This video is a shockwave flash video ( .swf file type).
To view this video you need to have the shockwave Flash Video plugin installed in your browser.
You can find that plugin here: http://www.macromedia.com/go/getflashplayer
I have tested viewing these in Chrome (40.0.2214.111), Firefox (35.0.1) and IE9. So if it does not work try a different browser.
INA219: How to use the INA210 for maximum accuracy in current and power measurements
The Arduino shiftIn() function can simply can accept data from paralle to serial converter chips. Find out how it works and how fast it operates.
How to easily make a logic level converter e.g. between 3V and 5V.
The Arduino shiftOut() function can simply control many different serial interfaced chips. Find out how it works and how fast it operates.
A tutorial on using the ADS1115 precision 16 bit ADC for low power use.
Learn how to use the TP4056 properly. There's a right, and a wrong way, to use it to safely charge Lithium Ion batteries.