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Tasmota/tasmota/xsns_45_vl53l0x.ino

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/*
xsns_45_vl53l0x.ino - VL53L0X time of flight multiple sensors support for Tasmota
Copyright (C) 2021 Theo Arends, Gerhard Mutz and Adrian Scillato
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
/*********************************************************************************************\
* VL53L0x time of flight sensor
*
* I2C Addres: 0x29
*********************************************************************************************
*
* Note: When using multiple VL53L0X, it is required to also wire the XSHUT pin of all those sensors
* in order to let Tasmota change by software the I2C address of those and give them an unique address
* for operation. The sensor don't save its address, so this procedure of changing its address is needed
* to be performed every restart. The Addresses used for this are 120 (0x78) to 127 (0x7F). In the I2c
* Standard (https://i2cdevices.org/addresses) those addresses are used by the PCA9685, so take into
* account they won't work together.
*
* The default value of VL53L0X_MAX_SENSORS is set in the file tasmota.h
* Changing that is backwards incompatible - Max supported devices by this driver are 8
*
**********************************************************************************************
*
* How to install this sensor: https://www.st.com/resource/en/datasheet/vl53l0x.pdf
*
* If you are going to use long I2C wires read this:
* https://hackaday.com/2017/02/08/taking-the-leap-off-board-an-introduction-to-i2c-over-long-wires/
*
\*********************************************************************************************/
#define XSNS_45 45
#define XI2C_31 31 // See I2CDEVICES.md
// Uncomment this line to use long range mode. This
// increases the sensitivity of the sensor and extends its
// potential range, but increases the likelihood of getting
// an inaccurate reading because of reflections from objects
// other than the intended target. It works best in dark
// conditions.
//#define VL53L0X_LONG_RANGE
// Uncomment ONE of these two lines to get
// - higher speed at the cost of lower accuracy OR
// - higher accuracy at the cost of lower speed
//#define VL53L0X_HIGH_SPEED
//#define VL53L0X_HIGH_ACCURACY
#define USE_VL_MEDIAN
#define USE_VL_MEDIAN_SIZE 5 // Odd number of samples median detection
#include <Wire.h>
#include "VL53L0X.h"
VL53L0X sensor[VL53L0X_MAX_SENSORS];
struct {
uint16_t distance;
uint16_t distance_prev;
uint16_t buffer[5];
uint8_t ready = 0;
uint8_t index;
} Vl53l0x[VL53L0X_MAX_SENSORS];
bool xshut = false;
bool VL53L0X_detected = false;
/********************************************************************************************/
void Vl53l0Detect(void) {
for (uint32_t i = 0; i < VL53L0X_MAX_SENSORS; i++) {
if (PinUsed(GPIO_VL53L0X_XSHUT1, i)) {
pinMode(Pin(GPIO_VL53L0X_XSHUT1, i), OUTPUT);
digitalWrite(Pin(GPIO_VL53L0X_XSHUT1, i), i==0 ? 1 : 0);
xshut = true;
}
}
for (uint32_t i = 0; i < VL53L0X_MAX_SENSORS; i++) {
if (PinUsed(GPIO_VL53L0X_XSHUT1, i) || (!xshut)) {
if (xshut) { pinMode(Pin(GPIO_VL53L0X_XSHUT1, i), INPUT); delay(1); }
if (!I2cSetDevice(0x29) && !I2cSetDevice((uint8_t)(120+i))) { return; } // Detection for unconfigured OR configured sensor
if (sensor[i].init()) {
if (xshut) { sensor[i].setAddress((uint8_t)(120+i)); }
uint8_t addr = sensor[i].getAddress();
if (xshut) {
I2cSetActive(addr);
AddLog(LOG_LEVEL_DEBUG, PSTR(D_LOG_I2C D_SENSOR " VL53L0X %d " D_SENSOR_DETECTED " - " D_NEW_ADDRESS " 0x%02X"), i+1, addr);
} else {
I2cSetActiveFound(addr, "VL53L0X");
}
sensor[i].setTimeout(500);
#if defined VL53L0X_LONG_RANGE
// lower the return signal rate limit (default is 0.25 MCPS)
sensor[i].setSignalRateLimit(0.1);
// increase laser pulse periods (defaults are 14 and 10 PCLKs)
sensor[i].setVcselPulsePeriod(VL53L0X::VcselPeriodPreRange, 18);
sensor[i].setVcselPulsePeriod(VL53L0X::VcselPeriodFinalRange, 14);
