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Schematic/Pre-PCB Tasks

Status

Fix servo backfeed issue

Completed

Add seeeduino xiao to schematic

  • Make it have removable headers if possible?

  • Have debug pins for efs

Completed

Determine the correct connector for the gps and add to the schematic

Completed

Add wifi module to schematic (connector)

  • No longer adding this. Wifi will be part of the seeeduino to save pins.

Not Doing

Bonus tasks: Can be saved for next rev but good if time

Select and add neopixels

  • “Add diode for Neopixel supply voltage, drop 0.7V to meet data sheet supply voltage to logic voltage ratio”

In progress

Select barometer and add to schematic

  • Ask EFS for thoughts?

  • Just adding an I2C header, reasons mentioned above.

Completed

  • Display screen on board or external (TFT variant)

In Progress

  • If possible usb port for debugging mavlink?

Not doing

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The battery power pins are on the bottom of the board and must be soldered, so when connected with the header pins, we can not access that. To fix this, we can just connect our 5V buck to the USB 5V power rail. The seeeduino has a fair bit of protection on the inputs, but it will still short the USB to the battery if both are connected at once. I will place a diode from the 5V buck to the input/USB power so the USB power does not get fed into the battery. However due to the design of the Seeduino, I can not prevent current from feeding from the battery towards the laptop, however the laptop should not be drawing excess current and it should have robust input protection.

There is internally a regulator to drop the voltage to 3.3V so I will use a Shottkey diode so the input voltage to this regulator is high enough.

ESP32 datasheet for power reference esp32-c3_datasheet_en.pdf (espressif.com) - this suggests 1A of output current could theoretically be pulled. The schematic shows the regulator only can withstand 750mA anyways so I will design towards that spec when choosing the diode. I will choose something at least 1A for safety factorTo be sage. Since diodes are cheap, I will give lots of overhead and go for a minimum 1.5A of rectified current diode.

There are thousands of diodes that meet this spec. This one meets this spec and was the lowest forward voltage I can find at a cheap price.

CRS15I30B(TE85L,QM Toshiba Semiconductor and Storage | Discrete Semiconductor Products | DigiKey

Vf = 400mV

If = 1.5A

Nathan’s seeeduino tracking antenna board is here for reference hardware/Projects/Arduino_AAT at master · UWARG/hardware (github.com).

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