Accessory Button/Port
This article explains how the Accessory button works in the OcuTrap interface, where the physical accessory port is located, and the electrical and safety guidelines for using the accessory output.
Modifying Settings: Enable, Disable, and Adjust
Learn how to manage your settings efficiently by enabling, disabling, or altering them as needed.
To use the button, simply click it to power the accessory.
The Accessory feature allows you to remotely power an external device connected to your OcuTrap, such as a buzzer, motor, solenoid, or other low-voltage accessory. Power is switched directly by the OcuTrap and is intended for short, controlled activations.
The accessory system consists of:
A software-controlled Accessory button in the Controls menu
A physical 12V accessory port located on the OcuTrap pod
Internal switching circuitry rated for up to 3.0A continuous current
Accessory Button Behavior
The Accessory button appears in the Controls panel when the accessory port is enabled.
When the button is visible
The accessory port is enabled in Settings
The device is online and able to receive commands
When the button disappears
The accessory port is disabled in Settings
This is expected behavior and helps prevent accidental activation
If you do not see the Accessory button, check that Accessory = Enabled in the device Settings -> More Settings menu.
Physical Port Location
The accessory port is located at the top of the OcuTrap pod.
Output voltage: 12V DC
Maximum continuous current: 3.0A
Output type: Switched power controlled by OcuTrap firmware
This port is intended only for powering external accessories. It does not accept power input.
Electrical Specifications
Output Voltage
12V DC
Max Continuous Current
3.0A
Switching Method
MOSFET, low-side switched
Default State
OFF
Startup Safety
100kΩ pull-down resistor
Usage Guidelines
Polarity Sensitive
This port is not reversible.
Pin 1: Switched Ground
Pin 2: +12V Output
Always verify polarity before connecting an accessory. Incorrect wiring may damage the connected device or the OcuTrap.
Unidirectional Power Only
This port is designed exclusively to output power.
Do not:
Back-feed voltage into the port
Connect an external power supply to the accessory pins
Back-feeding power can permanently damage the internal switching MOSFET and control logic.
Load Requirements
Do not exceed 3.0A continuous current
High-current loads may cause overheating or failure
Short activation times are recommended for power-hungry accessories
If your accessory requires more current, use an external relay or driver circuit.
Inductive Loads
If you connect any inductive device, such as:
Motors
Solenoids
Relays
You must add external flyback protection.
Use a diode across the load
This protects the internal circuitry from voltage spikes during switching
Failure to add flyback protection may result in permanent damage.
Default OFF State
A built-in 100kΩ pull-down resistor ensures:
The accessory port remains OFF during boot
The port turns OFF if the control signal is lost
No accidental activation during startup or reset
Common Use Cases
External buzzers
Solenoids or latches
Low-power motors
Custom accessories using the OcuTrap accessory port
Always test new accessories with short activations before regular use.
Troubleshooting
Accessory button missing
Confirm the accessory port is enabled in Settings
Refresh the page after changing settings
Accessory does not power on
Verify wiring polarity
Confirm current draw is below 3.0A
Check that the device is online
Device resets or behaves unexpectedly
Inspect for inductive loads without flyback protection
Check for short circuits or overcurrent conditions
If you have questions about a specific accessory or need help validating your setup, contact [email protected] before deployment.
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