User Manual · DJ Tech Schedule Timer

1Know your bell unit

The bell unit keeps its own clock and stores your bell times. Once a timetable is sent to it and switched on, it rings the bell by itself, every day. Your phone does not need to stay nearby.

The display

At power-on, for about 3 seconds, with one short beep:

DJ TECH SMART WIRELESS SCHEDULE TIMER Version 2.2 BASIC

A PRO unit shows Version 2.2 PRO.

Normal running screen:

14:01:00 ID6 MTWTF-- 14/10/2026 WED LOCAL ACTIVE: NORMAL NEXT: 15:30 (3s)

On the screen	Meaning
14:01:00	The unit's clock. It is set from your phone every time you upload, or when you tap Sync clock.
ID6	This unit's ID number (0 to 7), set by the three small switches inside the unit.
MTWTF--	The days the running timetable rings on, Monday first. A dash means that day is off.
LOCAL	How the unit is linked: LOCAL = the app is connected on the unit's own WiFi. PRO only: NET = online, control from anywhere is ready; WIFI = joined the internet WiFi, not online yet; SRCH = looking for the internet WiFi; PASS = the WiFi password was refused. Empty = no phone connected.
ACTIVE	The timetable that is running now, by its name, or NONE.
NEXT	The next bell and how long it rings. When no more bells are due today, it shows the day, for example NEXT: TUE 09:00 (3s).

Other messages on the display

Message	Meaning
BELL RINGING!	A bell from the timetable is ringing.
EMERGENCY ALARM	The bell is being rung by hand from a phone.
PAIRING CODE	A phone tapped SEARCH UNIT. Type the 6 digits in the app (section 3).
Data Received!	A timetable arrived from the app. Its name is shown below.
Clock Updated!	The clock was set from the app.
PHONE PAIRED	A phone was paired with the unit.

The status light

Light	Meaning
Short flash every 10 s	The unit is on and working. No phone is connected.
Even blinking	A phone has joined the unit's WiFi, but the app is closed or not paired with this unit.
Steady on	The app is connected. Ready to receive bell times.
Off	No power to the unit.

The buzzer

Sound	Meaning
One short beep	The unit received something from the app, or the app connected.
Two short beeps	A timetable was switched off, or the app disconnected.
Continuous sound	The bell is ringing. The buzzer sounds with it.
No beep	The unit did not accept the command.

The display light

To save power, the display light switches off 3 minutes after the last activity. The unit still works and bells still ring. The light comes back by itself when a bell rings, when the app connects or sends something, or when a phone joins the unit's WiFi.

2Install the app

The app is for Android phones. It is not in the Play Store; you get it from the QR code on the bell unit.

Scan the QR code on the bell unit with the phone camera.
On the page that opens, tap Download the app.
Open the downloaded file.
If the phone asks, tap Settings, switch on Allow from this source, and go back.
Tap Install, then Open.
The first time, allow notifications and alarms when the app asks.

To update the app later, scan the same QR code and install again. Your timetables stay on the phone.

3First-time setup and pairing

Each phone must be paired with the unit once. Pairing needs the code shown on the unit's display, so only someone standing at the unit can add a phone.

Power on the unit. After the welcome screen, note the ID on the top line, for example ID6.
Join the unit's WiFi. In the phone's WiFi settings choose DJ TECH Bell v2.2. The password is 88888888.
Stay connected. The phone will say this WiFi has no internet. That is correct. Choose to keep the connection. Keep mobile data ON too. If the phone's screen locks by itself, that is not harmful: see "Screen was auto-locked".
Open the app. On the home screen, press and hold RING for 5 seconds. The Device ID Configuration page opens.
Set the ID. Tap the three switches until the large number equals the unit's ID.
Tap SEARCH UNIT. The unit beeps and its display shows PAIRING CODE with 6 digits, for 1 minute.
Type the code in the app and tap Pair. The unit shows PHONE PAIRED and beeps once.
Done. The app shows Connected, and the unit's light is steady.

