Can someone explain to me how a Schmitt trigger works like I'm a 5 year old? Thank you
Topic by Grizzly_Bear | last reply
Hello, I'm an absolute beginner and I would appreciate some help. I need to build a sensor that triggers sound either on Pro Tools/Logic Pro/Garage Band or any other kind of audio software when it detects a single red flash of light on it, much like the light a laser pointer would produce. The light will flash from left to right in intervals of 2.5 or 5 seconds apart. The sound is nothing too complicated. It's basically just single notes, pitched a fifth apart so for example, when the left light flashes, it needs to trigger middle C, then when the right light flashes, it needs to trigger G above middle C. Problem is, I do not know how to go about this and where to start. I would be deeply appreciative if someone could help me out here and point me in the right direction. Thank you!
Topic by shuraifa | last reply
It has come to my attention that there is some controversy surrounding Knex gun triggers. I know very little about Knex guns and have become extremely curious as to why this was. What is a block trigger and why is it inferior to other forms of triggers?
Topic by randofo | last reply
I was messing about with my knex trying to think of some ideas and then I decided to make a mp7 but the handle is near to the middle of the gun so if you put a normal trigger in the gun it will have a bout an inch when you pull the pin back so I wanted a trigger be hind the mag and I came up with this if people want a video showing how it works just post comment and ill have one put up
Topic by knex mad | last reply
Hi, I'm making an Arduino powered NFC trigger? I want to control it from my phone. As soon as I switch my phones NFC ON, the Arduino should get triggered. I'm aware that the circuit will contain an Arduino board, a nfc shield , relay. But I need to do this on a budget. So i need to know which is the cheapest Arduino capable of doing this. Also if someone could help with the code. I'm pretty good in electronics. But just started learning the Arduino. Basically heres how it should work. Switch on NFC on smartphone. Go near circuit(Arduino-NFC-trigger) NFC sheild gets activated. This gives input to arduino, Arduino gives output to any output pin. After sometime output stops.
Question by Jonathanrjpereira | last reply
Why is everyone so hyped up about knex block triggers, you dont have to go to the block trigger instructibles. If you do go to thier instructible you dont have to tell them thier gun sucks. This whole knex gun thing started out as block triggers.Back then Every one liked them and almost every instructible was block trigger. When oodulumps, Mepain, and all the other good knex builders came in,they started making all this cool stuff that was different than block triggers. After they posted all the cool stuff they had going on, new people came in ,and got inspired to make knex guns. They wanted to post thier guns , so they did. And now that all the older people are so tired of block triggers, they send bad comments to people who are new to knex guns. Which I think is wrong because they are at the level of knex guns that we used to be at one year ago. They only difference is that they came later, and dont know as much as we do. If anyone disagrees with my opinion please comment on why you disagree. Sorry if I had any misspelled words in this forum, or if you did not understand. Please tell me if you do not understand and I will fix that.Thank you for reading.
Topic by fobblewabble | last reply
Hi All, I'm somewhat new to the DIY home tech space, so hello :) I'm trying to create a small piece of hardware for a game I'm building at home. The idea is similar to something you'd see at a carnival or fair... throw a ball at an object attached to a lever, when the lever moves have an LED array flash. I'm hoping you can provide some guidance or insight into where I might begin. I'm not looking to become a master with this so any sort of kit or maybe even plug and play pieces would be greatly appreciated. I found these LED rings that I thought might be good for the messages that flash when triggered, although I'm sure I could build them myself for a whole lot less: http://amzn.to/11ZuCTQ Thanks in advance!
Topic by sirwoodland | last reply
I'm starting this one over, I made a mess of the last topic. Essentially what I'm starting with is a driveway wireless alert system (http://imgur.com/a/RgDeG) and a car horn. The car horn is wired to a push button switch. (http://imgur.com/lg7Gbvj) What I'm trying to do is replace the [S] (switch) with this wireless trigger. The alarm speaker outputs at a very low voltage, ~0.08v: https://vimeo.com/75827101 The alarm LED's output 1.75v (measured from + on the one LED and - on the other, there are three total, in series) What would be the best place to tap in to get voltage from to trigger the relay? I think from the previous post I'll need a transistor switch of some sort? This is the part I need help with. Usage: Tractor pulling hayrack riders over a bridge, I'll place the sensors ahead of the horns so by the time the tractor is at the sensor the hayrack is right at the horns. Hope I posted in the right spot. Thanks
Topic by jinstructr | last reply
Need to build a voltage trigger, for a project. This is new for me so i need some tips to get started. the point is to build it, not to buy one. The trigger we are looking for is like the one used in this instructable: https://www.instructables.com/id/Cheap-Easy-Solar-Powered-Robot/step1/The-Circuit/ Appreciate any help I can get. Cheers=)
Question by Robootzz | last reply
Yeah... So how do sear triggers work? And are they better? And why?
