USITT 2017 Tech Expo Guide - 47

Tech EXPO 2017

Figure 5 - Layout of enclosure internals

tors soldered to it, these will need to be removed so
that everything will fit within the enclosure. Also,
the DMX shield is set up as a master from the factory, so in order to use it you have to change some
connections. On the top right of the Tinkerkit DMX
shield there are some solder pads labeled "DE-EN"
and "RE-EN." You will need to de-solder the jumper
from the "DE" side and run a short jumper from the
center solder pad to the "RE" side of the solder pad
below (Figure 4). Next, locate the solder pads labeled
"TX-SEL" and "RX-SEL." Move these jumpers from
the left set of pads to the right set of pads (Figure 4).
Once these changes are made, the shield is ready to be
used as a receiver.
Next, button everything up and mount it all in
the enclosure. Use stand offs to mount the Arduino
so that it does not short out on the metal case. Use
either M3-0.5 or UNC 4-40 stand offs; do not drill the
mounting holes to accept a larger diameter fastener.
Continue mounting the remaining hardware: LCD,
rotary encoder, power supply, fan, and five-pin DMX
connectors. Refer to Figure 5 for layout and mounting orientation.
I constructed the paddle out of 1/4" lauan, but
you could substitute thin gauge aluminum if desired.
The shape and size of this depends on the size and
angle of the projector lens. Try to build this close to

Figure 6 - Back of Dowser unit

the required size, don't go over large here. Fasten the
servo horn that came with your servo to the paddle
and paint.  I found that the servo had to work unnecessarily hard to hold the paddle at 90 degrees. To
help reduce the force required from the servo I added
two pieces of steel flat bar beyond the pivot point to
help counterbalance the weight.  Once everything is
mounted in place, plug it in and test functionality.
You should be able to address the unit using the rotary encoder (Figure 6) and control the rotation of the
servo from the light board.

MATERIALS:
ITEM

PRICE

SOURCE

Hitec HS-645MG Servo

$26.99

Amazon

Arduino Uno

$9.99

Amazon

Tinkerkit DMX Shield

$8.15

Amazon

12 VDC 2A Power supply

$5.94

Amazon

16x2 LCD with I2C Module

$7.99

Amazon

BUD Industries CU347Aluminum Econobox

$23.00

Amazon

Rotary Encoder

$1.89

Amazon

Biennial Theatre Technology Exhibit 2017

47



Table of Contents for the Digital Edition of USITT 2017 Tech Expo Guide

Contents
USITT 2017 Tech Expo Guide - Cover1
USITT 2017 Tech Expo Guide - Cover2
USITT 2017 Tech Expo Guide - Contents
USITT 2017 Tech Expo Guide - 4
USITT 2017 Tech Expo Guide - 5
USITT 2017 Tech Expo Guide - 6
USITT 2017 Tech Expo Guide - 7
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USITT 2017 Tech Expo Guide - 49
USITT 2017 Tech Expo Guide - 50
USITT 2017 Tech Expo Guide - 51
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USITT 2017 Tech Expo Guide - 60
USITT 2017 Tech Expo Guide - Cover3
USITT 2017 Tech Expo Guide - Cover4
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https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966Oct
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966May
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966Feb
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965Dec
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965Oct
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965May
https://www.nxtbookmedia.com