# FLIR LEPTON 3.5 Thermal camera with VOXL 2

Source: https://forum.modalai.com/topic/4320/flir-lepton-3-5-thermal-camera-with-voxl-2
Category: General Questions (https://forum.modalai.com/category/2/general-questions)
Posted: 2025-04-05 06:43:47 UTC by Jetson Nano
Replies: 37 · Views: 10391

## Jetson Nano · 2025-04-05 06:43:47 UTC

Hello @Alex-Kushleyev @modaltb @Eric-Katzfey 

I would like to know whether I could connect a Flir Lepton 3.5 camera to VOXL 2 board. Using the Starling 2 Image Sensor Micro-coax Front-end Adapter board [link](https://www.modalai.com/collections/image-sensors/products/m0173?variant=48528274424112).
I want to stream the video from the camera through RTSP protocol, is it possible.
[VOXL 2 - D0014 Architecture (Starling 2) ](https://docs.modalai.com/voxl2-d0014/)
here it is mentioned about the flir lepton , I would like to know whether I can stream the lepton Thermal camera data as RTSP stream from this connection.

## Reply by Jetson Nano · 2025-04-08 06:59:52 UTC

Hello @modaltb @Alex-Kushleyev @Vinny @Eric-Katzfey 
I am using ```VOXL2```, with ```m0173-1-04``` camera board, which has port for lepton thermal camera. there is no documentation available for the ```m0173-1-04 board``` , is there any pinout difference

```voxl-configure-camera is 29 ```
```Flir Lepton 3.5 ```
while I run the ```voxl-lepton-server``` command I am getting the following error. can anyone help me with the process. I tried with different configurations, but the error is the same, I2C connection issue. can anyone guide me in the right direction. 

```
voxl2:/$ voxl-lepton-server 
=================================================================
spi_bus:         0
spi_speed:       16000000
en_i2c:          1
i2c_bus:         4
shutter_mode:    auto
flow_shutter_s:  20
closePeriodInFramesInAir:         1
openPeriodInFramesInAir:          0
desiredFfcPeriodMsInAir:          360000
desiredFfcTempDeltaCentiDegInAir: 600
en_rotate:       0
=================================================================
attempting to open I2C CCI
trying address 0x2a
unable to read status reg at either lepton i2c address
failed to open I2C port 4, disabling CCI ret=-108
WARNING, FAILED TO START I2C CCI
Starting in SPI-ONLY mode
waiting for first frame from lepton to create MPA pipes
```

## Reply by Alex Kushleyev (ModalAI staff) · 2025-04-09 02:16:17 UTC (in reply to Jetson Nano)

@Jetson-Nano , I just tested this and it's working. You may have an issue with pinout, please check https://docs.modalai.com/M0173/#j6---sm08b-srss-tb

```
voxl-lepton-server 
=================================================================
spi_bus:         0
spi_speed:       16000000
en_i2c:          1
i2c_bus:         4
shutter_mode:    auto
flow_shutter_s:  20
closePeriodInFramesInAir:         1
openPeriodInFramesInAir:          0
desiredFfcPeriodMsInAir:          360000
desiredFfcTempDeltaCentiDegInAir: 600
assign_cpu_num:  7
en_timing_msg:   0
en_rotate:       0
=================================================================
thread is now locked to the following cores: 7
attempting to init the io expander
Attempting intitialization for M0188 (TCA9543A)
ERROR: in voxl_i2c_read_bytes, failed to write to bus
io_expander_init, failed to read TCA9543APWR control register
If you are not using an M0188 lepton board then this is expected
Attempting intitialization for M0187 (PI4IO)
ERROR: in voxl_i2c_read_bytes, failed to write to bus
io_expander_init, failed to read from io expander
If you are not using an M0187 lepton board then this is expected
attempting to open I2C CCI
trying address 0x2a
successfully opened I2C port
Successfully connected to I2C CCI
waiting for first frame from lepton to create MPA pipes
id number out of range, cnt: 156, 100
segment number OOB: 12
id number out of range, cnt: 98, 200
WARNING Expected segment 0, received segment 4
id number out of range, cnt: 136, 300
id number out of range, cnt: 177, 400
id number out of range, cnt: 92, 500
bad id limit reached so syncing lepton, sync_count: 2
creating MPA server pipes
enabling MPA control interface
...
(success)
```

## Reply by Jetson Nano · 2025-04-09 04:14:32 UTC (in reply to Alex Kushleyev)

@Alex-Kushleyev Thank you for reverting back. 
I am using custom Board for the Lepton, with MCBL-00105-02 cable for the connection. I will verify the pinouts.
I checked the camera with different board and it is working now.

