Black Box for Vehicles with Gas Detector [MQ – 6], Fire Detector [?], Water Level Detector [Cylindrical level detector]

[Bhupinder Singh]

Greetings, People.

We are making an 8051 Microcontroller project that must have three sensors: Gas Sensor [we intend to use MQ – 6 gas sensor], Fire Sensor [no ideas, although LM35 will be good ?] and Water Sensor [3 distinct levels on a cylinder when filled with water that send the results to the 8051].

We've been searching for circuit diagrams and detailed explanations but we're at a loss for what to do. We would appreciate a descriptive circuit diagram that encompasses all the three.

Thank you.

[Ashutosh Bhatt]

i think mq-6 is digital sensor. it gives 1 or 0 output.so it can be directly connected to any of micro controller pin

for fire detctor u can use LM35 along with op-amp as comparator that gives high-low output when temperature rises to certain limit.

as a water level sensor use probes with input to base of transistors

[Bhupinder Singh]

Thank you. 

[Author]

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