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• Project Status 3

  scott • 3 hours ago • 0 comments

  Updates since 27 AUG 2025

  - replaced J8 and J9 (LEFT_ENABLE and RIGHT_ENABLE) with jumpers
  - changed SW1 symbol and footprint
  - changed USB Micro symbol and footprint
  - added ESD protection to micro USB
  - replaced boot switch to boot button
  - added crystal capacitor calculations
  - added grounded mounting holes
  - changed all 0402 to 0603 for hand-soldering
  - "Do not populate" for J3, J11
  - changed J11 pinout for better trace routing
  - changed J2 and J4 to horizontal connectors
  - finished PCB design
  - changed and added numerous printed parts
  - ordered and assembled board
  - verified built-in LED working
  - verified laser circuit working
  - verified HSE crystal circuit working

  Issues

  - AMS1117-5.0 was initially dead; replaced
  - USB micro B had two pins shorted; lifted GND pad when trying to remove

  Changes to v1.1

  - STEP and DIRECTION Test Points pins are incorrect on A1 and A2
  - BOOT0 had a 100nF capacitor to GND instead of pull-down resistor; this caused floating issues when programming

  To do:

  - test pin functions on bluepill as specified:
  - end stop interrupts
  - UART Tx and Rx from pi 5
  - YAW/PITCH motor function
  - RIGHT/LEFT motor function
  - dual-camera stuff with pi 5

• Project Status 2

  scott • 08/27/2025 at 22:46 • 0 comments

  27 AUG 2025

  Since last update:

  • Added 2 test points: PITCH_STEP, YAW_STEP
  • Added comments about STEP pins in schematic
  • Changed PITCH_END, LEFT_END, RIGHT_END, LASER, SPARE_IN0, SPARE_IN1, SPARE_OUT0, SPARE_OUT1 pins due to external interrupt needs
  • Changed focus motor drive calculations due to Adafruit motors are 1/16 ratio
  • Created UART transmit codes
  • Tested PWM for PA8 (PITCH_STEP) and PB0 (YAW_STEP); calculated prescaler, period counter, and pulse values
  • Calculated estimated max current draw of system
  • Updated Bino Pi Reference Sheet, schematic

  Future Plans:

  Short Term:

  • Get timing interrupt to work
  • Create 6 sequences for focus motor stepping: 1-phase full step CW & CCW, 2-phase full step CW & CCW, half-step CW & CCW
  • Test UART and transmit codes (TX from MCU to Analog Discovery 3 working; need to test RX on MCU)
  • Test endstop interrupts
  • Test laser output circuit using 2N3904; determine experimental current consumption

  Long Term:

  • Submit PCB for fabrication
  • Adjust bottom assembly mounting for PCBA
  • Verify operation of PCBA
  • Conduct dual-camera operations with OpenCV in Python

• Project Status 1

  scott • 07/30/2025 at 22:16 • 0 comments

  30 JUL 2025

  Working on Bino Pi Gimble Control PCB.

  Future Plans:

  • Submit PCB for fabrication
  • Redesign bottom assembly mounting with PCBA
  • Verify operation of PCBA for all peripherals
  • Enable UART communication between Pi 5 and STM32F103C8T6
  • Conduct dual-camera operations with OpenCV in Python

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