zbr3550
5 years ago
11 changed files with 459 additions and 11 deletions
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# Pixhawk4 Flight Controller |
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|
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The Pixhawk4 flight controller is sold by [Holybro](http://www.holybro.com/product/pixhawk-4) |
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## Features |
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|
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- STM32F765 microcontroller |
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- Two IMUs: ICM20689 and BMI055 |
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- MS5611 SPI barometer |
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- builtin I2C IST8310 magnetometer |
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- microSD card slot |
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- 6 UARTs plus USB |
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- 14 PWM outputs |
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- Four I2C and two CAN ports |
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- External Buzzer |
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- external safety Switch |
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- voltage monitoring for servo rail and Vcc |
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- two dedicated power input ports for external power bricks |
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|
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## Pinout |
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|
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![Pixhawk4 Board](pixhawk4-pinout.jpg "Pixhawk4") |
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|
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## UART Mapping |
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- SERIAL0 -> USB |
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- SERIAL1 -> UART2 (Telem1) |
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- SERIAL2 -> UART3 (Telem2) |
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- SERIAL3 -> UART1 (GPS) |
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- SERIAL4 -> UART4 (GPS2) |
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- SERIAL5 -> UART6 (spare) |
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- SERIAL6 -> UART7 (spare, debug) |
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|
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The Telem1 and Telem2 ports have RTS/CTS pins, the other UARTs do not |
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have RTS/CTS. |
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|
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The UART7 connector is labelled debug, but is available as a general |
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purpose UART with ArduPilot. |
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|
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### TELEM1, TELEM2 ports |
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|
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<table border="1" class="docutils"> |
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<tbody> |
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<tr> |
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<th>Pin </th> |
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<th>Signal </th> |
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<th>Volt </th> |
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</tr> |
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<tr> |
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<td>1 (red)</td> |
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<td>VCC</td> |
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<td>+5V</td> |
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</tr> |
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<tr> |
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<td>2 (blk)</td> |
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<td>TX (OUT)</td> |
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<td>+3.3V</td> |
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</tr> |
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<tr> |
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<td>3 (blk)</td> |
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<td>RX (IN)</td> |
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<td>+3.3V</td> |
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</tr> |
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<tr> |
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<td>4 (blk)</td> |
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<td>CTS</td> |
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<td>+3.3V</td> |
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</tr> |
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<tr> |
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<td>5 (blk)</td> |
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<td>RTS</td> |
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<td>+3.3V</td> |
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</tr> |
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<tr> |
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<td>6 (blk)</td> |
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<td>GND</td> |
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<td>GND</td> |
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</tr> |
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</tbody> |
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</table> |
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|
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### GPS port |
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<table border="1" class="docutils"> |
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<tbody> |
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<tr> |
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<th>Pin </th> |
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<th>Signal </th> |
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<th>Volt </th> |
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</tr> |
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<tr> |
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<td>1 (red)</td> |
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<td>VCC</td> |
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<td>+5V</td> |
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</tr> |
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<tr> |
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<td>2 (blk)</td> |
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<td>SERIAL3 TX (OUT)</td> |
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<td>+3.3V</td> |
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</tr> |
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<tr> |
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<td>3 (blk)</td> |
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<td>SERIAL3 RX (IN)</td> |
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<td>+3.3V</td> |
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</tr> |
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<tr> |
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<td>4 (blk)</td> |
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<td>SCL</td> |
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<td>+3.3 (pullups)</td> |
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</tr> |
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<tr> |
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<td>5 (blk)</td> |
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<td>SDA</td> |
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<td>+3.3 (pullups)</td> |
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</tr> |
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<tr> |
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<td>6 (blk)</td> |
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<td>SafetyButton</td> |
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<td>+3.3V</td> |
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</tr> |
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<tr> |
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<td>7 (blk)</td> |
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<td>SafetyLED</td> |
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<td>+3.3V</td> |
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</tr> |
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<tr> |
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<td>8 (blk)</td> |
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<td>VDD 3.3 (OUT)</td> |
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<td>+3.3V</td> |
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</tr> |
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<tr> |
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<td>9 (blk)</td> |
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<td>Buzzer</td> |
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<td>+3.3V</td> |
