Buzzer for Hot Water with 10 min timer

Hi Team, I want to make a 220v buzzer with timer 10 min. My thought is to control my electricity bill by reducing  water heater usage. This buzzer will help me remind me that water heater is on for 10 min so that I can switch it off to save power. I know it is seemed to very easy for pro guys but very difficult for me. Please help me understand and make such buzzer with minimal budget. I need help to make this project. Kindly let me know how can I do it.

Posted by vindude5 2 years ago

buzzer with custom sounds?

Does anyone know how to take a buzzer similar to the one pictured and give it a custom sound and not just the "errrrrrrr" thing?

Posted by hannahdrew2 9 years ago

Buzzer for Gyser with 10 min timer

Hi Team,   I want to make a 220v buzzer with timer 10 min. My thought is to control my electricity bill by reducing  gyser usage. This buzzer will help me remind me that gyser is on for 10 min so that I can switch it off to save power. I know it is seemed to very easy for pro guys but very difficult for me. Please help me understand and make such buzzer with minimal budget.   I need help to make this project. Kindly let me know how can I do it.

Posted by vindude5 3 years ago

How can I get a loud alarm?

Ok so I need an alarm for my project, a very loud alarm. . . And I can't seem to get these dumb buzzer to output a decent sound. I have a lipo checker that uses these type of buzzers  and they are ear shattering. I tried putting the regular buzzers and the were no where near as loud. Also if I want to use the tone function on the arduino, how do i make the buzzer louder?

Posted by HavocRC 3 years ago

custom dead-man switch with buzzer

So I am in need of something handheld with a "dead-man switch" that activates a buzzer or some type of alert if you let go. The buzzer would be silent as long as you hold the switch and go off when you release it. Probably build the whole thing into a small piece of PCV so its hand held. I don't know where to start with the "dead-man switch", any suggestions? 

Posted by jtichinel1 4 years ago

Looking to activate a loud buzzer with a board speaker...

I have a home security system (fortress SO2) and the door chime only comes thru the little board speaker.  We have a loud shop and sometimes we are in the back and cannot hear when someone enters.  I would like to activate an external buzzer with the speaker chirps.  I've search the interweb :-) and haven't been able to find something that will for sure work. I'm no electronics guru but I can follow instructions or would pay if someone wanted to build me something that would basically activate a momentary switch every time the the little speaker chirps and I could wire up the buzzers from there.  edit: I can solder if needed

Posted by wannab1 2 years ago

4mm buzzer

Hello everyone, I'm looking for a way to make (or hell even buy) a very small buzzer that can be rectangular or cylindrical that is 4mm in diameter and can be up to 10 mm long.  I've searched on Digi Key for something this small, but most things are about 8mm in diameter and 4mm long.  I need something skinny and long, not short and fat. Does anyone have any experience with this? Thanks

Posted by SJBoard44 7 years ago

Display buzzer

I am not good at designing electronics. Could someone point me in the direction of a suitable circuit to do this... I have a device with a backlight on an led display, the backlight is normally on but can be switched off sometimes the backlight flashes to alert the user. on for 1 sec, off for 1 sec approx. I want to add a circuit to it without changing the existing circuitry when the backlight comes on I want a buzzer to sound for 1/2 sec if the backlight is on then nothing happens, nor should it buzz when the light goes off. So: 1. switch on device, backlight comes on, Buzz 2. backlight is on for length of time but no buzzing 3. backlight starts flashing 4. goes off, No buzz 5. goes on, Buzz 6. repeat from 4 until the backlight stays on this circuit and buzzer is going to have to be very compact to fit in the device. I might substitute a phone vibrate for the buzzer. Any suggestions ?

Posted by scubascooby 9 years ago

How do you make an annoying buzzer?

