Probably you remember we mentioned about Open Source PIC18F USB HID framework. So here it is – a project based on it. And it looks really cool and this is not about circuit and connectivity, but look and idea. Circuit is built around same PIC18F2550 microcontroller with minimal component count. Meter has one RGB LED and couple analogue Hi-Fi UV meters.
The device speaks itself about what it does – microcontroller reads performance counter data from PC via USB, then sends PWM signals to UV meters according to CPU or Network load. RGB LED is used to indicate HDD events. It changes intensity on utilization level and color depending on reading, writing or even both. On PC side there is a Visual Studio 2008 C# host application working to ensure communication with target. Overall this is a fun device that can be built as standalone device or integrated as PC case mod.