Question by TigerNod | last reply
Want output from headphone jack to power relay to turn on power amp
Question by gramparich | last reply
hey guys, im looking to build a IR triggered LED strobe. in the smallest possible size i can. it doesnt have to be from scratch so if anyone knows of a cheap trigger on a toy i could use that would be great. im looking to build an IR triggered strobe for an airsoft gun i have. the idea is to strobe an led (most likely a UV LED) every time an airsoft pellet trips the trigger. these pellets are glow in the dark so in essence i will be making my own homemade airsoft tracer system. these units are about $70 so if i could do this for free or much cheaper i would be thrilled. i know there are things out there i can use but im drawing a blank right now. i have makers block or something. here are a couple links to YouTube vids that explain the concept and more along the lines of what it should be like. at about 1:50 in the top video theres is a good demonstration on its workings. <br> <br> any part suggestions or ideas would be awesome.
Topic by gedion4000 | last reply
I know most people that think of retail exit door alarms want to avoid setting them off, but is there a way to purposely trigger them, especially from a distance? i am reasonably good with a soldering iron, ok using a ohm-meter and beginning on using oscilloscope. and i have lots of junk PC/PC parts and various other electronics around to strip for parts... (if that helps any). thank you for reading --rex
Topic by rexifelis | last reply
Hey all. What I am trying to construct is some kind of circuit that will trigger an LED when a piezo is tapped. The reason I would like to create this apparatus is to trigger lights using acoustic drums for my band's live show. I would like a light to go off every time a drum is hit and I figured that using a piezo would be the best way to do this. Any help that anyone could offer in this would be greatly appreciated. Thanks again. P.S. I found this diagram for a piezo switch but I am unsure as how i could use this or even how to make it in the first place. I am very new to electronics.
Topic by cimz
I am sooo tired of stupid mg's that only work when you turn the motor on.so, i've made a trigger system which works like this: first you load a chain into the gun. second, you turn the motor on. third you squeeze the trigger.bang bang bang aaaaaaawwwwwwwwweeeessssssssoooooommmmmmeeeeeee!!!!!!!!!!!!!no pics yet, will be be soon though
Topic by ultimachris | last reply
Hi, I wanted to make a piezo trigger that everytime it hits, it lights up a 2 meters led strip. I found a schematic, but have no idea how to read it. What would I need to get it to light up a 2 meters led strip, running on batteries. I also want it so everytime the piezo is hit, the light flashes a different color. thanks. http://www.discovercircuits.com/PDF-FILES/PIEZOSWITCH2.pdf
Question by lyoth | last reply
I have a couple fog machines purchased at Target around Halloween last year. The model has a switch on an extension cord which when pressed triggers the fog machine to produce fog for 5-10 seconds. They work great but I want to use a remotely placed motion sensor, like from a motion sensor flood light to trigger the fog machine when people walk past. I purchased a replacement motion sensor module for a flood light and looked at the wiring of the switch and the fog machine but haven't figured out how to properly wire it. The motion sensor module has a "test" setting which would turn on the light fixture for 5 seconds, I want to use this to trigger the fog periodically as people walk past. Any help would be appreciated. A couple photos to show the pieces are included. If more detailed information about the wiring is needed please let me know.
Question by cbulloch | last reply
I need some help with this heavily modded Reaper, I need a sturdy trigger to fire the crossbow, but that has been proven too difficult for me as I don't have much trigger mech experience. At one point I had it fully working when not loaded, untill it snapped the trigger when I tried to fire an arrow. :P
Topic by Wicky | last reply
What is wrong with the block trigger mechanism because I have yet to see a powerful gun without the mechanism. and the sear system has it's flaws. So what I think you hate is the mechanism and what do you think about the mechanism with the true trigger attached?