I want to do a practical joke at work.  I want to use IR LED'S to make a sender and receiver so that when I push my remote it will activate the buzzer, but when I let off of the button, the buzzer will stop. I am assuming that the sending part would be easy, pretty much a battery, button, and perhaps a resistor (and the LED), but how would I make the receiver so it will set off the buzzer? Thanks! Edit: I just went to radio shack and got this emitter and detector: I also bought this buzzer: I did a quick hookup (with electrical tape).  I used a momentary switch from an old computer for the emitter.  I know it was working because I used my video camera to detect it.   When I pointed it at the detector/buzzer nothing happened.  I was using about 2 volts, (buzzer votage is 1.5-3VDC).  I just went to the site to look up the detector and it says the phototrasistor detector is 20V at 25 mA.   On the package the max is 70 V.   My question, If I use the following configuration, should it work?  I dont want to try this and blow out  my buzzer before I get an opinion.   Thanks I cant seem to get the pic to upload here, so I put it on my site: EDIT: 12/30/09 Well, I bought a breadboard and tried to wire it up.  Not a lot of room on those things.   I used 3 9volt batteries for the receiver.  According to the site, they use from 20 to 70 volts, unless im reading something wrong.  I didnt use any resistors, which I should have.   As soon as I hooked up the power the diode burned up. lol.   Oh well, lesson learned = $1.00.  I'll have to give this  more thought.

Posted by pennsteve 8 years ago

Using Bluetooth to control simple components

I am undertaking a minor project with a friend and we need to build a bluetooth transmitter to be controlled by a mobile phone. All we need it to do is to give an electric signal on demand. Any expertise, components and suggestions people can share with us, I would be very grateful for. Merry Christmas! x

Posted by Martain 6 years ago

What are these electric components?

Hello guys I thought you could help me out with this a little bit. So I went to the dollar store looking for some. I'd like hack some to what I want, but first I need to know how it works! Um want to know what these things are on the board and what it is. So, I want to know what that black blob is on PCB and also that barrel shaped thing and why is the siren hooked up to that barrel. Thanks guys!

Posted by HavocRC 5 years ago

Fake Pokemon GO Pro

Hello! Right now the best practice to hunt pokemon is to just walk and if the phone vibrates, you look. Thant means you have to hold the phone in hand.  I had an idea for a DIY, but no way to execute it. Idea is simple: -motor vibrator from old phone -Arduino -BT module -battery Turn all above into a braclet for your hand  I owuld need an app or something that, whenever phone vibrates, it would send a command over bluetooth to arduino to vibrate. It would need to check for phone vibrate command as the app doesnt give a notification or annything.  Is the ambition too high ? Is this harder to execute than i tought ? 

Posted by compufreek 2 years ago

Buzzer Game With Reset

I would like some help with this circuit. Description: It's like a regular electric circuit Buzzer game but with a no cheating reset option. 1. One must go from A to B to light L. 2. When you start (A) a green led turns on (G) 3. If you touch X, the buzzer sounds (S) an a red led (R) turns on, at this time (G) turns off. This means you have to restart from A 4. this must be powered by a 9V or 12V battery

Posted by RicardoA53 2 years ago

Help me make a buzzer system for my classroom.

I am a Philadelphia public school teacher and I would like to make some type of "ring in" or buzzer system so small groups of students can compete in review games. Ive been trying to do some research with LED's and simple circuits but I dont have the know how to make sense of it all. I am certain that someone on this site does. If you could help me out or point me in the right direction my students and I would greatly appreciate it.

Posted by wlegat 9 years ago

LCD Display, button and buzzer. Arduino?

This would be my first electronic project, and I'd like to get the advise of the instructables community. I want to build a gadget that when you press a button, a 2 digit number displays on one display (or one section of a display) and a countdown clock displays on another (or the other section of the 1st display). When the timer reaches 0, the buzzer goes off, or if the user pushes the button again, a new number is displayed and the countdown clock starts over. Seems pretty simple. I don't need a fancy display, probably a 4 bit clock radio type display. I would program the logic to display the number and how much time it will count down. Is an arduino the best application for this type of project? It seems a little overkill for what I'm trying to do, plus the cost of the arduino and parts would make making a bunch of these very expensive. If the arduino would be good for prototyping this, could it be made cheaper in a semi-mass produced fashion? Thanks for your help.

