Four changeover relays
Each output provides COM, normally-open and normally-closed contacts. Relay contacts are rated 10 A at 250 V AC, 125 V AC or 30 V DC; inductive and high-inrush loads may require suitable external control gear or suppression.
British-made haunted attraction automation
Build the scare. Control the chaos.
The Scream Tek ST-R4 is a British-made four-channel haunt and effect controller with four dry-contact inputs, four relay outputs and a powerful mobile web interface hosted by the controller itself. Firmware v1.3 adds live relay recording and a reusable pattern library. It is made and stocked in the UK, with international shipping available. No router, internet connection or app-store download required.
Made & stocked in the UKNew: record mode in firmware v1.3International shipping available
- 4COM / NO / NC relays
- 4dry-contact inputs
- 8reusable patterns
ST-R4
SYSTEM READY
INPUTS
1234
192.168.4.1
RELAYS
R1R2R3R4
No router or internet required
Program from any modern phone browser
British-madeMade and stocked in the United Kingdom
UK stockDispatched from the UK
International shippingAvailable for customers outside the UK
No routerCreates its own ST-R4 Wi-Fi network
Introducing
The Scream Tek ST-R4
A British-made, compact 4-channel controller designed for props, scare rooms and temporary haunted-attraction installations. Units are made and stocked in the UK, with international shipping available. Use the four changeover relay outputs to interface with lights, fog machines, solenoids, motors through suitable control gear and other effects within the published contact ratings.
Connect sensors, pressure mats, buttons, PIR interfaces or other dry contacts to the four inputs. Then join the controller’s own Wi-Fi hotspot to create fixed pulses, advanced multi-step sequences, independent timed events or record a live relay timeline by pressing the outputs exactly when you want them to operate.
Buy the ST-R4
Secure online checkout with tracked UK and international delivery through the Scream Tek store.
Installer-friendly by design
No router. No app. Just control.
The ST-R4 hosts its own mobile-friendly control panel. Join the device network, open a browser and configure the effect exactly where it is installed.
Four dry-contact inputs
Connect sensors, mats, buttons or compatible PIR interfaces. Inputs operate to GND and are active-low by default, with polarity, edge and debounce settings available.
Device-hosted Wi-Fi
The controller creates an ST-R4-XXXX hotspot. Connect directly and open 192.168.4.1 — no internet, venue Wi-Fi or installed app required.
Manual fire and live status
Test each relay from your phone and see input states, active outputs, running sequences and cooldowns in real time.
Hide and wake Wi-Fi
Start the hotspot on boot or keep it off until needed. Hide the network after setup, then use the physical wake button when you need to make changes.
British-made and UK stocked
The ST-R4 is made and stocked in the United Kingdom, with international shipping available for attractions and installers overseas.
Record the effect live
Hold record and press relay controls in real time. The relays follow your presses while the ST-R4 captures the exact on/off timeline for later playback.
Reusable pattern library
Firmware v1.3 stores up to eight named patterns. Record once, then assign the same pattern to any simple trigger with per-trigger loop settings.
Four ways to run an effect
From one-shot triggers to recorded scare choreography.
Program everything in the ST-R4 web interface. Changes are stored on the controller and the effects continue to operate when the Wi-Fi hotspot is hidden.
Input in. Effect out.
Assign one input to pulse one or more relays. Set the relay on-time, cooldown, trigger polarity, edge behaviour and input debounce.
- One input controls one or more outputs
- Adjustable on-time and cooldown
- Fixed pulse or recorded-pattern playback
Perform it once. Replay it perfectly.
Press relay controls live while the controller records every on/off change. Save the result as a named pattern and assign it to any simple trigger.
- Live multi-relay on/off timeline
- Low-latency WebSocket recording controls
- Play once, a chosen number of times or forever
- Optional playback on startup
Build the whole scare.
Create multi-step sequences with up to ten steps each. Switch relays, wait for a period or hold until another input changes.
- Relay-on and wait steps
- Timer or input-ended steps with optional timeout
- Ignore or restart when retriggered
- Separate restart and end cooldowns
Keep the atmosphere alive.
Run delayed one-shot events or repeating intervals without needing a sensor input — useful for ambient lighting, movement and background effects.
- Delayed one-shot actions
- Repeating intervals
- Up to eight independent events
Current firmware · v1.3
Record the timing live. Use it again anywhere.
Some effects are easier to perform than to describe as a list of delays. Record mode lets an installer operate the relays from the phone interface while the ST-R4 captures the live timeline. The saved pattern can then be played automatically whenever an input is triggered.
No code. No timeline editor. Press, record and replay.
v1.2Live record and playback
- Relays follow your on-screen presses while recording
- Playback a recording instead of a fixed simple-trigger pulse
- Loop a chosen number of times, or continuously with a value of 0
- Optionally start an assigned pattern automatically at boot
- WebSocket press/release path for responsive recording
v1.3Named pattern library
- Store up to eight named patterns on the controller
- Record once and assign the pattern to any simple trigger
- Dedicated record modal with a clear ON/OFF indicator
- Loop-forever checkbox and plays-per-trigger control
- Existing pulse, sequence and timed-event modes remain available
The v1.0 foundation is still included:
pulse simple triggersadvanced sequencestimed eventsSoftAP hide / wakeGPIO conflict warningsScream Tek web UI
From box to boo
Program it in four quick steps.
