MQ-2 Smoke Hydrogen Propane Gas Sensor ModuleFeatures: Sensitive for LPG, propane, hydrogen Output voltage boosts along with the concentration of the measured gases increases Fast response and recovery Features boost circuit Adjustable sensitivity Signal output indicator Pin Configuration: Pin No: Pin Name: Description For Module 1 Vcc This pin powers the module, typically the operating voltage is +5V 2 Ground Used to connect the module to system ground 3 Digital Out You can also use this sensor

it also has internal resistance and capacity checker along with a brushed motor driver

The RX and TX LEDs on the board will flash when data is being transmit via the FTDI chip and USB connection to the computer (but not for serial communication on pins 0 and 1)

it doesn’t get much more basic than wrapping jumper wires

2V V-PP to 11

Pin 3 (RD)

Five different step resolutions: full-step

portable speakers

12V standby power electronic products

one 40-pin female to female jumper wires

Set start the humidity:  Press the UP button display start the humidity

The best remote control distance can be achieved 2Avoid installation in rain

19x terminal (screwdriver) 4mm