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This is only a preview of the November 2003 issue of Silicon Chip. You can view 27 of the 104 pages in the full issue, including the advertisments. For full access, purchase the issue for $10.00 or subscribe for access to the latest issues. Items relevant to "A 12AX7 Valve Audio Preamplifier":
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A programmable PIC-powered timer
This PIC-based programmer can provide timing intervals from
one second to over 16,320 hours (680 days) with features
such as the ability to produce up to eight separate
timing events with loop control, one minute on, then one
second off, one hour on, one day off, one week on and more.
“I
s it accurate?” you ask. You
betcha! Hard to program,
complicated and expensive
to build? Not at all.
Most timers seem to be capable of
only doing the one same thing, in
allowing only one timing duration
period with the relay either on or off
during the timing cycle.
But this PIC-based timer is capable
of up to eight individual ON/OFF
event times of up to 2040 hours ON/
OFF for each event. Seconds, minutes
and hours programming in binary,
with a one second resolution to boot,
is all possible.
Loop control allows all timing
events to run in a continuous cycle
all year round.
All eight timing events are executed
in a sequential fashion and therefore
can be chained together to give one
extremely impressive timing delay
of 16,320 hours – or the best part of
two years!
78 Silicon Chip
A LED bargraph menu display is
used when programming the timer,
making operation a breeze.
It can be powered from eight AA
batteries or a 12VDC plugpack. All
settings can be saved in EEPROM
memory.
You can even configure it to automatically open and then run these
pre-saved settings on power up.
Programming is achieved via a set
of eight DIP switches that are used
to set the various ON/OFF, seconds/
minutes/hours times in BCD (Binary
Coded Decimal).
If you don’t know binary, it’s not
hard at all. Binary simply consists of
BITs, (BInary DigiTs) and in our case
we are playing with eight BITs.
Each BIT has an assigned decimal
value starting at 0 or 1 for BIT 1, 0 or 2
for BIT 2, 0 or 4 for BIT 3, 0 or 8 for BIT
By TRENT JACKSON
4 and so on. The BIT values in decimal
keep on doubling (ie, 1,2,4,8,16, 32,64
and 128).
With eight BITs to play with, we
can add their decimal values together
to give us any number from 1 to 255.
Here’s a simple example. To obtain
a decimal value of 3 using our eight
switches, we would use the following
switch setttings: S1 = ON, S2 = ON, S3,
= OFF, S4 = OFF, S5 = OFF, S6 = OFF,
S7 = OFF, S8 = OFF.
To make life easy, the switch
number equals the BIT number. So
as you can see we are simply adding
the ON/OFF status of the switches
together in various combinations
to achieve many different decimal
numbers.
There are 255 possible combinations, thus the maximum number that
we can create would be 255.
The eight DIP switches are also used
to set various options and parameters
for the timer during the programming
www.siliconchip.com.au
mode. We’ll give more info on this
later.
Circuit description
One PIC16F628 microcontroller, a
10-LED bargraph menu display, relay,
piezo buzzer, DIP switches and diodes
plus a handful of other low-cost components is all it really takes.
If you thought that the PIC16F84
was great, the 16F628 is even better,
with double the program memory,
double RAM and EEPROM and – the
best part – it’s even cheaper.
The PIC is clocked by a crystal at a
rate of 8MHz. Ports RB0 to RB7 on the
PIC are used as inputs for collecting
data from the DIP switches and as
outputs for driving the LED bargraph
menu display. This display shows
exactly what we are doing during the
programming side of things.
It indicates whether we are programming the seconds/minutes/hours,
ON or OFF times, and so on.
www.siliconchip.com.au
Ten 680Ω resistors limit the current
to the display while eight 47kΩ resistors are used as pull-ups for RB0- RB7
when they are used as inputs. Two
momentary pushbuttons are used for
selecting the menu fields in the display, and entering data.
Port RA1 controls the buzzer and
an Acknowledge LED (LED11) which
indicates buttons being pushed and
data being accepted or rejected while
programming.
This LED is in series with the
buzzer and a 27Ω resistor which can
be increased or decreased in order to
alter the volume level from the buzzer.
The number of times the Acknowledge LED flashes and the buzzer beeps
indicates what is going on inside the
microcontroller’s brain at any given
time.
