Tasmota/sonoff/xsns_22_sr04.ino

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/*
xsns_22_sr04.ino - SR04 ultrasonic sensor support for Sonoff-Tasmota
Copyright (C) 2019 Nuno Ferreira and Theo Arends
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_SR04
#include <NewPing.h>
/*********************************************************************************************\
* HC-SR04, HC-SR04+, JSN-SR04T - Ultrasonic distance sensor
*
* Code for SR04 family of ultrasonic distance sensors
* References:
* - https://www.dfrobot.com/wiki/index.php/Weather-proof_Ultrasonic_Sensor_SKU_:_SEN0207
\*********************************************************************************************/
#define XSNS_22 22
uint8_t sr04_echo_pin = 0;
uint8_t sr04_trig_pin = 0;
real64_t distance;
NewPing* sonar = NULL;
2018-12-01 21:15:19 +00:00
void Sr04Init(void)
{
sr04_echo_pin = pin[GPIO_SR04_ECHO];
sr04_trig_pin = pin[GPIO_SR04_TRIG];
sonar = new NewPing(sr04_trig_pin, sr04_echo_pin, 300);
}
#ifdef USE_WEBSERVER
const char HTTP_SNS_DISTANCE[] PROGMEM =
"%s{s}SR04 " D_DISTANCE "{m}%s" D_UNIT_CENTIMETER "{e}"; // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
#endif // USE_WEBSERVER
void Sr04Show(bool json)
{
distance = (real64_t)(sonar->ping_median(5))/ US_ROUNDTRIP_CM;
if (distance != 0) { // Check if read failed
char distance_chr[33];
dtostrfd(distance, 3, distance_chr);
if(json) {
snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s,\"SR04\":{\"" D_JSON_DISTANCE "\":%s}"), mqtt_data, distance_chr);
#ifdef USE_DOMOTICZ
if (0 == tele_period) {
DomoticzSensor(DZ_COUNT, distance_chr); // Send distance as Domoticz Counter value
}
#endif // USE_DOMOTICZ
#ifdef USE_WEBSERVER
} else {
snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_DISTANCE, mqtt_data, distance_chr);
#endif // USE_WEBSERVER
}
}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xsns22(uint8_t function)
{
bool result = false;
if ((pin[GPIO_SR04_ECHO] < 99) && (pin[GPIO_SR04_TRIG] < 99)) {
switch (function) {
case FUNC_INIT:
Sr04Init();
break;
case FUNC_JSON_APPEND:
Sr04Show(1);
break;
#ifdef USE_WEBSERVER
case FUNC_WEB_APPEND:
Sr04Show(0);
break;
#endif // USE_WEBSERVER
}
}
return result;
}
#endif // USE_SR04