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Tinker Thoughts Blog

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  • Giving Life to an OLD Digit Display

    TTB #25: Giving Life to an OLD Digit Display

    If you tinker with electronics long enough, you eventually build a stash of random spare parts. In this post, I dig into components from my 25 year old collection and revive a single digit seven segment display that has not seen power in decades. After mapping each segment to GPIO pins on the Nano Flip, I programmed two simple display modes: a rotating chase pattern along the outer segments and a repeating counter from zero to nine. It is a fun reminder that even old salvaged parts can still shine with a little curiosity and a few lines of code.

    TTB #25: Giving Life to an OLD Digit Display

    If you tinker with electronics long enough, you eventually build a stash of random spare parts. In this post, I dig into components from my 25 year old collection and revive a single digit seven segment display that has not seen power in decades. After mapping each segment to GPIO pins on the Nano Flip, I programmed two simple display modes: a rotating chase pattern along the outer segments and a repeating counter from zero to nine. It is a fun reminder that even old salvaged parts can still shine with a little curiosity and a few lines of code.

  • Reversing the Polarity on LiPo Battery JST Connectors

    TTB #24: Reversing the Polarity on LiPo Battery JST Connectors

    The 2-Pin JST-PH 2.0 connector is found on many LiPo batteries used in hobby drones, RC cars and toys, and of course electrical boards and modules. These are handy little connectors, but there is one problem - the polarity convention. About half of the vendors connect the negative (black wire) on the left and the positive (red wire) on the right sides. The other half does it the other way around. This can be an issue if the board or electronics you want to plug the LiPo battery into has the reversed polarity convention. Plugging in the LiPo terminals backwards...

    TTB #24: Reversing the Polarity on LiPo Battery JST Connectors

    The 2-Pin JST-PH 2.0 connector is found on many LiPo batteries used in hobby drones, RC cars and toys, and of course electrical boards and modules. These are handy little connectors, but there is one problem - the polarity convention. About half of the vendors connect the negative (black wire) on the left and the positive (red wire) on the right sides. The other half does it the other way around. This can be an issue if the board or electronics you want to plug the LiPo battery into has the reversed polarity convention. Plugging in the LiPo terminals backwards...

  • Powering a 9g 360° Servo Motor Directly from a Nano Dev Board

    TTB #23: Powering a 9g 360° Servo Motor Directly from a Nano Dev Board

    This tutorial investigates whether a 9g 360° servo motor can be powered directly from the Nano Dev Board without external supply. Using detailed current and voltage measurements under start-up, steady-state, and stall conditions, the results show the Nano Flip’s onboard regulator and USB-C path can safely handle the current draw without voltage sag below 4.96 V. Both USB-C and Vin configurations were tested with consistent stability. While this approach is suitable for short tests and educational use, long-term or production designs should still employ a dedicated power supply for servos to ensure reliability and isolation from the microcontroller rail.

    TTB #23: Powering a 9g 360° Servo Motor Directly from a Nano Dev Board

    This tutorial investigates whether a 9g 360° servo motor can be powered directly from the Nano Dev Board without external supply. Using detailed current and voltage measurements under start-up, steady-state, and stall conditions, the results show the Nano Flip’s onboard regulator and USB-C path can safely handle the current draw without voltage sag below 4.96 V. Both USB-C and Vin configurations were tested with consistent stability. While this approach is suitable for short tests and educational use, long-term or production designs should still employ a dedicated power supply for servos to ensure reliability and isolation from the microcontroller rail.

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