Pressing the Menu button will
cause the LED to flash once and the
buzzer to issue one single soft & fast
chirp. Pressing the Enter button will
cause the LED to flash three times
and the buzzer to chirp three times
as well. Invalid data will give two
loud beeps.
After pressing the Enter button, the
PIC will read whatever data is on the
programming DIP switches and then
quickly process it. If the data is invalid,
there will be two loud beeps and two
flashes from the LED.
Port RA0 controls the switching
of the relay via transistor Q1 which
is forward biased via a 2.7kΩ resistor
when RA0 goes high. Diode D12 is connected across the relay coil to protect
transistor Q1 from back-EMF spikes
when the relay turns off.
RA2 is used to enable/disable the
DIP switches. RA2 goes low when the
PIC wants to read the switches. At all
other times RA2 is high, to avoid the
switches from interfering with the
LED display.
The eight diodes that connect to
PORTB are used to ensure that the DIP
November 2003 79
80 Silicon Chip
www.siliconchip.com.au
switches do not interfere with the LED
menu display while PORTB is used
as outputs. RA0 on PORTA ensures
that these diodes are reverse- biased
when PORTB is set to output data to
the display.
RA0 briefly swings low for a few
microseconds to allow correct biasing
of the diodes, to enable the switches
when they need to be read.
Menu programming
All programming is achieved by
following the menu system described
overleaf. It really is quite simple
once you get the hang of the BCD
BIT values.
Massive time duration
You may wonder how we can get
a time delay of 2040 hours if we are
limited to 255 hours of time delay
setting.
If you look at the programming
chart, you will note there is a function
under the “Hours ON/OFF” which
sets X1, X2, X3, etc. These are the
multiplication factors – what ever
you set here multiplies the hours set.
So if you have 200 hours set with a
multiplication factor of five, you’ve
got 1000 hours. The highest multiplication factor is eight (X8), and 8 x
255 = 2040.
All components mount on one PC board. It is strongly suggested that a socket be
used for the PIC chip. There are minor differences in the prototype shown above.
But wait, there’s more!
If you want even longer periods,
you could set a number of events.
Say you set four events with 2040
hours, you now have 8160 hours, or
340 days.
Want your Christmas Tree lights to
come on for the same week each year?
OK, it’s crazy but it gives some idea of
the flexibility of this timer.
The theoretical maximum is 255
events x 2040 hours or 59.383 years.
Possible? Yes it is – the PIC micro is
guaranteed to retain its flash memory
program for forty years, so what’s a few
more years between friends?
Programming event numbers easy:
just get into the “Event Number” field
on the menu and then select the appropriate DIP switches to the events
required.
Special functions
Along with the event numbers,
there are a several special functions
available.
Programming in a special function
option is also done by setting the DIP
www.siliconchip.com.au
switches to the binary code that is allocated to the function, then pressing
the “Enter” button.
If Auto Run is enabled then whatever data is in the non-volatile EEPROM
will automatically open, load and
execute at power up.
Save Data will save the current time
durations and configuration data into
non-volatile EEPROM.
Open Data will replace all the current settings with whatever is in the
EEPROM (any data which you have
entered before executing the Open
Data command will be lost).
Reset Events will clear all current
data that you have entered, without affecting the EEPROM. Reset All, on the
other hand will wipe out everything
including the data in non-volatile
memory. It will also reset all options
back to their defaults.
Construction
All the circuit parts are mounted
on a PC board coded 04111031 and
measuring 121 x 78mm.
Assembly is quite straightforward.
Start with the resistors and diodes
(watch the diode polarities!) and then
place the larger components.
The three shorter links can be made
from component lead offcuts. However, the longest link may be too long
for this – you’ll probably need a short
length of tinned copper wire.
