Tasmota/tasmota/xsns_45_vl53l0x.ino

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/*
xsns_99_vl53l0x.ino - VL53L0X support for Tasmota
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Copyright (C) 2018 Theo Arends and Gerhard Mutz
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_I2C
#ifdef USE_VL53L0X
#define XSNS_45 45
#define XI2C_31 31 // See I2CDEVICES.md
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#include <Wire.h>
#include "VL53L0X.h"
VL53L0X sensor;
uint8_t vl53l0x_ready = 0;
uint16_t vl53l0x_distance;
uint16_t Vl53l0_buffer[5];
uint8_t Vl53l0_index;
/********************************************************************************************/
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void Vl53l0Detect(void)
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{
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if (!I2cSetDevice(0x29)) { return; }
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if (!sensor.init()) { return; }
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I2cSetActiveFound(sensor.getAddress(), "VL53L0X");
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sensor.setTimeout(500);
// Start continuous back-to-back mode (take readings as
// fast as possible). To use continuous timed mode
// instead, provide a desired inter-measurement period in
// ms (e.g. sensor.startContinuous(100)).
sensor.startContinuous();
vl53l0x_ready = 1;
Vl53l0_index=0;
}
#ifdef USE_WEBSERVER
const char HTTP_SNS_VL53L0X[] PROGMEM =
"{s}VL53L0X " D_DISTANCE "{m}%d" D_UNIT_MILLIMETER "{e}"; // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
#endif // USE_WEBSERVER
#define USE_VL_MEDIAN
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void Vl53l0Every_250MSecond(void)
{
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uint16_t tbuff[5],tmp;
uint8_t flag;
// every 200 ms
uint16_t dist = sensor.readRangeContinuousMillimeters();
if (dist==0 || dist>2000) {
dist=9999;
}
#ifdef USE_VL_MEDIAN
// store in ring buffer
Vl53l0_buffer[Vl53l0_index]=dist;
Vl53l0_index++;
if (Vl53l0_index>=5) Vl53l0_index=0;
// sort list and take median
memmove(tbuff,Vl53l0_buffer,sizeof(tbuff));
for (byte ocnt=0; ocnt<5; ocnt++) {
flag=0;
for (byte count=0; count<4; count++) {
if (tbuff[count]>tbuff[count+1]) {
tmp=tbuff[count];
tbuff[count]=tbuff[count+1];
tbuff[count+1]=tmp;
flag=1;
}
}
if (!flag) break;
}
vl53l0x_distance=tbuff[2];
#else
vl53l0x_distance=dist;
#endif
}
void Vl53l0Show(boolean json)
{
if (json) {
ResponseAppend_P(PSTR(",\"VL53L0X\":{\"" D_JSON_DISTANCE "\":%d}"), vl53l0x_distance);
#ifdef USE_WEBSERVER
} else {
WSContentSend_PD(HTTP_SNS_VL53L0X, vl53l0x_distance);
#endif
}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xsns45(byte function)
{
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if (!I2cEnabled(XI2C_31)) { return false; }
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bool result = false;
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if (FUNC_INIT == function) {
Vl53l0Detect();
}
else if (vl53l0x_ready) {
switch (function) {
case FUNC_EVERY_250_MSECOND:
Vl53l0Every_250MSecond();
break;
case FUNC_JSON_APPEND:
Vl53l0Show(1);
break;
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#ifdef USE_WEBSERVER
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case FUNC_WEB_SENSOR:
Vl53l0Show(0);
break;
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#endif // USE_WEBSERVER
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}
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}
return result;
}
#endif // USE_VL53L0X
#endif // USE_I2C