Hardware Reference
In-Depth Information
FIGURE 6.23
Open-source polymer welding system detail.
In addition to the printed parts, the system needs mechanical and electrical parts shown in
noted here that, like most open-source designs, this is a living, evolving research tool and any
used the electronic circuit schematic shown in
Figure 6.24
.
The electronics build and commu-
nication setup has 10 easy steps:
1.
The jumper near to the GND pin must be removed
; otherwise the Arduino will be damaged! (See
details in
Figure 6.25
).
2. Connect the 12 V cable to M+ pin and ground to GND pin on the motor shield as seen in
3. Connect the endstops as shown in
Figure 6.27
.
4. Fix the endstops such that the laser carriage reaches the lower left corner of the mechanism
as shown in
Figure 6.28
.
5. For the following steps, use the chip and wiring pins outline in
Figures 6.29
-
6.31
.
If using
Adafruit stepper motors, connect the wires following the order: from M1 to M2, brown,
green, skip Gnd pin, yellow and red. From M4 to M3, brown, green, skip Gnd pin, yellow
and red.
6. Connect MAX3323E pin 1 to a 1 μF capacitor, a 1 μF capacitor between 1 and 3, another
between 4 and 5, and the last 1 μF capacitor to pin 6, as shown in the figure. Pins 7 and 8 go
to the DB9 cable pins 3 and 4, pins 11, 12, 13, 14 and 16 to 5 V and pin 15 to ground. Pin 9
to Arduino pin 19 and pin 10 to Arduino pin 18. Ground the capacitors as shown, if using
polarized capacitors, make sure to connect the negative sides to ground for the capacitors in
MAX3323E pins 1 and 6, pin 3 for the capacitor between 1 and 3 and pin 5 for the capacitor
between 4 and 5.
7. Connect DB9's pins 1 to ground, pins 2 and 5 to pin 9, pin 3 to MAX3323 pin 7, pin 4 to
MAX3323 pin 8, and pin 7 to pin 8.
8. Upload the firmware to Arduino using Arduino software.
40
9. Connect the DB9 cable to LaserSource 4320 RS232 input.
10. For
firmware,
open-source
software,
and
a
template
for
this
tool
go
here:
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