Velleman WST8089 User manual

Total solder points: 263
Difficulty level: beginner 1 2 3 4 5 advanced
57mm 7-SEGMENT DIGITAL CLOCK
ILLUSTRATED ASSEMBLY MANUAL H8089IP-1
Large57mmclock & temperaturedisplay
withextra uniquefeature
K8089
K8089

VELLEMAN NV
Legen Heirweg 33
9890 Gavere
Belgium Europe
www.velleman.be
www.velleman-kit.com

3
Features & specifications
Features :
12/24h clock system
min temp readout:
• celsius: -20°C
• fahrenheit: -4°F
max temp readout:
• celsius: 70°C
• fahrenheit: 158°F
auto toggle function
easy time setting
easy wall mounting
back-up battery
automatic frequency detection
unique extra feature: auto toggle between time/temp and scrolling sign
'OPEN' or 'CLOSED'
Specifications
• power supply: 12VAC (e.g. PS1205AC)
• power consumption: 250mA max. (incl. temp. sensor*)
• backup battery: 3V (CR2032)
• power consumption on backup battery: +/-1mA
• dimensions: 230x74x32mm / 9 x 2.9 x 1.25"
* optional : temperature sensor K8067 or VM132

4
Assembly hints
1. Assembly (Skipping this can lead to troubles ! )
Ok, so we have your attention. These hints will help you to make this project
successful. Read them carefully.
1.1 Make sure you have the right tools:
• A good quality soldering iron (25-40W) with a small tip.
• Wipe it often on a wet sponge or cloth, to keep it clean; then apply
solder to the tip, to give it a wet look. This is called ‘thinning’ and will protect the tip,
and enables you to make good connections. When solder rolls off the tip, it
needs cleaning.
• Thin raisin-core solder. Do not use any flux or grease.
• A diagonal cutter to trim excess wires. To avoid injury when cutting excess
leads, hold the lead so they cannot fly towards the eyes.
• Needle nose pliers, for bending leads, or to hold
components in place.
• Small blade and Phillips screwdrivers. A basic range is fine.
For some projects, a basic multi-meter is required, or might be
handy
1.2 Assembly Hints :
Make sure the skill level matches your experience, to avoid disappoint-
ments.
Follow the instructions carefully. Read and understand the entire step before
you perform each operation.
Perform the assembly in the correct order as stated in this manual
Position all parts on the PCB (Printed Circuit Board) as shown on the
drawings.
Values on the circuit diagram are subject to changes.
Values in this assembly guide are correct*
Use the check-boxes to mark your progress.
Please read the included information on safety and customer service
1.3 Soldering Hints :
1- Mount the component against the PCB surface and
carefully solder the leads
2- Make sure the solder joints are cone-shaped
and shiny
3- Trim excess leads as close as possible to the solder joint
0.000

DO NOT BLINDLY FOLLOW THE ORDER OF THE COMPONENTS ONTO THE TAPE.
ALWAYS CHECK THEIR VALUE ON THE PARTS LIST!
REMOVE THEM FROM THE TAPE ONE AT A TIME !

6
Construction
R1 : 100K (1 - 0 - 4 - B)
R2 : 10 (1 - 0 - 0 - B)
R3 : 22K (2 - 2 - 3 - B)
R4 : 22K (2 - 2 - 3 - B)
R5 : 240 (2 - 4 - 0 - 0 - 1)
R6 ... R37 : 220 (2 - 2 - 1 - B) !
R38 : 1K (1 - 0 - 2 - B)
R39 ... R42 : 10K (1 - 0 - 3 - B) !
R44 : 220 (2 - 2 - 1 - B)
R45 : 2K2 (2 - 2 - 2 - B)
R46 : 10K (1 - 0 - 3 - B)
1. Resistors.
R...
Hint: if you want the mount the clock against a wall, you can use the unstuffed
PCB as a template to mark the drill holes.
D1 : 1N4007
D2 : 1N4007
D3 : 1N4007
D4 : 1N4007
D5 : BAT85
D6 : BAT85
D7 : 1N4148
2. Diodes (check the polarity)
CATHODE
D...
ZD1 : 4V3
ZD2 : 4V3
ZD2 : 4V3
ZD3 : 4V3
3. Zener diodes (check the polarity)
CATHODE
ZD...
Hint: resistors can be soldered at compo-
nent side of the board.
IC1 : 14p
IC2 : 16p
IC3 : 16p
IC4 : 16p
IC5 : 16p
4. IC sockets. Watch the position
of the notch!
IC...
1
C1 ... C11 : 100nF (104)
C13 : 100nF (104)
5. Capacitors
c...
SW1 : Open / closed
6. Switches
SW1.
Hint: mount a screw connector if remote
selection is needed, see step 12.

