aoa_pwm module

Angle of Attack sensor using PWM input

No detailed description...

Example for airframe file

Add to your firmware section: This example contains all possible configuration options, not all of them are mandatory!

<module name="pwm_meas"/>
<module name="AOA_pwm">
  <define name="AOA_SENS" value="(2*3.14)/AOA_PWM_PERIOD" />
  <define name="AOA_OFFSET" value="0." />
  <define name="AOA_ANGLE_OFFSET" value="3.14" />
  <define name="AOA_REVERSE" value="TRUE|FALSE" />
  <define name="AOA_PWM_PERIOD" value="4096" />
  <define name="AOA_PWM_OFFSET" value="1" />
  <define name="SEND_AOA" value="TRUE|FALSE" />
  <define name="LOG_AOA" value="TRUE|FALSE" />
  <configure name="AOA_PWM_CHANNEL" value="PWM_INPUTX" />
</module>

Module configuration options

Configure Options

• name: AOA_PWM_CHANNEL value: PWM_INPUTX
  Description: Select PWM input channel for AOA sensor

Define Options

• name: AOA_SENS value: (2*3.14)/AOA_PWM_PERIOD
  Description: sensor sensitivity
• name: AOA_OFFSET value: 0.
  Description: offset in radian that can be set from settings
• name: AOA_ANGLE_OFFSET value: 3.14
  Description: global offset in radian corresponding to the sensor mounting (default: 3.14)
• name: AOA_REVERSE value: TRUE|FALSE
  Description: set to TRUE to reverse rotation direction
• name: AOA_PWM_PERIOD value: 4096
  Description: period in microsec (e.g. 4096 for 12 bits sensor)
• name: AOA_PWM_OFFSET value: 1
  Description: initial offset on the raw pwm signal if needed (default: 1usec)
• name: SEND_AOA value: TRUE|FALSE
  Description: enable telemetry report (default: TRUE)
• name: LOG_AOA value: TRUE|FALSE
  Description: enable logging on SD card (default: FALSE)

Dependencies

• pwm_meas module

Module functions

Init Functions

These initialization functions are called once on startup.

• aoa_pwm_init()

Periodic Functions

These functions are called periodically at the specified frequency from the module periodic loop.

• aoa_pwm_update()
  • Frequency in Hz: 20
  • Autorun: LOCK
    Periodic function automatically starts after init and can't be stopped.

Files

Header Files

The following headers are automatically included in modules.h

• aoa_pwm.h

Source Files

• modules/sensors/aoa_pwm.c

Raw AOA_pwm.xml file:

<!DOCTYPE module SYSTEM "module.dtd">

<module name="AOA_pwm" dir="sensors">
  <doc>
    <description> Angle of Attack sensor using PWM input</description>
    <configure name="AOA_PWM_CHANNEL" value="PWM_INPUTX" description="Select PWM input channel for AOA sensor"/>
    <define name="AOA_SENS" value="(2*3.14)/AOA_PWM_PERIOD" description="sensor sensitivity"/>
    <define name="AOA_OFFSET" value="0."  description="offset in radian that can be set from settings"/>
    <define name="AOA_ANGLE_OFFSET" value="3.14"  description="global offset in radian corresponding to the sensor mounting (default: 3.14)"/>
    <define name="AOA_REVERSE" value="TRUE|FALSE" description="set to TRUE to reverse rotation direction"/>
    <define name="AOA_PWM_PERIOD" value="4096" description="period in microsec (e.g. 4096 for 12 bits sensor)"/>
    <define name="AOA_PWM_OFFSET" value="1" description="initial offset on the raw pwm signal if needed (default: 1usec)"/>
    <define name="SEND_AOA" value="TRUE|FALSE" description="enable telemetry report (default: TRUE)"/>
    <define name="LOG_AOA" value="TRUE|FALSE" description="enable logging on SD card (default: FALSE)"/>
  </doc>
  <settings>
    <dl_settings>
      <dl_settings NAME="AOA">
        <dl_setting MAX="180" MIN="-180" STEP="0.1" VAR="aoa_pwm.offset" shortname="AOA_offset" module="modules/sensors/aoa_pwm" param="AOA_OFFSET" unit="rad" alt_unit="deg"/>
        <dl_setting MAX="0.95" MIN="0" STEP="0.001" VAR="aoa_pwm.filter" shortname="AOA_filter" module="modules/sensors/aoa_pwm" param="AOA_FILTER"/>
      </dl_settings>
    </dl_settings>
  </settings>

  <depends>pwm_meas</depends>
  <header>
    <file name="aoa_pwm.h" />
  </header>

  <init fun="aoa_pwm_init()" />
  <periodic fun="aoa_pwm_update()" freq="20" />

  <makefile target="ap">
    <file name="aoa_pwm.c" />
    <define name="AOA_PWM_CHANNEL" value="$(AOA_PWM_CHANNEL)" cond="ifdef AOA_PWM_CHANNEL" />
    <define name="$(AOA_PWM_CHANNEL)_TICKS_PER_USEC" value="1" />
    <define name="USE_$(AOA_PWM_CHANNEL)" value="PWM_PULSE_TYPE_ACTIVE_LOW" />
  </makefile>
</module>