Soldering The Microcontroller - Progress Direct Systems Volt Tattler 2 Owner's Manual

Soldering the Microcontroller

When you insert the chip into the PC board make sure that the pin-1 end is at the proper end of the
board, away from the piezoelectric speaker. The pin-1 end of the chip will have a small notch in the
chip.
Above is a picture of the Pin 1 end of a microcontroller.