PCB - Electrical - Forum https://theopenexo.nau.edu/community/pcb-electrical/ Discussion Board en-US Mon, 06 Apr 2026 01:47:11 +0000 wpForo 60 Feedback regarding possible wiring errors on the PCB. https://theopenexo.nau.edu/community/pcb-electrical/feedback-regarding-possible-wiring-errors-on-the-pcb/ Fri, 23 Jan 2026 05:55:48 +0000 Dear Development Team,In Figure 1, gray and purple represent the ground and power sections, respectively, while green and yellow wires are used for the I²C lines. However, in Figure 2, the I²C pull-up resistors are connected to the gray line, which pulls the signal lines low. Could this be an error in the illustration? We sincerely look forward to your clarification.

]]> PCB - Electrical huang_EnHong https://theopenexo.nau.edu/community/pcb-electrical/feedback-regarding-possible-wiring-errors-on-the-pcb/ For component U5 in the BOM table https://theopenexo.nau.edu/community/pcb-electrical/for-component-u5-in-the-bom-table/ Sun, 21 Dec 2025 09:55:46 +0000 For component U5 in the PCB BOM table (with Designator SN65HVD230DR in the BOM table), could you please tell me what model of component you are using? The one I am using is C12084—Is this feasible?

]]> PCB - Electrical wuyang https://theopenexo.nau.edu/community/pcb-electrical/for-component-u5-in-the-bom-table/ Regarding the two microcontrollers https://theopenexo.nau.edu/community/pcb-electrical/regarding-the-two-microcontrollers/ Wed, 10 Dec 2025 08:15:13 +0000 According to your recommendation, we should use the Teensy 4.1 1568-DEV-16996-ND and Nano 33 BLE 1050-ABX00034-ND controllers.

However, we are currently using the Teensy 4.1 DEV-16771 and ARDUINO NANO 33 BLE ABX00030 nRF52840. Will this affect the implementation of the exoskeleton, and do we need to make any changes to the exoskeleton system for this?

]]> PCB - Electrical wuyang https://theopenexo.nau.edu/community/pcb-electrical/regarding-the-two-microcontrollers/ Inquiry about INA125U Chip Model and JLCPCB Part Number https://theopenexo.nau.edu/community/pcb-electrical/inquiry-about-ina125u-chip-model-and-jlcpcb-part-number/ Fri, 28 Nov 2025 10:42:33 +0000 Dear OpenExo Team,

After reading the BOM file, I couldn't find the number of the INA125U JLCPCB part and couldn't confirm the model of the chip. May I ask if you could provide the chip selection and JLCPCB part number used in designing this circuit? Thank you!

]]> PCB - Electrical liangji https://theopenexo.nau.edu/community/pcb-electrical/inquiry-about-ina125u-chip-model-and-jlcpcb-part-number/ About the component selection of U3/U4(INA125U) https://theopenexo.nau.edu/community/pcb-electrical/about-the-component-selection-of-u3-u4ina125u/ Fri, 28 Nov 2025 09:14:47 +0000 Dear Openexo team,
I did not see the JLCPCB part regarding the INA125U amplifier in the BOM file. Cuz there are many 16 pin INA125U, I wonder if the selection of chips will affect the performance of the circuit. May I ask if you can provide the selection of INA125U that you are using? Thanks!

]]> PCB - Electrical Ruoran https://theopenexo.nau.edu/community/pcb-electrical/about-the-component-selection-of-u3-u4ina125u/ The Teensy main control was burned out after the circuit board was connected to a 22V power supply (a 6S lithium - ion battery). https://theopenexo.nau.edu/community/pcb-electrical/the-teensy-main-control-was-burned-out-after-the-circuit-board-was-connected-to-a-22v-power-supply-a-6s-lithium-ion-battery/ Thu, 27 Nov 2025 07:34:35 +0000 After I connected a 6S RC aircraft battery power supply (with a voltage of approximately 23V) to the circuit board, the Teensy 4.1 control board suddenly burned out, but the Arduino Nano remained undamaged.

