Gas Sensors Detection

[ameliaf03]

I'm very new to electronics and i'm very confused on how LM 399 and the gas detection with green, yellow, and red light works if i have the supply voltage of 5V, please help and if you can explain in detail because im very slow and i really need your help.... thank you so much beforehand

[pcprogrammer]

What might help you is to first start with drawing a proper schematic instead of the wiring diagram you posted. You can, for instance, use https://easyeda.com/editor to draw it.

Use the correct symbol for the different components. Like for the LM339 which houses four comparators use the triangle symbol shown in the datasheet. https://www.ti.com/lit/ds/symlink/lm339-n.pdf

If you still don't understand how it works after doing that come back here and post the schematic in this thread.

[ameliaf03]

thank youuu, i will try your suggestion first