## Reply by Jetson Nano · 2025-05-02 14:07:29 UTC (in reply to Alex Kushleyev)

Hi @Alex-Kushleyev @modaltb @Eric-Katzfey 
I still have the same error when i use my custom board. Could you verify my board pinouts.

![image (2).png](https://forum.modalai.com/assets/uploads/files/1746194770981-image-2.png)

## Reply by Jetson Nano · 2025-06-21 06:00:54 UTC (in reply to Alex Kushleyev)

@Alex-Kushleyev hey , I just had query , when i am using the [groupgets thermal breakout board](https://groupgets.com/products/purethermal-breakout-board) , the video is delay in the video feed. it is not ideal. it is a parameter error or the thermal board issue. is there any thermal camera board which will give me good and clear video stream

## Reply by Jetson Nano · 2025-06-25 13:50:03 UTC (in reply to Jetson Nano)

@Alex-Kushleyev @Eric-Katzfey @modaltb 
guys any help with solving this issue.
this the video feed I am getting.
![589968ed-ccc6-443d-a925-a6f7f0aa41f8-Screenshot from 2025-06-25 19-11-15.png](https://forum.modalai.com/assets/uploads/files/1750859374082-589968ed-ccc6-443d-a925-a6f7f0aa41f8-screenshot-from-2025-06-25-19-11-15.png)

```
voxl2:~$ voxl-lepton-server 
=================================================================
spi_bus:         0
spi_speed:       16000000
en_i2c:          1
i2c_bus:         4
shutter_mode:    manual
flow_shutter_s:  20
closePeriodInFramesInAir:         0
openPeriodInFramesInAir:          1
desiredFfcPeriodMsInAir:          360000
desiredFfcTempDeltaCentiDegInAir: 600
assign_cpu_num:  7
en_timing_msg:   0
en_rotate:       1
=================================================================
existing instance of voxl-lepton-server found, attempting to stop it
thread is now locked to the following cores: 7
attempting to init the io expander
Attempting intitialization for M0188 (TCA9543A)
ERROR: in voxl_i2c_read_bytes, failed to write to bus
io_expander_init, failed to read TCA9543APWR control register
If you are not using an M0188 lepton board then this is expected
Attempting intitialization for M0187 (PI4IO)
ERROR: in voxl_i2c_read_bytes, failed to write to bus
io_expander_init, failed to read from io expander
If you are not using an M0187 lepton board then this is expected
attempting to open I2C CCI
trying address 0x2a
successfully opened I2C port
Successfully connected to I2C CCI
waiting for first frame from lepton to create MPA pipes
creating MPA server pipes
enabling MPA control interface
client "voxl-portal78592109" connected to channel 0  with client id 0
client "voxl-portal64940239" connected to channel 1  with client id 0

```

## Reply by Alex Kushleyev (ModalAI staff) · 2025-07-01 04:54:25 UTC (in reply to Jetson Nano)

@Jetson-Nano , this looks like a sensor issue. VOXL2 does not do any configuration of the sensor's parameters, other than it can change the calibration interval based on config file, I believe.

What you are seeing appears to be artifacts in the sensor itself, maybe due to noise on power rail(s). This is not an expected behavior, but it should not be caused by a SW configuration from the VOXL2 side.

Alex

## Reply by Jetson Nano · 2025-07-01 13:41:13 UTC (in reply to Alex Kushleyev)

@Alex-Kushleyev  @Vinny @Eric-Katzfey @modaltb 

I am currently in the process of designing a custom thermal breakout board intended for integration with the M0173 Coax Board.