#endif
#if defined VL53L0X_HIGH_SPEED
// reduce timing budget to 20 ms (default is about 33 ms)
sensor[i].setMeasurementTimingBudget(20000);
#elif defined VL53L0X_HIGH_ACCURACY
// increase timing budget to 200 ms
sensor[i].setMeasurementTimingBudget(200000);
#endif
// 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[i].startContinuous();
Vl53l0x[i].ready = 1;
Vl53l0x[i].index = 0;
VL53L0X_detected = true;
if (!xshut) { break; }
} else {
AddLog(LOG_LEVEL_DEBUG, PSTR(D_LOG_I2C D_SENSOR " VL53L0X %d - " D_FAILED_TO_START), i+1);
}
}
}
}
void Vl53l0Every_250MSecond(void) {
for (uint32_t i = 0; i < VL53L0X_MAX_SENSORS; i++) {
if (PinUsed(GPIO_VL53L0X_XSHUT1, i) || (!xshut)) {
uint16_t dist = sensor[i].readRangeContinuousMillimeters();
if ((0 == dist) || (dist > 2200)) {
dist = 9999;
}
#ifdef USE_VL_MEDIAN
// store in ring buffer
Vl53l0x[i].buffer[Vl53l0x[i].index] = dist;
Vl53l0x[i].index++;
if (Vl53l0x[i].index >= USE_VL_MEDIAN_SIZE) {
Vl53l0x[i].index = 0;
}
// sort list and take median
uint16_t tbuff[USE_VL_MEDIAN_SIZE];
memmove(tbuff, Vl53l0x[i].buffer, sizeof(tbuff));
uint16_t tmp;
uint8_t flag;
for (uint32_t ocnt = 0; ocnt < USE_VL_MEDIAN_SIZE; ocnt++) {
flag = 0;
for (uint32_t count = 0; count < USE_VL_MEDIAN_SIZE -1; 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[i].distance = tbuff[(USE_VL_MEDIAN_SIZE -1) / 2];
#else
Vl53l0x[i].distance = dist;
#endif
}
if (!xshut) { break; }
}
}
#ifdef USE_DOMOTICZ
void Vl53l0Every_Second(void) {
if (abs(Vl53l0x[0].distance - Vl53l0x[0].distance_prev) > 8) {
Vl53l0x[0].distance_prev = Vl53l0x[0].distance;
DomoticzSensor(DZ_ILLUMINANCE, Vl53l0x[0].distance);
}
}
#endif // USE_DOMOTICZ
void Vl53l0Show(boolean json) {
for (uint32_t i = 0; i < VL53L0X_MAX_SENSORS; i++) {
if (PinUsed(GPIO_VL53L0X_XSHUT1, i) || (!xshut)) {
if (json) {
if (Vl53l0x[i].distance == 9999) {
if (xshut) {
ResponseAppend_P(PSTR(",\"VL53L0X_%d\":{\"" D_JSON_DISTANCE "\":null}"), i+1);
} else {
ResponseAppend_P(PSTR(",\"VL53L0X\":{\"" D_JSON_DISTANCE "\":null}")); // For backwards compatibility when not using XSHUT GPIOs
}
} else {
if (xshut) {
ResponseAppend_P(PSTR(",\"VL53L0X_%d\":{\"" D_JSON_DISTANCE "\":%d}"), i+1, Vl53l0x[i].distance);
} else {
ResponseAppend_P(PSTR(",\"VL53L0X\":{\"" D_JSON_DISTANCE "\":%d}"), Vl53l0x[i].distance); // For backwards compatibility when not using XSHUT GPIOs
}
}
#ifdef USE_WEBSERVER
} else {
if (Vl53l0x[i].distance == 9999) {
if (xshut) {
WSContentSend_PD("{s}%s_%d " D_DISTANCE "{m}%s {e}", PSTR("VL53L0X"), i+1, PSTR(D_OUT_OF_RANGE));
} else {
WSContentSend_PD("{s}%s " D_DISTANCE "{m}%s {e}", PSTR("VL53L0X"), PSTR(D_OUT_OF_RANGE)); // For backwards compatibility when not using XSHUT GPIOs
}
} else {
if (xshut) {
WSContentSend_PD("{s}%s_%d " D_DISTANCE "{m}%d " D_UNIT_MILLIMETER "{e}", PSTR("VL53L0X"), i+1, Vl53l0x[i].distance);
} else {
WSContentSend_PD(HTTP_SNS_DISTANCE, PSTR("VL53L0X"), Vl53l0x[i].distance); // For backwards compatibility when not using XSHUT GPIOs
}
}
#endif
}
}
if (sensor[i].timeoutOccurred()) { AddLog(LOG_LEVEL_DEBUG, PSTR(D_LOG_I2C D_TIMEOUT_WAITING_FOR D_SENSOR " VL53L0X %d"), i+1); }
if (!xshut) { break; }
}
#ifdef USE_DOMOTICZ
if ((json) && (0 == TasmotaGlobal.tele_period)){
DomoticzSensor(DZ_ILLUMINANCE, Vl53l0x[0].distance);
}
#endif // USE_DOMOTICZ
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xsns45(byte function) {
if (!I2cEnabled(XI2C_31)) { return false; }
bool result = false;
if (FUNC_INIT == function) {
Vl53l0Detect();
}
else if (VL53L0X_detected) {
switch (function) {
case FUNC_EVERY_250_MSECOND:
Vl53l0Every_250MSecond();
break;
#ifdef USE_DOMOTICZ
case FUNC_EVERY_SECOND:
Vl53l0Every_Second();
break;
#endif // USE_DOMOTICZ
case FUNC_JSON_APPEND:
Vl53l0Show(1);
break;
#ifdef USE_WEBSERVER
case FUNC_WEB_SENSOR:
Vl53l0Show(0);
break;
#endif // USE_WEBSERVER
}
}
return result;
}
#endif // USE_VL53L0X
#endif // USE_I2C
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