EEssential

In 2003, I bought an HP/Compaq Presario 2100 laptop, not the best purchase that I made.  In this days of age, it is just not very useful eve...

Here we try out TI SimpleLink Bluetooth Low Energy (BLE) CC2650MODA+MSP432P401R Launchpad bundle ($35).  MSP432P401R comes with an out-of-bo...

A backup camera with an LCD monitor can be purchased for about 30 USD.  Some camera by itself is sold for less than 4 USD.  The camera can b...

We'll try to run the PX4 firmware on the STM32F4Discovery board.  Some documentation can be found  here .   We'll try to run everyt...

I have an application that requires the fan speed measurement.  We can use some photo detector and a light source between the fan blades as ...

ESP32-PICO-D4 is a SIP (System-In-Package) module; it is measured about 7 x 7 x 1 mm and looks like a regular IC chip in a 40-pin QFN packa...

Expressif comes out with ESP32, a more powerful successor to the popular ESP8266 .  The ESP-WROOM-32 module can be purchased for under $5.  ...