The two pushbutton switches must
be oriented with their flat sides closest
November 2003 81
Parts List – Master of Time
1 PC board coded 04111031, 121 x 78mm
1 2.5mm PC-mount DC power connector
1 12VDC DPST PC-mount 240V 10A relay
2 PC-mount momentary pushbutton switches
1 3-way PC-mount terminal block connector
1 8-way DIP switch 1 8MHz crystal (X1)
1 18-pin IC socket 5 6mm x M3 machine screws
1 M3 nut & washer (for securing regulator REG1)
4 10mm x M3 standoffs
1 set of labels to suit project
1 12VDC 150mA plugpack
1 short length of tinned copper wire (PCB links)
Semiconductors
1 PIC16F628 PIC micro programmed with “MOT.hex ver 3.0” (IC1)
1 LM7805 3-terminal regulator (REG1)
1 BC548 or similar NPN transistor (Q1)
1 red 10-LED bargraph display (LED1 - 10)
1 green 5mm LED (LED 11)
10 1N914 silicon signal diodes (D1 - D10)
4 1N4004 power diodes (D11 - D14)
Capacitors
1 100µF 25V PC electrolytic
1 10µF 16V PC electrolytic
2 100nF MKT polyester
2 22pF ceramic disc
Resistors (0.25W, 1%)
2 10kΩ
8 47kΩ
1 82Ω 1W 5%
1 27Ω
to (and parallel with) the edge of the
PC board.
Leave the semiconductors (especially the PIC chip) until last; indeed,
it’s a good idea to leave the PIC chip
out of its socket until after checking
everything. Again, take careful note
of semiconductor polarity and/or
orientation.
No case or other enclosure details
are given – we figure that most timers
would be built into whatever they are
controlling.
The prototype had four 5mm threaded stand-offs to act as “feet” while
checking and then as anchor points
later on.
After giving the completed board
a thorough visual check for both
component placement and quality of
soldering, you’re ready to apply power
and check voltages.
First, confirm that you have a +5V
supply by measuring between the
middle and lower legs of the 7805
regulator (this assumes that you have
the switches at the bottom as shown in
our drawing and photograph).
Just make sure you don’t short the
82 Silicon Chip
1 2.7kΩ
1 15Ω
10 680Ω
legs out with your multimeter probes.
Also confirm that the 5V supply is
reaching the PIC chip socket – measure
between pins 4 and 5.
You should also make sure that the
relay is going to work when required
by shorting pin 1 of the PIC socket
to +5V (without the PIC in place!).
This should turn on Q1, pulling in
the relay.
Some relays give a good “click”
when they pull in but others are very
hard to hear. If you’re in any doubt,
rig up something to switch with the
relay contacts, such as a small 12V
lamp (or a LED and 1kΩ series resistor)
connected across the 12V supply via
the contacts.
If everything checks out OK, disconnect power, wait a few minutes for any
capacitors to discharge, then plug in
the PIC chip. (Do we have to mention
orientation again?).
Now you’re ready to start programming.
A programming example
Let’s say for example that you have
a pool filter that you’d like to have
turn on for two hours every day of
the year.
OK, let’s assume that power is applied and the hours ON/OFF is set to
the X1 factor and the Event Number
LED is on in the menu. By the way, X1
is the default.
First, start by selecting event DIP
switch 1. It should be ON; all the rest
set to OFF. Press the Enter (S2) button,
followed by pressing the Menu button
(S1) until the Hours & Relay ON Time
LEDs are ON.
Now set DIP switch 2 ON and all the
rest OFF, press Enter again and then
Menu until the Hours & Relay OFF
Time LEDS are now ON.
04111031
www.siliconchip.com.au
Software Menu System Explained
When power is applied, the PIC will initiate a simple self test. All the LEDs will briefly light and the buzzer
will chirp. Then the Event Number and Power Applied LEDs will be on. Toggling the “Menu” button allows
selection of the various items within the menu system. Pressing the “Enter” button causes the software
to read the status of the DIP switches and place the data into the currently selected field. The first item
in the menu structure is the “Event Number”, which has a default of 1. Unless we want to program in
data for another event, we can skip this menu item by pushing the “Menu” button. Everything except
“Event Number” assumes a default value of 0 (zero). There is no need to erase previous settings – you
simply write over them with new values. And if you don’t need to use a particular menu item (such as
“Hours”), simply leave it set to the default.
The basic data entry format is Seconds/Minutes/Hours for both Relay ON and Relay OFF times.
www.siliconchip.com.au
Here’s what you can expect to
see after pushing the “Menu”
button for the first time. Use
the 8 DIP switches to select the
number of seconds (in binary),
then press “Enter”, followed by
“Menu”.
Now enter the number of minutes that you require the relay
to be off. Made a mistake, or
want to change a value in a
field? Simply write over it and
press the “Enter” button.