- 1
Power and wire
Choose the correct dedicated screw-terminal power input: 5 V DC, 7–30 V DC or 220 V AC. Then connect the relay contacts and dry-contact inputs in accordance with the wiring guide and load ratings. Mains connections must be enclosed and completed by a competent person.
- 2
Join ST-R4-XXXX
Wake the hotspot if required and connect your phone, tablet or laptop directly to the controller’s own Wi-Fi network.
- 3
Open 192.168.4.1
Use the mobile-friendly web UI to manually test outputs, view live status, build simple triggers, record reusable relay patterns, create advanced sequences or schedule timed events.
- 4
Test, save and hide
Confirm every movement and safety measure, save the configuration, then hide the Wi-Fi network for the show. The effects continue running locally.
One box. Plenty of trouble.
Built for real haunt installations.
01
Pneumatic props
Fire compatible solenoid control circuits for pop-ups, drop panels, air cannons and sudden movements.
02
Scare-room sequences
Coordinate lighting, fog and movement across a multi-stage scene with input-ended or timed steps.
03
Actor and guest triggers
Use push buttons, pressure mats, sensors or PIR interfaces to start repeatable effects at exactly the right moment.
04
Ambient cycles
Use timed events or a recorded pattern set to loop forever for repeating background movement, lighting or scenic effects.
!
Control is not safety
Keep emergency stops, guarding and safety interlocks independent.
The ST-R4 should operate attraction effects only within its published electrical ratings. Mains terminals must be installed in a suitable enclosure and wired by a competent person. The controller must not replace safety-rated controls, emergency stops, mechanical restraints or a competent risk assessment.
Questions from the workshop
ST-R4 FAQ.
Key details about setup, triggering and installation.
Does the ST-R4 need a router or internet connection?
No. It creates its own Wi-Fi network, normally named ST-R4-XXXX. Join that network directly and open 192.168.4.1 in a browser.
Do I need to install an app?
No. The controller serves a mobile-friendly web interface, so setup works in a modern browser on a phone, tablet or laptop.
What can a trigger do?
A simple trigger can pulse one or more relays for a fixed time or play a recorded pattern from the library. An advanced trigger can run a sequence of up to ten relay-on or wait steps.
How does record mode work?
Open the record modal and operate the relay buttons from your phone. The physical relays follow your presses while the ST-R4 captures each on/off change. Save the result as a named pattern and assign it to a simple trigger.
How many recorded patterns can I save?
Firmware v1.3 stores up to eight named patterns. A saved pattern can be assigned to any of the four simple triggers, so the same recording can be reused without recording it again.
Can a recording repeat?
Yes. Choose a number of plays for each trigger, select loop forever, or configure an assigned pattern to begin automatically at startup.
Can a sequence wait for another sensor?
Yes. An advanced step can end after a timer or when an input changes, with an optional timeout so the sequence cannot wait indefinitely.
Can the Wi-Fi be turned off during a show?
Yes. The hotspot can hide automatically after a timeout or immediately from the web UI. Effects keep running, and the physical wake button brings Wi-Fi back when required.
Are settings retained after power is removed?
Yes. The controller stores its configuration on-board so trigger, sequence, timer and Wi-Fi settings survive reboot.
Does the ST-R4 play audio?
No. Firmware v1.3 controls four inputs and four relay outputs, including recorded relay patterns, but it does not include onboard audio playback.
What power supplies can I use?
The ST-R4 provides dedicated screw-terminal power connections for 5 V DC, 7–30 V DC and 220 V AC. Use only the appropriate input, follow the wiring guide, and have mains wiring enclosed and completed by a competent person.
What are the relay contact ratings?
Each changeover relay is rated 10 A at 250 V AC, 125 V AC or 30 V DC. These are contact ratings, not a guarantee that every 10 A load is suitable. Motors, solenoids, transformers, fog machines and other inductive or high-inrush loads may need external contactors, suppression or derating.
Is the ST-R4 made in Britain?
Yes. The ST-R4 is a British product made and stocked in the United Kingdom.
Do you ship outside the UK?
Yes. UK delivery is available and international shipping can be arranged. Customers are responsible for checking local electrical requirements, import charges and product suitability.
Can the relays directly switch any equipment?
No. Use only loads within the published relay voltage and current ratings. High-power, mains or strongly inductive equipment may require suitable external contactors, motor starters, snubbers or other correctly rated control gear.
Bring your next scare to life
Ask about the ST-R4.
Tell us about your prop, inputs and loads. This form sends your enquiry directly to Scream Tek without opening a separate email application.
British-made and stocked in the UK
UK and international shipping enquiries
Haunt installer and OEM discussions
Firmware v1.3 and record-mode questions