PAIRING CODE 482913 Type it in the app

Example only. The code is random and different every time.

One code, one phone

Each code works for one phone only. As soon as a phone is paired, the unit makes a new random code. The next phone must read the new code from the display.

What happens	Code on the display
Phone A taps SEARCH UNIT	482913
Phone A pairs with 482913	Changes to 739201
Phone B taps SEARCH UNIT and pairs with 739201	Changes to 058463
Someone tries 482913 again	Refused, it is an old code

Pairing is needed only once per phone. A paired phone never types the code again, also when used through the internet.

After a factory reset, all paired phones are removed and the unit makes a new code. Every phone, the primary and all others, must pair again.

Wrong code 5 times locks pairing for 5 minutes, and the unit makes a new code. Wait, then tap SEARCH UNIT again and read the new code.

4The home screen

Clock. The time on your phone. The unit's clock is set to this time whenever you upload.
Five timetable buttons. Each shows its name (for example NORMAL or EXAM, or TIMER 1 if it has no name). The small line, for example 8 Sch/6 Days, means 8 bell times on 6 days. NO Sch means nothing is set.
RING (Manual). Tap to ring the bell by hand. Hold for 5 seconds to open the Device ID page.
Next Bell. The next bell of the running timetable, with a countdown. 09:45.03 means 9:45, ringing for 3 seconds.
Bell icon at the right of Next Bell: opens the phone alert settings.
… Schedule. Tap to see all bell times of the running timetable in one list.
Connection bar. Connected, Searching or Disconnected.
Three-dot button at the right of the connection bar: opens Tools.

Timetable button colours

Colour	Meaning
Green, glowing	This timetable is running.
Red	Bell times are saved, but it is switched off.
Grey	No bell times set yet.

5Set bell times

Each of the five timetables is separate, for example one for normal days, one for exam days and one for half days. Each holds up to 30 bell times. A bell time is called a preset.

Tap a timetable button on the home screen. The page opens locked, so nothing changes by accident.
Tap MODIFY (pink). The page unlocks.
Choose the days. Tap MO to SU at the top. Green days are on. At least one day is needed.
Set each preset. Slide the Hour, Minute and Duration wheels. Duration is the ring length, 1 to 5 seconds. A preset you change gets an orange border until you save.
Tap SAVE. A green message says "Presets saved successfully", and the page locks again.
Send it to the unit. With the app Connected, move the slide switch to UPLOAD and tap UPLOAD. The unit shows Data Received! and beeps once.

Timetable page, editing — After MODIFY (edit)

Uploading also sets the unit's clock from your phone and makes that timetable the running one. Make sure the phone's time is right.

Give a timetable a name

Hold the name at the top of the page for 5 seconds. A text box appears. Type up to 12 letters or digits, for example EXAM, then tap Done. The name shows in the app and on the unit's display after the next upload.

Clear a timetable

After MODIFY, hold SAVE for 5 seconds. It turns red and reads RESETTING. All presets, days and the name are cleared, on the phone and on the unit.

The app will not save when no day is selected, a preset has a time but duration 0, a preset has a duration but time 00:00, or every preset is empty. An orange Cannot Save box tells you which preset to fix. To leave a preset unused, set all three values to 00.

6Switch a timetable on or off

Press and hold the timetable button for 3 seconds. A ring fills up around your finger.
It turns green and glows. The unit beeps once and shows ACTIVE: with its name.
To switch it off, hold the green button for 3 seconds. The unit beeps twice.

Only one timetable runs at a time. Switching another one on replaces it. The unit remembers the running timetable through a power cut.

If the phone is not connected, the timetable is switched on in the app only, and the app tells you. Connect and hold the button again.

7Ring the bell by hand

On the home screen, tap RING.
Press and hold the round orange button. It turns red and reads RINGING, and the unit shows EMERGENCY ALARM.
Let go to stop.

For safety, the bell stops by itself after 5 seconds, even if the phone loses the connection. It can never stay on.