Topic by smidge147 | last reply
This is my pistol that features and new trigger system. It works well, uses only 2 pieces, and is easy to install on many knex guns. This is my first knex gun, so any positive comments would be appreciated Enjoy! ps: sorry some of the photos are dark.
Topic by redneckobsessed | last reply
Also do you think its okay to use it for a knex gun?
Question by PotatoCoffee | last reply
Hey guys last night i had an idea and straight away got buildin it (not very well cos it was 12 at night). so im gonna post sum pics a bit l8er and then if any1 on this board then maybe u might be able to make it a bit better it is a true trigger but not to good true trigger and it is a RBG so any mods will be appreciated.
Topic by knex maniac | last reply
Hi, So I just broke my friend's selfie stick while playing with it. I'm wondering how to make the trigger for that stick (wireless or wired is OK). I knew that Apple's Earpod paired with an iPhone would work as a trigger but how about Android phone (I've seen some bluetooth camera shutters but don't know how they work)? Also, if possible, suggest me few things about that monopod because this is my first time in Photography and stuff. Thank you guys.
Topic by Gandalf OftheinternetI | last reply
Is it possible to release the pulse of a marx generator at my own will (after it charges of course)? I was thinking of its possible application in a coil gun, but the fact that the generator pulses automatically would be a problem. Is it possible to create a non-automatic triggering system like a circuit that would allow me to flick a switch and watch the sparks fly?
Question by Shrix157 | last reply
Hi, I'm building a solar panel project that may use the charge battery and so on. As solar output is not consistent, I have a capacitor array to store charge before deliver it to the end devices. However if the solar output power is lower than the end devices(example charging phone) power load, it will probably on and off since the solar output is not enough. I would like to use by capacitor array to reduce the on and off rate by design a Schmitt trigger or perhaps it a flip flop circuit. For example if my Solar panel max voltage is 12v and my device using 5v thru a voltage regulator that need min of 6v. So I would like to design a circuit to do this 1) When capacitor array discharge to 6v, terminate the circuit to regulator. 2) Wait for the solar panel to charge the capacitor up to 12V 3) Upon reach 12 V, allow the current to pass thru regulator again. Repeat step 1 I tried so search Schmitt trigger circuit but I cannot find the suitable one as most Schmitt trigger is with a Vref and signal input. Since my voltage input(capacitor charging and solar panel) is variable, I do not have Vref. I still believe it can be achieved, perhaps my mind stuck at one concept only
Topic by SNC1 | last reply
Hi, my project consists of a vibration sensor that, when enabled, will trigger a motor which will function for a certain amount of time, then stop, and stay in this position as long as the sensor is detecting vibrations. When the vibrations stop, I need the motor to reverse polarity and function in the opposite direction,for the same amount of time as before then stop, and repeat... I'm a first year electrical engineer so please consider me a rookie in this field. If someone could provide me with a suitable electrical circuit, with names and values for the part, i think i might be able to draw the corresponding board. Thanks
Topic by julienfhd | last reply
Hello, I am an artist and want to do a sound installation. Basically I want a movement sensor that activates sounds. There will be about 15 different sounds and each time someone passes by the movement sensor will activate a different track. Can you help me with that?!?!? I need to know how can it be done!!! Thank you Fernanda
Topic by fernandaxr | last reply
I want to keep this brief whilst still remaining informitive, please excuse hurried typing hey guys been playing around with knex and found a mech that works. camera cable still lost, paint diagram below instead. to load band is attached to anchor at front, rod it then push/pulled through mech till trigger clickes into place, pulled further and rod is removed, ammo carefully placed back into mech (hollow back) trigger can then be pulled to fire. resultant gun is basicly silent, only one band can be used at a time. plans for a repeating version are still sitting around in my head. sorry for brief explanation, was kinda busy seeya later
Topic by Fred the Penguin | last reply
Greetings Space Cadets! I need help figuring out what sort of switch to use to activate the thermo-nuclear disruptor beam of the ray gun I'm building out of a busted battery powered drill, a smoke alarm and a battery. Bet you didn't know this combination of junk is dangerous in the wrong hands? I need a switch that will work with DC current and switch on the circuit when pressed but not stay on. Like a primitive projectile firing pistol of the 21st century this ray gun should only fire once when the power switch is pressed and not stay on continuously. Any suggestions? And yes, I'll post an 'ible when I get it done. Thanks!
Topic by 2lazy2work2nervous2steal | last reply