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Tasmota/tasmota/tasmota_xsns_sensor/xsns_23_me007.ino

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/*
xsns_23_me007ula.ino - ME007 ultrasonic sensor support for Tasmota
Copyright (C) 2022 Mathias Buder
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef USE_ME007
/*********************************************************************************************\
* ME007 - Ultrasonic distance sensor
*
* Code for ME007 family of ultrasonic distance sensors
* References:
* - https://wiki.dfrobot.com/Water-proof%20Ultrasonic%20Sensor%20(ULS)%20%20SKU:%20SEN0300
\*********************************************************************************************/
/*********************************************************************************************/
/* Includes*/
/*********************************************************************************************/
#include <TasmotaSerial.h>
/*********************************************************************************************/
/* Defines */
/*********************************************************************************************/
#define XSNS_23 23
#define ME007_VERSION "1.0.0" /**< Driver version X.Y.Z: X:Major, Y: Minor, Z: Patch */
#define ME007_DEBUG_MSG_TAG "ME7: "
#define ME007_WS_MQTT_MSG_TAG "ME7"
#define ME007_SENSOR_ERROR_CNT_CURRENT_TAG "ErrorCounterCurrent"
#define ME007_SENSOR_ERROR_CNT_TOTAL_TAG "ErrorCounterTotal"
#define ME007_SENSOR_VERSION_TAG "DriverVersion"
#define ME007_MIN_SENSOR_DISTANCE 30U /**< Minimum measurement distance @unit cm */
#ifndef ME007_MAX_SENSOR_DISTANCE
#define ME007_MAX_SENSOR_DISTANCE 800U /**< Maximum measurement distance @unit cm */
#endif
#define ME007_SERIAL_IF_BAUD_RATE 9600U /**< Serial interface baud rate @unit Baud */
#define ME007_SERIAL_SOF 0xFF /**< Start of frame indicator (header) */
#define ME007_SERIAL_FRAME_SIZE 6U /**< Total frame size: Header (1Byte) + Distance (2 byte) + Temperature (2 byte) + Checksum (1 byte) = 6 byte */
#define ME007_SERIAL_MAX_WAIT_TIME 120U /**< Max. wait time for data after trigger signal @unit ms */
#define ME007_SERIAL_MAX_DATA_RECEIVE_TIME 500U /**< Max. time to receive entire data frame @unit ms */
#define ME007_TRIG_SIG_DURATION_MS 1U /**< Time duration of trigger low-pulse @unit ms */
#define ME007_MEDIAN_FILTER_SIZE 5U /**< Median filter samples, must be an odd number @unit sample */
#define ME007_MEDIAN_FILTER_MEDIAN_IDX ( ( uint8_t )( ME007_MEDIAN_FILTER_SIZE - 1U) / 2U ) /**< Median filter samples @unit sample */
#define ME007_MEDIAN_FILTER_MEASURE_DELAY 30U /**< Small delay between consecutive measurements @unit ms */
#define ME007_SENSOR_NUM_ERROR 10U /**< Number of tries to detect sensor */
/*********************************************************************************************/
/* Enums */
/*********************************************************************************************/
/**
* @details Sensor readings type
*/
enum ME007_SHOW_TYPE
{
ME007_SHOW_TYPE_JS = 0U, /**< @details Domain log message tag string */
ME007_SHOW_TYPE_WS
};
/**
* @details Sensor serial interface mode type
*/
typedef enum ME007_SERIAL_RECEIVE_TYPE_TAG
{
ME007_SERIAL_RECEIVE_TYPE_SOF = 0U, /**< @details Receive Start-Of-Frame character */
ME007_SERIAL_RECEIVE_TYPE_DATA /**< @details Receive data (distance + temperature + checksum) */
} ME007_SERIAL_RECEIVE_TYPE;
/**
* @details Sensor serial interface byte type
*/
enum ME007_SERIAL_BYTE_TYPE
