Can i use this sensor on 3.3v microcontroller?
JaneYu 2016-07-27 12:38:02 21 Views13 Replies Can i use this sensor on 3.3v microcontroller?
Hi I read the introduction, it says it can run on 3.3V is this true? Can I use the code in this link to compute for g/dL. https://www.dfrobot.com/blo...
JaneYu Hi I read the introduction, it says it can run on 3.3V is this true? Can I use the code in this link to compute for g/dL. https://www.dfrobot.com/blo...
JaneYu Hi , refer to the datasheet it say the RL value can be adjusted. What does it means? and how can i get the RL value? Isit i can use a multimeter to measure the resistor 103 on the breakout board to get the value?
JaneYu The sensitivity could be adjusted by the potentiometer.
You can set a threshold of the gas value, and when the smoke is high enough, the LED would light up.
JaneYu May i know isit the sensor came with built in resistor ? How do i differentiate the resistor value?
JaneYu Yes, there is a sensing resistance in MQ2
What I mean is you can give external power (5V/GND) for the servos, and since you have the IO expansions shield, you can power the gravity pins with an external power
JaneYu What are the amp requirements of these type of sensors, I have 9 of them hooked up to my Arduino Mega and they pull so much power that my board turns off and my PC wont recognize it. I upgraded to a 5V3A PSU and it is still not enough amps to power everything, it has a bit more power but now it has so little power that if I try to switch a relay it just turns the light on but wont actually switch it.
JaneYu You need to use external power supplies for 9 sensors and Mega board, since there is a chip that limits the current in Mega, and you should connect GNDs of two power supplies
Hi, it is using combustible gas detecting. The analog value shows all PPM of this kind of gas.
JaneYu Hi, It is an adjustable resistor, which you could adjust the zero calibration.
JaneYu 
