Clap to turn on light

Did you ever see in the movies when someone claps their hands twice and all the lights turn off?? I thought that was the coolest thing ever! Now, with the micro:bit, an enviro:bit, and some NeoPixel lights you can recreate that same effect!Here's what you'll be making:micro:bit #1 is going to be wearing the stylish enviro:bit. micro:bit #2 will be connected to one of the shiny ZIP Halo NeoPixel ring lights. When micro:bit #1 detects a clap, it will send a radio signal to micro:bit #2. micro:bit #2 will turn on/off the lights depending on the information it receives from micro:bit #1. Simples!We’ll go through the code for both micro:bits. You’ll learn how to use the enviro:bit, the radio, and the NeoPixel package on the micro:bit.We put the micro:bit with the ZIP Halo on inside an IKEA Sinnerlig glass lamp, after taking the original bulb and wiring out, and it makes a lovely mood light. We used battery packs to power both the ZIP Halo micro:bit and enviro:bit micro:bit, so the whole thing is wireless, but you could easily use wired power supplies for a more permanent solution.Coding the micro:bit that is wearing the enviro:bitThis first part will set all of the code up on micro:bit #1 with the enviro:bit, sensing the claps and sending commands to micro:bit #2 with the radio to control the lights.Setting up the packageFor ease of use, we'll add the enviro:bit blocks package to your menu:Select AdvancedScroll down and select Add PackageType enviro and then click the search iconSelect the Enviro:Bit packageThis will add the Enviro:Bit menu to your menu.Setting up the radioThe micro:bit has a built-in radio function that lets you send commands from one micro:bit to another, and you can even send different commands to particular micro:bits by assigning them to different groups.Let's set the radio up on micro:bit #1 to let it send commands to micro:bit #2.From the Radio menu, drag out the block radio set group and place it under on startCheck for a double clapLet’s check for a double clap first. If we hear a double clap, we'll send the number 2 to micro:bit #2. The double clap will turn the light off.From Logic, drag out if true then and put it under foreverFrom Enviro:Bit, select Sound, drag out Wait 1000ms for a double clap and drop it onto the trueFor a double clap, let’s send 2 to micro:bit #2

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And also display 2 on the LED matrix on the micro:bit so that we can see better what's happening.From Radio select radio send numberChange 0 to 2From Basic, select show numberChange 0 to 2Check for a single clapIf it’s not a double clap, let’s check for a single clap and send the number 1 to micro:bit #2.Select the blue toggle on the if statement and drag else if under the if statementSelect the blue toggle again to turn it offFrom Enviro:Bit, select Sound, drag out Wait 1000ms for a single clap and drop it onto if elseChange 1000 to 500For a single clap, let’s send 1 to micro:bit #2 and also display 1 on the LED matrix on the micro:bit.From Radio select radio send numberChange 0 to 1From Basic select show numberChange 0 to 1If you find that the clap-sensing by the enviro:bit is too sensitive or not sensitive enough, then you can lower the sensitivity. Under on start, add the block Set clap sensitivity to 10 from the Enviro:Bit menu.You can also add an if statement around the whole lot of code and only check for claps if the sound level is greater than 15. Your complete if statement would be if Get sound > 15.Download the code from here, or from below, to a micro:bit and attach the enviro:bit to it.Coding the lightThis second part of the code is for micro:bit #2, and will receive radio commands from micro:bit #1 and then control the lights accordingly. We'll use the Kitronik ZIP Halo NeoPixel ring light connected to this micro:bit.Select Project and New Project in the MakeCode editor to start a new project.Setting up the NeoPixel packageAdd the neopixel package to MakeCodeSelect AdvancedScroll down and select Add PackageSelect the neopixel packageSetting up the radioLet's set the radio up to allow it to receive commands from micro:bit #1.From the Radio menu, drag out the block radio set group and place it under on startSetting up the lightsWe need a variable that we'll set to control the lights. We'll give it the very clever name of… LightsCreate a variable called LightsSelect VariableSelect Create New VariableType Lights and click OKFrom the Variables menu, drag out Set item to 0 and place it under On startChange item to LightsFrom the Neopixel menu, select the first block Neopixel at pin 0 and drop it onto 0If you're using different NeoPixel lights, change 24 leds

To the number of LEDs that you haveMaking the lights reactHere's the plan:If we receive the number 1, then turn on the lightsIf we receive the number 2, then turn off the lightsTurning the lights on:From Radio, drag out on radio received receivedNumberFrom Logic, drag out if true then and put it under on radio received receivedNumberFrom Logic, drag out 0 = 0 and drop it on top of the trueFrom Variables, drag out receivedNumber and drop it onto the first 0Change the second 0 to 1From Neopixel, drag out item show color redChange item to LightsChange red to blue (or whatever your favourite colour is!)Turning the lights off:Select the blue toggle on the if statement and drag else if under the if statementSelect the blue toggle again to turn it offFrom Logic, drag out 0 = 0 and drop it on top of the true of the else ifFrom Variables, drag out receivedNumber and drop it onto the first 0Change the second 0 to 2From Neopixel drag out item show color redChange item to LightsChange red to blackTada! Simples!It's a good idea to have an off switch, in case the double clap doesn’t work!From Input, drag out on button A pressedFrom Neopixel, drag out item clearFrom Neopixel, drag out item showChange item to Lights in both blocksDownload the code from here, or from below, to a micro:bit and attach the ZIP Halo to it. Kitronik have a nice guide on getting started with the ZIP halo on their site.Plug battery packs into both your micro:bits, remembering to plug the one powering the ZIP Halo into the connector on the Halo itself rather than the one on the micro:bit (it'll provide power to the micro:bit through the Halo).Turn both battery packs on, and turn the switch on the ZIP Halo to the on position also. Try clapping, and your light should turn on! Clap twice and it'll go off again. It can take a little experimentation to get the claps exactly right in terms of loudness and speed.We used a couple of lumps of Blu Tack to attach the battery pack and the ZIP Halo to the base of the IKEA Sinnerlig lamp, and then popped the glass cover back on.

Turn out to be LOW, and it will trigger the 555 IC due to the low voltage (underneath Vcc/3) at Trigger Pin 2, and the LED will turn ON. We have associated the LED to Output PIN 3 of 555 IC through a 220ohm resistor. After some time, LED will be automatically turned OFF. Therein, we are utilizing the 555 timer IC in Monostable Mode. However, the LED will stay turned ON for 1.1*R1*C1 seconds. With this formula, we can see that we can change its ON and OFF time by changing the estimation of Resistor R1 or/and Capacitor C1. We can alter this circuit utilizing Relay to control the Electronic appliances (120/220V AC). Control PIN 5 of 555 Timer IC ought to be associated with Ground through a 0.01uF capacitor.Applications and UsesThe Clap switch is not only used to turn the LED ON and OFF. Yet, it may be utilized in many electric appliances, for example, Tube Light, Fan, Radio, or whatever another essential circuit you need to turn ON by a Sound signal.