Heater connection in the circuit

ostaquet / Arduino-MQ131-driver

Arduino driver for gas sensor MQ131 (Ozone / O3)

MIT License

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Heater connection in the circuit #22

Closed chedao24 closed 4 years ago

chedao24 commented 4 years ago

hi, i am reading this projects it's look awesome, thanks for the research, but i have a doubt about the circuit, in the fritzing model you conect te mq131 module heater to 5V and GND or you connect to 5V and drain of the mosfet?

ostaquet commented 4 years ago

The heater circuit is controlled by the N-channel MOSFET.

The heater is connected directly to the 5V and to the drain of the MOSFET. It is not connected to GND to avoid being on all the time (see also #21 ).