I want to use a hobby motor with arduino as input , do I connect it directly or I need some circuits? Thanx In Advance!
Question by Bot1398 | last reply
I am writing an Arduino program to read speaker inputs for a test station. I need only to know when a speaker lead is on or off. This will be done by using the fade and balance. Originally I was connecting the speaker leads to the analog inputs and could get a single line to work as a simple VU meter. Multiple lines gave issue. Since I don't need to know the actual level, just whether they are on or off I'd like the speaker lead to trigger a transistor connected to a digital I/O pin on the Arduino. Any thoughts or quick schematics on how to do this?
Topic by dbirky | last reply
On the two inputs of a standard comparator op amp (say for example LM741) they usually connect resistors from both the positive and negative voltage rails .Why do they do this and how does this work . This has been on my mind for a really long time . Could someone give me a really detailed explanation maybe with images if possible , cause this would be really helpful in the building of my next project .Most of the tutorial videos out there , i don't understand either. Thank you in advance
Question by Strontium | last reply
Hi ! I have this program, Finale 2005b. I've searched everywhere, and I cannot find any way to export the music I produce in there as a real audio file (NOT a midi). So, to achieve this, I have decided to record the output as the input... using Audacity , actually. To do so, I used a simple mono cable to go from my headphone to mic plugs, and set the volume to the minimum... to avoid too much amplitude going in. Now, for the use I want it, this method is way too dodgy (plenty of interference, specially each time I move the cable 1 mm...) I'm pretty sure there is some program or solution to directly map the stream around... I don't have much funds, so free would be good, and btw I work on Win32. Thanks
Topic by fxsapa | last reply
Hello everyone, I'm new to electronics and while I can usually find what I need by asking good ole' Google, I decided to try asking a forum of people more knowledgeable on the subject. My question relates to the charger input on devices with internal batteries. I have a Braun razor that can be used in the shower, and I was curious how it can go in water with the two charging prongs exposed? Thanks in advance!
Topic by alpizzles | last reply
I have an idea to do a total conversion on a cellphone, including things like a steam-driven charger, etc. The issue I am running into here is if I could, I'd want to make it rotary. I saw Randofo's PIC method for making it a USB input here but I have no clue in terms of how a cellphone works, or any of the chips involved. Sadly, my knowledge is mechanical, not circuitry. Any sort of ideas are welcome... please help me progress on what I hope to be my magnum opus of steampunkerie.
Topic by Harlequin | last reply
Plz help me to, how can i receive signal or instruction from paralel port, how should i send current/signal to its register. what equipment should i need. actually i want to develope a system in c language to control electricity of home, doors or widows, so i need to check that if the door is open or closes. when door closed then computer should indicate me that the door is closed, and same door has opened. sir plz give me guideline. i would be very very thankfull to u. ( simply tell me how current/data/signal can be sent through parallel port, current source, equipment ets, after that i will make sensers for it my self)
Hello, I have created a simple circuit where 2 10k resistors make a voltage divider. Supply voltage is 12.5V and if I measure in between the 2 resistors, I'm getting 6.3V. Great! Now I connect that 6.3V to the +input of an OpAmp. Result: the value is still 6.3V. Great! (The OpAmp is also fed with 12.5V) Now I connect the -input of the OpAmp to the supply voltage (12.5V). The voltage in between both resistors suddenly changes from 6.3V to 10.1V. NOT Great! Now I connect the -input of the OpAmp to ground (0V). The voltage in between both resistors changes from 6.3V to 2.4V. ?! The output of the OpAmp is not connected to anything. I thought that OpAmp inputs, in theory, have infinite resistance? The datasheet of this OpAmp (LT1253) sais the input resistance should be 10Mohm I also tested this same thing with the LT1497 and the results are the same. When the -input of the OpAmp was connected to 12.5V, I measured the current going into that pin, 39mA!! (Only measured on the LT1253) What's the problem here? Are both OpAmps broken? Or is there something about the way OpAmps work, that I clearly don't understand?
Question by DELETED_Electorials | last reply
I have a Coby portable DVD player that is malfunctioning in that it won't play discs, but the video display appears to be working normally. The jacks on the player are output only and I'd like to be able to switch one of them to an input jack so I could have an additional screen running off of a newer portable DVD player. Are there any known instructions out there? Is it feasible? Thanks, Jim
Topic by jimmilt | last reply
Hey guys! Another question involving buttons. I have a button and the first time that it is press I need it to be ignored. On the second button press I want it to turn an LED on. Thanks!
