sidecar wheel position

I've looked up sidecars on google and found lots of information for sidecars on vehicles that have front steering only in which case the sidecar wheel tends to be positioned parallel to somewhere between the midpoint and the rear of the vehicle, however if the vehicle has both front and rear steering would the sidecar wheel be best positioned parallel to the exact midpoint or not?

Posted by ambientvoid 11 months ago

Ultrasound 3D positioning

How would you use an array of ultrasonic sensors to determine the 3d position of an ultrasonic transmitter. Basically i want an ultrasound transmitter on my hand that gets picked up on an array of 5 or so receivers that outputs the position via usb.

Posted by redshirtdeath 7 years ago

Indoor spacial position system (indoor mini-gps)

Hi all! I'm hoping to work on a little system to allow a device to work out where it is in a room, with some degree of accuracy. I've thought of a few ideas; cameras and tracking points, sonar of some sort, and a few others, but they all have the caveat of requiring direct line-of sight, all the time. My most hopeful idea is that I could create a sort of mini GPS system, thus: A number of radiowave transmitters, perhaps FM, sit in the corners of the room, and transmit the time, or more likely something like 0-9999 in binary, all the time. My device then moves around the room, and works out where it is in the room, based on the number received by each of it's 3(?) radios, and the difference between them. There are a few potential caveats to this approach:   The radio waves may well bounce off the walls, and confuse the receiver.   The assumption is made that there's enough time between transmission of the signal and receiving to notice a difference   Obstacles to the line-of-sight might skew the difference The list is long. I don't suppose anyone has any input on this idea, do they? Graham

Posted by paradoxdetected 6 years ago

Odd Breadboard Question

Hi All  I am brand new to hobby electronics and would love one day to be able to create the endless amount of cool Instructables but I have ran into a problem on my first attempt at putting theory into practice and would really appreciate any help. I have made two diagrams / images showing the circuit I made I have attached them to this post. I am using an Arduino Uno as a power source.... I ran a 5v positive from the 5v pin on the Arduino using solid core jumper to the top of the breadboard onto the positive row / rail and a negative / ground jumper to the bottom of the breadboard. In the middle of the breadboard I placed a 1k ohms resistor bridging the gap / grove/ divide and ran the positive feed through it and on to the anode leg of the LED. The cathode leg of the LED was connected to the negative row / rail completing the circuit. All works as it should because of the high resistance from the resistor the LED barely lights and is green as it should be. So without using a multimeter I know and can see the resistor is clearly working. However if I move the resistor so it's still on the same line / row as it was but no longer bridging the gap the LED goes super bright and turns yellow which means that the resistor is no longer working which I can't figure out why because I know there is definitely current flowing through it given the extreme reaction of the LED. I vaguely remember reading somewhere on these forums that Fritzing is not liked very much so I hope no one minds but to help explain what I mean above I have created two diagrams / pictures using Fritzing. The images diagrams shows the resistor "bridging" and working and the other shows it not bridging and therefore not working. So my question would be why given the resistor has current flowing through it does it not work unless it's bridging this middle divide / gap / grove? It makes me think I am missing something really stupid that everyone should know about breadboards but just seems really odd to me. Many Thanks Rab

