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# SystemPower (UORB message)

**TOPICS:** system_power

## Fields

| Name               | Type         | Unit [Frame] | Range/Enum | Description                                   |
| ------------------ | ------------ | ------------ | ---------- | --------------------------------------------- |
| timestamp          | `uint64`     |              |            | time since system start (microseconds)        |
| voltage5v_v        | `float32`    |              |            | peripheral 5V rail voltage                    |
| voltage_payload_v  | `float32`    |              |            | payload rail voltage                          |
| sensors3v3         | `float32[4]` |              |            | Sensors 3V3 rail voltage                      |
| sensors3v3_valid   | `uint8`      |              |            | Sensors 3V3 rail voltage was read (bitfield). |
| usb_connected      | `uint8`      |              |            | USB is connected when 1                       |
| brick_valid        | `uint8`      |              |            | brick bits power is good when bit 1           |
| usb_valid          | `uint8`      |              |            | USB is valid when 1                           |
| servo_valid        | `uint8`      |              |            | servo power is good when 1                    |
| periph_5v_oc       | `uint8`      |              |            | peripheral overcurrent when 1                 |
| hipower_5v_oc      | `uint8`      |              |            | high power peripheral overcurrent when 1      |
| comp_5v_valid      | `uint8`      |              |            | 5V to companion valid                         |
| can1_gps1_5v_valid | `uint8`      |              |            | 5V for CAN1/GPS1 valid                        |
| payload_v_valid    | `uint8`      |              |            | payload rail voltage is valid                 |

## Constants

| Name                                                  | Type    | Value | Description |
| ----------------------------------------------------- | ------- | ----- | ----------- |
| <a id="#BRICK1_VALID_SHIFTS"></a> BRICK1_VALID_SHIFTS | `uint8` | 0     |
| <a id="#BRICK1_VALID_MASK"></a> BRICK1_VALID_MASK     | `uint8` | 1     |
| <a id="#BRICK2_VALID_SHIFTS"></a> BRICK2_VALID_SHIFTS | `uint8` | 1     |
| <a id="#BRICK2_VALID_MASK"></a> BRICK2_VALID_MASK     | `uint8` | 2     |
| <a id="#BRICK3_VALID_SHIFTS"></a> BRICK3_VALID_SHIFTS | `uint8` | 2     |
| <a id="#BRICK3_VALID_MASK"></a> BRICK3_VALID_MASK     | `uint8` | 4     |
| <a id="#BRICK4_VALID_SHIFTS"></a> BRICK4_VALID_SHIFTS | `uint8` | 3     |
| <a id="#BRICK4_VALID_MASK"></a> BRICK4_VALID_MASK     | `uint8` | 8     |

## Source Message

[Source file (GitHub)](https://github.com/PX4/PX4-Autopilot/blob/main/msg/SystemPower.msg)

::: details Click here to see original file

```c
uint64 timestamp		# time since system start (microseconds)
float32 voltage5v_v		# peripheral 5V rail voltage
float32 voltage_payload_v	# payload rail voltage
float32[4] sensors3v3		# Sensors 3V3 rail voltage
uint8 sensors3v3_valid		# Sensors 3V3 rail voltage was read (bitfield).
uint8 usb_connected		# USB is connected when 1
uint8 brick_valid		# brick bits power is good when bit 1
uint8 usb_valid 		# USB is valid when 1
uint8 servo_valid		# servo power is good when 1
uint8 periph_5v_oc		# peripheral overcurrent when 1
uint8 hipower_5v_oc		# high power peripheral overcurrent when 1
uint8 comp_5v_valid		# 5V to companion valid
uint8 can1_gps1_5v_valid	# 5V for CAN1/GPS1 valid
uint8 payload_v_valid		# payload rail voltage is valid

uint8 BRICK1_VALID_SHIFTS=0
uint8 BRICK1_VALID_MASK=1
uint8 BRICK2_VALID_SHIFTS=1
uint8 BRICK2_VALID_MASK=2
uint8 BRICK3_VALID_SHIFTS=2
uint8 BRICK3_VALID_MASK=4
uint8 BRICK4_VALID_SHIFTS=3
uint8 BRICK4_VALID_MASK=8
```

:::