Hi Support Team, We are working on synchronizing an external PP820 light controller with an OAK4-S R9 camera. We connected the dedicated `STROBE_5V` output on M8 Pin 2 to an oscilloscope. The strobe pulse is present and appears to be synchronized with the camera exposure. However, when we connect this output to the trigger input of the PP820 light controller, it does not activate the light. The optocoupler currently being used is: MIRO TR 24VDC SK OPTO-COUPLER MODULE IN: 53 VDC - OUT: 48 VDC / 0,5 A Model 52500 Our intended sequence is: 1. The host PC sends a software trigger to the OAK4-S. 2. The camera starts exposure. 3. The camera generates a strobe output during the exposure period. 4. The strobe signal activates our PP820 light controller through an optocoupler. 5. The light switches off when the exposure is completed. 6. The captured image is transferred to the host PC. Could you please clarify the following? 1. What are the voltage level and maximum output current of the `STROBE_5V` pin? 2. Is Pin 2 a 5 V push-pull output, open-drain output, or another output type? 3. Can this pin directly drive the trigger input of an external light controller? 4. Is an external optocoupler, transistor, MOSFET, relay, or signal-buffer circuit required? 5. Is a pull-up or pull-down resistor required for the strobe output? 6. What is the recommended wiring method, including the required common ground? 7. Can you provide a recommended interface circuit for connecting the strobe output to an industrial light controller? 8. Is it possible to configure the strobe polarity, delay and pulse duration? 9. Could you provide a working DepthAI example for software-triggered capture with an exposure-synchronized strobe? The camera is currently running RVC4 OS version 1.37.0. We can share the oscilloscope waveform, PP820 trigger-input specifications and our current wiring diagram if required.

Hi Oskar, Thank you for your response. We replaced the MIRO 52500 with a 5 V-compatible optocoupler: **Murrelektronik AMMS 10-1** **Article number:** 50010 **Input:** 4–30 VDC, 10 mA **Output:** 4–44 VDC, up to 0.5 A However, we are still unable to trigger the PP820 light controller. We measured the `STROBE_5V` signal using an oscilloscope and observed the following: * Peak-to-peak voltage: approximately 4.10 V * Pulse-high voltage: approximately 3.83 V * Pulse width: approximately 200 µs * Frequency: approximately 30.1 Hz We have attached photos of the oscilloscope measurement, optocoupler and wiring. Since the optocoupler requires a minimum input voltage of 4 V and an input current of 10 mA, the measured 3.83 V may not be sufficient to switch it reliably. The 200 µs pulse duration may also be too short for the light-controller input. Could you please confirm: 1. What is the maximum source/sink current of the `STROBE_5V` output? 2. Is this output capable of driving a 10 mA optocoupler input? 3. Is the measured pulse-high voltage of approximately 3.83 V expected? 4. Is the 200 µs strobe pulse width expected, and can it be configured or extended? 5. Could you recommend a tested opto-isolator, buffer circuit or level converter compatible with this output? 6. Could you provide the recommended wiring, polarity and grounding arrangement? [upl-image-preview uuid=a32b1ffa-9eba-48d5-97e1-d9e73e3834c3 url=https://discuss.luxonis.com/assets/files/2026-09-07/1788786346-845147-whatsapp-image-2026-09-07-at-50948-pm.jpg alt={TEXT?}] [upl-image-preview uuid=423df685-8885-4504-9d43-76b6ab027d44 url=https://discuss.luxonis.com/assets/files/2026-09-07/1788786346-905239-whatsapp-image-2026-09-07-at-50949-pm-1.jpg alt={TEXT?}] [upl-image-preview uuid=e2f6574f-5506-4ae5-a921-03bf9b49dfbb url=https://discuss.luxonis.com/assets/files/2026-09-07/1788786346-962704-whatsapp-image-2026-09-07-at-50949-pm.jpg alt={TEXT?}]

OAK4-S Strobe Output Cannot Trigger PP820 Light Controller

SubashDas

Hi Support Team,

We are working on synchronizing an external PP820 light controller with an OAK4-S R9 camera.

We connected the dedicated STROBE_5V output on M8 Pin 2 to an oscilloscope. The strobe pulse is present and appears to be synchronized with the camera exposure. However, when we connect this output to the trigger input of the PP820 light controller, it does not activate the light.

The optocoupler currently being used is:

MIRO TR 24VDC SK OPTO-COUPLER MODULE
IN: 53 VDC - OUT: 48 VDC / 0,5 A Model 52500

Our intended sequence is:

The host PC sends a software trigger to the OAK4-S.
The camera starts exposure.
The camera generates a strobe output during the exposure period.
The strobe signal activates our PP820 light controller through an optocoupler.
The light switches off when the exposure is completed.
The captured image is transferred to the host PC.

Could you please clarify the following?

What are the voltage level and maximum output current of the STROBE_5V pin?
Is Pin 2 a 5 V push-pull output, open-drain output, or another output type?
Can this pin directly drive the trigger input of an external light controller?
Is an external optocoupler, transistor, MOSFET, relay, or signal-buffer circuit required?
Is a pull-up or pull-down resistor required for the strobe output?
What is the recommended wiring method, including the required common ground?
Can you provide a recommended interface circuit for connecting the strobe output to an industrial light controller?
Is it possible to configure the strobe polarity, delay and pulse duration?
Could you provide a working DepthAI example for software-triggered capture with an exposure-synchronized strobe?

The camera is currently running RVC4 OS version 1.37.0. We can share the oscilloscope waveform, PP820 trigger-input specifications and our current wiring diagram if required.

Oskar-Luxonis

Hey SubashDas - the OAK4-S strobe works. The MIRO 52500 does not: it needs at least 10 V input afaik, but STROBE_5V is 5 V logic.

Please use a 5 V-input-compatible opto-isolator or buffer instead. Do not connect the OAK4-S directly to the PP820 until we confirm the strobe-output current limit.

Thanks,
Oskar

SubashDas

Hi Oskar,

Thank you for your response.

We replaced the MIRO 52500 with a 5 V-compatible optocoupler:

Murrelektronik AMMS 10-1
Article number: 50010
Input: 4–30 VDC, 10 mA
Output: 4–44 VDC, up to 0.5 A

However, we are still unable to trigger the PP820 light controller.

We measured the STROBE_5V signal using an oscilloscope and observed the following:

Peak-to-peak voltage: approximately 4.10 V
Pulse-high voltage: approximately 3.83 V
Pulse width: approximately 200 µs
Frequency: approximately 30.1 Hz

We have attached photos of the oscilloscope measurement, optocoupler and wiring.

Since the optocoupler requires a minimum input voltage of 4 V and an input current of 10 mA, the measured 3.83 V may not be sufficient to switch it reliably. The 200 µs pulse duration may also be too short for the light-controller input.

Could you please confirm:

What is the maximum source/sink current of the STROBE_5V output?
Is this output capable of driving a 10 mA optocoupler input?
Is the measured pulse-high voltage of approximately 3.83 V expected?
Is the 200 µs strobe pulse width expected, and can it be configured or extended?
Could you recommend a tested opto-isolator, buffer circuit or level converter compatible with this output?
Could you provide the recommended wiring, polarity and grounding arrangement?

jakaskerl

SubashDas
Strobe should connect to a high-impedance buffer input so it does not load down the signal. The buffer will then provide a low imp output capable of supplying the current needed by the optocoupler.

Thanks,
Jaka