PX4-Autopilot/docs/en/msg_docs/ActuatorTest.md
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---
pageClass: is-wide-page
---
# ActuatorTest (UORB message)
**TOPICS:** actuator_test
## Fields
| Name | Type | Unit [Frame] | Range/Enum | Description |
| ---------- | --------- | ------------ | ---------- | ------------------------------------------------------------------- |
| timestamp | `uint64` | | | time since system start (microseconds) |
| action | `uint8` | | | one of ACTION\_\* |
| function | `uint16` | | | actuator output function |
| value | `float32` | | | range: [-1, 1], where 1 means maximum positive output, |
| timeout_ms | `uint32` | | | timeout in ms after which to exit test mode (if 0, do not time out) |
## Constants
| Name | Type | Value | Description |
| ----------------------------------------------------------- | ------- | ----- | ---------------------------------------------------- |
| <a id="#ACTION_RELEASE_CONTROL"></a> ACTION_RELEASE_CONTROL | `uint8` | 0 | exit test mode for the given function |
| <a id="#ACTION_DO_CONTROL"></a> ACTION_DO_CONTROL | `uint8` | 1 | enable actuator test mode |
| <a id="#FUNCTION_MOTOR1"></a> FUNCTION_MOTOR1 | `uint8` | 101 |
| <a id="#MAX_NUM_MOTORS"></a> MAX_NUM_MOTORS | `uint8` | 12 |
| <a id="#FUNCTION_SERVO1"></a> FUNCTION_SERVO1 | `uint8` | 201 |
| <a id="#MAX_NUM_SERVOS"></a> MAX_NUM_SERVOS | `uint8` | 8 |
| <a id="#ORB_QUEUE_LENGTH"></a> ORB_QUEUE_LENGTH | `uint8` | 16 | >= MAX_NUM_MOTORS to support code in esc_calibration |
## Source Message
[Source file (GitHub)](https://github.com/PX4/PX4-Autopilot/blob/main/msg/ActuatorTest.msg)
::: details Click here to see original file
```c
uint64 timestamp # time since system start (microseconds)
# Topic to test individual actuator output functions
uint8 ACTION_RELEASE_CONTROL = 0 # exit test mode for the given function
uint8 ACTION_DO_CONTROL = 1 # enable actuator test mode
uint8 FUNCTION_MOTOR1 = 101
uint8 MAX_NUM_MOTORS = 12
uint8 FUNCTION_SERVO1 = 201
uint8 MAX_NUM_SERVOS = 8
uint8 action # one of ACTION_*
uint16 function # actuator output function
float32 value # range: [-1, 1], where 1 means maximum positive output,
# 0 to center servos or minimum motor thrust,
# -1 maximum negative (if not supported by the motors, <0 maps to NaN),
# and NaN maps to disarmed (stop the motors)
uint32 timeout_ms # timeout in ms after which to exit test mode (if 0, do not time out)
uint8 ORB_QUEUE_LENGTH = 16 # >= MAX_NUM_MOTORS to support code in esc_calibration
```
:::