CONVERTED PROGRAMMABLE DIGITAL TIMER RELAY
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Additional Information
This is a
converted Tesco TE7 Timer as described in our article
Convert Digital Mains Timer to Low Voltage. It is supplied with a bespoke
relay board which can switch up to
10 Amps of current at up to
30VDC. This combination of timer and relay board gives an enormously
useful and
affordable 12V programmable time switch.
Connecting the Timer
This timer and relay board combination is designed for use with a
12 Volt DC power source - either a
12V battery or a suitable mains transformer. (Contact
neil@reuk.co.uk if you require a 6V or 24V powered system).
Pictured above is the
connection diagram for the timer and relay board. Make sure that all connections are made correctly and securely or the timer and/or relay board may be damaged. The connections are as follows:
A: 12VDC input
B: 0VDC input
C: 1.3VDC output to timer (red)
D: 0VDC output to timer (black)
E: Signal from timer (green, but illustrated above as red with black stripes)
and the relay connections are:
NO: Normally Open
COM: Common
i.e. the relay switch is closed (current will flow through it)
only when the relay is energised by the signal from the converted timer in its ON state.
Whenever the converted timer is
ON - either because user has selected the
MANUAL ON mode or because it has come on automatically due to a user-entered programme, the green LED will light up and the relay switch will close. This will connect the load device - lighting, pump, etc - to the power source turning it on.
When the converted timer is
OFF. - either because the user has selected
MANUAL OFF mode or because it is programmed to be OFF, the green LED will be turned off and the relay switch open. This disconnects the load device from the power so it too will be off.
This conversion is fitted with a small backup
NiMH rechargeable cell which will enable all stored programmes and the current time to be retained (for over
100 hours) if/when the 12V power source is disconnected. This cell is automatically
trickle charged when the circuit is connected to the 12V power source so it is always ready when it is needed.
Programmable Timer Specifications
The Tesco TE7 is a
7 day programme electronic timer with a random function and
10 ON/OFF programmes which can be set to 1 minute accuracy.
There are 16 pre-programmed combinations of day or blocks of days available to make setting the timer to do what you want easier:
One day per week: MO or TU or WE or TH or FR or SA or SU
Every Day: MO TU WE TH FR SA SU
Weekdays Only: MO TU WE TH FR
Weekends Only: SA SU
Every Day bar Sunday: MO TU WE TH FR SA
Every Other Day: MO WE FR, or TU TH SA or MO WE FR SU
First Half of Week: MO TU WE
Second Half of Week: TH FR SA
The user can select either MANUAL ON, AUTO, or MANUAL OFF mode for total control. This timer even has an easy to use
summer time mode which makes it quick to change to time when the clocks go forward for BST.
The timer is supplied with its original
instruction manual, and setting the programmed ON and OFF times is very simple.
Related REUK.co.uk Articles
Convert a cheap digital mains timer into a low voltage programmable timer relay
Automatically control devices with a 12 Volt powered timer switch
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