Pololu Dual VNH5019 User Manual
Page 23
In all cases, the top through-hole of the pair connects to the Arduino pin and the bottom through-hole connects to the
motor driver pin. To change one of the default mappings, simply use a knife to cut the trace between the appropriate
pair of holes on the underside of the PCB (there is no connection to cut on the topside of the PCB) and run a wire
from a different Arduino pin to the bottom hole of the pair to create a new connection. You can later use
to restore the default pin mapping if you populate the severed hole pairs with
2×1 pieces of the included 0.1″ male header strip.
6.b. Accessing ENA/DIAGA and ENB/DIAGB Pins Separately
The VNH5019 motor drivers have separate enable/diagnostic pins for the A and B half bridges, but the shield
combines these lines into a single enable/diagnostic pin for each motor driver in order to decrease the number of I/O
lines required to monitor motor faults. This combined line is sufficient for most applications, but you can modify the
board to get independent access to MxENA/DIAGA and MxENB/DIAGB if you want the additional information.
There are two pairs of 0.1″-spaced holes on the shield labeled “M1EN A=B” and “M2EN A=B”. These pairs are
connected on the underside of the PCB by a thin trace, with the hole labeled “A” connecting to the ENA/DIAGA pin
of the corresponding motor driver and the hole labeled “B” connecting to the ENB/DIAGB pin of the motor driver:
Cuttable traces on the dual VNH5019 motor
driver shield for separately accessing ENA/DIAGA
and ENB/DIAGB.
The following diagram shows the relevant section of the board schematic:
Schematic diagram of the enable/diagnostic
circuit on the Pololu dual VNH5019 motor driver
shield.
To separately access both ENA/DIAGA and ENB/DIAGB, you can use a knife to cut the trace between the through-
hole pair and then run a wire to the right (B) pin. Note that once the connection between the two pins is severed,
Pololu Dual VNH5019 Motor Driver Shield User’s Guide
© 2001–2014 Pololu Corporation
6. Customizing the Shield
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