💬 What's all the fuss about?

[mfalkvidd]

To add to the previous answer, in the relay example sketch, ? is used to handle that some relays are active low, some are active high.

From the sketch:

#define RELAY_ON 1  // GPIO value to write to turn on attached relay
#define RELAY_OFF 0 // GPIO value to write to turn off attached relay

[Matias_SAMS]

!!!
Thank you very much community, you are great!

[TalhaYounis]

Hi, I'm working on project of mobile app to measure the CO2, LPG gas , Smog through MQ135 and MQ7 sensors. Kindly help me what should I do??
Give me suggestions....Thank you

[mfalkvidd]

Welcome to the MySensors forum @talhayounis

Th best way to get started with MySensors is to first read the getting started guide. Then you can move on to https://www.mysensors.org/build/gas which has an example sketch to use with MQ135 and MQ7.

The best way is usually to get a gateway and a simple node running, and then expand from that.

[viti]

This post is deleted!

[viti]

This post is deleted!

[Yveaux]

@viti please stop crossposting your questions!

[ZhangCan]

Smaller sensors require lighter lenses (for equivalent angle of view, zoom range, build quality and aperture range).

[IceTalon]

Hi everyone, I’m new here and happy to join the forum. Looking forward to learning and sharing with you all.

[skywatch]

Welcome - I hope you find it inspiring, educational and practical. There is lots to learn and more to achieve.