Topic by HavocRC | last reply
I'm building a 'time fountain' and i'm planning to make the arduino know how many droplets of water are falling each second. My ideia was to get two wires, get them really close and when there was a drop of water the circuit would close. The problem is, how do i get arduino to get readings right out of this? o (droplet) (positive) ---- ---- (analog input)
Question by Sowee | last reply
Question by chamwildenburg | last reply
I have an outdated (but retro & cool-looking) Sony Watchman FD-500. It has a powerful radio & speaker as well as a 5" black and white tube television. Although digital broadcasts have pretty much ruined any chances of getting TV signals on the screen anymore, there is a 1/8" headphone jack-sized input on the rear for "EXT ANT". i found a coax-to-jack converter that allows me to plug in video inputs like a Nintendo once i tune it to Channel 3. I was wondering if this same jack can also be used to feed in audio from an iPod or phone. Since it looks like a normal headphone jack I tried the obvious, a direct input, but something isn't going through. Here's a link to a page with photos: http://www.radiomuseum.org/r/sony_mega_watchman_fd_500fd50.html
Question by noapparentfunction | last reply
I'm having a hard time finding parts like these - is anyone aware of an RGB LED capacitive touch button? Preferably with the light and the touch sensor separate (DPDT-type, perhaps?). I'm looking to make a physical prototype of a mobile puzzle game I'm working on, and this would be an ideal input method. Thanks! -Jesse
Topic by xepherys | last reply
I've got a cheap voice changer that is hard-wired to a computer-style microphone. I cut off the mic and added a 1/8" miniplug adapter, so as to increase flexibility. I need to connect the powered headphone output of an mp3 player to this voice-changer, what is the easiest way to do so? I tried an attenuator I had lying around, but got no results (are attenuators one way?) is there a good (cheap) solution to this problem?
Topic by gschoppe | last reply
I'm having problems finding and figuring how to do inputs with mirocontrollers VIA button press >> led goes on.(I have a ATTINY2313)Outputs are as simple as PORTB = 0x10 (being hex for pin 16). Keep in mind I'm very new to micros and C. The most I've done was fast-slow blink patterns. How can i do inputs though? SIMPLE code sample is welcomed!
Topic by Killa-X | last reply
Hello, I recently acquired a seeed motor shield http://www.seeedstudio.com/depot/motor-shield-p-913.html But what i notice now is that there is nowhere to attach my Sr04 ultrasonic sensor! How do I include sensory input on my robot with this shield? Thanks bunches.
Question by TheIronHobo | last reply
I'm looking to make a rather large input selector for a propose project a coworker is looking to commission me to make. I know I can buy a board that will be able to handle about four, but I need about 20 or so selections. I'm looking to make your basic AV selection box, where if you press a button, any other pressed button will be released. Any help is greatly appreciated!
Question by DoctorWoo | last reply
Im getting increasingly intested in vbs and was wondering how to make an input window for example "Your password" and the "password" could be saved in a txt file stored somewhere, i have the start but dont know where to go from there!"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""WScript.Echo "Your computer is being hacked please enter your password to stop hacker"Set WshShell = WScript.CreateObject("WScript.Shell")Password = InputBox("Please type your password.")""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""Thanks
Topic by k_man | last reply
I want to make a batch program where I can ask an if statement but there would only be a possibility of two responses. For example if I made the batch file asked "Did you have a good day?", I would only want the user to be able to answer y or n.
Question by Dr. Kreap | last reply
I have a small project I'm working on that uses rechargeable batteries. However I want the device to stop drawing from the batteries whenever an external power source is plugged in. (The external power source would then power the internal battery charger and the main device.) Is there a chip or circuit that could be used for this? My only alternative is to modify the power supply port to include a micro spdt that will switch when plugged in. But I'd rather like to avoid that.
Topic by stalledaction | last reply
On a hand wound transformer for a joule thif wich is the input and wich is the output primary in? secoundary out?, also does it matter if the thick wire (primary) is on the bottom with the thinner (secoundary) is on the top?
Question by bushman9 | last reply
I am trying to build a box that lets me switch between 4 composite inputs and 1 component input. my TV has a component input where the Y jack also accepts composite video. i originally figured i could just get a six position switch and just switch the ground line but then i thought that would end up sending a video signal back into the other consoles which seems bad. i thought about using transistors and a picaxe or something but an option that only requires a switch would be much more pleasant. what would be the best option and where can i buy a switch with that many poles and throws or where can i buy transistors that will handle frequency of the video and audio signal?