Posted by belfastrab 3 years ago

Digita Media Enthusiast/Tech Support Specialist

Job description ABOUT PAI PAI is a community rich in culture and diversity, distinguished by its high level of job satisfaction. We believe that our team members are our most valuable assets, so we recognize and reward great performance. We believe in open communication and foster an environment of creativity, loyalty and respect both for employees and clients alike. THE BIG PICTURE Do you like to get into in-depth trouble-shooting that would revolve around TiVo, DVR, or multiple types of digital video media? Do you excel in communicating with people in both a technical and non-technical way? Are you known for thinking outside the box when it comes to creative trouble-shooting solutions? If so, there’s a strong possibility you’d fit in well with an exciting new project at PAI. As Team Leader, you’ll assist in providing first-and second-level customer support for the full line of video media software products for our newest client. You and your team will interface with customers via telephone and email to provide troubleshooting, patches and/or bug fixes, version upgrades and software use tips. Ensuring the highest level of customer satisfaction is key, and will be measured by providing quality issue resolution within the established response time intervals and service level standards. DESIRED EXPERIENCE/QUALIFICATIONS • Basic professional understanding of video standards such as NTSC and PAL, frames and fields, and frame rate and basic video signals such as composite, S-video, Component, SDI and DV. • Basic understanding of broadcast digital video formats and compression such as Standard Definition, High Definition, MPEG-2, GOP Structure, Program and Transport Stream, as well as popular internet streaming, and download and desktop media formats such as Windows Media, Real Networks, QuickTime, MPEG-l, MP3, MPEG-4, etc. • Understanding of audio channels, digital audio sample size sample rates. • Understanding of non-linear video editing concepts. • Familiarity or use of a content management system or digital asset repository THE EVERYDAY VIEW • Phone, Email, and Remote Desktop support to resolve client issues, • Lead a professional team in providing world class support to leading industry customers • Verify and escalate bug reports to Engineering for resolution • Document problems/resolutions for internal/external knowledge base articles. • Effectively communicate with customers, both written and orally, to manage expectations through the trouble-shooting and issue resolution process. WE’RE LOOKING FOR SOMEONE WITH: • Excellent trouble-shooting/problem solving skills with high attention to details and good follow-through. • Excellent written and oral communication skills. • Ability to install and configure Windows Operating Systems. • Basic hardware, software, operating system and device driver troubleshooting skills. • Basic understanding of MS SQL and/or Oracle server installation and configuration. • Basic Linux/Unix installation and administration skills. • Understanding of Windows File Systems, configuring IIS, JBOSS, Apache, File permissions and Disk management. • Ability to troubleshoot basic networking and connectivity issues including TCP/IP, DHCP and DNS. • Ability to effectively work with a variety of personalities and occasional stressful situations. • Ability to multi-task under time constraints. • Able to work Evening and Late Night shifts. • Experience providing support within a Network Operations Center environment, • Digital Media or related Software or Production Service or 2+ years Digital Media Encoding/Production Experience.  To apply:  Cindy Law HR Manager 858-495-3525

Posted by clawpaisd 8 years ago

Ch. 3 In Which Old Science Creates New Technologies

Hey Instructastorians! I know I haven’t been keeping my Instructables Intern Blog updated, so in advance I apologize for the lateness in this update. Things have really picked up since the last time I posted anything here! As some of you might remember back, a couple of weeks ago Instructables HQ, which where herein be referred to as Instructables Laboratories (Seriously, that’s what they call the building here!), held a massive social event involving Liquid Nitrogen and fast freeze Ice Cream. It was a rising success for everyone and more than 70 people visited our lab! The Ice Cream was fantastic to, due to our delicious confectionary staff particularly Angie, and our Maker Faire ticket raffle was awesome. As for the Faire itself, I unfortunately was not able to participate in the Instructables Booth, being more than slightly preoccupied with my own DIY PIXAR stand, but I heard it was great. They managed to give away almost all of the Lab’s business cards and even managed to sell several dozens of our Robot T-Shirts! Sure beats the hell out of being stuck in a dark room, with several hundreds of people jamming into your personal space, while Tesla Coils scream Classical Music at 56 decibels… BUT, last week after the Faire, things became sadly much more subtle. Several people around The Lab were still recuperating from the hectic events of the Faire and there wasn’t much to do around the office. Being recently promoted to the job of Delivery (meaning I get to control all outward shipment of prizes and gifts), my goal was focused on trying to ship out a lot of the past closed contest prizes from a couple of months past. Thankfully Instructables had a monthly event to obliterate this post MF doldrums- INSTRUCTABLES BUILD DAY! This is held on the last Friday of every month, where most work is momentarily cast aside and everyone instead works on their own personal Building projects! SWEET! So for my project, I ended up creating something really cool involving PVC pipe connectors, a Shop Vac and several feet of clear vinyl tubing ('ible coming soon).  I'm making a note here- HUGE SUCCESS! As for myself, even though I might’ve gotten used to waking up at 6:00 AM to commute 1.5 hours to San Francisco, I’m still completely thrilled to be working here. Always something new going on and never a dull day at the office Lab. OH and I finally got my own key! Now I can enter our labs without setting off the Turret Defenses! -New Intern 2011, SHIFT!  