Posted by darkpedro 8 years ago

Quiz Buzzer Lockout System help needed

Hi all. my church has task us youth to design a quiz buzzer lockout system type of thing to be used for a bible quiz. so the host will ask a question and 8 people will try to be fist to press their button... the fastest button will lockout out all 7 other buttons so they wont buzz... after he answered then the host will press a reset switch and continue with the next question... i did a ton of research and always end up with arduino arduino arduino... and the instructions is all for 4 or so people and its not very clear to understand or easy to do. i know a bit of programming so that wont be a challenge. i love electronics so that wont be a problem. i just need a clear set of instructions to follow and some guidelines and parts to buy... (im 14 years old... )  the quiz is end of march. it for 8 people cause 8 youths of 8 different churches will compete.  if anyone could give me a plan or guide or point me in the right direction that would be super !!! i know im gonna need some wire... allot of wire... and an arduino... thanks in advance to all you wise folk :) oh btw i live in cape town...

Posted by moppyking 3 years ago

Would this schematic work?

Will this work? it's based on, what it should do, is when I aim the IR emitter (TV remote) at it, it'll go off for a few seconds. The goal is to hide it and piss off whoever is watching TV, and changing channels.

Posted by cvxdes 10 years ago

Arduino + Wifishield + buzzer + hc sr04

Hey, i started a project, i will explain it: i will try to measure a distance mit an arduino and a hc sr04 and sending the distance information to an monitor/pc/smartphone. Has anyone done something like this yet? thanks for helping.

Posted by MaximilianS2 2 years ago

Advice for a buzzer element

Hello I am developing a small device which requires  a sound alarming. The idea of the device is to be attached to your phone for example and if you wonder where your phone is, the device will turn on the sound alarming in order to give you information for its location. So, I am searching for a buzzer element which: - consumes up to 3.6 V; - is small (diameter up to 20 - 25 mm) and thin of course; I decided to use a buzzer element similar to this one but I am not sure if it will do the job. I am concerned about something else, I have a buzzer at home which produces sound of high frequency and when you close your eyes it is absolutely impossible to find out where the sound comes from. Can somebody help me, please? Thanks a lot!!!

Posted by paveltashev 3 years ago

Arduino knock sensor with a twist

Hey there! I live in a dorm and there's no preinstalled doorbell so i thought i'd do something funkier. I've used the stock Arduino Knock code and modified it a bit so agitating the piezo will make a connected buzzer beep. The problem is that while the entire setup is working, the buzzer itself is very very quiet. With a pure tone making script the buzzer will make a loud BEEEP, but combined with the knock code it's extremely quiet. I'm new to Arduino's so please bear with me when i show my code (most is copy/paste to fit): /* Knock Sensor      This sketch reads a piezo element to detect a knocking sound.    It reads an analog pin and compares the result to a set threshold.    If the result is greater than the threshold, it writes    "knock" to the serial port, and toggles the LED on pin 13.      The circuit:     * + connection of the piezo attached to analog in 0     * - connection of the piezo attached to ground     * 1-megohm resistor attached from analog in 0 to ground       created 25 Mar 2007    by David Cuartielles    modified 30 Jun 2009    by Tom Igoe  */   // these constants won't change: int speakerPin = 9; int ledpin = 13; const int ledPin = 12;      // led connected to digital pin 13 const int knockSensor = 1;  // the piezo is connected to analog pin 0 const int threshold = 10;  // threshold value to decide when the detected sound is a knock or not // these variables will change: int sensorReading = 0;      // variable to store the value read from the sensor pin int ledState = LOW;         // variable used to store the last LED status, to toggle the light void setup() {  pinMode(ledPin, OUTPUT); // declare the ledPin as as OUTPUT } void loop() {   // read the sensor and store it in the variable sensorReading:   sensorReading = analogRead(knockSensor);        // if the sensor reading is greater than the threshold:   if (sensorReading >= threshold) {     // toggle the status of the ledPin:     ledState = !ledState;       // update the LED pin itself:            digitalWrite(ledPin, ledState);     buzz(9, 2500, 500); // buzz the buzzer on pin 4 at 2500Hz for 1000 milliseconds   delay(100);    }     // delay to avoid overloading the serial port buffer } void buzz(int targetPin, long frequency, long length) {   long delayValue = 1000000/frequency/2; // calculate the delay value between transitions   //// 1 second's worth of microseconds, divided by the frequency, then split in half since   //// there are two phases to each cycle   long numCycles = frequency * length/ 1000; // calculate the number of cycles for proper timing   //// multiply frequency, which is really cycles per second, by the number of seconds to   //// get the total number of cycles to produce  for (long i=0; i < numCycles; i++){ // for the calculated length of time...     digitalWrite(targetPin,HIGH); // write the buzzer pin high to push out the diaphram     delayMicroseconds(delayValue); // wait for the calculated delay value     digitalWrite(targetPin,LOW); // write the buzzer pin low to pull back the diaphram     delayMicroseconds(delayValue); // wait againf or the calculated delay value   } } If i get this working i'll see if i can make an instructable out of it (and make a "secret knock identifier"). I ended up using this code: [url][/url] which works (code can be found by following the links) And it works! I'm still wondering what was wrong with my (pasted) code though.