Minutes, Relay ON Time field: It
is as you did with the seconds,
except now enter the number
of minutes that you want for
the current event, then press
“Enter”, followed by “Menu”.
Last in the time setting functions is the Relay Off Hours.
The hours x option can be
used to create enormous
delays – up to 2040 hours
for each event. Refer to the
binary special functions chart
for more info.
Enter the number of hours
that you require. Remember, if
you don’t want hours (or any
other parameter) simply press
“Menu” to skip it. Provided that
no data already exists, any field
(except “Event Number”) will
default to zero.
The “Loop Events” function
can be used to cycle the events
to run continuously. Toggle
“Enter” to enable or disable
it. When it is enabled, the LED
will flash (default is disabled).
Next is the “Relay OFF Time”.
It is simply the amount of time
that the relay stays off until the
next event is executed. So if you
want an event to occur at the
same time tomorrow and your
“Relay ON Time” is 3:30:00,
the “Relay OFF Time” would be
20:30:00. Press “Enter” then
“Menu” to move on.
Ready for action? Let’s run
this baby! Toggle “Enter” to
start/stop execution of your
program. The LED will flash
while it is running. Stop the
timer and press Menu to go
back to “Event Number”
November 2003 83
Now we need to set in an OFF time of 22 hours. With 24
hours in a day, we want it ON for two hours and OFF for
22 hours. In 8-bit binary that number would be 00010110.
BITs 2, 3 & 5 will need to be set, therefore switches 2, 3 &
5 must be set ON, all the rest set OFF.
Do that, then press Enter and use the Menu button to
scroll down to Loop Events. Toggle Loop Events ON by
pressing Enter.
Then it’s just a matter of pressing Menu again to go down
to Run/Stop, followed by Enter.
If all is well, the relay should switch ON for two hours
then switch OFF for 22 hours, then repeat the cycle over
and over again until you hit the Enter button again to break
the timing loop.
RELAY
RELAY ON / OFF TIME DURATIONS
DURATIONS BINARY
BINARY PROGRAMMING
PROGRAMMING CHART
CHART
1
2
3
4
5 OGRAMMING
6
7 CHART
8T
(DIP
1 ~ 8Switch
) TIMING EVENT
SELECTION
BINARY
Y PROGRAMMING
BINAR
PR
CHAR
Dec Switch
Value
16
32
64
128
DIP
11
22
34
48
5
6
7
8
( 1 ~ 8 ) TIMING EVENT SELECTION BINARY
BINARY PROGRAMMING
PROGRAMMING CHART
CHART
DIP Switch
1
2
3
4
5
6
7
8
Dec Value
1
2
4
8
16
32
64
128
Sec/Min/Hr
- Select the desired Sec/Min/Hr field on the Led menu display by toggling the menu button. Set
the appropriate Dip switch codes in for your desired delay times, then press the “Enter” button.
1
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
2
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
3
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
4
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
5
ON
OFF
ON
OFF
OFF
OFF
OFF
OFF
6
OFF
ON
ON
OFF
OFF
OFF
OFF
OFF
7
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
8
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
9
ON
OFF
OFF
ON
OFF
OFF
OFF
OFF
10
OFF
ON
OFF
ON
OFF
OFF
OFF
OFF
11
ON
ON
OFF
ON
OFF
OFF
OFF
OFF
12
OFF
OFF
ON
ON
OFF
OFF
OFF
OFF
13
ON
OFF
ON
ON
OFF
OFF
OFF
OFF
14
OFF
ON
ON
ON
OFF
OFF
OFF
OFF
15
ON
ON
ON
ON
OFF
OFF
OFF
OFF
16
