SM_PWM_01C dust sensor

Driver for Amphenol SM_PWM_01C infrared dust sensor. More...

Detailed Description

Driver for Amphenol SM_PWM_01C infrared dust sensor.

* About

This driver provides an interface for the Amphenol SM-PWM-Sensor. The Datasheet can be found here. and the more complete application note here

The device can measure small particles (1~ 2μm) and large particle (3 ~10μm), so similar to PM2.5 and PM10. The dust sensor cannot count particles only measure estimated concentrations.

It is recommended to compute values over a 30s moving average. By default a moving average is used since the module MODULE_SM_PWM_01C_MA is activated by default. To save memory an exponential average can be used by disabling this module.

Topics
	SM_PWM_01C compile configurations

Files
file	sm_pwm_01c.h
	SM_PWM_01C Device Driver.
file	sm_pwm_01c_params.h
	Default configuration for SM_PWM_01C driver.

Data Structures
struct	circ_buf_t
	Circular buffer holding moving average values. More...
struct	sm_pwm_01c_params_t
	Parameters for the SM_PWM_01c sensor. More...
struct	sm_pwm_01c_data_t
	LPO and concentration (ug/m3) values for small and large particles. More...
struct	sm_pwm_01c_values_t
	LPO and concentration (ug/m3) values for small and large particles. More...
struct	sm_pwm_01c_t
	Device descriptor for the SM_PWM_01c sensor. More...

Functions
int	sm_pwm_01c_init (sm_pwm_01c_t *dev, const sm_pwm_01c_params_t *params)
	Initialize the given SM_PWM_01C device.
void	sm_pwm_01c_start (sm_pwm_01c_t *dev)
	Start continuous measurement of Large and Small particle concentrations.
void	sm_pwm_01c_stop (sm_pwm_01c_t *dev)
	Stops continuous measurement of Large and Small particle concentration.
void	sm_pwm_01c_read_data (sm_pwm_01c_t *dev, sm_pwm_01c_data_t *data)
	Reads particle concentration values.

Function Documentation

sm_pwm_01c_init()

int sm_pwm_01c_init	(	sm_pwm_01c_t *	dev,
		const sm_pwm_01c_params_t *	params )

Initialize the given SM_PWM_01C device.

Parameters

[out]	dev	Initialized device descriptor of SM_PWM_01C device
[in]	params	The parameters for the SM_PWM_01C device

Return values

0	on success
-EIO	GPIO error

sm_pwm_01c_read_data()

void sm_pwm_01c_read_data	(	sm_pwm_01c_t *	dev,
		sm_pwm_01c_data_t *	data )

Reads particle concentration values.

Parameters

[in]	dev	Device descriptor of SM_PWM_01C device
[out]	data	Pre-allocated memory to hold measured concentrations

sm_pwm_01c_start()

void sm_pwm_01c_start

(

sm_pwm_01c_t *

dev

)

Start continuous measurement of Large and Small particle concentrations.

Parameters

[in]

dev

Device descriptor of SM_PWM_01C device

sm_pwm_01c_stop()

void sm_pwm_01c_stop

(

sm_pwm_01c_t *

dev

)

Stops continuous measurement of Large and Small particle concentration.

Parameters

[in]

dev

Device descriptor of SM_PWM_01C device