{
ME007_SERIAL_BYTE_TYPE_SOF = 0U, /**< @details Receive Start-Of-Frame character */
ME007_SERIAL_BYTE_TYPE_DIST_H, /**< @details Distance MSB */
ME007_SERIAL_BYTE_TYPE_DIST_L, /**< @details Distance LSB */
ME007_SERIAL_BYTE_TYPE_TEMP_H, /**< @details Temperature MSB */
ME007_SERIAL_BYTE_TYPE_TEMP_L, /**< @details Temperature LSB */
ME007_SERIAL_BYTE_TYPE_CHECKSUM /**< @details Frame checksum */
};
/**
* @details Global sensor error type
*/
typedef enum ME007_ERROR_TYPE_TAG
{
ME007_ERROR_TYPE_NONE = 0U, /**< @details No error present */
ME007_ERROR_TYPE_TIMEOUT, /**< @details Serial frame not receive in time */
ME007_ERROR_TYPE_CRC /**< @details Checksum calculate/compare failed */
} ME007_ERROR_TYPE;
/**
* @details Global sensor state type
*/
typedef enum ME007_STATE_TYPE_TAG
{
ME007_STATE_NOT_DETECTED = 0U, /**< @details Sensor not detected */
ME007_STATE_DETECTED /**< @details Sensor detected */
} ME007_STATE_TYPE;
/*********************************************************************************************/
/* Structures */
/*********************************************************************************************/
/**
* @details Global sensor data structure
*/
struct
{
uint8_t pin_rx_u8; /**< @details Serial interface receive pin */
uint8_t pin_trig_u8; /**< @details Sensor trigger pin */
ME007_STATE_TYPE state_e; /**< @details Global sensor state */
float distance_cm_f32; /**< @details Output distance measurement @unit cm */
float temperature_deg_f32; /**< @details Output temperature measurement @unit °C */
uint8_t error_cnt_current_u8; /**< @details Measurement error counter (current) */
uint16_t error_cnt_total_u16; /**< @details Measurement error counter (total) */
} me007_data_s;
/*********************************************************************************************/
/* Global Variables */
/*********************************************************************************************/
TasmotaSerial* gp_serial_if = nullptr; /**< @details Pointer to serial interface object */
/*********************************************************************************************/
/* Function Prototypes */
/*********************************************************************************************/
/**
* @details This function initializes the sensor driver and its underlying serial interface.
*/
void me007_init( void );
/**
* @details This function performs a single distance/temperature measurement.
* @param[out] float* p_distance_cm_f32 Pointer to variable supposed to store the current distance reading.
* @param[out] float* p_temperature_f32 Pointer to variable supposed to store the current temperature reading.
* @return ME007_ERROR_TYPE Status of current measurement.
*/
ME007_ERROR_TYPE me007_measure( float* const p_distance_cm_f32, float* const p_temperature_f32 );
/**
* @details This function sorts a list if float values in ascending order.
* @param[in] const void* p_list Pointer to list to be sorted
* @param[in] const uint8_t size_u8 Size of list to be sorted.
*/
#ifdef ME007_ENABLE_MEDIAN_FILTER
void me007_sort_asc( float* const p_list, const uint8_t size_u8 );
#endif
/**
* @details This function performs multiple sensor measurements and filters the output if enables.
*/
void me007_read_value( void );
/**
* @details This function sends the current distance/temperature measurements to the web-interface / MQTT / Domoticz.
* @param[in] ME007_SHOW_TYPE type_e Variable to decide where to output the sensor measurements.