Posted by Eirinn 9 years ago

Wireless activated buzzer/alarm

Can someone help me with this? I need a wireless activated buzzer or alarm. Similar to the cheap wireless doorbells where you push the button on the remote and the bell rings. Release the button, and it stops. But it needs to be a loud sounding buzzer or alarm, fairly high decibels, and did I mention very inexpensive? Also, the buzzer/alarm part needs to be as small as possible. I appreciate all your help!

Posted by wolfsmane 8 years ago

Help needed with Wire Loop Game

Hello, I wish to make the Wire Loop Game for a childrens' fun-n-fair. But I wish to add a simple SCR/circuit so that the buzzer sounds continuously instead of momentarily, once the loop touches the other wire. Can someone please show me or direct me to a website with a simple SCR, which is easily available (in India since I'm from there) circuit that can do the job? Any help greatly appreciated! Thanks, Deboo

Posted by deboogeek 7 years ago

DC buzzer/noisemaker that doesn’t use a transistor?

I’ve got some nice homemade field phones I made out of old carbon microphone handsets.  I’ve currently got DC piezo buzzers for ringers (which have transistors in them). I want to them to be able to survive an EMP, so I don’t want to use transistors. Is there anything I can use for a DC buzzer/noisemaker that doesn’t need AC power, or a transistor?   The voltage of the phones is 1.5v - 3v dc    

Posted by instrucables360 2 years ago

the laser trip alarm

Https:// I find this project absolutley great but I want to know if there is a way to make it so when the alarm is triggered i can be notified without having to look at the LED on the circuit board. so for example i have the laster and circuit board at the enterance to my house, and im in the basement 1 floor under, is there a way to make it so a light or buzzer is triggered where i am as opposed to upstairs?

Posted by astrozombies138 11 years ago

Alarm using RTC.

Hi, I am new to arduino and RTC DS1307. I am trying to create an alarm using RTC and arduino. I have a buzzer that I have connected to arduinio and also I have connected RTC module to it. I am programming the arduino in such a way that whn the timer runs off, it produces a sound from the buzzer. I am trying to use Time.h and TimeAlarms.h libraries. I dnt know how can I make the timer buzz the buzzer.  This is the code I ve done so far.  #include #include "RTClib.h" #include #include ; RTC_DS1307 RTC; void setup () {     Serial.begin(57600);     pinMode(4, OUTPUT); // set a pin for buzzer output     Wire.begin();     RTC.begin();   if (! RTC.isrunning()) {     Serial.println("RTC is NOT running!");     // following line sets the RTC to the date & time this sketch was compiled     RTC.adjust(DateTime(__DATE__, __TIME__));   } } void loop () {       DateTime now =;     Serial.print(now.year(), DEC);     Serial.print('/');     Serial.print(now.month(), DEC);     Serial.print('/');     Serial.print(, DEC);     Serial.print(' ');     Serial.print(now.hour(), DEC);     Serial.print(':');     Serial.print(now.minute(), DEC);     Serial.print(':');     Serial.print(now.second(), DEC);     Serial.println();     Serial.println();        delay(1000);             //Somthing sould come here to make the buzzer buzz     soundBuzzer(); //sounds the buzzer        buzz(4, 2500, 500); // buzz the buzzer on pin 4 at 2500Hz for 1000 milliseconds } // This is the function to make the buzzing void soundBuzzer(){   } //This is for the buzzer. It produces a beep. void buzz(int targetPin, long frequency, long length) {   long delayValue = 1000000/frequency/2; // calculate the delay value between transitions   //// 1 second's worth of microseconds, divided by the frequency, then split in half since   //// there are two phases to each cycle   long numCycles = frequency * length/ 1000; // calculate the number of cycles for proper timing   //// multiply frequency, which is really cycles per second, by the number of seconds to   //// get the total number of cycles to produce for (long i=0; i < numCycles; i++){ // for the calculated length of time...     digitalWrite(targetPin,HIGH); // write the buzzer pin high to push out the diaphram     delayMicroseconds(delayValue); // wait for the calculated delay value     digitalWrite(targetPin,LOW); // write the buzzer pin low to pull back the diaphram     delayMicroseconds(delayValue); // wait againf or the calculated delay value   } } I am really bad at programming so sorry for mistakes. But please I need help.