A quick tap does nothing, so the bell cannot ring by a slip of the finger. Timetable bells are not affected.

8Bell alerts on your phone

When a bell is due, your phone alerts you too, even away from the unit.

Your phone is	What you get
Showing the app	A banner "Bell Ringing!" with tone and vibration.
Showing another app	A pop-up notification with tone.
Locked	The screen lights up and shows the notification with tone.

Alert settings

Tap the bell icon beside Next Bell:

Push Notification: switches phone alerts on or off.
Notification Sound and Vibrate.
Bell Sound Selection: the phone's own sound, or your own MP3 file. Test Sound plays it.
Allow these once: Banner & Lock Screen, Display Over Other Apps, Run in Background.

On OPPO, Vivo, Xiaomi and similar phones, also allow Auto-launch for the app in the phone's settings, or alerts may stop when the app is closed.

9Tools and keeping in step

Tap the three-dot button on the connection bar.

Tool	What it does
Sync clock	Sets the unit's clock to the phone's time. Use it after the unit's clock battery is changed, or when it shows CLOCK NOT SET.
Sync schedules	Copies all 5 timetables from the unit to this phone.
Features	What the schedule timer can do, BASIC and PRO.
User manual	Opens this page.
Export timers PRO	Saves all 5 timetables to a file and shares it (WhatsApp, email, Drive).
Import timers PRO	Loads all 5 timetables from such a file. Then upload each one to the unit.

When more than one phone is used

Every time your phone connects, the app checks the unit. A small window shows the result:

Timers up to date: nothing to do.
Update completed: another phone had changed timetables; they were copied to your phone.
Send your changes?: your phone has saved changes the unit does not have. Choose Send now or Later.

An orange bar "Timers on the bell were changed" means your copy is old. Tap it to sync.

10Phones and unit ID

Phones on a BASIC unit BASIC

Up to 3 phones can use a BASIC unit: one primary (the first one paired) and two secondary. The list is on the Device ID page. The primary phone can REMOVE a phone or MAKE PRIMARY another one.

To take your own phone off the unit, hold RESET on the Device ID page for 5 seconds.

Unit ID and more units

Every unit has an ID from 0 to 7, set by three small switches. Up to 8 units can work in one building. The app controls only the unit whose ID it is paired with, so units are never mixed up.

Move the three switches inside the unit to the new position.
Wait 3 seconds. The unit shows ID CHANGED TO and restarts with the new ID.
In the app, set the same ID on the Device ID page and tap SEARCH UNIT.

Up to 4 phones can be on the unit's WiFi at the same time.

11Upgrade to PRO

A BASIC unit becomes PRO with one code. Same unit, no new hardware. PRO adds control from anywhere, master and users with PINs, the record of changes, and saving timetables to a file.

On the Device ID page, find the gold card Upgrade to PRO.
Give the Serial number on the card to your dealer (tap the copy icon to copy it).
The dealer gives you an 8-digit code made for this unit only.
With the phone on the unit's WiFi, tap ENTER UNLOCK CODE, type the code and tap Send.
The app says This bell unit is now PRO. The unit shows PRO UNLOCKED.

12PRO: control from anywhere PRO

The unit can join a WiFi with internet (campus WiFi or a phone hotspot). Then the app works from anywhere: timetables, switching, clock and ringing by hand.

With the phone on the unit's WiFi, open the Device ID page and find Remote Access (Internet).
Type the WiFi name and WiFi password of the internet WiFi.
Tap SEND WIFI TO BELL. The unit shows Internet WiFi Set!
Wait about a minute. The unit's display shows NET when it is online, and the card says Remote access is ready.
Now the app works on mobile data too, away from the unit.

If the internet goes down, the bells still ring on time as usual.

To remove the internet WiFi, hold REMOVE on the card for 5 seconds.

13PRO: master, users and record PRO

On a PRO unit, one master and up to 5 users can change the bells, each with their own mobile number and 4-digit PIN.

Set a master on the first day. Until a master is set, any paired phone can change the bells.