As part of this configuration, I have already had the board manufactured. However, during testing, I observed that the VOXL2 Board is not recognizing the camera, and it throws the error message pinned at the top of this thread.

To ensure the design is moving in the right direction, I would like to request your feedback on the following:

-Whether the overall design approach is technically sound and compatible with the M0173 and VOXL2 systems.
-If there are any missing components or critical connections that may be causing communication or recognition issues.

I would greatly appreciate your time and expertise in reviewing the attached schematic of my breakout board.

![b6abd1e0-53ed-4230-93d8-d8f71437d594-image.png](https://forum.modalai.com/assets/uploads/files/1751376922987-b6abd1e0-53ed-4230-93d8-d8f71437d594-image.png) 

Thanks.

## Reply by Vinny (ModalAI staff) · 2025-07-01 14:23:30 UTC (in reply to Jetson Nano)

Hi @Jetson-Nano 
I do not see anything obviously wrong with your design, so we may be dealing with nuances that even we had to update our design for.
1) FLIR suggest to connect MOSI (pin 11) to GND, per page 45 of their spec

2a) There is a chance you have too much capacitance on the 2.8V rail. Our PMICs have limitations on the inrush specs and a 4.7uF I think puts that limit over the suggested amount by Qualcomm. I suggest lowering that to 2.2uF (what we use on our LDO) or even better 1uF. The 1.2V rail per specs (that I have which are a few years old) suggest the 1.2V rail only needs ~110mA
2b) We use a small LDO, not a DC/DC. Not sure if the Lepton is happy with the noise of a DC/DC compared to an LDO and having issues or not. For reference we use a 500mA LDO from TI (TPS7A11xx family)
2c) in relation to 2a above, what are the values of C3 and C2? If they are large (>=4.7uF) I suggest try lowering them to 2.2uF or 1uF's.

3) For reset, this is where we found the biggest issue with the Leptons. We actually have a I2C GPIO expander on our design to issue SW controlled resets of the Lepton. It is not the most stable sensor and frequent resets are required for good operation. Here is our circuit if you want to try it yourself: ![12577500-c2f8-4b82-8fda-b409be323a48-image.png](https://forum.modalai.com/assets/uploads/files/1751379232921-12577500-c2f8-4b82-8fda-b409be323a48-image.png) 

For debugging your exact setup, one thing we do is validate if we hear the shutter click (or see the micro actuator move) on power up. Does your HW give that noticeable clicking when you try to power on? If not, you have a more serious issue such as a wrong PCB symbol or incorrect assembly.
Hope that helped.

Last resort, just use our M0187 design that we have for this. I'm not seeing it online for sale, but I can inquire with the team if we plan to make that available for individual use (it is embedded in Starling 2's now).

## Reply by Alex Kushleyev (ModalAI staff) · 2025-07-01 14:27:47 UTC (in reply to Vinny)

I also double checked the schematic and did not notice anything wrong. Please follow Vinny’s suggestions :) and definitely check if the Lepton is making the clicking sound, which would mean it is powered on, it should be clicking periodically in default mode after power on.

## Reply by Jetson Nano · 2025-07-02 13:06:10 UTC (in reply to Vinny)

@Vinny @Alex-Kushleyev 
Thank you for your invaluable feedback on the previous design. I have thoroughly reviewed your input and subsequently updated the schematic to incorporate the suggestions, specifically regarding the integration of an I2C GPIO expander. The updated schematic is attached for your review.

During recent debugging, I observed a critical issue: the Lepton module is not powering up, and no shutter sound is audible. This suggests a fundamental problem with power delivery or clocking to the module, which is currently preventing any functionality.

Concurrent to addressing this critical power-up issue, I would appreciate your expert insights on a few points concerning the updated design of the I2C GPIO expander and Lepton module interfacing:

- I2C Bus Configuration: Regarding the I2C bus, should the I2C lines be connected in parallel to both the Lepton Module and the I2C GPIO expander?

- Lepton Reset/Power Down Pins: Concerning the Lepton Module's RESET_N and POWER_DOWN_N pins, should the existing resistor-capacitor (RC) network connected to the RESET_N pin be retained, or can it be omitted?