Posted by Bam Boy 5 years ago

Would this require Programming?

Hi! I'm building a laptop bag alarm for a project I'm working on, and I'm pretty new to electronics. Would anyone know how I could make a system where a switch would be flipped to turn 'the alarm' on or off, and when that switch is flipped, the system would do nothing when the security system is triggered. The security system being 3-8 LDR sensors inside the bag, that will trigger some sort of logical part, that would be able to make the decision whether or not to sound the alarm, based on the status of the switch (flipped or normal)  I'm a programmer, so the system looks like this to me:  IF ALARM_SWITCH_ON && LDR_TRIGGERED { TRIGGER LIGHT && SOUND }  IF ALARM_SWITCH_OFF && LDR_TRIGGERED { DO NOTHING }  ELSE { DO NOTHING } Anyone know how this could be made with circuitry? or whether it would require programming? If it required all circuitry, is there anywhere I could get help with drawing up a circuit diagram?  Cheers & Thanks!  Karan

Posted by KodeKaran 7 years ago

circuit diagram requst

I am making a life sized 'operation' game for a fund raising event. I am fine with construction and artwork, but need a circuit diagram for the electronics, can anyone help please? Doyou recall the kids operation game where you have to remove bones without causing the buzzer to sound or the red nose to flash? I want a circuit (battery powered) which when tripped by some one touching the probe against the metal edge will make the nose flash for about three seconds and also trip the buzzer to sound for about the same time. Any one know how to do this please?

Posted by batjonesy 10 years ago

electronic switch

Hi, i'm a bit new to electronics. I was wondering if its possible to turn on the flow of current by another electrical signal. Yes, i know about transistors and relays but these switches turn off as soon as the second current is stopped, how to make this change in switch permanent, i'll be precise, i'm working on a laser alarm system, and it works fine, but the thing is that when i block the laser, sure the buzzer goes off, but when the obstruction is moved, the buzzer turns off, how can this be kept on until turned off manually by a switch. i know it must be quite simple but i dont know, please help thanks

Posted by walee 1 year ago

Piezo Disc

Can anyone enlighten me on the uses of the flat bi-metal piezo discs that have two leads (red/black) ? are these only good for more complex circuits or is there a way to make them create noise like a piezo buzzer? Thanks

Posted by chuckers 4 years ago

Solar operated timer - NEED Help Please...

Hello everyone!I need help!I have an idea of a product I'm designing to get accepted to a design school.I need help since I have very little knowledge in electronics.I need a circuit for a timer... an egg timer with a twist (I think)Should have a switch (click type), 1 Buzzer, 6 indicator LEDs, and I take it that some kind of Controller (I have no idea what kind) and should work with solar power.Should work as follows:You press the switch once - one LED is lit and the timer count back 10min. and then the buzzer will go off. press it twice - 2 LEDs are lit and it will count back 20min till the buzzer goes off... and so on up to 60min.If 6 LEDs are too much for Solar power, 3 are also OK (30 min timer) or NO LEDs, but a "beep" indication for each press / 10min. time.I hope it's possibleAnd thank you all for your HELP!!!Take a look at the attached picture... Just to get a laughET

Posted by etgalim 11 years ago

Part Suggestion

I'm planning on pranking a friend by hiding a really loud buzzer in his house but I need some sort of way to be turned on after a certain amount of time (so I can get away) any suggestions? (preferably cheap ones)

Posted by Undemption 7 years ago

Stupidly simple circuit question - answered.

