The NodeMCU board is essentially a breakout/development board for the ESP12E module by AI-thinker. To resolve some of the issues associated with these modules, several breakout and development boards based on these modules were made such as the Wemos D1 (which worked like the Arduino Uno) and Wemos Mini boards, but none of them quite achieved the same level of popularity as the NodeMCU. Several other versions of the modules were made but they all had similar constraints. The chips had little (written in Chinese) or no documentation and this made them even more difficult to use. Users, however, quickly discovered several constraints from the power requirements to the breadboard unfriendliness of the chip. So when the first version of the ESP8266 module (ESP-01) came to market, it was an absolute delight as the low price and quality drove the popularity of the chip. ![]() All those modules were either too expensive or quite complex to use. ![]() The Arduino came at a time when the IoT revolution was starting out and it gave makers the opportunity to be part of that revolution by building simple connected devices, combining the Arduino and several different kinds of WiFi and Ethernet modules/shields.
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