Posted by SHIFT! 7 years ago

Major Work Location/position sensor for a cricket bat

My name is NicholasI am in Year 12 at Parkes Christian School and making a major work that i can track where i am hitting a cricket ball on a bat. similar to what hot spot is and to be able to relay the information on the position to a phone via Bluetooth(video to help with what my idea is) At the moment i have ordered a Raspberry pi for the help transmit the data, EeonTex Pressure Sensing Fabric, EeonTex Conductive Fabric. But i dont know what else i would need so i can get the information of the position to a raspberry pi like what types of thread do i or is there some thing else i need as this is my first time making something like this Thanks in advanced

Posted by Nicholasrsk6190 7 months ago

3D Precise position/orientation tracking for body-worn camera

Hi all, It's not a new question but the available technology keeps changing so I'll ask this again, having not found any current answers online that are useable at a diy, non electrical engineering level... I'm working on a project in which a body worn camera is tracked in space, then recreated as a virtual camera in the corresponding virtual 3d space (kind of like a lo-fi version of the cameras used on the "Avatar" set). This is to be done over 15-60 minute durations in an indoors area of about 30X30 feet. What I need for this is tracking of the camera's position and orientation in space, precise and continuous (as much as I can get, but at least within and inch or 2, and a few degrees, of the true values),  to be either logged on the tracking device and/or transmitted to a computer on set. Since it is body worn, it needs to be light and wireless. Since it's on a moving body in a space with some objects in it, optical tracking isn't really a good option. I looked at a wide range of solutions, from "flock of birds" and the inertiaCube on the crazy-expensive side to sparkfun's IMU sensors, but frankly am a bit bewildered by the selection and don't know how to figure out which is the best to try first, given my needs. I'm really not looking to reinvent the wheel or rebuild everything from scratch, just find a solution for this not costing more than a few hundred dollars that is fairly reliable. Software-wise I want to be able to get 3D XYZ position and rotation values from it that I'll be able to use in Realtime 3D software such as Max/MSP Jitter and the like. Any ideas, stories of previous experience with such setups, links, etc would be extremely welcome. Many thanks! nadav

Posted by nadvass 7 years ago


Today was the first time i wanted to comment, but found myself confronted with this: "We have a "be nice" comment policy. Please be positive and constructive with your comments or risk being banned from our site." In my personal opinion, constructive comments are rarely positive and positive comments tend to be rather useless. Who thought the statment quoted above is a good idea and can it be changed?

Posted by Xaromir 7 years ago

Are positive comments votes ?

*same as topic*

Posted by bryceronie 11 years ago

maintain initial and end position stepper motor without energy loss

Hi all, In a project of automated vertically folding curtain I have the problem that whatever the position of my curtain (8 kg) is, the motor is always drawing current. Let's say the curtain stays for 8 hours in the same position, then during these 8 hours the motor is wasting lots of energy. Is there a method/mechanical system which can be used to make sure the motor only uses energy ("works") if the position of the curtain has to change? Thanks in advance

Posted by mmsyx 2 years ago

Ipod Problems

I have an Ipod Nano (old one) and the Ipod seems to be stuck on the "Hold" position regardless of the switch position. I plugged it in and it won't charge! Please Help!

Posted by Amadeos 11 years ago

servo controlled by arduino

Hi everyone and thanks for looking. I wanted to conrtol a servo using ardunio. This is what I want the servo to do, I want to be able to flip a switch and have the servo move. switch in "off" position, servo is at rest flip the switch to "on" position, servo moves 90 degrees and holds switch to "off" position, servo returns to rest position I am just starting out with arduino and really didnt know what was need to acomplish this. any help would be great. Thanks in advanced

Posted by thirdGEARchirp 6 years ago

Resistor negetive to positive?

