The percent composition of formaldehyde, {eq}CH_2O {/eq}, is: a. 40% carbon, 3% hydrogen, 57% oxygen. b. 40% carbon, 3% hydrogen, 53% oxygen. c. 40% carbon, 7% hydrogen, 53% oxygen. d.

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In this video, I demonstrated how to connect or interface MQ2 gas sensor to Arduino and how to use gas sensors with Arduino.MQ2 is a gas sensor it is able to...

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Jan 12, 2018The design of the PIR Motion Sensor using Arduino is very simple. The PIR Sensor Module has three pins: VCC, Digital Out and GND. Connect VCC and GND to +5V and GND respectively. Then connect the Digital Out Pin of the PIR sensor to the digital I/O pin 8 of Arduino. As we need to indicate the detection of motion by the sensor, connect a buzzer to Pin 11 of the Arduino. NOTE: Buzzer is connected directly to Arduino. …

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