*/
void me007_show( const ME007_SHOW_TYPE type_e );
/*********************************************************************************************/
/* Function Definitions */
/*********************************************************************************************/
void me007_init( void )
{
AddLog( LOG_LEVEL_INFO, PSTR( ME007_DEBUG_MSG_TAG "Initializing ..." ) );
/* Check if sensor pins are selected/used in web-interface */
if ( ( false == PinUsed( GPIO_ME007_TRIG ) )
|| ( false == PinUsed( GPIO_ME007_RX ) ) )
{
AddLog( LOG_LEVEL_ERROR, PSTR( ME007_DEBUG_MSG_TAG "Serial/Trigger interface not configured" ) );
return;
}
/* Init some global sensor data structure elements */
me007_data_s.state_e = ME007_STATE_NOT_DETECTED;
me007_data_s.error_cnt_current_u8 = 0U;
me007_data_s.error_cnt_total_u16 = 0U;
/* Store real pin number */
me007_data_s.pin_rx_u8 = Pin( GPIO_ME007_RX );
me007_data_s.pin_trig_u8 = Pin( GPIO_ME007_TRIG );
DEBUG_SENSOR_LOG( PSTR( ME007_DEBUG_MSG_TAG "Using GPIOs: Trigger: %i / Rx: %i)" ),
me007_data_s.pin_trig_u8,
me007_data_s.pin_rx_u8 );
/* Configure serial interface */
/* Only Rx pin is required as ME007 is controlled using its trigger pin. Therefore, passing value "-1" as transmit_pin argument */
gp_serial_if = new TasmotaSerial( me007_data_s.pin_rx_u8, -1, 2U );
if ( ( nullptr != gp_serial_if )
&& ( true == gp_serial_if->begin( ME007_SERIAL_IF_BAUD_RATE ) ) )
{
if ( true == gp_serial_if->hardwareSerial() )
{
ClaimSerial();
}
pinMode( me007_data_s.pin_trig_u8, OUTPUT ); /**< @details Configure trigger pin as output */
digitalWrite( me007_data_s.pin_trig_u8, HIGH ); /**< @details Set trigger pin to high-level as it ME007 requires a falling edge to initiate measurement */
/* Detect sensor */
AddLog( LOG_LEVEL_INFO, PSTR( ME007_DEBUG_MSG_TAG "Detecting ..." ) );
for ( uint8_t idx_u8 = 0U; idx_u8 < ME007_SENSOR_NUM_ERROR; ++idx_u8 )
{
ME007_ERROR_TYPE detected_e = me007_measure( &me007_data_s.distance_cm_f32,
&me007_data_s.temperature_deg_f32 );
if ( ME007_ERROR_TYPE_NONE == detected_e )
{
me007_data_s.state_e = ME007_STATE_DETECTED;
break;
}
else
{
DEBUG_SENSOR_LOG( PSTR( ME007_DEBUG_MSG_TAG "Measurement error: %i" ), idx_u8 );
}
}
AddLog( LOG_LEVEL_INFO, PSTR( ME007_DEBUG_MSG_TAG "%s" ), me007_data_s.state_e == ME007_STATE_DETECTED ? "Detected" : "Not detected, Sensor deactivated" );
}
else
{
AddLog( LOG_LEVEL_ERROR, PSTR( ME007_DEBUG_MSG_TAG "Serial interface unavailable" ) );
}
}
ME007_ERROR_TYPE me007_measure( float* const p_distance_cm_f32, float* const p_temperature_f32 )
{
ME007_SERIAL_RECEIVE_TYPE state_e = ME007_SERIAL_RECEIVE_TYPE_SOF; /**< @details Always start trying to receive SOF */
uint8_t buffer_vu8[ME007_SERIAL_FRAME_SIZE] = {0U};
uint8_t buffer_idx_u8 = 0U;
uint8_t data_byte_u8 = 0U;
uint32_t timestamp_ms_u32 = 0U;
if ( ( nullptr != p_distance_cm_f32 )
&& ( nullptr != p_temperature_f32 )
