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complicated. The Mini components are shown in
Schematic 1. Everything we will need to load our firmware
into the ESP8266 is mounted on the D1 Mini printed
circuit board (PCB). The ESP8266 support components on
the flip side of the WeMos Mini are captured in Photo 2.
USB-to-serial conversion is provided by the CH340G USB-ADVANCED TECHNIQUES FOR DESIGN ENGINEERS
August 2017 55
■ SCREENSHOT 2. The work we performed in Screenshot
1 produces fruit here. We obviously now have support for
our target hardware: the WeMos D1 Mini.
■ SCHEMATIC 1. The ESP8266 is supported by a USB-to-serial IC and a linear power supply. All we need is a USB
connection to a host PC to load code into the ESP8266.
■ PHOTO 2. This is the flip side of the WeMos Mini that
hosts the programming and power supply components.