Set the master

On the Device ID page, tap USERS & ACCESS.
Type your mobile number and a 4-digit PIN.
Tap SET AS MASTER (on the unit's WiFi). The boxes turn green.

Add users

Logged in as master, find Users List.
Type each user's mobile number and a PIN for them.
Tap SAVE USERS. Saved users turn green. Clear a number to remove that user.

Saving a user's number does not pair their phone. Each user does this once, on their own phone, standing near the unit:

Join the unit's WiFi and tap SEARCH UNIT (see section 3).
Type the 6-digit code from the unit's display. The unit shows PHONE PAIRED.
Under USERS & ACCESS, type their own number and PIN, then tap LOG IN.

Two checks keep the unit safe: the phone must be paired with the display code, and the person must know a number and PIN. A stolen PIN alone does not work on an unpaired phone.

Record of changes

The master sees the Last 25 Changes: what was changed, the date and time, whose number did it, and whether it was done near the unit (local) or through the internet. Wrong PIN tries are shown in orange.

5 wrong PINs in a row lock the unit for 5 minutes.

Forgot the master PIN?

Switch the unit off and on.
Within 1 minute, flip one of the ID switches back and forth 6 times.
The unit shows USERS RESET. Timetables are kept. Pair and set a new master.

Master reset

Hold MASTER RESET on the Device ID page for 5 seconds (master only, on the unit's WiFi). It clears the users, the internet WiFi and the paired phones, for a new owner. The timetables stay.

14If something goes wrong

What you see	What to do
"Not paired"	Hold RING 5 s, tap SEARCH UNIT and type the code shown on the unit's display.
"No unit registered"	Do the first-time setup in section 3.
Disconnected, unit light blinking	Check the phone is still on the unit's WiFi, and that the ID in the app matches the unit.
"This bell already has 3 phones"	Ask the primary phone to remove one (section 10).
Bell does not ring at the set time	Check ACTIVE shows the right timetable, today's letter is on the top line, and the clock is right. Upload again, or use Sync clock.
NEXT shows --:--	No timetable is running. Hold a timetable button for 3 s.
"… is not on the bell unit yet"	Open that timetable, UPLOAD it, then hold its button again.
CLOCK NOT SET	The clock battery was flat or removed. Use Sync clock.
RTC NOT FOUND	The clock part is not responding and bells are stopped. Call service.
CHECK POWER at start	The power dipped and the unit restarted. If it happens often, have the power supply checked.
CALL SERVICE at start	The unit found a fault and restarted itself. It keeps working; call service if you see it again.
Display is dark	Normal. It lights up again at the next bell or when the app connects.
No phone alerts when the app is closed	Allow Run in Background and Auto-launch (section 8).
PRO: display shows SRCH or PASS	SRCH: the internet WiFi is not found; check its name and signal. PASS: the password is wrong; send the WiFi again.
PRO: "Access refused"	Log in under USERS & ACCESS with your number and PIN.
Phone screen locked by itself: "Screen was auto-locked, Offline Device Lock"	Not harmful. See below.

"Screen was auto-locked" message

While your phone is on the unit's WiFi, the screen may lock by itself, and this message appears:

Security and privacy

Screen was auto-locked

Offline Device Lock detected your device was offline for a while

The message on the phone (not on the bell unit).

This is not harmful. Nothing is wrong with your phone, the app or the bell unit. Your data is safe. Just unlock the phone as usual and carry on.

Why it happens: this is an anti-theft feature of Android, made by Google. It locks the screen when the phone has had no internet for a while. The unit's WiFi has no internet, by design, so Android thinks the phone went offline. The DJ Tech app cannot lock your screen; it does not have that permission.

How to stop it:

Best: keep mobile data ON while you use the unit's WiFi. Then the phone still has internet and does not lock.
Or: open Settings → Google → All services → Theft protection and switch off Offline Device Lock. The names may differ a little on your phone's brand. This lowers your phone's theft protection, so the first way is better.