Hey. I'm changing all the LEDs in the switches in the car. All is going well except one switch, there is 1mm distance between a circuit board and the LED. The LEDs are 12v no resistors. I'm using ultrabright red LEDs that need resistors. However, I'm sure I've seen circuits that resistors go on the negative and positive leg before the LED. Would this work or would the LED still blow? Thanks.

Posted by Josho 9 years ago

how to convert negative pulse to positive

Hello.. I built a transistor scr to turn on leds in my car from my remote.. my remote uses negative pulses to turn on and off... now the problem is that the scr needs a positive pulse to turn on but it uses negative to turn off,, so turning it off isn't a problem.. Im pretty sure I can just use a transistor to do this.. here is the schematic I used to build the scr...  ... fig 75b... is there a way to modify this circuit to make the turn-on negative or just a way to use another transistor to make my negative pulse positive? I could easily use an automotive relay to do this but im trying to make this as small as possible and its still on the breadboard.. I want to get this figured out before I put it on pcb.. thanks for your help

Posted by aclark32 5 years ago

Positive affirmation box

I am trying to make a positive affirmation machine so that when my students turn in homework it will either give an audio message or display a message that says something good.  I know I need to build an optical sensor but I was wondering if there is a build that you can suggest that I can modify?  I have moderate skills with building electronics and access to plenty of materials but I am lost as to how to start.

Posted by Mr.E1 3 years ago

Positions available at Instructables (October 19, 2018)

Working at InstructablesIf you don't see an open position that fits you, please don't hesitate to drop us a line and say hi. We are always actively building our network of curious, creative talent with a passion for making. To introduce yourself, please send your cover letter and resume to auctoramentum at instructables dot com with a fun, robot-related subject line

Posted by ewilhelm 3 years ago

Account not logging in, but I'm positive I have the right pass word!

HELP! Every time I try and login to my other account, it wont let me!!!!!!!!!! HELP! I know I have the right password!

Posted by DrWeird117 10 years ago

2 Position Servo Controller

I need some help, I am trying to create a damper control using a servo and a 555 timer. Is there anyway that you can use a 555 timer to make a servo move back and forth between 2 positions (0 degrees and 90 degrees) with an with and on/off signal and not a pot? So when the thermostat sends power, the damper moves to 90 degrees, then when the thermostat shuts off the servo returns to 0 degrees? Thanks for the help in advance. -Ryan

Posted by WingmanSVT 6 years ago

HS Tech Director, teaching positions in SF

A friend forwarded this job posting, figuring Instructables users might be interested!It sounds like a fun place to work:Lick-Wilmerding is a pretty cool high school in San Francisco. Bothour daughters went there. They have a full mandatory shop course forall students -- woodworking, metalworking, glass, architecture, etc.This is a job posting for a new tech director.Job posting info here. They also have listings for English, History, and Math teaching positions.

Posted by canida 10 years ago

Code of determination the position of my finger in a screen

Hello guys I am so happy to be in this big helpful community. So I am student and I love electronics, this is why I am working on a touch screen working with the technology of projected capacitive sensors using, of course the Arduino Unoto determine the position of my finger on the screen and show it on an interactive screen (like the project of the 3D tracking interface Because I want to know more about this domain also to share this project with the geek of electronics in Instructables and learn more about Arduino . So please guys I need an example of an Arduino sketch to show the position of my finger. I know that's I didn't talk about the details, so if you want to make this project happen , this is my Facebook account (

Posted by FarfaouiM 9 months ago

A Third Math Sign - not just positive or negative

I was thinking about a random thing the other week. We have positive and negative signs in widespread and ubiquitous use in mathematics. What if we had a third sign? The number line would look like the one in the picture. It's not even a line anymore. Since I am absolutely dumbfounded as to how even the basic operations would play out in this type of system (although I have a rough idea for addition and subtraction), and nor do I know what the possible applications for a redundant sign could be, I'm just putting this here. Got ideas? Fire away.

Posted by nutsandbolts_64 4 years ago

How do i connect some wires to a power supply?