- I2C GPIO Expander INT Pin: For the I2C GPIO expander, is it permissible to leave the INT (Interrupt) pin unconnected, or does it require termination?

- I2C GPIO Expander Software Configuration: From a software perspective, is the I2C GPIO expander a plug-and-play component, or does it require specific configuration?

Your guidance on both the immediate power-up challenge and the schematic queries would be greatly appreciated.

![20fb34b6-34cc-4290-8509-fde084557724-image.png](https://forum.modalai.com/assets/uploads/files/1751461395863-20fb34b6-34cc-4290-8509-fde084557724-image.png) 

Thanks.

## Reply by Vinny (ModalAI staff) · 2025-07-02 17:04:41 UTC (in reply to Jetson Nano)

Hi @Jetson-Nano 
Happy to continue helping.
Regarding your updated design first:

---------------------------------------

"I2C Bus Configuration: Regarding the I2C bus, should the I2C lines be connected in parallel to both the Lepton Module and the I2C GPIO expander?"

-- Yes.

"Lepton Reset/Power Down Pins: Concerning the Lepton Module's RESET_N and POWER_DOWN_N pins, should the existing resistor-capacitor (RC) network connected to the RESET_N pin be retained, or can it be omitted?"
 
-- We do not have any RC delay on the reset line since it is all GPIO controlled.

"I2C GPIO Expander INT Pin: For the I2C GPIO expander, is it permissible to leave the INT (Interrupt) pin unconnected, or does it require termination?"

-- It is an output and we do not use it, so N.C. is fine

I2C GPIO Expander Software Configuration: From a software perspective, is the I2C GPIO expander a plug-and-play component, or does it require specific configuration?

-- It is supported at that HW address by default with voxl-lepton-server (I think that it what is called, Alex can correct me if I'm mistaken)

However, your updated SCH has a couple errors:

- Your LDO input and output caps are not correctly done. They are in series, not shunts to GND as required:![0f7551cf-b798-4665-9673-a4df6182c21b-image.png](https://forum.modalai.com/assets/uploads/files/1751475507720-0f7551cf-b798-4665-9673-a4df6182c21b-image.png) 

- The Pull-down R on the GPIO expander is not correct. The ADDR pin will always be HIGH due to the direct connection to 2.8V, but our default is LOW (see the snippet from above): ![f6ee80a1-e5fa-4635-b3dd-93c5ca85e501-image.png](https://forum.modalai.com/assets/uploads/files/1751475568152-f6ee80a1-e5fa-4635-b3dd-93c5ca85e501-image.png) 

- Also, the GPIO expander is meant to drive the RESET input of the Lepton, not the PWR_DWN input: ![eb4012fd-2528-4879-a1f6-d235568faa6e-image.png](https://forum.modalai.com/assets/uploads/files/1751475657284-eb4012fd-2528-4879-a1f6-d235568faa6e-image.png) 

Now, as to your existing board not powering on, I have a clue for you...
Our very first lepton board we failed to notice the pin 1 hole in the Molex socket, and that is important since it sets a keying for the Lepton module. If the module is inserted incorrectly (90 or 180 off) it will clearly not power up. Pay close attention to the hole in the socket for pin 1 and two vs one slots in the socket which set the orientation.
![cc6af474-a14c-48b3-9d96-9310df3480ab-image.png](https://forum.modalai.com/assets/uploads/files/1751475810064-cc6af474-a14c-48b3-9d96-9310df3480ab-image.png) 
![679c78bb-4741-4674-9c33-277355fde4c9-image.png](https://forum.modalai.com/assets/uploads/files/1751475861867-679c78bb-4741-4674-9c33-277355fde4c9-image.png) 

Keep us posted and hope this helped.

## Reply by Jetson Nano · 2025-07-03 14:46:50 UTC (in reply to Vinny)

@Vinny @Alex-Kushleyev 

Thank you for your valuable feedback on the previous version of the schematic. Based on your recommendations, I have revised the design accordingly.

