LITERATURE REVIEW (FYP 1)

JOURNAL 2

WeMos D1 mini

At the end of 2015 the hottest alternative seems to be the WeMos D1 mini. It has roughly the same width as a V2 NodeMCU devkit but at 34.2mm it is nearly a third shorter. It runs an ESP-8266EX MCU and provides 4MB flash. Its nine GPIO pins make the D1 mini suitable for a large IoT target audience. It supports both Arduino and NodeMCU. WeMos also sells a number of shields of equal size which allows to build nicely stackable units.

The only downside for many may be that you have to solder the pins yourself. Each D1 mini comes with a pair of long and short female pins and a pair of normal pins. Some reports on the Internet claim that it can be a bit difficult to get proper drivers for the CH34x USB to serial chip on the D1 mini. That’s the same chip used by some of the cheap Arduino clones. Also, it’s obviously got a few pins less than the NodeMCU boards, check the pin map. On the other hand it’s also got a 5V out just like the LoLin V3.

Credit to : Reuban, S. (2014). Desing and Implementation of A Microcontroller Based Automatic Door NAd Visitor Counter.