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
17
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
18
OFF
ON
OFF
OFF
ON
OFF
OFF
OFF
19
ON
ON
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
ON
OFF
OFF
OFF
20
OFF
OFF
21
ON
OFF
ON
OFF
ON
OFF
OFF
OFF
22
OFF
ON
ON
OFF
ON
OFF
OFF
OFF
23
ON
ON
ON
OFF
ON
OFF
OFF
OFF
24
OFF
OFF
OFF
ON
ON
OFF
OFF
OFF
25
ON
OFF
OFF
ON
ON
OFF
OFF
OFF
26
OFF
ON
OFF
ON
ON
OFF
OFF
OFF
27
ON
ON
OFF
ON
ON
OFF
OFF
OFF
28
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
29
ON
OFF
ON
ON
ON
OFF
OFF
OFF
30
OFF
ON
ON
ON
ON
OFF
OFF
OFF
31
ON
ON
ON
ON
ON
OFF
OFF
OFF
32
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
33
ON
OFF
OFF
OFF
OFF
ON
OFF
OFF
34
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
35
ON
ON
OFF
OFF
OFF
ON
OFF
OFF
36
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
37
ON
OFF
ON
OFF
OFF
ON
OFF
OFF
38
OFF
ON
ON
OFF
OFF
ON
OFF
OFF
39
ON
ON
ON
OFF
OFF
ON
OFF
OFF
40
OFF
OFF
OFF
ON
OFF
ON
OFF
OFF
41
ON
OFF
OFF
ON
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
42
OFF
ON
OFF
ON
43
ON
ON
OFF
ON
OFF
ON
OFF
OFF
44
OFF
OFF
ON
ON
OFF
ON
OFF
OFF
45
ON
OFF
ON
ON
OFF
ON
OFF
OFF
46
OFF
ON
ON
ON
OFF
ON
OFF
OFF
47
ON
ON
ON
ON
OFF
ON
OFF
OFF
48
OFF
OFF
OFF
OFF
ON
ON
OFF
OFF
49
ON
OFF
OFF
OFF
ON
ON
OFF
OFF
50
OFF
ON
OFF
OFF
ON
ON
OFF
OFF
51
ON
ON
OFF
OFF
ON
ON
OFF
OFF
52
OFF
OFF
ON
OFF
ON
ON
OFF
OFF
53
ON
OFF
ON
OFF
ON
ON
OFF
OFF
54
OFF
ON
ON
OFF
ON
ON
OFF
OFF
55
ON
ON
ON
OFF
ON
ON
OFF
OFF
56
OFF
OFF
OFF
ON
ON
ON
OFF
OFF
57
ON
OFF
OFF
ON
ON
ON
OFF
OFF
58
OFF
ON
OFF
ON
ON
ON
OFF
OFF
59
ON
ON
OFF
ON
ON
ON
OFF
OFF
60
OFF
OFF
ON
ON
ON
ON
OFF
OFF
*Up
255BIT
BITcombination
combinations
codes
possible.
Should
sufficient
most
cases.
Up
toto
255
codes
areare
possible.
(1 ~(1~60)
60) Should
bebe
sufficient
in in
most
cases
though.
*
EventValue
Num
Dec
1
2
4
8
16
32
64
128
1
Event2 Num
3
14
25
36
47
58
ON
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
OFF
ON
ON
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
ON
OFF
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
*
*
6
OFF
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
if no event number is selected, the data will be placed in event “1” location
* Event7 “1” Is default,ON
ON
ON
OFF
OFF
OFF
OFF
OFF
8
OFF
OFF
OFF
ON
OFF
OFF
* Event “1” Is default, if no event number is selected, the data will be placed in event “1” location
SPECIAL FUNCTION OPTIONS BINARY
BINARY PROGRAMMING
PROGRAMMING CHART
CHART
DIP Switch
1
2
3
4
5
6
7
8
SPECIAL
OPTIONS
BINAR
PR
CHAR
Dec ValueFUNCTION
1
2
4 BINARY
8 Y PROGRAMMING
16 OGRAMMING
32
64 CHART
128T
DIP
Switch - To enter
1 into options
2 mode: 3Select “Event
4 Number” in5 menu, set6all switches7“ON” press 8Enter
Function
Dec ValueX 1
button, Event Number Led will flash. Now enter in the function codes, Menu button to exit mode.
1
2
4
8
16
32
64
128
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
X2
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
- To enter into options mode: Select “Event Number” in menu, set all switches “ON” press Enter
Hours
ON X 3
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
Function
button, Event Number Led will flash. Now enter in the function codes, Menu button to exit mode.
