Here is a biofeedback kit that uses red/infrared light sensing to measures changes in blood-oxygen level in your brain in real-time. HEGduino shows you in real time how your brain blood-oxygen levels respond to your thoughts and actions. As you focus, breath, and relax, you can watch the response on your screen.
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The HEG can be controlled via WiFi, Bluetooth, and USB. It has a HTML interface and free game that you can play on your HTML5 compatible device. The developers are working on iOS/Android devices. The platform is open source.
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