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1) Rotary Voltage Output Selector
Select an output voltage (VOUT) using a small screwdriver to rotate the arrow. The markings on
the rotary selector and the voltage are shown on the back of the PowerPal:
0 = 3.3V, 1 = 5V, 2 = 6V, 3 = 7.5V
While rota ng the voltage selector between op ons, the output voltage will be limited to about
1.8V and the VOUT LED will switch off to signal that the voltage selec on is not valid.
Take care when changing voltages! If your project expects 3.3V, but you select
7.5V even briefly, it may cause significant damage!
Always unplug the external power supply while changing voltage. We strongly suggest
unplugging the PowerPal from the breadboard and testing the VOUT setting with a
multimeter before connecting the PowerPal to your project, especially if you have any doubts
about the module or your power supply.
2) VIN Access Header
The VIN Header is a 0.1" pitch 3-pin header. To provide some polarity protec on for the user,
the two outer pins are nega ve, and the center pin is posi ve.
The 3-pin VIN header is connected directly to the DC Jack, and so care should be taken not to
supply power into the PowerPal through both the DC Jack and the 3-pin VIN header at the same
me.
Located between the DC Jack and 3-pin VIN header are two addi onal unpopulated + VIN
through-hole pads. These do not have any headers installed, and are intended for advanced
users who might want to install alterna ve connectors here. If you not need these, then please
ignore them!
3) VOUT ON LED
The green VOUT ON LED will light up when the rotary voltage output selector is set to one of
the four posi ons, and VOUT is ac ve. The brightness will vary depending on the output voltage
selected.
If the PowerPal detects an over-current condi on, the VOUT ON LED will start blinking rapidly to
indicate a fault. If this occurs, disconnect power immediately and inves gate.
If the VOUT ON/OFF pads are shorted together, the VOUT ON LED will go off, as the output is
disabled.
Copyright © Parallax Inc.
PowerPal Module (#32133)
V1.0 11/20/2018 Page 3 of 6
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