Before installing the Teensy 4.1 and Nano on the expansion circuit board, I connected the same 6S battery to the expansion board and tested the voltages of the pins where the Teensy and Nano would be mounted. Among these pins, the voltages of the 5V power supply pins of both the Teensy and Nano relative to ground were normal, while the other pins had no voltage relative to ground—either zero or a very small voltage relative to ground. As far as I can remember, this should be normal.

Furthermore, after installing the Teensy and Nano on the expansion board for the first time, I also tested with the same battery and uploaded a simple verification program, and everything worked normally at that time.

However, during the most recent power-on (using the same 6S battery, with a voltage of approximately 23V), the Teensy was directly burned out. The symptom was that a resistor on the Teensy heated up abnormally, and the output voltage of the 3.3V pin was less than 1V. Strangely, the Arduino Nano still worked even when the Teensy was burned out. I think the 5V pins of the Nano and the Teensy are connected in series, right?

I really can't figure out what's going on—could it be that the voltage fluctuation when plugging or unplugging the power supply burned out the Teensy? I hope you can provide some suggestions. Additionally, if I buy another Teensy to install on the expansion board, what methods can be used to prevent similar incidents from happening again?

]]> PCB - Electrical wuyang https://theopenexo.nau.edu/community/pcb-electrical/the-teensy-main-control-was-burned-out-after-the-circuit-board-was-connected-to-a-22v-power-supply-a-6s-lithium-ion-battery/ Regarding PCB import file generation, there are missing components https://theopenexo.nau.edu/community/pcb-electrical/regarding-pcb-import-file-generation-there-are-missing-components/ Tue, 18 Nov 2025 08:37:34 +0000 Hello, I made the PCB on a 3rd party platform. At present, according to the guide, the Gerber file, BOM and CPL have been imported, but the generated preview obviously lacks the physical drawing in the guide. It is a big blue component strip with a QR code in the center. Please forgive my metaphor, but the BOM does not have relevant models and specifications. Please have a look, thank you

]]> PCB - Electrical wangyuxin https://theopenexo.nau.edu/community/pcb-electrical/regarding-pcb-import-file-generation-there-are-missing-components/ Regarding power connection https://theopenexo.nau.edu/community/pcb-electrical/regarding-power-connection/ Wed, 05 Nov 2025 15:50:25 +0000 Hello, could you please tell me which side of the PCB board's power interface should be connected to the positive electrode of the power supply and which side to the negative electrode? My power interface is not XT30, so some soldering may be required.

]]> PCB - Electrical wuyang https://theopenexo.nau.edu/community/pcb-electrical/regarding-power-connection/ Regarding how to test a PCB board https://theopenexo.nau.edu/community/pcb-electrical/regarding-how-to-test-a-pcb-board/ Wed, 29 Oct 2025 16:15:08 +0000 Hello, I have customized the PCB board specified in the CAN Motor PCB Files on JLCPCB and placed an order for the PCB SMT (Surface Mount Technology) service on the same platform. Could you please advise on how to test the PCB to verify if the customized one is qualified, without soldering the Teensy 4.1 and Arduino Nano 33 BLE microcontrollers? (I am worried that an unqualified PCB might burn out these microcontrollers.) I sincerely look forward to your response!

]]> PCB - Electrical wuyang https://theopenexo.nau.edu/community/pcb-electrical/regarding-how-to-test-a-pcb-board/ Part Clarification on Fuse U$6 https://theopenexo.nau.edu/community/pcb-electrical/part-clarification-on-fuse-u6-2/ Tue, 28 Oct 2025 20:03:16 +0000 Hello OpenExo Team:

I've noticed that in the construction the surface mounted fuse (U$6) appears to differ from the one in the BOM (0458002.DR). Could you please clarify the part number for the one used in construction?

Thank you! 

]]> PCB - Electrical JamesM https://theopenexo.nau.edu/community/pcb-electrical/part-clarification-on-fuse-u6-2/