Please find the updated schematic attached below for your review

![8b63651c-f927-48fd-9c33-16adf04c65ed-image.png](https://forum.modalai.com/assets/uploads/files/1751553980774-8b63651c-f927-48fd-9c33-16adf04c65ed-image.png) 

In addition to the design changes, I have also revisited the hardware setup to verify the power delivery, the Lepton module is still not powering up—there is no shutter sound or I²C response. At this point, I have exhausted the immediate troubleshooting steps and would greatly appreciate your guidance on further debugging strategies.

Could you please review the updated schematic and suggest any additional tests or possible points of failure that may have been overlooked?

Thank you again for your support and expertise.

## Reply by Vinny (ModalAI staff) · 2025-07-03 16:36:37 UTC (in reply to Jetson Nano)

Hi @Jetson-Nano 
Sch updates look correct. I'd still add a pull-up on the Lepton Reset to help control it during initial power-ON before the IO expander is configured.

To help further debug your existing setup, I'd need more tangible info such as pictures with all your cables, etc. Do you have a DMM handy showing the voltages of 1.2V and 2.8V, and an O-scope for the 25MHz?
Can you also post a pic of your board without components installed (so I can review the layout as best as possible)?
It's hard to give much further guidance without actual hardware in my hands.
Thanks!

## Reply by jared · 2025-07-11 18:01:32 UTC (in reply to Jetson Nano)

@Jetson-Nano did you ever figure out a solution to this? I'm getting similar imagery. Is this an FFC issue? Running the same breakout board on a raspberry pi produces completely normal imagery.

## Reply by KLindgren · 2025-07-16 17:38:32 UTC (in reply to jared)

To close the loop here: we solved our issue of seeing lines by providing power to the lepton via one of the 3.3V pins on the voxl2 mini instead of relying on the power pin of [J10 on the sparrow board](https://docs.modalai.com/M0188/#lepton-2---j5-external-spi-to-m0104-j10).

## Reply by Vinny (ModalAI staff) · 2025-07-16 18:00:02 UTC (in reply to KLindgren)

Hi @KLindgren 
You raise a concern and something I will run by the team, but if you are powering the M0187 at 3.3V directly, you are violating the FLIR specs for the Lepton and our system design constraints.

![5ffb65bb-b699-4528-91b2-ccf9f9ddcc4d-image.png](https://forum.modalai.com/assets/uploads/files/1752688661898-5ffb65bb-b699-4528-91b2-ccf9f9ddcc4d-image.png) 

How are you connecting M0187 to M0188? Maybe your cable is introducing some extra losses giving you a lower than 2.8V supply?

## Reply by KLindgren · 2025-07-16 18:12:03 UTC (in reply to Vinny)

@Vinny apologies, I should have clarified we're using [this PureThermal breakout board](https://groupgets.com/products/purethermal-breakout-board) which regulates VIN from 3.3-5V

## Reply by Vinny (ModalAI staff) · 2025-07-16 18:57:54 UTC (in reply to KLindgren)

@KLindgren 
OK, M0188 will not work with anything other than our M0187.
Thanks for clarifying.

## Reply by jared · 2025-07-16 19:02:31 UTC (in reply to Vinny)

@Vinny said in [FLIR LEPTON 3\.5 Thermal camera with VOXL 2](/post/23130):
> M0187

Hi @Vinny - I'm guessing the M0187 is your FLIR breakout board? Do you sell these?

## Reply by Vinny (ModalAI staff) · 2025-07-16 19:08:24 UTC (in reply to jared)

Hi @jared 
Presently they are integrated within certain drones...
https://docs.modalai.com/stinger-vision-datasheet/

I can poke the team to see if we can get it listed separately in the near future.

## Reply by Jetson Nano · 2025-07-17 05:20:00 UTC (in reply to KLindgren)

@KLindgren I am also using the same board but my video stream is with high disturbances, i have posted a image above in the chat. could you please share the image from your camera so that i could figure out what is wrong with my setup. Also the details of your setup, it would be of great help.