I know nothing about electronics but i need this for a proyect. So i have some LED lights that come with positive and negative wires to connect to some sort of power supply (i need recommendations for cheapest!). My guess is i need some sort of power supply with the wires out so i can "twist together?"(or make them come into contact?) the negative of the LEDS with the negative of the power supply and positive with positive. I dont know if that's the way... and what would be the cheapest power supply if the LED's wires are 12v?

Posted by yerbamala 8 years ago

What can you do on a bike?

Awkward position, what can you do?

Posted by Evil Bike 10 years ago

Please Can you help me

Please Guys I want Arduino Code for this projrct : am using ESC to control the speed and Gy-81 as feedback to control position Hardware : Arduino Uno Gy-81(10DOF) 1000kva Brushless motor 30amp Esc

Posted by hakeem.1987 3 years ago

Random LED Light up

I'm trying to make a row of 6 LED's where a random one light up when you press a button. I'm using a toggle button, so the led stays on until the button moves to the Off position. Then when you move it to the On position it chooses another random LED to light up. How could I go about doing this?

Posted by l4nd0fc0nfu510n 9 years ago

My plaster of paris molds never work

I tried making one part and also two part (push) molds with plaster of paris. I followed the directions and mixed two parts of plaster to one part of cool water and poured into a box (dunno the technical name for it) over my shape. But the plaster sticks to my shape no matter what. I can't get my shape (positive) out without breaking my mold b/c it won't release. I've tried mineral oil, silicone release spray, and vaseline. The vaseline has worked the best but I can't use it on every part. I've tried making a mold of a piece of wood and a concrete paver and neither of which worked.  I don't know what I'm doing wrong. It seems fairly straight forward. Lubricate the positive (what I want to make a mold of), put a slab of clay down, put the box around the positive and imbed into the clay to prevent leaking from the bottom, and then pour the plaster over the positive. 

Posted by msminnamouse 4 years ago

female USB port power question

Im odiously new and i cant find where to attach the positive and negative . thanks in advance

Posted by rubberbanddude 11 years ago

how to detect sensor position with arduino uno

Hi Guys recently i started use arduino UNO and with simple programs to read from analogue pins wasn't hard. now i'm facing a challenge, as i have a sensor mat 16x16 (rows and columns) i want to read 4 rows and 4 columns i'm trying to use the analogue pins as input for rows and digital pins from (8 to 11) as output i want the program to detect the position of the sensing area such as (row1 colum 4, for example) and give me the number that measured over this area. my code is very bad but i'm trying, specially my background wasn't programming or science. any ideas will be great.

Posted by Najeebgh 1 year ago

Question about switches...

I am very new to electrical projects. Please be nice. Does it matter which side is positive or negative on a switch?

Posted by Soileau 10 years ago

Help with electric wheelchair motor-controller?

I recently bought an old Invacare wheelchair to use the motors and controller to integrate with a computer. However, the "MKIV INT" (i'm assuming that's the manufacturer) motor-controller is an all-in-one with the joystick in it. I removed the joystick, hoping I could connect to a DAC and my computer via parallel port, but the joystick has a small circuit inside of it. I'm assuming the circuit gets 5V from the controller and sends pulses of the analog joystick position. I was thinking about de-soldering the 4 wires from the joystick (2 wires for x-position and 2-wires for y-position) and first try to replace the joystick with an old PC-joystick--just to see if the controller detects different resistances of a different joystick, etc...

Posted by ferris_beuller 9 years ago

Need help to design mechanical mechanism

Hello everyone, I want to create feeder cart with seperate section, that will be hangin on rails.  Feeder cart will have four positions: First one (First load) will be bottom gates closed, middle gates open to the top. Second (Second load) will  be bottom gates closed, middle gates have to be locked in horizontal position. Third  position (First unload) bottom gates open, middle gates have stay locked. Fourth position (Second unload) bottom gates open and middle gates also open, that stuff drops out. I want ask you advice how to design bottom and middle gates open, closing and locking mechanical mechanism (without any electronical parts). This feeder cart will be operating by one man.  I have created middle gates mechanism, but maybe you have better solution.  I really appreciate for any ideas. Sorry for my english mistakes. English is not my native language. Link to my feeder cart design:

Posted by DonatasD4 1 year ago

Why are "ground" and "(-)" often referred to as the same thing.

