hx711 module

Reading of multiple HX711 strain gauge sensors.

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="hx711">
  b'<define name="HX711_GAIN" value="1" />\n\n    '
  b'<define name="HX711_PWM_FREQUENCY" value="6000000" />\n    '
  b'<define name="HX711_DEVICES_NB" value="4" />\n    '
  b'<define name="HX711_DEVICES" value="{{port,pin,0},{port,pin,0},{port,pin,0},{port,pin,0}}" />\n  '
  b'<configure name="HX711_CLOCK" default="PWM_SERVO_1" />\n    '
</module>

Module configuration options

Configure Options

• name: HX711_CLOCK value: None
  Description: PWM to use for the clock

Define Options

• name: HX711_GAIN value: 1
  Description: The gain of the sensor in pulses (128: 1)
• name: HX711_PWM_FREQUENCY value: 6000000
  Description: Frequency of the generated PWM signal for clock precision of 0.5MHz
• name: HX711_DEVICES_NB value: 4
  Description: The amount of sensors to read
• name: HX711_DEVICES value: {{port,pin,0},{port,pin,0},{port,pin,0},{port,pin,0}}
  Description: The list of sensor port/pin pairs to read

Module functions

Init Functions

These initialization functions are called once on startup.

• hx711_init()

Event Functions

These event functions are called in each cycle of the module event loop.

• hx711_event()

Files

Header Files

The following headers are automatically included in modules.h

• hx711.h

Source Files

• arch dependent: modules/sensors/hx711.c

Raw hx711.xml file:

<!DOCTYPE module SYSTEM "module.dtd">
 
<module name="hx711" dir="sensors">
  <doc>
    <description>
      Reading of multiple HX711 strain gauge sensors.
    </description>
    <define name="HX711_GAIN" value="1" description="The gain of the sensor in pulses (128: 1)"/>
 
    <define name="HX711_PWM_FREQUENCY" value="6000000" description="Frequency of the generated PWM signal for clock precision of 0.5MHz"/>
    <configure name="HX711_CLOCK" default="PWM_SERVO_1" description="PWM to use for the clock"/>
    <define name="HX711_DEVICES_NB" value="4" description="The amount of sensors to read"/>
    <define name="HX711_DEVICES" value="{{port,pin,0},{port,pin,0},{port,pin,0},{port,pin,0}}" description="The list of sensor port/pin pairs to read"/>
  </doc>
  <header>
    <file name="hx711.h"/>
  </header>
 
  <init fun="hx711_init()"/>
  <event fun="hx711_event()"/>
 
  <makefile target="ap">
    <configure name="HX711_CLOCK" default="PWM_SERVO_1"/>
    <define name="HX711_PWM_PORT" value="$(HX711_CLOCK)_GPIO"/>
    <define name="HX711_PWM_PIN" value="$(HX711_CLOCK)_PIN"/>
    <define name="HX711_PWM_AF" value="$(HX711_CLOCK)_AF"/>
    <define name="HX711_PWM_CHANNEL" value="$(HX711_CLOCK)_CHANNEL"/>
    <define name="HX711_PWM_DRIVER" value="$(HX711_CLOCK)_DRIVER"/>
 
    <file_arch name="hx711.c"/>
  </makefile>
</module>