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MQ-9 gas sensor has high sensitity to Carbon Monoxide, Methane and LPG. The sensor could be used to detect different gases contains CO and combustible gases, it is with low cost and suitable for different application. Character * Good sensitivity to CO/Combustible gas * High sensitivity to Methane, Propane and CO * Long life and low cost * Simple drive circuit Application * Domestic gas leakage detector * Industrial gas detector * Portable gas detector
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Arduino Nano is a surface mount breadboard embedded version with integrated USB. It is a smallest, complete, and breadboard friendly. It has everything that Diecimila/Duemilanove has (electrically) with more analog input pins and onboard 5V AREF jumper. Physically, it is missing power jack. The Nano is automatically sense and switch to the higher potential source of power, there is no need for the power select jumper. Nano’s got the breadboard-ability of the Boarduino and the Mini USB with smaller footprint than either, so users have more breadboard space. It’s got a pin layout that works well with the Mini or the Basic Stamp (TX, RX, ATN, GND on one top, power and ground on the other). This new version 3.0 comes with ATMEGA328 which offer more programming and data memory space. It is two layers. That make it easier to hack and more affordable.
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NodeMCU is an open source IoT platform. It includes firmware which runs on the ESP8266 Wi-Fi SoC from Espressif Systems, and hardware which is based on the ESP-12 module. The term "NodeMCU" by default refers to the firmware rather than the development kits. The firmware uses the Lua scripting language. It is based on the eLua project, and built on the Espressif Non-OS SDK for ESP8266. It uses many open source projects, such as lua-cjson, and spiffs.
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Based on TP4056, this includes two pieces of 3.7V lithium battery charger modules, one of which is Micro USB interface, the other is Mini USB interface. It is small size and light weight, especially for a single lithium battery charging. Features: - Input voltage: 4.5V ~ 5.5V - Input Interface: Micro USB port or Mini USB port - Charging method: linear charge - A full charge voltage: 4.2V - Charge Current: 1A (default), modify the onboard resistor to adjust the charging current according to the table below. - Charging accuracy: 1.5% - Charging indicator: Red LED charging, Blue LED full. - Output Reverse: lithium batteries can not be reversed.