Nokia NWSP Assembly Instructions Manual
Copyright © 2008 Nokia Corporation
NWSP Wrist Unit
Assembly Instructions
Tom Ahola 2008-05-15
1 (12)
Nokia Wrist Attached Sensor Platform
Wrist Unit Assembly Instructions
Tom Ahola 2008-05-15
Copyright © 2008 Nokia Corporation
Contents
1. Electronics assembly....................................................................................................................3
1.1 Bluetooth antenna and keypad ..............................................................................................3
1.2 Charger terminals and battery................................................................................................4
1.3 Putting together the circuit boards..........................................................................................7
1.4 Adding the vibration motor.....................................................................................................9
1.5 Connecting the display.........................................................................................................10
2. Final assembly...........................................................................................................................12
Copyright © 2008 Nokia Corporation
NWSP Wrist Unit
Assembly Instructions
Tom Ahola 2008-05-15
2 (12)
Introduction
This document describes the construction of the wearable wrist unit (WU) version of the Nokia Wrist
Attached Sensor Platform (NWSP). Figure 1 shows the complete assembled unit. The two golden
charger terminals are on the right side and the opening for the power switch is on the top side (these are
not visible in the picture). There is a plastic plug that can be pushed into the power switch opening to
improve dust and water resistance. Note however that the metal gratings on the frontside are neither
dust nor water proof.
Figure 1 NWSP Development Platform Wrist Unit Assembled and Operating
Copyright © 2008 Nokia Corporation
1. ELECTRONICS ASSEMBLY
1.1 Bluetooth antenna and keypad
Start by attaching the Bluetooth antenna and touch keypad to the add-on board as shown
in Figure 2. The wires for the keypad can be a piece of ribbon cable or separate wires. For
the wrist unit the length of the cable/wires can be 20-25mm. Too long wires will be difficult
to fit into the casing. The keypad circuit board will be glued to the cover so there must not
be anything (glue, solder, wires) shooting out to the flat side of the board. The wires don’t
have to be inserted into the holes but can be soldered to the surface only. The wires
should be connected so that each one of the five pads on the keypad board are connected
to each one of the pads on the add-on board in order with the orientation of boards shown
in the figure. The wires should bend to the direction over the integrated circuit on the
keypad PWB as shown in Figure 3. Glueing of the wires is optional but recommended to
make the connections robust enough to allow opening and closing of the device several
times for programming.
NWSP Wrist Unit
Assembly Instructions
Tom Ahola 2008-05-15
3 (12)
Figure 2 Attaching the Bluetooth antenna and touch keypad to the add-on board.
Copyright © 2008 Nokia Corporation
NWSP Wrist Unit
Assembly Instructions
Tom Ahola 2008-05-15
4 (12)
Figure 3 Capacitive touch keypad wires.
1.2 Charger terminals and battery
Attaching the charger terminal wires to the sensor platform circuit board is shown in Figure
4. Carefully observe polarity. The insulation of the negative wire should be stripped so that
it can be soldered to the two terminals of the connector as shown in the figure. Be careful
when soldering to the circuit board that there is insulation around the wire close to the
board. When the wire is bent there is risk of short circuit to the neighbouring soldering
pads on the circuit board. Use insulating (hot) glue if necessary, but make sure the wires
plus glue will not be higher than 1.5mm above the board surface because the second board
will be attached on top of this board. The wires are soldered to the charger terminals as
shown in Figure 5. Carefully observe polarity and take care not to apply too much heat so
that the plastic casing will melt. Glue can optionally be used for insulation and strength.
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