OK, so I accidentally volunteered to make an X-factor type buzzer board for a school event. Three switches.  Throw each switch, in any order, a light comes on. Throw the third switch, in any order, and a buzzer and/or fourth light comes on. It's a simple circuit.  Must be.  Just a few transistors, LEDs and batteries. But, I just cannot work it out! I should be able to sketch it out in my sleep, but my brain will simply not cooperate. I'd prefer to use a single DC power supply, up to 12V (multiple LEDs to make the lights brighter), but I have several I can use if required. Dimensions are not important, I'll just change the lengths of wires. But, can you help with the circuit? >K< Thank you, Lemonie!

Posted by Kiteman 8 years ago

Life Size Operation Game

I am making a life sized operation game for a fund raising event in my village. You know the kids game where you have to removed plastic bones from a flat cardboard patient without making the buzzer sound or making his nose flash? I am fine on making the game but am in need of help re the electronics. I want to make it so that if the person handling the tweezers closes the circuit the nose flashes for two or three seconds before swirching off, and also at the same time I want the buzzer to sound for two or three seconds before switching itself off. Can anyone please help re this? I need a circuit diagram that will do this. I intend to power the project with batteries. Thak You in advance. Jonesy

Posted by batjonesy 10 years ago

RTC Alarm using serial monitor

Hi, I have an arduino UNO and RTC DS1307. I want to make an alarm that just displays on the serial monitor of arduino UNO. I can make the RTC show the right time on the serial monitor, however I want an alarm to go off on the serial monitor. Also, is there any way that I can change the alarm time on the serial monitor? Like I can type from my keyboard and the time changes? One more question, How can I make arduino do multitasks using RTC. Like when the alarm goes off, it can run a small DC motor and also a Pizep Buzzer.  Please help me with this, as I desperately need a help :((

Posted by Bam Boy 5 years ago


Can any body make some sort of arduino device that shoots something at and intruder crossing a tripwire. I know you get those fairly simple set ups which consists of LED, a laser, buzzer and photosensitive sensor, but this would be interesting. Thank You Super Me

Posted by NebulaIX 2 years ago

I will pay you to make my Idea!

So basically I want a very simple device which is just a little buzzer and either some kind of laser sensor or even bits of string. I want something that can be worn that makes a noise when the wear slips out of good posture. I am sure this could be easily done. All quotes will be received and considered.

Posted by moogle123 5 years ago

D-Flip Flop and Clock Alarm

Hey there! I'm trying to hook up one Set Pin of a 74LS74 Double D-Flip Flop to the alarm of my clock. I've already desoldered the annoying buzzer thats been there before and am now measuring the voltage provided to the buzzer. Unfortunately the circuit only provides around 0.1-0.7V (crescendo alert) with each beep, which doesn't seem to be enough to raise the Set Pin to HIGH (0.8V min. I think). So I guess I'm supposed to use some kind of transistor now. Just to make sure I'm asking you guys. Also, if I want to run the clock from a 5V DC wall wart instead of the original 1.5V battery, I suppose the only thing I need to add are some resistors in series. Would that be correct or would there be anything else needed to ensure the clock takes no damage? Would be really nice if someone could help me out with this! Best regards, Philipp

Posted by Christoph680 7 years ago

Project in mind. Need ideas for simplicity.

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.

Posted by alienmemebr 6 years ago

Which Processor?

Hello everyone. I'm new here and I have a quick question about processors. I'm working on a project that requires a device to take inputs piezo buzzer elements and trigger an LED. The catch is I need a programmable chip so I can have pre-set outputs on the LEDs. I'd need something that can be rewritten (like an EEPROM) I've been thinking abuot using a PIC or a BASIC Stamp but I'd though I'd do a bit of research first.

