Changes to be made to ZP3 Interface Dev Board:
- 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
CONNECTORS
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I2C conn (J7, J12, J16). Replace with BM04B-GHS-TBT 4-pin connector.
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On the Pixhawk, there are BM08BGPIO conn (J31, J32). Replace with BM06B-GHS-TBT 8 6-pin connectors which share GPIOs and ADC inputs
The following is their pinout (pin 1 VCC, pin 8 GND, pins 2-5 GPIOs, pin 6-7 ADC inputs)
There are 10 GPIOs + 3 ADC inputs on our flight board, we can use 2 8-pin connectors containing all GPIOs and 1 8-pin connector containing all ADC inputs. Another option would be to:
GPIO conn (J31, 32). Replace with 2 8-pin (or either 0.1” pitch through hole solder pads for option of using pin headers or direct soldering).
ADC conn (J28). 0.1” Pin sockets/headers.ADC conn (J28). Replace with BM04B-GHS-TBT 4-pin connectors (Pins 1-3 are IOs, pin 4 is GND).
Jerry Tian suggested these GPIO and ADC connector replacements.
(Pins 1-5 are IOs, pin 6 is GND).
TIM conn (J3, 4, 9, 10, 14, 15, 19, 20, 21, 22, 8, 13, 17, 24, 25, 29). Going to use a 3-row 16-pin per row 0.1” right-angle pin header. This is shown to be done by Pixhawk here.
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The IMU can communicate with I2C and SPI. I2C and SPI already have ports on the interface board so we could potentially route these to the IMU and use jumper pins so the IMU can be disconnected when this port needs to be used. Unused pins on the STM32 are not connected to the connectors in the ZP3 schematic so these can not be used to to connect to the IMU on the interface board. Using the 61300211121 header pins since we already have the component on Altium.
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.
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.
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