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</tr> |
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<tr> |
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<td>10 (blk)</td> |
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<td>GND</td> |
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<td>GND</td> |
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</tr> |
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</tbody> |
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</table> |
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|
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## RC Input |
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RC input is configured on the port marked DSM/SBUS RC. This connector |
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supports all RC protocols. Two cables are available for this port. To |
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use software binding of Spektrum satellite receivers you need to use |
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the Spektrum satellite cable. |
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|
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## PWM Output |
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|
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The Pixhawk4 supports up to 16 PWM outputs. First first 8 outputs (labelled |
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"MAIN") are controlled by a dedicated STM32F100 IO controller. These 8 |
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outputs support all PWM output formats, but not DShot. |
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The remaining 8 outputs (labelled AUX1 to AUX8) are the "auxillary" |
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outputs. These are directly attached to the STM32F765 and support all |
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PWM protocols. The first 6 of the auxillary PWM outputs support DShot. |
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The 8 main PWM outputs are in 3 groups: |
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- PWM 1 and 2 in group1 |
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- PWM 3 and 4 in group2 |
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- PWM 5, 6, 7 and 8 in group3 |
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The 8 auxillary PWM outputs are in 2 groups: |
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- PWM 1, 2, 3 and 4 in group1 |
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- PWM 5 and 6 in group2 |
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- PWM 7 and 8 in group3 |
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Channels within the same group need to use the same output rate. If |
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any channel in a group uses DShot then all channels in the group need |
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to use DShot. |
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|
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## Battery Monitoring |
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The board has two dedicated power monitor ports on 6 pin |
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connectors. The correct battery setting parameters are dependent on |
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the type of power brick which is connected. |
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|
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## Compass |
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The Pixhawk4 has a builtin IST8310 compass. Due to potential |
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interference the board is usually used with an external I2C compass as |
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part of a GPS/Compass combination. |
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|
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## GPIOs |
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The 6 PWM ports can be used as GPIOs (relays, buttons, RPM etc). To |
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use them you need to limit the number of these pins that is used for |
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PWM by setting the BRD_PWM_COUNT to a number less than 6. For example |
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if you set BRD_PWM_COUNT to 4 then PWM5 and PWM6 will be available for |
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use as GPIOs. |
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The numbering of the GPIOs for PIN variables in ArduPilot is: |
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- AUX1 50 |
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- AUX2 51 |
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- AUX3 52 |
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- AUX4 53 |
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- AUX5 54 |
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- AUX6 55 |
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|
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## Analog inputs |
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The Pixhawk4 has 7 analog inputs |
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- ADC Pin0 -> Battery Voltage |
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- ADC Pin1 -> Battery Current Sensor |
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- ADC Pin2 -> Battery Voltage 2 |
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- ADC Pin3 -> Battery Current Sensor 2 |
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- ADC Pin4 -> ADC port pin 2 |
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- ADC Pin14 -> ADC port pin 3 |
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- ADC Pin10 -> ADC 5V Sense |
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- ADC Pin11 -> ADC 3.3V Sense |
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- ADC Pin103 -> RSSI voltage monitoring |
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|
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## I2C Buses |
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- the internal I2C port is bus 0 in ArduPilot (I2C3 in hardware) |
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- the port labelled I2CA is bus 3 in ArduPilot (I2C4 in hardware) |
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- the port labelled I2CB is bus 2 in ArduPilot (I2c2 in hardware) |
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- the port labelled GPS is bus 1 in ArduPilot (I2c1 in hardware) |
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|
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### Pinout for I2CA |
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<table border="1" class="docutils"> |
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<tbody> |
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<tr> |
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<th>Pin</th> |
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<th>Signal</th> |
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<th>Volt</th> |
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</tr> |
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<tr> |
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<td>1 (red)</td> |
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<td>VCC</td> |
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<td>+5V</td> |
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</tr> |
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<tr> |
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<td>2 (blk)</td> |
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<td>SCL</td> |
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<td>+3.3 (pullups)</td> |
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</tr> |
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<tr> |
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<td>3 (blk)</td> |
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<td>SDA</td> |
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<td>+3.3 (pullups)</td> |
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</tr> |
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<tr> |
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<td>4 (blk)</td> |
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<td>GND</td> |
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<td>GND</td> |
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</tr> |
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</tbody> |
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</table> |
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|
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### Pinout for I2CB+UART |
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<table border="1" class="docutils"> |
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<tbody> |
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<tr> |
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<th>Pin</th> |
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<th>Signal</th> |
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<th>Volt</th> |
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</tr> |
