Parallax P2 Edge Module - User Guide

external pull-up resistors by default, and are completely flexible and free for the user to use as

required.

In user code those pins could be driven high or low, or have I/O pin pull-ups activated, to control

the LEDs without the high-impedance behaviour.

If the LEDs are not required, the P2 Edge Module dip-switch marked “LED” could be switched

“OFF” to disable LED power.

8. LEDs P56 and P57

These two LEDs are mounted so that they are visible from both sides of the P2 Edge Module

PCB. They are connected via an LED Buffer to pins P56 and P57. The buffer isolates the LEDs so

they will not influence the I/O signals.

If the LEDs are not required, the P2 Edge Module dip-switch marked “LED” could be switched

“OFF” to disable LED power.

9. Mounting Holes

The two plated mounting holes are attached to the ground plane. See the PCB Dimensions

section for mounting hole spacing.

10. Orientation Hole

The single unplated orientation hole could be used by a customer application to fix the module

in-place or ensure correct orientation. See the PCB Dimensions section for the hole position and

dimensions.

11. Edge connector

The 0.05” (1.27 mm) pitch 8- way edge connector extends on both sides of the module, with 40

connections on each side. Refer to Edge Connector Pin Assignment for full details.

Suitable connectors are available from the Parallax webshop:

● Card Edge Socket, Through Hole, Right Angle (#450-00308)

● Card Edge Socket, Straight, SMT (#450-00309)

● Card Edge Socket, Straight, Through Hole (#450-00310)