Building an IoT Node for less than 15 $: NodeMCU & ESP8266 eBook –

Espressifs ESP is among the most integrated WiFi chips in the industry it integrates the antenna switches, RF balun, power amplifier, low noise receive amplifier, filters, power management modules, it requires minimal external circuitry, and the entire solution, including front end module, is designed to occupy minimal PCB areaThe ESP also integrates an enhanced version of Tensilicas L Diamond seriesbit processor, with on chip SRAM, besides the Wi Fi functionalitiesThe ESP is the base for several ESP modules some of them will be introduced hereThe ESP is RoHS conform and has all required certificates, as FCC CE Therefore, no restrictions for its use in applications will be expectedNodeMCU is an open source IoT platform It uses the Lua scripting language It is based on the eLua project, and built on the ESP SDKIt includes firmware which runs on the ESP and hardware which is based on the ESPmoduleA few lines of Lua are sufficant to build a web server or client, a MQTT publisher or subcriber or connecting peripherals This kind of applications are in focus here