&& ( nullptr != gp_serial_if ) )
{
/* Trigger new sensor measurement */
digitalWrite( me007_data_s.pin_trig_u8, LOW );
timestamp_ms_u32 = millis(); /**< @details Store trigger time */
DEBUG_SENSOR_LOG( PSTR( ME007_DEBUG_MSG_TAG "Sensor reading triggered" ) );
delay( ME007_TRIG_SIG_DURATION_MS ); /**< @details Wait 1ms to give the oin time to go low */
digitalWrite( me007_data_s.pin_trig_u8, HIGH );
/* Give sensor some time to take a measurement and send the result */
/* Max. wait time should be T2max + T3max = 61 ms (see https://wiki.dfrobot.com/Water-proof%20Ultrasonic%20Sensor%20(ULS)%20%20SKU:%20SEN0300, section "Serial Output" for details) */
while ( ( timestamp_ms_u32 + ME007_SERIAL_MAX_WAIT_TIME ) >= millis() )
{
if ( 0U < gp_serial_if->available() )
{
/* Read 1 byte of data */
data_byte_u8 = gp_serial_if->read();
DEBUG_SENSOR_LOG( PSTR( ME007_DEBUG_MSG_TAG "Serial: Byte received: 0x%x" ), data_byte_u8 );
/* Serial Data Frame Layout
+──────────────────+─────────────────────+────────────────────+────────────────────────+───────────────────────+────────────+
| Frame Header ID | Distance Data High | Distance Data Low | Temperature Data High | Temperature Data Low | Checksum |
+──────────────────+─────────────────────+────────────────────+────────────────────────+───────────────────────+────────────+
| 0xFF | Data_H | Data_L | Temp_H | Temp_L | SUM |
+──────────────────+─────────────────────+────────────────────+────────────────────────+───────────────────────+────────────+ */
switch ( state_e )
{
case ME007_SERIAL_RECEIVE_TYPE_SOF:
if ( ME007_SERIAL_SOF == data_byte_u8 )
{
buffer_vu8[buffer_idx_u8++] = data_byte_u8;
state_e = ME007_SERIAL_RECEIVE_TYPE_DATA;
DEBUG_SENSOR_LOG( PSTR( ME007_DEBUG_MSG_TAG "(Idx: %i) Serial: SOF detected" ), buffer_idx_u8 );
}
break;
case ME007_SERIAL_RECEIVE_TYPE_DATA:
buffer_vu8[buffer_idx_u8++] = data_byte_u8;
DEBUG_SENSOR_LOG( PSTR( ME007_DEBUG_MSG_TAG "(Idx: %i) Receiving data: 0x%x" ), buffer_idx_u8, data_byte_u8 );
/* If all bytes have been received: calculate checksum and assembly date */
if ( ME007_SERIAL_FRAME_SIZE <= buffer_idx_u8 )
{
/* Calculate expected checksum (only lower 8 bit shall be used) */
uint8_t checksum_u8 = ( buffer_vu8[ME007_SERIAL_BYTE_TYPE_SOF]
+ buffer_vu8[ME007_SERIAL_BYTE_TYPE_DIST_H]
+ buffer_vu8[ME007_SERIAL_BYTE_TYPE_DIST_L]
+ buffer_vu8[ME007_SERIAL_BYTE_TYPE_TEMP_H]
+ buffer_vu8[ME007_SERIAL_BYTE_TYPE_TEMP_L] ) & 0x00FF;
DEBUG_SENSOR_LOG( PSTR( ME007_DEBUG_MSG_TAG "Comparing expected sum %i to checksum %i" ), checksum_u8, buffer_vu8[ME007_SERIAL_BYTE_TYPE_CHECKSUM] );
/* Compare expected and receive checksum */
if ( checksum_u8 == buffer_vu8[ME007_SERIAL_BYTE_TYPE_CHECKSUM] )
{
/* Assemble and scale distance to cm */
*p_distance_cm_f32 = ( ( buffer_vu8[ME007_SERIAL_BYTE_TYPE_DIST_H] << 8U ) + buffer_vu8[ME007_SERIAL_BYTE_TYPE_DIST_L] ) / 10.0F;
/* Apply physical sensor measurement limits */
