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- Change 2.54mm pin socket connectors to match Pixhawk Connector Standard (Pixhawk-Standards/DS-009 Pixhawk Connector Standard.pdf at v6xupdate · pixhawk/Pixhawk-Standards · GitHub)
- Remove ST-Link connector
- Decide on which sensors to add (if any) with EFS
- Remove LEDs?
- Add IMU
Fixes to be made:
- Fix 4-pin GH Connector Pinout
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CONNECTORS
All interfaces which have a pixhawk standard connector (UART, I2C, SPI, ST-Link) except for debug (ST-Link) will be replaced with GH series JST connectors. Debug will use SH series. The rest (GPIO, ADC input, TIM) don’t have a standard, and thus will use what’s found in COTS products or what intuitively feels convenient.
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Edit to the paragraph above. Daniel brought up the fact that I2C and SPI are bussed protocols. Therefore they do not have to be disconnected from the connector and both can be used at the same time. This works fine for I2C but Anthony mentioned that for SPI, we would still need additional chip select lines. We could use the GPIO pins for this. I will still include jumper header pins 0 ohm resistors here so the GPIO pins can be used if desired. The 0 ohm was chosen over the headers because they are more reliable and cheaper.
Barometer
We decided since we can have multiple devices on the SPI bus, we will include a barometer as well. We will be including the MS561101BA03-50 as per Derek's recommendation.
LDO
The VDDIO pin on the IMU has a max voltage rating of 1.95V so a voltage regulator will be needed. I have chosen the AP2112K-1.8TRG1 since it is relatively cheap and highly in stock.
This is no longer needed since we are now using a different IMU.
Other Additions
Now there seems to be considerations for a barometer and compass/magnetometer on board. EFS has been asked what they would like to have on it. Edits have been made above to include the magnetometer. The barometer seems excessive and would require a less common IMU or separate component. This likely would not be included. It is fairly expensive but is a common choice for our type of application.
Magnetometer
Since the IMU does not have a magnetometer, we will need to include one. I have chosen the BMM150 since it seems to be well stocked, relatively cheap, and good for this application. I have chosen the MLX90393 since the BMM150 is too small.
It should be aligned to the following axes:
Other Additions
This document from September outlines some potential improvements for the ZP3 board. It has not been touched since. EFS has been asked if this is still relevant and if they want these suggestions to be added.
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