Gravity: Analog Alcohol Sensor (MQ3) Category_Robot Kits/BEAM 5V in and 4A out

5V in and 4A out where the current is just under the limit and the regulator might not shut off before damage occurs

use any 3ohm or greater impedance speakers

com/tutorials/sunny-buddy-solar-charger-v13-hookup-guide-)

The IoT Power Relay is designed to allow you to *safely* control an outlet device that operates at 3--48VDC or 12--120VAC

This is followed by a repeated start and the module address again with the read/write bit high (0XB1 in this example)

Gravity: Analog Alcohol Sensor (MQ3) Category_Robot Kits/BEAM 5V in and 4A outThis is an Arduino Alcohol sensor. It uses a MQ3 probe which can be used in a Breathalyser. It has a high sensitivity to alcohol and less sensitivity to Petrol. The sensitivity is able to be adjusted by the potentiometer. The output is proportional to the density of gas. You can use analog reading to read the data from this sensor. To ease the difficulty of using this sensor, a Gravity Interface is adapted to allow plug&play. The Arduino IO expansion