if ( ME007_MIN_SENSOR_DISTANCE > *p_distance_cm_f32 )
{
*p_distance_cm_f32 = 0.0F;
}
else if ( ME007_MAX_SENSOR_DISTANCE < *p_distance_cm_f32 )
{
*p_distance_cm_f32 = ME007_MAX_SENSOR_DISTANCE;
}
else
{
/* Ok: Measurement is within the physical sensor measurement limits */
}
/* Assemble and scale temperature °C */
/* Check sign-bit (MSB) */
if ( 0x80 == ( buffer_vu8[ME007_SERIAL_BYTE_TYPE_TEMP_H] & 0x80 ) )
{
buffer_vu8[2U] ^= 0x80;
}
*p_temperature_f32 = ( ( buffer_vu8[ME007_SERIAL_BYTE_TYPE_TEMP_H] << 8U ) + buffer_vu8[ME007_SERIAL_BYTE_TYPE_TEMP_L] ) / 10.0F;
DEBUG_SENSOR_LOG( PSTR( ME007_DEBUG_MSG_TAG "Distance: %s cm, Temperature: %s °C" ),
String( *p_distance_cm_f32, 1U ).c_str(),
String( *p_temperature_f32, 1U ).c_str() );
/* All ok: Measurement valid */
DEBUG_SENSOR_LOG( PSTR( ME007_DEBUG_MSG_TAG "Measurement valid" ) );
return ME007_ERROR_TYPE_NONE;
}
else
{
/* Checksum nok: Measurement invalid */
DEBUG_SENSOR_LOG( PSTR( ME007_DEBUG_MSG_TAG "Checksum nok: Measurement invalid" ) );
return ME007_ERROR_TYPE_CRC;
}
}
break;
default: /* Should never happen */
break;
}
}
}
}
/* Timeout: Measurement invalid */
DEBUG_SENSOR_LOG( PSTR( ME007_DEBUG_MSG_TAG "Timeout: Measurement invalid" ) );
return ME007_ERROR_TYPE_TIMEOUT;
}
#ifdef ME007_ENABLE_MEDIAN_FILTER
void me007_sort_asc( float* const p_list, const uint8_t size_u8 )
{
if( NULL != p_list )
{
for( uint8_t idx_u8 = 0U; idx_u8 < size_u8; ++idx_u8 )
{
for( uint8_t idy_u8 = ( idx_u8 + 1U ); idy_u8 < size_u8; ++idy_u8 )
{
if( p_list[idx_u8] > p_list[idy_u8] )
{
float tmp_f32 = p_list[idx_u8];
p_list[idx_u8] = p_list[idy_u8];
p_list[idy_u8] = tmp_f32;
}
}
}
}
}
#endif
void me007_read_value( void )
{
float distance_cm_f32 = 0.0F;
#ifdef ME007_ENABLE_MEDIAN_FILTER
float distance_buffer_vf32[ME007_MEDIAN_FILTER_SIZE] = {0.0F};
#endif
/* Record some sensor measurements */
#ifdef ME007_ENABLE_MEDIAN_FILTER
for ( uint8_t idx_u8 = 0U; idx_u8 < ME007_MEDIAN_FILTER_SIZE; ++idx_u8 )
{
#endif
ME007_ERROR_TYPE status_e = me007_measure( &distance_cm_f32,
&me007_data_s.temperature_deg_f32 );
switch ( status_e )
{
case ME007_ERROR_TYPE_NONE:
#ifdef ME007_ENABLE_MEDIAN_FILTER
/* Store valid distance measurement into histogram buffer */
distance_buffer_vf32[idx_u8] = distance_cm_f32;
#else
me007_data_s.distance_cm_f32 = distance_cm_f32;
#endif
if ( 0U < me007_data_s.error_cnt_current_u8 )
{
me007_data_s.error_cnt_current_u8--; /* Decrease current measurement errors by one */
}
break;
case ME007_ERROR_TYPE_CRC:
case ME007_ERROR_TYPE_TIMEOUT:
me007_data_s.error_cnt_current_u8++; /* Increase current measurement errors by one */
me007_data_s.error_cnt_total_u16++; /* Store total number of measurement errors */
break;
default: /* Should never happen */
break;
}
/* Check error counter and only print message to error log (for now)
in case error was present for at least ME007_SENSOR_NUM_ERROR cycles.
