Nov 12, 2020 #1 L loloak Newbie Joined Oct 16, 2019 Messages 4 Helped 0 Reputation 0 Reaction score 0 Trophy points 1 Activity points 44 Hi, I want to build an alarm circuit for gas leakage using mq-6 sensor. below the circuit i want to try, does it work correctly or need any modification?
Hi, I want to build an alarm circuit for gas leakage using mq-6 sensor. below the circuit i want to try, does it work correctly or need any modification?
Nov 13, 2020 #2 barry Advanced Member level 7 Joined Mar 31, 2005 Messages 6,333 Helped 1,194 Reputation 2,400 Reaction score 1,389 Trophy points 1,393 Location California, USA Activity points 34,481 Assuming your R1 value is suitable, I would only suggest adding some hysteresis to the comparator.
Nov 13, 2020 #3 KlausST Advanced Member level 7 Joined Apr 17, 2014 Messages 25,173 Helped 4,868 Reputation 9,757 Reaction score 5,541 Trophy points 1,393 Activity points 168,429 Hi, I agree. A noise canceling capacitor across R1 should be useful, too. Mind to use a bulk capacitor and a fast ceramics capacitor for 5V supply. Klaus
Hi, I agree. A noise canceling capacitor across R1 should be useful, too. Mind to use a bulk capacitor and a fast ceramics capacitor for 5V supply. Klaus
Nov 17, 2020 #4 D dr pepper Advanced Member level 1 Joined Mar 15, 2010 Messages 420 Helped 34 Reputation 68 Reaction score 40 Trophy points 1,308 Location lancs Activity points 4,128 I made something like this back in the spring. I used an Mq2 module, which has everything on the board. Looks like your circuit will work, without hysteresis the buzzer might slowly start to sound rather than be a definite on / off.
I made something like this back in the spring. I used an Mq2 module, which has everything on the board. Looks like your circuit will work, without hysteresis the buzzer might slowly start to sound rather than be a definite on / off.