Question by Deshmal | last reply
Hello! I recently purchased two XBee Series 2 modules for a personal project. I did everything I wanted with the arduino connected directly to the sensor but I want to try remote signal processing. I want to connect an analog sensor (or digital) to one of the XBee's pins and with the other Xbee connected to an Arduino , where I want to process data from the sensor. All the examples found on the net are made with XBee Series 1 but I hope someone still managed and XBee Series 2. I would be interested configuration made with x-ctu or terminal. Thank you!
Topic by didrau | last reply
Hi there, I am working on a personal project and would like to find a capacitive touch input device which is roughly 5x30cm in size and will give me a x,y value for one or two fingers. The resolution does not need to be brilliant - 7 bit range in the x direction and maybe 5 bit in the y direction would be fine. Serial interface which I can use with my Arduino. I would also like to get a "pressure" for each - I know this is asking a lot but the "pressure" can roughly be guessed at not by actual pressure but by perhaps an increased/decreased capacitance or the amount of the surface being covered. I only need this to determine which of the two finger inputs is pressing hardest so again it doesn't need to be precise. Would anybody know of such a device? I mean - there must be companies producing these, I'd not want to go and have a custom one made for price considerations but surely there is something vaguely close. I have looked into the possibility of making one for myself but it appears I would struggle to do something this complex with my Arduino alone and the only IC which will do this with a homemade panel (not that I have the ability to create a capacitive panel with this many pads) seems to be QProx QT1081 which only accepts 8 inputs. Any pointers or ideas would be very gratefully received :) Cheers, Adam
Topic by Adam_D | last reply
Question by s117 | last reply
I plan to do a project that will use 28 arcade style pushbuttons to activate 28 different sounds on a computer. Any ideas on products out there I can use to connect all 28 buttons to a computer, preferably with a USB cable, so it can be used in a programming language such as C++? One idea I had was to take apart a QWERTY keyboard, but I still want to be able to use my regular keyboard to use my computer. Alternatively, is there a way for two keyboards to be connected to same computer, but one of them only activates a specific program? i.e. trying to type in notepad with it wouldn't work?
Topic by Swordmasterb | last reply
How to make USB Female socket for Nippon NS68LO music system which is OEM with Suzuki Cars and do not have a USB port although the system has a facility to connect USB drive through a round 8/9 pin socket at its rear.. I have seen some good uses of USB here and hence thought of asking if you could help me out.. Warm Regards, Rahul, India.
Question by rkorde | last reply
Hi, i found an ubiquiti poe adapter 100-240v .3a input. here the q: the output is 24v .5 amps >> shouldnt the input/output-wattage be about the same (not considering losses due to conversion, heat etc)? i am confused (but then: i´m usually always, haha)bow.
Question by la xerra | last reply
hello, my question is this: I have a 2.5 inch LCD screen, a console "microboy" Specifications: Console - display my question is: I can input video in any way? ( video out jack is broke) thanks I have also a "ipaq" poket pc without battery and peripherals expansion, only sync dock and charger. thanks again and greetings from Argentina
Question by zatanclauss | last reply
I'm filling a box with multiple different speakers I have salvaged from different items. I would like to wire these speakers in some kind of sequence. Basically, I would wire one to the source, and then I would wire the next speaker to the speaker that's already been wired, using the solder to connect. Would this work correctly? Also, I have a volume switch that uses A/V connections. The problem is that it has three inputs but only one output. I would basically like to reverse this. Is it possible?
Question by metalshiflet | last reply
Hi After moving i unearthed my old, but very big screened, portable dvd player. It used a Li-Po battery which is lost and has been flat for 4-6 years, so its unlikely to work anymore, and even so, i no longer need it. What i do now need is an LCD reverse parking monitor. I have everything but an LCD with RCA inputs, so i figure, why not repurpose my DVD player. I need to know, how would i go about locating the correct area in the circuit to connect the RCA input? I know how to follow tracks, im just not sure what it is im looking for, My first thought was, follow the RCA outputs, and hope that at some point it leads to where the DVD player is producing the RCA that goes both to the output jack, and also to another processor/ encoder/ decoder which then feeds the data stream to the LCD, and all i need to do is sever the original RCA track and use my own, however before i do anything, i want a second opinion, as well as also finding out if my logic is sound. If infact the datastream from the dvd reader is being turned into a decoded datastream for the LCD in the same place that also creates the RCA output, then this wont work, as there is nowhere to put the inputs. In this case, how would i go about getting my video output to display on the LCD? how would i go about locating a decoder and conecting it up and ect, just video anyway, for the time being i dont need audio, also the audio track is easy enough to manually hijack anyway. This is a situation where i would rather spend an excessive amount of effort in getting it to work rather than buying a display. Thanks
Question by oldmanbeefjerky | last reply
Thank you for responding.