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<tr> |
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<td>1 (red)</td> |
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<td>VCC</td> |
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<td>+5V</td> |
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</tr> |
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<tr> |
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<td>2 (blk)</td> |
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<td>SERIAL4 TX (OUT)</td> |
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<td>+3.3V</td> |
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</tr> |
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<tr> |
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<td>3 (blk)</td> |
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<td>SERIAL4 RX (IN)</td> |
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<td>+3.3V</td> |
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</tr> |
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<tr> |
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<td>4 (blk)</td> |
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<td>SCL</td> |
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<td>+3.3 (pullups)</td> |
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</tr> |
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<tr> |
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<td>5 (blk)</td> |
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<td>SDA</td> |
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<td>+3.3 (pullups)</td> |
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</tr> |
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<tr> |
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<td>6 (blk)</td> |
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<td>GND</td> |
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<td>GND</td> |
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</tr> |
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</tbody> |
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</table> |
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## CAN |
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The Pixhawk4 has two independent CAN buses, with the following pinouts. |
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### CAN1&2 |
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<table border="1" class="docutils"> |
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<tbody> |
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<tr> |
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<th>Pin</th> |
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<th>Signal</th> |
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<th>Volt</th> |
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</tr> |
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<tr> |
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<td>1 (red)</td> |
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<td>VCC</td> |
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<td>+5V</td> |
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</tr> |
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<tr> |
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<td>2 (blk)</td> |
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<td>CAN_H</td> |
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<td>+12V</td> |
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</tr> |
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<tr> |
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<td>3 (blk)</td> |
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<td>CAN_L</td> |
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<td>+12V</td> |
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</tr> |
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<tr> |
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<td>4 (blk)</td> |
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<td>GND</td> |
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<td>GND</td> |
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</tr> |
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</tbody> |
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</table> |
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## Debug |
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The Pixhawk4 supports SWD debugging on the debug port |
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<table border="1" class="docutils"> |
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<tbody> |
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<tr> |
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<th>Pin </th> |
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<th>Signal </th> |
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<th>Volt </th> |
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</tr> |
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<tr> |
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<td>1 (red)</td> |
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<td>FMU VDD 3.3</td> |
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<td>+3.3V</td> |
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</tr> |
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<tr> |
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<td>2 (blk)</td> |
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<td>UART TX Debug (OUT)</td> |
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<td>+3.3V</td> |
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</tr> |
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<tr> |
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<td>3 (blk)</td> |
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<td>UART RX Debug (IN)</td> |
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<td>+3.3V</td> |
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</tr> |
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<tr> |
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<td>4 (blk)</td> |
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<td>SWDIO</td> |
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<td>+3.3V</td> |
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</tr> |
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<tr> |
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<td>5 (blk)</td> |
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<td>SWCLK</td> |
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<td>+3.3V</td> |
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</tr> |
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<tr> |
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<td>6 (blk)</td> |
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<td>GND</td> |
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<td>GND</td> |
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</tr> |
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</tbody> |
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</table> |
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|
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## Loading Firmware |
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The board comes pre-installed with an ArduPilot compatible bootloader, |
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allowing the loading of *.apj firmware files with any ArduPilot |
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compatible ground station. |
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|
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## Acknowledgements |
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Thanks to |
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[PX4](https://docs.px4.io/en/flight_controller/pixhawk4.html) for |
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images used under the [CC-BY 4.0 license](https://creativecommons.org/licenses/by/4.0/) |
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# Pixhawk4 does not have hw flow control on radios |
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BRD_SER1_RTSCTS 0 |
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BRD_SER2_RTSCTS 0 |
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# hw definition file for processing by chibios_hwdef.py |
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# for Pixhawk4 bootloader |
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include ../fmuv5/hwdef-bl.dat |
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# hw definition file for processing by chibios_hwdef.py |
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# for Holybro Pixhawk4 hardware. |
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include ../fmuv5/hwdef.dat |
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# setup for supplied power brick |
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undef HAL_BATT_VOLT_SCALE |
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define HAL_BATT_VOLT_SCALE 18.182 |
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undef HAL_BATT_CURR_SCALE |
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define HAL_BATT_CURR_SCALE 36.364 |
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