## Reply by KLindgren · 2025-07-17 13:53:04 UTC (in reply to Jetson Nano)

@Jetson-Nano our images looked the same as yours when providing power to the PureThermal from the sparrow board (m0188) but using a 3.3V from the voxl2 mini fixed the issue and gives us this imagery. 
![94767b82-68c1-4a72-b830-64c29fc4d33e-image.png](https://forum.modalai.com/assets/uploads/files/1752759945268-94767b82-68c1-4a72-b830-64c29fc4d33e-image.png) 

We are using power from the voxl2 mini's J19 and currently working on running 2 leptons with an RGB using the sparrow board.
![fdd0c8b1-0a2d-4496-b7a9-f5ab409f603f-image.png](https://forum.modalai.com/assets/uploads/files/1752760298508-fdd0c8b1-0a2d-4496-b7a9-f5ab409f603f-image.png)

## Reply by Jetson Nano · 2025-07-17 14:44:34 UTC (in reply to KLindgren)

@KLindgren thank you for reverting back. From which port are you taking the 3.3 V also how did you complete the circuit, the image you provide is confusing with respect to the connections, it would be great if you would provide further details.

## Reply by jared · 2025-07-17 18:47:13 UTC (in reply to Vinny)

Thanks @Vinny

## Reply by KLindgren · 2025-07-18 12:51:08 UTC (in reply to Jetson Nano)

@Jetson-Nano Our 2 Leptons are connected as described in [this image](https://docs.modalai.com/M0188/#flir-lepton-interfaces) - though we're using [PureThermal boards](https://groupgets.com/products/purethermal-breakout-board) instead of M0187s for the Leptons. The 3.3V VIN is provided from the VOXL's J19 port via [this cable](https://www.modalai.com/collections/cables-1/products/mcbl-00089) and a "Y" split jumper we've soldered together.

## Reply by Jetson Nano · 2025-07-31 14:13:34 UTC (in reply to Vinny)

Hi @Vinny, @Alex-Kushleyev,

Thank you once again for your valuable feedback on the schematics, and apologies for the delayed response.

I’ve now completed the PCB layout based on the updated schematics and newly selected components, as per your suggestions. I would greatly appreciate it if you could take a moment to review the layout and share your feedback—particularly on whether it meets the required configuration or if any modifications are recommended.

The following have been included in the shared Drive link:

Screenshots of all four layers

3D views of both the top and bottom sides of the board

🔗 Drive link: https://drive.google.com/file/d/1czCx-N8ws3CelpKTV1VRBTzFZLcd-odx/view?usp=drive_link

Looking forward to your insights.

Thank you again for your continued support and guidance.

## Reply by Vinny (ModalAI staff) · 2025-08-04 15:03:49 UTC (in reply to Jetson Nano)

Hi @Jetson-Nano 
I've been on vacation and just catching up. It will be a few days before I can get to this.
Thanks for your patience.

## Reply by Vinny (ModalAI staff) · 2025-08-04 18:36:55 UTC (in reply to Jetson Nano)

Hi @Jetson-Nano 
I do not have access to the link you have above.
Please reach out to us using the contact form https://www.modalai.com/pages/contact-us and we can get a more detailed review scheduled using your native cad tools which is more effective for us.

Just mention in the form you wish to reach Vinny and then in the response from our team, you can reply with your data and they will forward it to me.
Thanks!

## Reply by Jetson Nano · 2025-08-05 05:14:03 UTC (in reply to Vinny)

@Vinny

Thank you for the update — I hope you had a great vacation!

As you mentioned, I’ve submitted an inquiry through your contact form. Once I receive a response from your team, I’ll follow up with the necessary details and additional data as needed.

Thank you for your continued support.

