I tried on connecting everything according to this diagram except for the soil moisture sensor and I heard a small pop. I studied it when I was on college but forgot any subsequent knowledge related to this. I need help with this. If possible, could you also tell me the appropriate connection for this?
The SG90 servo you seem to have draws 10–15 mA at idle, 100–250 mA during operation, and up to 650 mA at stall ➜ ideally you would power the servo directly from the power source. The UNO should not be seen as a general purpose power supply.
Hi, @nyewbyte
Welcome to the forum.
Did they teach you to draw schematics?
Can you post some images of your project?
So we can see your component layout.
From where and can you smell any burning?
Thanks.. Tom.. 
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