How to make a Clap-Clap on / Clap-Clap Off switch circuit!

Hi all!
This instructable not only gives the reader the information needed to create a clap-clap on/clap clap off switching circuit, but the logic used to make a hardware-only clap-on, clap off circuit.  More information on a hardware-only version can be found in the final section of this instructable.

This circuit employs some very simple and cheap circuitry, and a simple program. It is relatively easy to make a hardware only clap on/off circuit, but I wanted to create a circuit that required two claps to switch on, and two claps to switch off.  The claps must be in quick succession, as seen in the video below, or else it does not work, which is the entire point of the circuit =)  I will go into detail about the circuitry, and the program.  I will also do my very best to answer any questions you guys may have.  This device can be thrown together in a single evening.

The software works like this:
1) The software waits for an initial loud noise, then starts a countdown sequence.
2) If the device detects another loud noise within about 250 milliseconds, then the relay will toggle on.  If the timer runs out of time without detecting another loud noise, the program resets.
3) Once two claps have been detected, and the relay toggles on.  The software then starts the same sequence over again, only waiting to toggle the relay off. 
4) Once the relay toggles off again after detecting two claps in succession, the program resets back to the original state.

Since the PIC10F222 has a limited instruction set, I had to add in some extra lines of code.  I would have used the PIX18F1220, but that would have been over-kill.  Ah, but how I miss the BTF (Bit Toggle) instruction =)

Step 1 PART LIST:

HARDWARE:
I'll start of by giving you guys a part list.  The box and the screws are not necessary for this project, but I'll add them to the list.

PART LIST:
1x  Prototyping board (Roughly 1" by 1") or bread board.
1x 9v Connector
1x LM324 Quad Op-Amp IC
1x LM78L05 Mini 5v Regulator
1x PIC10F222 Micro controller
1x Electret microphone
1x 5v Relay SPDT or SPST
1x 2N2222 NPN Transistor
2x 0.1uF Ceramic capacitors
1x 1N4001 Diode
1x 100k Ohm Multi-Turn Potentiometer
1x 100k Ohm 1/4W resistor
2x 10k Ohm 1/4W resistor
1x 3k Ohm 1/4W resistor
1x 7k Ohm 1/4W resistor
1x 1k Ohm 1/4W resistor
1x Project Box
 

Comments

[krrran000]

I am Karan Shrestha And I wnt to build it but I dont know how to use the software. I m reading in class 11. Please help me. My email is [e-mail] or [e-mail]

[Yadi786]

Hi Patrick

My name is Riyad, I am currently building a clap switch circuit that I found on the internet for University but it is a single clap switch and I would like to change it to a double clap the hardware way but I don't know hoe to do this. Can you help me please? I don't have much time left as it is due 3days time. My email is [e-mail] if you are able to email me I can show you what circuit I am using.

Thanks a Million
Riyad

[nodoubtman]

I modified the code, if anyone want the .hex file just msg me!

Cya!
marC:)

[tt4455]

do you have the code for 16f628a

[markee2]

Nice instructables, but the project needs some engineering background i guess , or needs higher level of intellect in electrical or electronics, where ordinary hobbyist like me cant understand . 
As what i understand, this clap switch can detect false triggering from claps where it protects your circuit from turning on and off due to unnecessary sounds or unintended sounds or claps.
Very nice clap circuit actually but needs some programming.

I have a circuit here from my friend and very good for beginners like me, i guess. just see the diagram below if you are interested.  If you are interested only.
copied from: http://www.simple-electronics.com/2010/11/clap-activated-relay-or-switch-220v.html

[MROHM]

Isn't Patrick's Battery Operated circuit More Safer since He's Using A 9 Volt Battery???? Your Friend's Circuit uses 220/120 Vac which I believe is a little Dangerous for a Beginner!!! Until you get a little Experience in Electronics I would Suggest You stay with 9 Volts!!! If you still want to Dabble with Line Powered Projects get yourself a Variac/Isolation Transformer So that You can Test Your Line Powered circuit at lower ac voltage Levels,,,safety First!!!! A Variac is a Variable Ac Voltage Transformer while a Isolation Transformer Can Prevent Accidental Shocks If By Chance You Touch a Metal Chassis(Especially in Old Tube radios) It scares me half to DEATH why there are Instructables that have plans to restore tube radios WITHOUT the Use of a Variac/isolation tranformer. Remember 120/220 Vac will respect You if You respect it!!!

[leandro0012]

Where are you using the LM78L05 Mini 5v Regulator?


Can i do the circuit without this component?