Ok, so, I am very confused with wire colors, ground and (+) and (-). I NEEd someone to answer me. What I have read is that electricity flows from (-) to (+). However red wire is always connected to (+) and referred to as the "hot or "live" wire, and (-) is the ground. This seems backwards to me. Ground wires go to ground because it is highly positively charged, It just seems like there is contradictions. I really need this cleared up. Thanks in advance!

Posted by Ampix0 5 years ago

dual picture alignment

Hi I got problem how to alignment two piece of metal like on picture to seat one on other,  with simple home made device ? I got idea to get picture of both and just position one to right position, but problem is how to get picture of both in same time on screen ? I see that is possible with prism mirrors but I dont idea how to do that, so I ask for help with ideas. Thank you for help or link's to get more infos about that.

Posted by primoz 5 years ago

More Spam

Here is the link to a spam post and a spam user account. me what you think. Is it spam? Or is it legit?

Posted by dla888 9 years ago

Measure triangle wave with DC ammeter

If I measure a positive only triangle wave with an analog DC ammeter will it give me a relatively accurate current measurement?

Posted by kenw232 4 years ago

Website problems?

Is anybody else having problems downloading PDFs? Some of the links just seem to be to the HTML page that is currently being viewed - maybe it's an experiment in visual positive feedback... Duncan

Posted by duncan_a 9 years ago

Plasma Rifle

Been working on this for a while. What do you think?Since I'm getting so much positive feedback, here's the instructable:

Posted by DRADIS 10 years ago

Servos motion not smooth

Hi, im trying to program my servo to do a simple sweep (smooth motion). but instead it jerks a small degree everytime. the code i've used : #include Servo myservo;  // create servo object to control a servo void setup() {   myservo.attach(9);  // attaches the servo on pin 9 to the servo object } void loop() {   myservo.write(10);                  // sets the servo position according to the scaled value   delay(1000);                           // waits for the servo to get there   myservo.write(150);                  // sets the servo position according to the scaled value   delay(1000); }

Posted by fujiapple 6 years ago

LED'S in a guitar?

I watched a video and the guy playing guitar had his position markers light up can someone post? the vid is below! you can see um at 50 seconds!

Posted by Metal4God 11 years ago

home made car heater control help needed

I have a heater control panel from a 2010 dodge journey that I want to use in a custom made kit car. The control knobs are all based upon resistance, no IC's are used in the panel. The fan speed knob has 4 positions, off/low/med/high (only uses two pins on the board connector) The temp knob has 13 positions from hot to cold in which the AC is automatically triggered from the middle position to full cold, and the heat from warm to full hot (only uses three pins, one common and one for each side of the knobs range) The 3 position selector switch (face/bi-level/floor) also uses only two pins. This board is designed for a max of 5 volts, which I already have that instructable for that. But what I need help on is how to make 3 sets of controls for the various knobs. One for fan speed one for the heat/ cold and one for the position selector switch. Im trying to find a way to create a switching action created by various voltages as they are running through the control board, that will trigger 12 volt effects for the fan speed, and a servo for the heater duct changer. The heater knob will need to turn on or off the AC, and control a shut off valve for the coolant heater control valve. But like a RC servo it would turn in relation to the voltage applied. Would transitors work in this case? Any ideas? Id like to get past this and move into the fabrication of the system. But this is stopping me cold right now.

Posted by ydeardorff 7 years ago

Wiring help

Hi guys I am need of some advice and help if possible, I will try and explain as clear as I can. I have a lockup which I have modified to use locking bolts on a motor and I have a swipe card reader and pcb which when swiped it fires the output to power the motor (6v) which works perfect for 6 seconds of the locking bolts going in and out. I am looking for a way so when the locking bolts go to the locked position it hits some kind of limit switch and stops there (which I have done in the past) but then I want to be able to swipe my card to open the bolts and when it gets to he open position it hits another limit switch and stays open until I want to swipe and close the locking bolts. I don't want this to be timed I need this to stop on open and closed position but able to operate when either is pressed, Can this be done in anyway?