## Reply by Vinny (ModalAI staff) · 2025-08-11 23:06:52 UTC (in reply to Jetson Nano)

Hi @Jetson-Nano 
I received your data package and will review it this evening.
Thanks!
Vinny

## Reply by Vinny (ModalAI staff) · 2025-08-12 05:37:55 UTC (in reply to Vinny)

Hi @Jetson-Nano I have reviewed your schematic again and your layout files.
I cannot see any reason why your design will not work.
The only suggestion I have is to increase your capacitors here to 1uF:
![772656ba-107d-4f9a-9b53-37b133cb8727-image.png](https://forum.modalai.com/assets/uploads/files/1754976127482-772656ba-107d-4f9a-9b53-37b133cb8727-image.png) 

But, otherwise, your layout is OK (some improvements can be made, but nothing is detrimental):
- Pin 1 correct on connector, socket, LDO, other ICs
- Vias are picking up planes correctly
- Voids where expected
- Generous copper trace thickness

The one issue I think I might have found is your reference designators do not match the schematic between the layout. So, I'm wondering if you are installing parts from the BOM in incorrect locations...
For example, the cap on the output of the LDO is "C6" in the layout, but "C7" in your schematic:

![0ceb0cb0-3dd8-4b0a-9041-3156136b3acf-image.png](https://forum.modalai.com/assets/uploads/files/1754976540897-0ceb0cb0-3dd8-4b0a-9041-3156136b3acf-image.png) 
And, your resistors are also not in sync. R1 and R2 in the layout are for the Ic2 expander, but in the SCH, it is for your FLIR module and not R5/R6 as in the SCH:
![d134c0be-7357-49a8-9c9e-e17af872904e-image.png](https://forum.modalai.com/assets/uploads/files/1754976712948-d134c0be-7357-49a8-9c9e-e17af872904e-image.png) 
and there are a few other examples. So, I just think perhaps your layout reference designators are not synced to your design.

J1 should be J2, and R3/R4 on the layout does not exist on the SCH.
![effa846f-e382-4f07-b89c-f8f118258643-image.png](https://forum.modalai.com/assets/uploads/files/1754976940362-effa846f-e382-4f07-b89c-f8f118258643-image.png) 

So, maybe this is where your issue is. I'd recheck the annotation between SCH and Layout, and be sure you are installing all the correct parts in the correct places.

Hope this helped!
Keep us posted.
Thanks!

## Reply by Jetson Nano · 2025-08-12 06:12:02 UTC (in reply to Vinny)

Hello @Vinny, 

Hi Vinny,

Thank you again for your valuable feedback on the schematics and layout.

Apologies for not sending the updated files — the issues you pointed out were caused by that omission. I have now incorporated your suggestions and attached the updated schematics for your reference. I will also update the capacitor values to 1 µF as discussed.

Could you please review the attached schematics and let me know if any further changes are required?

Thanks very much for your continued support.

![cf16b4e9-15e0-47c7-804c-8e1e90e82f08-image.png](https://forum.modalai.com/assets/uploads/files/1754978947957-cf16b4e9-15e0-47c7-804c-8e1e90e82f08-image.png)

## Reply by Vinny (ModalAI staff) · 2025-08-12 06:20:28 UTC (in reply to Jetson Nano)

HI @Jetson-Nano 
Your welcome. Apologies I cannot find anything blatantly wrong with your design at the document and layout level.
If your PCB still does not work after all these reviews and positive affirmations, then you may very well have a fabrication issue with your PCB.
The only way to verify that is to try your own net-by-net buzz-out using a DMM to ensure your netlist matches the expected schematic. If that all matches up, then you may be suffering from poor assembly/soldering. The socket for the lepton does require a reflow oven/line and cannot be hand soldered, unless you have an IR tray/heater and a way to deposit solder paste on the pads.

Any further debugging I could offer would require physical samples of the hardware to validate everything.

Hope that info helps!

## Reply by Jetson Nano · 2025-08-12 06:26:00 UTC (in reply to Vinny)

@Vinny 

Thank you so much for your feedback — it’s very valuable to us. I will definitely review and address the suggestions you have mentioned. 

Thank you for your continued support.

## Reply by Jetson Nano · 2025-09-15 16:08:50 UTC (in reply to Vinny)

Hello @Vinny, @Alex-Kushleyev,

I am pleased to inform you that we have successfully manufactured the board and tested it today.

Everything worked as expected, and we were able to get the feed.

I sincerely thank you for your support and guidance throughout this process.

Thank you for your continued support.

## Reply by Vinny (ModalAI staff) · 2025-09-15 16:11:13 UTC (in reply to Jetson Nano)

@Jetson-Nano 
YES!!! So happy to hear that.