Posted by mrpaps 11 years ago

Leonardo - Warning System + Voice Recognition

I designed and built a warning system, using 3 sensors, that detect when an object is approaching. The system also has a toggle switch and a buzzer. When the toggle switch is in the OFF position: If there are no objects nearby the LED turns GREEN, if either sensor 1 or 3 detect an object the LED turns YELLOW and finally if the object is between sensors 1 and 2 or 2 and 3 the LED turns RED. When the toggle switch is in the ON position:  Same as OFF position + buzzer  beeping depending on color of LED. Now I would like to add voice recognition to my system. I purchased a JY-MCU Bluetooth Wireless Serial Port Module and was able to test it using a simple program that changed the color of my LED depending on the command I gave it using my phone. My problem now is that whenever I tried to add the voice recognition capability to my warning system its not working. The code I'm using makes sense but I'm new at this so I might be missing something. I'll be posting 3 codes: 1)Warning System 2)Test for Voice Recognition 3) Current non-working code.

Posted by c_MOS 3 years ago

CNC, Hidden Bookshelf, Easter Crafts

  Hidden Door Bookshelf Car Mods Kids Easter Crafts Quiz Show Buzzer System DIY 1000 Watt Wind Turbine Easter Eggs Dyed with Onion Skin Easter Paracord Bracelet Easy Desktop 3-Axis CNC Build a Green House Simple CNC Motor Controller Chainmaille from Pop Tabs Use your Laptop as Xbox 360 Wireless Adapter Paracord Wrist Lanyard Wire your House with Cat 5

Posted by randofo 8 years ago

electronic diagram to pcb

Hi i need anyone that can help me with this diagram,i think its okay,at least thats how i have it in a breadboard and it works,basically its a 555 timer delay on (5secs) and then the buzzers beeps reallly fast,seems simple but one bad conection and it wont work when the pcb arrives,(it happened already,)the not conected pins seems crazy maybe but it works i have everything in breadboard,i hope someone can help me please thankss have a great day :)))

Posted by NelsonN2 3 years ago

One Transistor Based Code Lock

Hello All, i have tried really hard to search for a Instructable based on the above topic, i do remember that i saw it in this site but now i cannot find it, the circuit is, please link me to this Instructable, i would be really thankful to all of you. ALSO HOW CAN I ADD A BUZZER WHEN A WRONG CODE OR COMBINATION IS ENTERED.  ALSO WHAT TYPE OF SWITCH OR PUSH BUTTON SHOULD I USE PLEASE GUIDE ME.

Posted by khan12 5 years ago

IR trip wire with discreet components

I am in need of help and I am going insane with this. Question is about a simple circuit with IR sensor/tripwire part and 555 timer which would keep the alarm buzzer on for thee seconds. No fancy stuff like arduino or relay or anything like that just LEDs, resistors, transistors, 555 timer and a buzzer. I got the IR sensor part to work and the timer part to work, but when I try to combine them everything goes haywire and nothing works. I have IR photo transistor TOPS-030 as the IR sensor. I am really starting to lose my mind with this and it has been three years since I started doing this project. I got diagnosed with undefined neurological disease (probably MS-disease) which has slowed my down even more. I worked on the circuit every now and then not every night during the past three years =) I know this circuit is simple and it can be put together in a brief moment the thing that is driving me crazy is the fact that when I got something working then everything goes haywire. Doing very basic beginner instructable describing this circuit would be very helpful even to others not just me. It would also keep the knowledge of using discreet logic up in these micro controller days.

