Hi guys, i'm doing my final project recently. And i'm using acs712, hc05 (9,10), ds3231(SDA,SCL) and sdcard module to the arduino mega. At first i was trying to check the sketch to the arduino via laptop USB and it was fine and nothing happened. But then, suddenly the arduino shutdown by itself (on and off automatically). I was shocked so i unplug the usb. Then my friend tried to plug 12V adapter to the barrel jack and it back to normal. On the next minute, the arduino burn and smoke came near the barrel jack.
I'm confused right now. Got some hypothesis, 1. that it was may fault not to use 1K+2K resistor to the hc05 2. Is it the current draw got it's limit? because i just read from some forum that SD Card module and The RTC got a huge current draw to the arduino?
I really need yourhelp!