It helps a lot.The idea it to have the sound go thru the running fan to study how disformed it souds like while the beat frequence is modified and the fan speed is as well. You can buy an original or a clone, It’s easy to find on ebay.I don’t know what you want to do when you said control a small speaker, I don’t know what’s your project about.But with the Bluetooth module, a smartphone and an Arduino You can control the fan and the speaker for sure!And the Arduino Can run with a 9V battery!If you have more questions just let me know or just talk about your project!?. Thanks for your support, I’m really glad you enjoyed it!You can buy any Arduino to control the fan and the speaker, I would recommend you to buy the Arduino Uno or the Arduino Duemilanove. With just my ipad or with my linux computer with a virtual machineI didn’t found any similar app for my iphone/ipad that’s why I used my androidActually I don’t know any free app that does the same as Blueterm. Hi Thomson!You can use the Arduino uno or the Arduino Leonardo they both are capable to do that project, you can read this post for more information and see the advantages between the 2 boardsBut in conclusion for that project it doesn’t make much difference they’ll both work just fine ?I didn’t made the app I’m running on my smartphone And I don’t know much about iOS programming, I was thinking in making one but actually I’ll only be able to do that If I’ve buy a Mac or something otherwise would be really hard to create one app. Nice ? btw usually the HC-05 requires a pass and its ‘1234’.you can use an iphone you just need to find a similar appIf you’re familiar with the Arduino IDE, what the blueterm app actually does it connects your smartphone to your arduino via Bluetooth, and it does a serial communication between the devices. I can write the code for you Its pretty quick.

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