#04 miscellaneous
A5 Mode
The assignment of the Arduino pin A5 is configurable. It
can be used to switch the power of the AUX connector or
as an additional sensor input.
Place a jumper to enable the AUX power out, leave it open
for using the sensor 2.
AUX
This two pins are an additional switchable power outlet. It
switches directly the input power and can handle a
maximum of 1A.
When using it ensure that the A5 mode jumper is closed.
Serial
The serial rx/tx pins from the Arduino have its own
connector here. The RX/TX pins have 3.3v logic levels, but it
is no problem to use them with 5v as well if the
counterpart is flexible as well. Additionally there are both
voltage levels and ground available as well.
Sensor Input
Though the analog Arduino pins A4 and A5 are not used in
standard GRBL firmware, the shield is ready for future
developments and provides own connectors for them. In
combination with a +5v and ground pin for each, it is easy
to plug in common sensors.
When using the sensor 2 ensure that the A5 mode jumper
is open.
TEC Signal
Another thing for future development. Currently not
supported.
TEC Signal
Serial
AUX
A5 Mode
Sensor Input
+5v
ground
signal
sense
+5v
ground
Sensor 1
Sensor 2
-
+
ground
+5v
+3.3v
rx
tx
