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MiniLab
Side panel 1
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Totem by UAB Aldrea
ver 1.0!
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Min iL ab Side Panel 2
Overview
This is a getting start ed guide for the first expansion board for the Totem M iniLab syst em.
In this document we’ll go over all of the available modules in the board, together with
explanati ons on their interface with the MiniLab as well as usage examples.
Side panels are meant to bring easy access to commonly used components that are
difficult to wire on breadboards due to their dimensions, or r equire additional equipment
to operate them. These panels give a plug and play interface that lets users to concentr ate
on experiments or learning, rather than spending time solvi ng issues on how to interface
with the part.
This document is divided into sections where each
separate module is described. I n the side panel 1 these
modules are available for use:
• Latched swi tches with LED i n dication — can be
wired to use normally-on or normally-off position.
Includes an LED for push indication.
• Potentiometer s— group of potentiometers t hat can
also be used as a simple voltage divider.
• En coder with push sw itch — a two line encoder
that gives out pulses when rotated. Also includes a
pushable button.
• Push switches — simple buttons for signal output.
• RGB L ED — full color LED that can be used to learn
about PWM.
• Relay m odule — includes an integrated driver , can be
used with currents of up to 10 A.
• 3.5 m m jack adapter — pr ovides an easy access to a
headphone jack connectors.
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Modules
In the board only the supply power is shared bet ween modules. Otherwise they’re fully
isolated from one another, and can be used independently. Logic level for digital signals
have a jumper which selects the boards to work either at 3.3 or 5 V logic level. It’s
important for the side panel to have the same logic level as the controller board (e.g.,
TotemDuino), for best results.
Switches
Push-button switches have two channels — one is used for indicating the current state
with an LED, and the other can be employed for own use:
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Fig. 1 Switches module schematic
Pins 1 and 2 (together with 5 and 6) ar e normally connected when the switch is in the “off”
position. When button is pushed in, pins 2 and 3 (together with 5 and 4) become
connected.
On the side panel 1 there are 3 identical switches.
Potentiometers
Using jumpers JP3 and JP4 you can select the range of the potenti ometer to be between
supply voltage. In any other case jumpers may be removed, and side pins for connector H5
should be used.
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Fig. 2 Potentiometers module schematic
Similar l y as with the swit ches, there are 3
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identical potentiometers in side panel 1 as well.
Encoder
This device captures control knob rotation and outputs two phase-locked signals on it’s
output at connector H 7, pins 2 and 3. As these signals are always delayed by 90 degrees
fr om each other, its possible to extract direction information fr om these signals, together
with rotation speed from the frequency of it.
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Fig. 3 Encoder module schematic
Push-button is also included in the encoder, and connected to the H7 connector pin 1.
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Fig. 4 Encoder working principles
Buttons
These are simple non-locked buttons that connect the signals from connector H8 to
ground. Because of their size buttons are sometimes difficult to mount on breadboard, so
si de panel 1 gives a convenient access to them, where only a single wire can be used to wire
a button. You get 3 buttons on a side panel:
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Fig. 5 Buttons module schematic
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Fig. 6 Buttons location in side panel
RGB LED
This i s a three color LED in one package. Each LED can be controlled independently from
others from pin H 9. This is a great module to experiment with PWM signals, and to create
different colours by varying intensities of separate LEDs.
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Fig. 7 RGB LED module schematic
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Fig. 8 RGB LED channels
Relay module
This module has a single relay, driven by a tr ansistor. Using H11 connector as an input,
you can control the relay with logic level signals. Relay activation state i s show with LED4,
and its output is connected to B1 terminals.
Used relay can control loads with up to 10 A.
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Fig. 9 Relay module schematic
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Fig. 10 relay working principle
3.5mm adapter
Purpose of this module is to give an easy access to a difficult to mount on a breadboard
part. All signals from the jack are connected to H10 connector:
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Fig. 11 3.5 mm adapter module schematic
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Fig. 12 3.5 mm audio jack breakout
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Assembly
This section guides through the st eps for assembling your side panel.
Side panel 1 with all through hole part s, almost all of which can only be mounted one-way
because of their pin arrangement. Special car e must be taken when mounting LED’s and
transistors, as they can only work one way. Parts have special indentations that ar e
reflected on the board and must be matched.
As usual, we recommend starting your assembly fr om the smallest components such as
resistors, and working your way up with larger ones. That way when you fli p the board to
solder the contacts, they will not fall out from their place. Use the following guide for
assembly:
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Mounting
We suggest using the following guide for side panel mounting to the MiniLab workbench:
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In this case, the sub-assembly can be easily taken off by sliding the pins fr om the sockets.
If a more permanent assembly is needed, nuts and screws can be used to fix the sidepanel
in place.
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Schematic
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