rich27 / UtProSat Payload board - History

Worked on the BOM some more. Still need to add the SD card, crystal oscillators, and ferrite bead.

Added some more parts to the BOM. Almost done, but have to get going.

Added a buffer for reading digital signals. Will add a pinheader tomorrow. Also added LEDs to indicate power. Still need to finish the BOM and then connect all devices to the MCU.

Rearraged come of the circuits and added new circuitry for the stepper motor driver.

Push with the PicoBlade 8pin connector for the ArduCam

I found a schematic online for a stepper motor driver that uses the L298! Tomorrow I'm going to edit the circuitry to include those schematics. Here's the link for the stepper motor board: https://github.com/AntonioMR/ATMEGA328-Motor-Board/blob/master/pcb/pdf/ATMEGA328-Motor-Board-Esquema.pdf

Started creating the BOM. Got the coin cell battery holder, capacitors, and diodes. For the LDO's I added a protection diode in the event the input to the LDO is shorted. Also changed the analog input schematic to have 0 ohm resistors. Need to figure out if I need to bias the input voltage as we are using the op amps in single supply mode. Also need to change the MCU, add header pins to all comms channels, and add test points to all power inputs.

Added decoupling capacitors to the LDO's on the IMU's. Need to figure out if Boom tip IMU is going to be on board or not for prototype. Need to simulate/maybe redesign current sense circuit for stepper motors. Need to redesign sd card schematic. Pulled the original schematic from analog devices. Adafruit has a totally different setup that I saw before but forgot. Need to decide to change MCU to something else.