EEssential

LoRa is a low-power and long distance wireless technology.  I have a set of Semetch SX1272 boards.  We'll try to use them to communicate...

PSoC from Cypress is a unique microcontroller for the flexibility of its peripherals.  The low-cost PSoC 5LP prototyping kit CY8CKIT-059 is ...

The battery can be purchased for less than $2 a piece.   But it is a little skeptical that the capacity is actually 3000mAh.  The weight is ...

"18650 Battery Shield V3" charges a 18650 lithium ion battery and outputs 5V and 3.3V.  It claims 4A on 5V and 1A on 3.3V.  It can...

The most annoying problem with ANENG AN8008 multimeter is the poor accuracy of high current measurements.  Significant error is seen for th...

I wrote about  $4 multimeter  (also see  here ), which is fine for crude measurements.  For $20, we can have a meter with the following enha...

The TS100 soldering iron is an open source hardware by Miniware, which releases the schematics and software.  It has a decent construction; ...