7
Construction
T1 : BC547
T2 : BC547
7. Transistors
T1
VR1: UA7808
VR2: UA78L05
8. Voltage regulator
SW2 : Sign on/off
SW3 : Hours +
SW4 : Minutes +
10. Push buttons
E1 : CR2032 (3V)
9. Battery holder

SK1 : 2p power 12VAC
SK2 : 3p Temp. sensor
! If remote selection is needed :

SW1 :2p Open/closed
12. Terminal blocks
C12 : 470µF / 25V
13. Electrolytic capacitor.
Watch the polarity !
C...
-
VR...
IC1 : VK8089
(programmed PIC16F630-I/P)
IC2 : 74HC595
IC3 : 74HC595
IC4 : 74HC595
IC5 : 74HC595
15. IC's. Watch the position of the
notch!
2pins:
SK3 : 12h/24h
SK4 : °C/°F
SK5 : Clock/clock+temp
3pins:
hh:mm / hh.mm
11. Pinheaders
Make sure that the heat sink does
not touch C12 !
14. Heat sink

8
Construction
DY1 : 2 x 5pins
DY2 : 2 x 5pins
DY3 : 2 x 5pins
DY4 : 2 x 5pins
1. Tulip pin headers
MOUNT THESE COMPONENTS ON THE PCB SOLDERSIDE, SOLDER
THEM ON THE COMPONENTS SIDE
DY1DY2DY3DY4
5pins
Cut8x5pins
SOLDER SIDE

9
construction
CATHODE
DY1
DY2
DY3
DY4
Make sure that all displays are
correctly mounted !
2. Digit displays
ATTENTION: mount the displays so that the
dot is mounted towards the push button.
DY1DY2DY3DY4
Side with push buttons
3. Assembly of the enclosure
1 Mount the leds, watch the polarity.
display display

10
Construction
4. Test and connection
1. Power supply:
Supply 9-12VAC to the inputs marked '12VAC'.
Make sure supply can deliver 300mA
Make sure to use an AC power supply. If you supply a DC voltage, the
accuracy of the clock will be 5% worst case.
2. Back-up battery:
Insert a 3V CR2032 battery in the battery holder. If power
fails, unit will retain the clock. Display will remain blank.
Note: Accuracy when running on backup battery: 5%
worst case. Consumption: +/- 1mA
CHECK IF THE CLOCK IS WORKING CORRECTLY (see page 13)
5. Optional temperature sensor
If you have ordered an additional temperature sensor K8067
or VM132 then you can let the temperature automatic toggle
with the time and sign.
Connect the terminals marked GND, V+ and IN to the corresponding terminals of
the temperature sensor. As this is a current loop sensor, you can run several
meters of wire between the sensor and the clock.
Optional temperature sensor

11
Optional sensor
Adjusting the temperature sensor (Skip this if there is no temp. sensor connected.
In this case, make sure jumper is set to 'clock').
Put a reliable thermometer next to the temperature sensor and leave it there for a
while. Press and hold 'Min'-button and apply power to the unit. The unit will
display the temperature only (Make sure back-up battery is removed)
Adjust the multiturn pot. (RV1) on the temperature sensor until the displayed
temperature matches the temperature indicated by the thermometer.
Remove and re-apply power to restart the clock. If necessary, insert backup
battery.
K8067/VM132
K8089
6. Jumper settings
Use the shunt to select for choosing the display,
temperature en time readout.
Mode
Jumper placed
Jumper removed
Display clock clock / temperature
Temp °F °C
Time 12h 24h
1
2
3

12
jumper, to select how seconds are indicated.
Jumper setting
1 Assemble the 4 individual housing together.
2 Turn the PCB around with the displays on
top, place the enclosure on the PCB.
7. Assembly in enclosure
hh.mm
hh:mm
hh mm

13
8. Use
Use
Mode
Hour 'Hrs'
Minute 'Min'
Message select
1. Use as thermometer only (no clock):
Hold 'Min'-button and apply power. Unit will display tem-
perature only. If required, you can permanently bridge
the 'Min'-button.
2. Setting the time:
Select 12h or 24h readout by means of the jumper.
Press 'Hrs' to set the hours, press 'Min' to set minutes.
At release, seconds will start from zero.
3. Turning on/off the 'OPEN'/'CLOSED' display.
Press 'Mode' to toggle between 'ON' (show sign) and
'OFF' (do not show sign).
Selecting 'OPEN'/'CLOSED'. The slide switch allows you
to display either 'OPEN' or 'CLOSED'. You can remove
the slide switch and replace it by the supplied screw con-
nector.
By doing so you can easily put an optional switch in a remote location, to se-
lect between 'OPEN' or 'CLOSED'.
4. Extra feature:
Hold 'Hrs'-button and apply power (make sure to remove backup battery first).
Now, the unit displays the approx. AC grid frequency. If required, you can
permanently bridge the 'Hrs'-button.

14
PCB
PCB

15
Schematic diagram
Schematic diagram
R6
R7
R8
R9
R10
R11
R12
R14
R15
R16
R17
R18
R19
R20
R21
R22
R23
R24
R25
R26
R27
R28
R30
R31
R32
R33
R34
R35
R36

Modifications and typographical errors reserved
© Velleman Kit nv H8089IP - 2009 (rev.3)
5 410329 403188
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