Theory behind this project
Another weekend project that I’ve been working on is Wake-up light. Lately I’ve been doing more research on sleep phases and how to “hack” your brain to wake-up more refreshed and adjust your sleep cycle. There are many studies out there explaining this and providing scientific evidence, so if this is something you are interested in, I encourage you to go and get more detailed information on this subject. However I won’t go into too much detail, I’ll just try to give very simple explanation: When you sleep, you are either in REM or deep sleep (NREM) phase. When you wake up in REM phase you feel fresh, relaxed and full of energy. When you are woken up during the deep sleep phase, you feel like you’ve just been hit by a bus, and you take long time to actually wake up. Continue reading “DIY Wake-up Light – Wake-up easily and well rested”
USB Power supply Active Load Tester or short PAL Tester is unit designed for testing the quality of the power supplies.
Idea was to create low-cost, precise device for simultaneous measurement of Voltage and Current drawn from the device under test. This is one of my weekend projects that I have decided to release to the public. All source files can be found on projects GitHub page.
- Open Source and Open Hardware
- Modular design, easy to understand and change/adapt to your needs
- Uses widely available and off-the shelf components
- Components Bill of Material is below $10
- Integrated USB-to-Serial converter for easier interface with the device
- API for communicating with PC
- Recording Voltage vs Amps data and graphing the results
- Easy to use
Continue reading “USB Power supply Active Load Tester”
This is the Light Show made from LEDs and few discrete components like resistors and transistors. It transforms audio signal into light signal with LEDs. We have used two types of LEDs, white and blue, each one for different sound channel (from stereo audio output).
Our prototype was first built on solder-less breadboard. Link to YouTube video
Components that are required for this build:
– 5 VDC regulated power supply (You can use your USB cabel)
– 2 NPN transistors (any transistors will work, we have used BC547 for our prototype) (for one channel)
– 1x300K resistor and 1x33K resistor (for one channel)
Continue reading “Simple Stereo LED Light Show”