that this shift, given the time to cycle around, could provide data that is functionally in the range hundreds of GHz, provided the target doesn't move(which at milliseconds per dataset, is functionally true). Could this work?

Asked by The Ideanator 4 years ago


stop 7-segment from ghosting?

I'm working on a simple arduino 7 segment driving circuit. (It also has a led bar-graph that displays binary numbers but that part is working fine.) When I get the display working I might make an instructible out of it. Here's the basic layout: -using this 8 segmet 4 digit common cathode display. -arduino controls what segments are on via 74HC164 8-bit Serial Shift Register -shift register controls an array of 8 PNP transistors with base and pull-up resistors -transistors connect to display anodes through resistor array -display cathodes (common for each digit) connected to array of 4 PNP transistors with base and pull-down resistors  -PNP transistors controlled by arduino. (I will post the schematic shortly.) In software, to display a four digit number, I shift the pattern for a given digit to the shift-register, which in turn turns on the PNPs for the corresponding segment anodes. I then turn on the NPN for that digit's cathode. I delay for a few milliseconds, then turn the NPN off, shift the next digit in, and turn the NPN for that digit on. Rinse and repeat. It works fine but the segments that should be off are at about 1/2 brightness, making all the digits look like eights. Even the DP looks like it's on and I'm not turning it on anywhere. Do I need pull-down resistors for the anodes or something? What's going on here?

Asked by Vick Jr 6 years ago


Shift, Ctrl and Alt Keys only

Hello Everyone, I need help urgently, I'm a graphic designer plus an instructor and my tools of trade are Photoshop and Illustrator. Last Monday I had a road accident and got my right hand fractured. I've resumed my job but having lot of difficulty in working and teaching. Although I'm a right handed person. I am still managing to use mouse with my left hand now problem is only mouse is not enough to work on these softwares. I was wondering if any one can design a simple strip with three buttons having functions of  "SHIFT, ALT, CTRL" and can be connected through USB and I will stick that strip on my plaster near fingers of right hand. So that I would be able to work properly. I only need a PCB designed so that I can hire someone here in Pakistan to make this for me. Doctors are saying that this plaster would last for atleast six weeks. Please help me. Regards Imran Ali

Posted by iadina 7 years ago


Random flashing LEDs when using shift registers and turning on the system: how to fix? Answered

I have a setup using 5 shift registers (74HC595s) hooked up to an arduino micro. Everything works great! So much so, that I didn't pay too much attention to the start up issue. When I start up the system (either by hooking up a battery or plugging it into a USB socket) the LED's hooked up to the 595's will either turn on according to the last pattern they had, or turn on randomly. I was following the Arduino tutorial for this, and it does state that "The one flaw of this set up is that you end up with the lights turning on to their last state or something arbitrary every time you first power up the circuit before the program starts to run." It also states "You can get around this by controlling the MR and OE pins from your Arduino board too, but this way will work and leave you with more open pins." However, I'm either missing it or it is not outlined how to hook up the MR and OE pins to the setup to correct this. Any help is greatly appreciated! 

Asked by DoctorWoo 3 years ago