my gas sensor do not detect smoke, that i connected my circuit. can anyone help
You need to "burn in" the sensor for 48 to 72 hours before it will operate normally. Get it working before adding anything else to your system.
For informed help, please read and follow the directions in the "How to get the best out of this forum" post, linked at the head of every forum category.
Please do not post Fritzing diagrams. They are usually misleading or wrong, and the one you posted is completely useless. Instead, post a carefully labeled, hand drawn wiring diagram.
Never power your motors from the Arduino 5v pin.
How should i power them
If they are 5V servos, get a 5v external power supply similar to this:
5v, 3A
Or
5v, 2A
There needs to be a common between this external supply GND to the Arduino GND
A 4xAA battery pack will work for 1-2 small servos. Don't forget to connect all the grounds.
when i power the circuit, they were moving a bit
Continuing to this, there is a very good chance you will destroy the voltage regulator or other components on the Arduino.
okay
Get the "smoke detector" to work by itself. There are plenty of tutorials for those sensors.
When you understand that part of the project, add other components, one at a time, and make sure they work before moving on.
i should disconnect the servos?
okay, i should start every afresh? even the code
Yes, and yes.
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