I like the circuit you made. It is simple and very understandable.

[EngineeringShock]

Thanks!
If you look at the upper right hand side of the board, you will see a transistor and the regulator. They have the same package.

[leandro0012]

Thanks, a few days ago I did the circuit and it worked great! Thanks for all your help.

[leandro0012]

Sorry, I got it, you are using this in the power supply.
Anyways, why using the LM78L05 instead of using a resistor to resist 9v into 5v?

Can I do the circuit without this component ? Because I live in Argentina and it is hard to get this kind of things here.

Thanks for all, and sorry for my bad english.

[FallenSub]

Great circuit! I did this with an Arduino, but that's just an overkill..

Is it okay if I use a 5.7 volts power supply, and skip the voltage regulator? Or is it too much.

Also, how sensitive is this device? Will it work fine on a few meters range indoors without the need to clap like a mad man?

[EngineeringShock]

Hi
Thanks! I'd not change 5.7v. I'd use the regulator. However, a 7805 reguires about 6.5v-7v minimum to regulate properly to 5v.

I just completed a better version of this circuit that does not require an amplifier.

The sensitivity of this circuit is cased on your amplifiers. You can adjust them for your required sensitivity.

[jbouffard]

can this be done with a ir reciever and transmitter?

[zeneslev]

What is the purpose of the 5V pullup on the electret? Is the DC biasing really necessary?

[EngineeringShock]

It is extremely necessary. You are protecting the microphone through current limitation. The resistance of the microphone is about 1k ohms when there is no noise being detected. I have never seen a microphone circuit that has a mic connected directly to the power line.

I don't think you'd see much at the secondary end of the coupling capacitor if you placed the microphone between5v and ground, with the coup0ling capacitor connected to the power line as well.

[zeneslev]

What I mean is: why do you need to tie the electret to 5V through the 10k resistor? Why not remove the 10k and the 5V source before the coupling cap? All you are interested in is the non dc "small signal" to propagate through the amplifier.

Thanks.

[EngineeringShock]

Oh! I see what you're asking. You want to know why I am even bothering to power the microphone. There is a small internal amplifier in the elctret microphone. It isn't going to offer any sort of electrical signal (AC or DC) unless it has a power source.

[betoroma]

you could build with clap pi 10f222
I can not compile the program
thanks
roberto
 [e-mail]

[EngineeringShock]

Yes, but without the resistor, the microphone would have to load the battery in order to make a signal, which is not possible. That resistor serves a few purposes, but I guarantee that you will not get a response at the secondary side of the coupling capacitor if you tie the cap to between the mic and the 5v line. Even if it was possible, there are other capacitances (0.1u decoupling capacitor) on the 5v line that would severely interfere (If it was possible to behin with). The device would not respond at all.

[zeneslev]

Ah, I wasn't aware of the built-in FET. That would definitely require DC biasing. http://en.wikipedia.org/wiki/Electret_microphone

Nice project!

[EngineeringShock]

Thank you very much =)

[betoroma]

you could build with clap pi 10f222 I can not compile the program thanks roberto

[ssanthosh]

I want to ask that if this will work on AC Volt Input ?
if it work on AC Volt Input can i light up a CFL bulb in Output?

[nmc6903]

thanks for sharing this project. But I want to replace 10F222 by 12F675 so how can I edit the code for compatibility.

thanks

my email : [e-mail]

[smartieblonde219]

To use the software-less circuit does the circuit you describe there go in place for just the "brain" and then you still need to connect it to the relay switch?

[BIGHAIRYDUDE]

how much did this cost you and could you use it with high voltage like in a normal light switch in the wall

[EngineeringShock]

Hey
I buy and sell directly from China in bulk, so not very much. The little yellow component on the back is a relay that is capable of turning your AC lights on and off =)

Thanks for the question.
Pat

[BIGHAIRYDUDE]

but what if i was just to do it buying one piece at a time about how much?

[EngineeringShock]

Dunno
$20? I have a hobby store, so I have tons of components lying around.

[leandro0012]

First of all, thanks for sharing this nice instructable. Secondly, Can I use another PIC microchip? Sorry for my ignorance.
I'm asking this because in Argentina it's very difficult to get the PIC10F222 Micro controller. Do you know any china store with this microchip and worldwide shipping?

Thanks a lot.

[EngineeringShock]

I could likely send you one or two. The computer with the software is currently packed away, so they would not come programmed. Other chips would do, but you would have to edit the code for compatibility.
PIS10F220 is almost identical.

Thanks
Pat