For some reason, the checksum check fails quite ofter and because
of that it wouldn't make sense to deactivate ME007 in case
ME007_SENSOR_NUM_ERROR is exceeded. */
if ( ME007_SENSOR_NUM_ERROR <= me007_data_s.error_cnt_current_u8 )
{
AddLog( LOG_LEVEL_ERROR, PSTR( ME007_DEBUG_MSG_TAG "Error @ counter: %i" ), me007_data_s.error_cnt_current_u8 );
}
DEBUG_SENSOR_LOG( PSTR( ME007_DEBUG_MSG_TAG "Error counter: Current: %i, Total: %i" ),
me007_data_s.error_cnt_current_u8,
me007_data_s.error_cnt_total_u16 );
#ifdef ME007_ENABLE_MEDIAN_FILTER
/* Add small delay between measurement */
if ( ( ME007_MEDIAN_FILTER_SIZE - 1U ) > idx_u8 )
{
delay( ME007_MEDIAN_FILTER_MEASURE_DELAY );
}
}
/* Sort median filter buffer and assign median value to current distance measurement */
me007_sort_asc( distance_buffer_vf32, ME007_MEDIAN_FILTER_SIZE );
/* Update distance measurement */
me007_data_s.distance_cm_f32 = distance_buffer_vf32[ME007_MEDIAN_FILTER_MEDIAN_IDX];
#endif
}
void me007_show( const ME007_SHOW_TYPE type_e )
{
switch ( type_e )
{
case ME007_SHOW_TYPE_JS:
ResponseAppend_P( PSTR( ",\"" ME007_WS_MQTT_MSG_TAG "\":{\"" D_JSON_DISTANCE "\":%1_f,\"" D_JSON_TEMPERATURE "\":%1_f,\"" ME007_SENSOR_ERROR_CNT_CURRENT_TAG "\":%i,\"" ME007_SENSOR_ERROR_CNT_TOTAL_TAG "\":%i,\"" ME007_SENSOR_VERSION_TAG "\":\"" ME007_VERSION "\"}" ),
&me007_data_s.distance_cm_f32,
&me007_data_s.temperature_deg_f32,
me007_data_s.error_cnt_current_u8,
me007_data_s.error_cnt_total_u16 );
#ifdef USE_DOMOTICZ
if ( 0U == TasmotaGlobal.tele_period )
{
DomoticzFloatSensor( DZ_COUNT, me007_data_s.distance_cm_f32 ); /**< @details Send distance as Domoticz counter value */
DomoticzFloatSensor( DZ_TEMP, me007_data_s.temperature_deg_f32 ); /**< @details Send distance as Domoticz temperature value */
}
#endif /* USE_DOMOTICZ */
break;
#ifdef USE_WEBSERVER
case ME007_SHOW_TYPE_WS:
WSContentSend_PD( HTTP_SNS_F_DISTANCE_CM,
ME007_WS_MQTT_MSG_TAG,
&me007_data_s.distance_cm_f32 );
WSContentSend_PD( HTTP_SNS_F_TEMP,
ME007_WS_MQTT_MSG_TAG,
Settings->flag2.temperature_resolution,
&me007_data_s.temperature_deg_f32 );
break;
#endif /* USE_WEBSERVER */
default: /* Should never happen */
break;
}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xsns23( uint32_t function )
{
bool result_b = false;
switch ( function )
{
case FUNC_INIT:
me007_init();
break;
case FUNC_EVERY_SECOND:
if ( ME007_STATE_DETECTED == me007_data_s.state_e )
{
me007_read_value();
result_b = true;
}
break;
case FUNC_JSON_APPEND:
if ( ME007_STATE_DETECTED == me007_data_s.state_e )
{
me007_show( ME007_SHOW_TYPE_JS );
}
break;
#ifdef USE_WEBSERVER
case FUNC_WEB_SENSOR:
if ( ME007_STATE_DETECTED == me007_data_s.state_e )
{
me007_show( ME007_SHOW_TYPE_WS );
}
break;
#endif // USE_WEBSERVER
}
return result_b;
}
#endif // USE_ME007
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