Posted by msiren 1 year ago

Help with idea: Reminder device for correcting posture

Hello. The reason: I have terrible posture trouble (as many people do) and my work as an artist often leads me to spend a lot of time sat in out of the way places in fairly un ergonomic set ups.  It is hard to remind yourself to sit up straight while you are concentrating on something else and I often find that due to my absorption I have been sat slouched over a painting for hours at a time and now have a terrible back and neck ache. I don't think buying a brace is the way to go as that only solves the problem while you are wearing it and you stop using the muscles that keep you upright which over time worsens the problem. The Idea: So the perfect solution would seem to be something light that you can wear that will monitor your posture and either sound a little buzzer or even give you a little zap to remind you to sit the hell up thus slowly training you to sit up straight as a matter of habit. The only thing i could think of  is some kind of simple device with elastic or string you can attach to your waste, shoulders and back of the head that when you slump forward would pull on the string and sound the buzzer. I have no Idea how to make such a thing and would value other peoples thoughts on the matter and any technical no how.

Posted by moogle123 6 years ago

Flies - and how to repel them?

Hi, My parents live near a cow farm, and in summer, there is a major problem with flies. Over the years, the house has had most of it's orifices closed with fly & mosquito screens, but even so when eating outside, or playing in the pool, the little buzzers are a real pain. For the moment, nothing really seems to work on repelling flies. What works for mosquitoes does not apply to a fly, a part from fly swats & screens... Does any one have any natural or electronic fly repeller that really works? Cheers, Bpfh

Posted by bpfh 9 years ago

Short range battery operated 2 part (door alarm type) distance sensor.

Hello all! I'm looking to design a range compact distance sensor that will sense 1-4 ft increments. If necessary i could modify a door alarm. id like to fab one or multiple if need be to sense the distances noted. I could utilize a buzzer or some way to record a voice that would alert to said distance. The battery voltage max is 4.2v dc and if it could be rechargeable that would be a plus. Any help on this would be greatly appreciated. Thanks!

Posted by Automan350 10 months ago

PIR motion detector

My roommates and I decided that we wanted an electronic project to work on and we chose to try out making a motion detector. The only thing is, we really have no idea how.We have this PIR sensor, a small PC board, some wire, a buzzer and soldering equipment.My question is, how can we make a motion detector that buzzes when it senses motion? What more do we need to buy?We have looked online but couldn't find anything for people that really have no idea what to do.Thanks for any help!

Posted by gohuskies 9 years ago

can anybody tell me why my return command in void loop isnt working?

Int keyscan() {     const int keys[12]={     1,2,3,4,5,6,7,8,9,10,11,12                  };       int r=0;   int c=0;   int keypress=99;   int ColState = 0;    //variable to store column state, 0 = low } const int led2pin = 10; const int led3pin = 9; const int led4pin = 8; const int buzzer = 12; const int LidSw =  13; const int ROW0 = 7; const int ROW1 = 6; const int ROW2 = 5; const int ROW3 = 4; const int COL0 = 3; const int COL1 = 2; const int COL2 = 1;   int keypress=99;    int r=0;   int c=0;   int ColState = 0; void setup() {   pinMode(ROW0, OUTPUT);   pinMode(ROW1, OUTPUT);   pinMode(ROW2, OUTPUT);   pinMode(ROW3, OUTPUT);   pinMode(COL0, INPUT); pinMode(COL1, INPUT);   pinMode(COL2, INPUT);   }   void loop()   {while(keypress=99)   {               for(r=0; r<4; r++)                          //loop for 4 rows     {       digitalWrite(ROW0, HIGH);       for(c=0;c<3;c++)                          //loop for 3 columns       {         ColState =  digitalRead(COL0);         if(ColState==1)         {           digitalWrite(ROW0, LOW);  //reset row           tone(buzzer, 450, 500);           ColState = 0;                //reset ColState variable           keypress = ROW0+COL0;    //identify key pressed           delay(500);                  //debounce         return keypress;         }       }       digitalWrite(ROW0, LOW);     }   } }

Posted by endara 5 years ago

2 small more microcontroller questions...

Getting it in the mail soon, so I might as well ask while i wait. 1: Can you put 9V into a input, and out a output.. or is that way too much for the poor guy? 2: Do micro controllers have ability's to read voltage on the input? Like if I want to say when its lower than 1V on input0 it will open output 0 (which sounds a buzzer) for beginner projects. I don't expect examples. I example a yes/no answer. If you feel you need to give an example, feel free. Just don't want you guys to think im requesting codes!

Posted by Killa-X 10 years ago