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Thread: Teensy 3.6 SD Card Problems with external power

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  1. #1
    Junior Member
    Join Date
    Jan 2021

    Teensy 3.6 SD Card Problems with external power

    Hello Folks,
    I run into some problems whenn using my Teensy 3.6 with external power.
    I'm trying to run a project with a GPS shield, IMU and pressure Sensor. All data shall be saved on a MicroSD Card on the built in card slot. Everything works fine when I power the Teensy over USB but when I try to power the microcontroller externally the controller is not able to open the SD card for writing and reading.
    As a power source I'm using two 1.5 Mono D cells with a 5V voltage step up regulator (Pololu U3V12F5).
    If I'm giving the setup power over the USB cable first and then pull on the external power and removing the USB cable it works too but I don't allways want to start the system over USB and then switching to external.

    After googling for a while I cannot find any suggestions for troubleshooting the explained problem.
    Has anyone of you any suggestions?

    thanks in advance

    I will add a schematic of the project.Click image for larger version. 

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    Last edited by RASTA_SUG; 01-28-2021 at 03:32 PM.

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