Posted by sherpin2000 6 years ago

Subtle SPAM?

I have found a member of Instructables that makes positive comments on many different projects but the link at the bottom of the person's comment takes us to different businesses. I suspect that it is a form of SPAM. Would someone please investigate?

Posted by blkhawk 6 years ago

I want to make a sensor which can detect the dingo trap movement

Hi guys, I want to make a sensor which can detect the dingo trap movement as I want to know if any dingo is trapped or not. I want it connect it with a dragino MS14( in 14 positions screw terminal). I have many traps in my farm and my part is to make a sensor and find a way to connect it with dragino MS14 14 positions screw terminal. Else will be handled by my fellow participants in the project.  Does anyone have a any kind of knowledge about it?

Posted by ramn0004 3 years ago

Motor Question

I have two motors I am using as wheels, but they both spin in the same direction making my robot spin in circles. Can I change the direction a motor spins? Maybe by switching positive and negative sides?

Posted by Soileau 10 years ago

6volt powering locking bolts but need diagram to wire limit switches

Hi guys I am need of some advice and help if possible, I will try and explain as clear as I can. I have a lockup which I have modified to use locking bolts on a motor and I have a swipe card reader and pcb which when swiped it fires the output to power the motor (6v) which works perfect for 6 seconds of the locking bolts going in and out. I am looking for a way so when the locking bolts go to the locked position it hits some kind of limit switch and stops there (which I have done in the past) but then I want to be able to swipe my card to open the bolts and when it gets to he open position it hits another limit switch and stays open until I want to swipe and close the locking bolts. I don't want this to be timed I need this to stop on open and closed position but able to operate when either is pressed, Can this be done in anyway?

Posted by sherpin2000 6 years ago

Feature rich servo controller

Hi All, I'd like to write a servo controller that allows another system to offload some of the low level motion control work to the controller. This is primarily for amateur robotics applications. I'm trying to work out whether a controller implementing the features below would be replicating effort of existing open source drivers and not really worth the bother. Has anyone come across an existing controller that can some/any of the following? Position feedback Alterable traversal rate(s) changeable in real time (mid motion) Different seeking modes (acceleration, stall detection, hammering, error margins) Different communication modes (position queuing, position interrupts, upstream arrival and stall messages, etc) and so on... I'm looking at doing this probably with an Ardunio Nano and controlling as many servos as possible, but the primary goal would be feature richness. I could also see applications for an Attiny version (1 controller to 1 or 2 servos, limited feature set). Has anybody got any thoughts on the idea? Thanks in advance, Andy

Posted by andy 6 years ago

Grounding Issue in DIY Circuit

Hello everyone, I'm having a bit of a problem getting my LM317 soft-start circuit to function properly. If you'll take a look at my schematic, I've built everything on the schematic up until the relays and diodes get involved (specifically where the output forks into two). In order to check that I soldered the board correctly, I hooked an LED up to where the fork would be to make sure the soft-start worked. Here's where things get funny: If the LED is connected to the rectifier's negative, the LED behaves as I expect it to, with a slow turn-on. However, if I keep the LED connected to the same positive point, but hook the led directly to ground, nothing happens. In fact, using a multimeter showed that no voltage would flow to ground from the positive, but that 14 volts were flowing between the same positive point and negative. I need voltage to flow to ground, this is a ground safety interlock for a welder I'm working on... does anyone have any suggestions? Thanks for reading :)

Posted by reakter 6 years ago

Connecting a 12v led computer fan to a biltong maker

Hi All, Please can someone help me, I want to connect an led computer fan to my biltong maker, and in order to do that I need to connect it to the power that i switch the light on. CoolerMaster A8025-18CB-3BN-F1 It is a DCV   0.18A it has 3 wires, none of which show positive or negitive, and I need to connect it via the positive/negative wires in a 2 pin plug. Does anybody know how to do this? Do I need a transformer?  Please could you assist.  Annie.J

Posted by annewynne.jackson 5 years ago