Assembling the ESP-wifi-i2c-1.0 board

• The 8 pin female headers go on each side of the chip.
• The grove port is best soldered on the bottom right side. (Up is when the boot and reset buttons are up, and when you can read all text.)
• The 4 pin female header goes bottom right, so it connects to the distance sensor breakout board

Here's a full assembly tutorial on YouTube