Edited by KaungWai at 2018-4-24 13:06
Now, It's working fine. The problem is power supply. I used a 5V, 2A power bank and then tried 5V,1A. It behaves as I said above. When I use a samsaung phone charger 5V,1.5A, it working normally. But I'm not sure grren led is not working or still no need to blink. Do you know when the green led blink?