Today i am going to share a small tips to all of you who reading this article .
When you have purchased feasycom FSC-BT802 bluetooth module dev board .
When the bluetooth module communicate with MCU .
And you plan send AT Command through your MCU not module.
After you have done some test ,you may found that ：
Same AT Command
1.Through usb ,send AT Command ,it works
2.Through uart ,send AT Command ,it does not work.
What you should do is remove the 2pcs resistance as below image which marked in red.
Just remove it ,then it works .
For more details ,feel free to Contact Feasycom .