Do you have a pile of AA rechargeable batteries in your drawer? Some are old, some are new, but which sets would you bring with your camera on your next trip, and which ones are past their useful life? I like using rechargeable batteries, but I’m certain that some of them are not living up to the stated capacity on the label. So how good are those batteries? Simple battery testers measure the voltage, but that’s not what we need – we want to find the overall capacity of the battery. How long will a battery last from the time it’s fully charged to the time that the “low battery” indicator comes on your device? You can see this in action in a video in the last step of this instructable.

Source: Rechargeable Battery Capacity Tester

BUILDING BT RECEIVERTO BUILD BT RECEIVER YOU WILL NEED:– An Arduino Board like that: Arduino Pro Mini 328 – 3.3V/8MHz– A USB Host Shield from Oleg Mazurov’s Circuitathome.com site– An compatible bluetooth module like that: Bluetooth SMD Module – RN-42for Bluetooth Module HC-06 check out eBay– Pololu 5V Step-Up Voltage Regulator NCP1402

Source: Building BT Receiver | DslrSystems

Source: Service Mode for C-Series – SamyGO | Evernote Web

Source: SamyGO

Thunderbird directory setupDavMail Directory support is now available to access Exchange address book through LDAP.

Source: DavMail POP/IMAP/SMTP/Caldav/Carddav/LDAP Exchange Gateway – Thunderbird directory setup

Source: EmerytHacks: Connecting an iPad retina LCD to a PC

Arduino and Netduino are kinda of like small computers that have allowed us to do marvelous things, like controlling our environment and more they are not really that expensive Arduino mega 2560 is…

Source: Arduino vs Netduino : the more things change, more they remain same. | ramblings of a mad man

Source: Netduino :: home | Evernote Web

Source: What is the difference betweet Netduino and .NET Gadgeteer? – Stack Overflow

Microsoft .NET Gadgeteer is an open-source toolkit for building small electronic devices using the .NET Micro Framework. It combines the advantages of object-oriented programming, solderless assembly of electronics, and support for customizable physical design.

Source: Gadgeteer | .NET Micro Framework

The angular diameter or apparent size is an angular measurement describing how large a sphere or circle appears from a given point of view. In the vision sciences it is called the visual angle and in optics it is the angular aperture (of a lens). The angular diameter can alternatively be thought of as the angle through which an eye or camera must rotate to look from one side of an apparent circle to the opposite side. Angular radius equals half the angular diameter.

Source: Angular diameter – Wikipedia

​With 5G, carriers hope  to deliver data to smartphone users at speeds 10 times as fast as on  today’s 4G networks, and with only 1 millisecond of delay.

Both Verizon and AT&T say their 2017 fixed wireless networks will rely on millimeter waves, which are arguably the hottest new 5G technology. Millimeter waves are officially defined as waves transmitted at frequencies between 30 and 300 gigahertz, and they are between 1 and 10 millimeters in length.