Question by PLTWcole | last reply
Well I want to make a stereo Vu meter for my computer. https://www.instructables.com/id/SOCKO0TFI36FRXJ/ I want it to be stereo but dont know how to do that. Im planning to cut a headphone to get the audio jack and thats stereo so how will that go into the scematic. (excuse the spelling its late)
Question by sunny342
I have a project in mind. I have children with a pet cat. I intend to build a charcoal filtering for a catbox/cat tree I am building. I want to use an alarm clock (easy to adjust time if needed) to activate maybe a buzzer and flashing light daily for box cleaning. The fan runs at a low speed constantly at the top of a vent tube to keep the smell controlled. I want an input to reset the buzzer/flashing light when the drawer with the litter box is opened. I have no idea how to build the circuit. I tested the filter system on a mockup box. It works fine cat doesn't notice the fan. (its 3ft up a 3" piece of PVC). The lack of smell is the reason I'll need a reminder. I could purchase an industrial programmable relay but cost is a huge factor and buying an added power supply etc for control voltage adds up. I have an industrial electrical background and no problem working with small circuitry but have never designed anything so hints and help will be appreciated.
Topic by alienmemebr | last reply
Im trying to build a circuit in which an input uses linear motion to control a rotating servo. the servo rotates clockwise/counterclockwise, and the input should have 3 inputs. turning the servo clockwise, turning the servo counterclockwise, and a neutral option so the servo doesn't have to always move; the neutral would be between the to rotation inputs. The closest form of an input I've found so far is a sliding potentiometer since it is controlled by linear motion. If there's a better input that can have those 3 inputs i'd love to know.
Question by explosive_bagels | last reply
Hi, I have an amplifier that only has one input, but I was hoping to have a bluetooth connection, as well as a 3.5mm audio jack. I was wondering if there was a way that I could do this? and that preferably it would switch automatically based on which is being used?
Topic by Fozzibehr | last reply
I am having trouble understanding the datasheet. Is there a max input current for the lm317? If so, what is it? I want to supply 4A input current to it from a laptop power supply. http://www.fairchildsemi.com/ds/LM/LM317.pdf Thanks.
Question by Dmxspider | last reply
Im trying to make an rgb led light up in different colors to based on the analog input, for instance a "potentiometer" or equivelent like the lm324 controlling the input causes the input to go higher the red turns on then green and then blue progressively, i have some code worked up but am willing to work from scratch again, im working with the lm324 op-amp and an arduino w/328
Question by redd.the.cat | last reply
I'm trying to multiplex with an arduino and a 74HC238N decoder. on the datasheet I was looking at I saw that besides the 8 outputs, 3 inputs, GND and Vcc there were also 3 "Inable Input" pins, that I couldn't figure out what they do. Can somebody please explain? Thanks.
Question by yonch | last reply
I have three 'sources' of stereo audio fed into my NAD amplifier. Each source has a different (non-adjustable) output level. So when I switch each one at the Amp input selector the output volume changes significantly. I just want to attenuate the two highest outputs with a trimpot at source before inputting to the amp, so that each are roughly at the same level. Any idea what value trimpots I can use?
Question by barrykap | last reply
I have recently bought this traffic arrow from a surplus store and i cannot find the input voltage anywhere on the net. it has a built in switch mode power supply from what i can tell and i think it is 120V AC but am not sure. the arrow is a GE Gelcore LED Traffic Signal. ANY help would be appreciated. thanks
Topic by devicemodder
Good day, question i am building a controller for my robot and i need to send the inputs(analog/digital) by xbee to my robot. now i am not good with programming i get stuck with the first line.... i want to know how i can program it to send it values over serial from xbee tot xbee on robot i didn't get anything work so far, maybe you guys cant help me with a start? Inputs -> arduino -> serial -> Xbee -> Xbee(receiver) -> arduino -> outputs(servo, lights, motors, steppenmotors) the inputs on the controller are 8 switches(digital) and 6 analoge joysticks! Prototype robot is pictured on the picture it had for now a arduino relay shield to control the motors but it will be change to a motor controller(I don't have one yet) any type is possible!
Question by mvan h1 | last reply
Hi, I have put one of these together for an ATX power supply and have come across something that I might be getting wrong.... In mocking up the LM317 circuit in breadboard (standar one found everywhere on line and on the LM317 pages), I have got the thing metering -11v to +11v??? I am using one of the black ground wires of the PSU on the black side of the volt meter, but cant figure out why I am not just getting positive voltages??? Could the diode be faulty? Or is this in fact correct? Any help appreciated...
Question by lone_viper | last reply