What are these parts for?
Hello,
Can you tell me what are these 2 pieces for?

I guess the No. 1 is for the ultrasonic sensor? to solder on MyBoard?
Sensor Side =>NyBoard Side
GND => GND
Echo => D10
Trigger => D9
VCC => D8
For No. 2 I do not know?
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@CHAZ BRGR number 1 is the 4-pin to connect the ultrasound sensor. As answered by eric in the post.