Hours ON X 4
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
Hours ON
ON XX 15
ON
OFF
ON
OFF
OFF
OFF
OFF
OFF
Hours
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
Hours
ON
X
6
OFF
ON
ON
OFF
OFF
OFF
OFF
OFF
Hours ON X 2
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
Hours ON
ON XX 37
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
Hours
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
Hours ON
ON XX 48
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
Hours
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
Hours ON
OFF X
X 51
ON
OFF
OFF
ON
OFF
OFF
OFF
OFF
Hours
ON
OFF
ON
OFF
OFF
OFF
OFF
OFF
Hours
OFF
X
2
OFF
ON
OFF
ON
OFF
OFF
OFF
OFF
Hours ON X 6
OFF
ON
ON
OFF
OFF
OFF
OFF
OFF
Hours
OFF
X
3
ON
ON
OFF
ON
OFF
OFF
OFF
OFF
Hours ON X 7
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
Hours OFF X 4
OFF
OFF
ON
ON
OFF
OFF
OFF
OFF
Hours ON X 8
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
Hours OFF X 5
ON
OFF
ON
ON
OFF
OFF
OFF
OFF
Hours OFF X 1
ON
OFF
OFF
ON
OFF
OFF
OFF
OFF
Hours OFF X 6
OFF
ON
ON
ON
OFF
OFF
OFF
OFF
Hours
OFF
ON
OFF
ON
OFF
OFF
OFF
OFF
Hours OFF
OFF XX 27
ON
ON
ON
ON
OFF
OFF
OFF
OFF
Hours
ON
ON
OFF
ON
OFF
OFF
OFF
OFF
Hours OFF
OFF XX 38
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
Hours
OFF X 4
OFF
OFF
ON
ON
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
Save Data
Hours
OFF X 5
ON
OFF
ON
ON
OFF
OFF
OFF
OFF
Open Data
OFF
ON
OFF
OFF
ON
OFF
OFF
OFF
Hours
OFFON
X6
OFF
ON
ON
ON
OFF
OFF
OFF
OFF
Auto Run
ON
ON
OFF
OFF
ON
OFF
OFF
OFF
Hours
OFFOFF
X7
ON
ON
ON
ON
OFF
OFF
OFF
OFF
Auto Run
OFF
OFF
ON
OFF
ON
OFF
OFF
OFF
Hours
OFF X 8
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
Reset Events
ON
OFF
ON
OFF
ON
OFF
OFF
OFF
Reset Data
“ALL”
OFF
ON
ON
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
ON
Save
ON
* Hours
Hours ON
*
*
*
*
*
Open Data
OFF values.ON
OFFfunctionOFF
ONsaved data
OFF
OFF
OFF
Denotes default
Reset “ALL”
deletes all
& restores
factory defaults
Auto Run ON
ON
ON
OFF
OFF
ON
OFF
OFF
OFF
Auto Run OFF
OFF
OFF
ON
OFF
ON
OFF
OFF
OFF
Reset Events
ON
OFF
ON
OFF
ON
OFF
OFF
OFF
Reset “ALL”
OFF
ON
ON
OFF
ON
OFF
OFF
OFF
* If you don’t wish to erase all of the timing data in any
Denotes default values. Reset “ALL” function deletes all saved data & restores factory defaults
given event, you can just erase what you don’t require in
a menu field by setting all the switches to “OFF” and then
pressing “Enter”. This effectively sets the timing interval
to zero and therefore will not be executed as a delay (the
software will see a value of “0” and skip it automatically).
Wheredyagedit?
This project was developed by the author for Global Unlimited Pty Ltd, who retain copyright in the PIC microcontroller
code but have released the PC board and circuit.
Global Unlimited have three different kits available which
should meet the needs of most constructors.
Kit 1 includes all components, the PC board, etc (but does
not include a plugpack) for $64.95 including GST.
Kit 2 is the same but is pre-built and tested and includes a
12-month warranty, for $89.95 including GST.
84 Silicon Chip
Finally, for those who wish to “do their own thing” they have
the pre-programmed PIC 16F628 microcontroller available
for $24.00 (inc GST).
All prices include packing and postage to anywhere in
Australia (allow up to 28 days for delivery). Cheques should
be made payable to Global Unlimited Pty Ltd.
Global Unlimited can be contacted on (02) 4566 3218,
or (02) 4566 3168. Their postal address is PO Box 3286,
SC
Dural NSW 2158.
www.siliconchip.com.au
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