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Tasmota/sonoff/xsns_35_tx20.ino

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/*
xsns_35_Tx20.ino - La Crosse Tx20 wind sensor support for Sonoff-Tasmota
Copyright (C) 2018 Thomas Eckerstorfer 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_TX20_WIND_SENSOR
/*********************************************************************************************\
* La Crosse Tx20 wind sensor
*
* based on https://github.com/bunnyhu/ESP8266_TX20_wind_sensor/
* http://blog.bubux.de/windsensor-tx20-mit-esp8266/
* https://www.john.geek.nz/2011/07/la-crosse-tx20-anemometer-communication-protocol/
\*********************************************************************************************/
#define TX20_BIT_TIME 1220 // microseconds
#define TX20_RESET_VALUES 60 // seconds
// The Arduino standard GPIO routines are not enough,
// must use some from the Espressif SDK as well
extern "C" {
#include "gpio.h"
}
#ifdef USE_WEBSERVER
const char HTTP_SNS_TX20[] PROGMEM = "%s"
"{s}TX20 " D_TX20_WIND_SPEED "{m}%s " D_UNIT_KILOMETER_PER_HOUR "{e}"
"{s}TX20 " D_TX20_WIND_SPEED_AVG "{m}%s " D_UNIT_KILOMETER_PER_HOUR "{e}"
"{s}TX20 " D_TX20_WIND_SPEED_MAX "{m}%s " D_UNIT_KILOMETER_PER_HOUR "{e}"
"{s}TX20 " D_TX20_WIND_DIRECTION "{m}%s{e}";
#endif // USE_WEBSERVER
const char kTx20Directions[] PROGMEM = D_TX20_NORTH "|"
D_TX20_NORTH D_TX20_NORTH D_TX20_EAST "|"
D_TX20_NORTH D_TX20_EAST "|"
D_TX20_EAST D_TX20_NORTH D_TX20_EAST "|"
D_TX20_EAST "|"
D_TX20_EAST D_TX20_SOUTH D_TX20_EAST "|"
D_TX20_SOUTH D_TX20_EAST "|"
D_TX20_SOUTH D_TX20_SOUTH D_TX20_EAST "|"
D_TX20_SOUTH "|"
D_TX20_SOUTH D_TX20_SOUTH D_TX20_WEST "|"
D_TX20_SOUTH D_TX20_WEST "|"
D_TX20_WEST D_TX20_SOUTH D_TX20_WEST "|"
D_TX20_WEST "|"
D_TX20_WEST D_TX20_NORTH D_TX20_WEST "|"
D_TX20_NORTH D_TX20_WEST "|"
D_TX20_NORTH D_TX20_NORTH D_TX20_WEST;
uint8_t tx20_sa = 0;
uint8_t tx20_sb = 0;
uint8_t tx20_sd = 0;
uint8_t tx20_se = 0;
uint16_t tx20_sc = 0;
uint16_t tx20_sf = 0;
float tx20_wind_speed_kmh = 0;
float tx20_wind_speed_max = 0;
float tx20_wind_speed_avg = 0;
float tx20_wind_sum = 0;
int tx20_count = 0;
uint8_t tx20_wind_direction = 0;
boolean tx20_available = false;
void Tx20StartRead()
{
/* La Crosse TX20 Anemometer datagram every 2 seconds
* 0-0 11011 0011 111010101111 0101 1100 000101010000 0-0 - Received pin data at 1200 uSec per bit
* sa sb sc sd se sf
* 00100 1100 000101010000 1010 1100 000101010000 - sa to sd inverted user data, LSB first
* sa - Start frame always 00100
* sb - Wind direction 0 - 15
* sc - Wind speed 0 - 511
* sd - Checksum
* se - Wind direction 0 - 15
* sf - Wind speed 0 - 511
*/
tx20_available = false;
tx20_sa = 0;
tx20_sb = 0;
tx20_sd = 0;
tx20_se = 0;
tx20_sc = 0;
tx20_sf = 0;
delayMicroseconds(TX20_BIT_TIME / 2);
for (int bitcount = 41; bitcount > 0; bitcount--) {
uint8_t dpin = (digitalRead(pin[GPIO_TX20_TXD_BLACK]));
if (bitcount > 41 - 5) {
// start, inverted
tx20_sa = (tx20_sa << 1) | (dpin ^ 1);
} else if (bitcount > 41 - 5 - 4) {
// wind dir, inverted
tx20_sb = tx20_sb >> 1 | ((dpin ^ 1) << 3);
} else if (bitcount > 41 - 5 - 4 - 12) {
// windspeed, inverted
tx20_sc = tx20_sc >> 1 | ((dpin ^ 1) << 11);
} else if (bitcount > 41 - 5 - 4 - 12 - 4) {
// checksum, inverted
tx20_sd = tx20_sd >> 1 | ((dpin ^ 1) << 3);
} else if (bitcount > 41 - 5 - 4 - 12 - 4 - 4) {
// wind dir
tx20_se = tx20_se >> 1 | (dpin << 3);
} else {
// windspeed
tx20_sf = tx20_sf >> 1 | (dpin << 11);
}
delayMicroseconds(TX20_BIT_TIME);
}
uint8_t chk = (tx20_sb + (tx20_sc & 0xf) + ((tx20_sc >> 4) & 0xf) + ((tx20_sc >> 8) & 0xf));
chk &= 0xf;
if ((chk == tx20_sd) && (tx20_sc < 400)) { // if checksum seems to be ok and wind speed below 40 m/s
tx20_available = true;
}
/*
if ((tx20_sb == tx20_se) && (tx20_sc == tx20_sf) && (tx20_sc < 400)) {
tx20_available = true;
}
*/
// Must clear this bit in the interrupt register,
// it gets set even when interrupts are disabled
GPIO_REG_WRITE(GPIO_STATUS_W1TC_ADDRESS, 1 << pin[GPIO_TX20_TXD_BLACK]);
}
void Tx20Read()
{
if (!(uptime % TX20_RESET_VALUES)) {
tx20_count = 0;
tx20_wind_sum = 0;
tx20_wind_speed_max = 0;
}
else if (tx20_available) {
tx20_wind_speed_kmh = float(tx20_sc) * 0.36;
if (tx20_wind_speed_kmh > tx20_wind_speed_max) {
tx20_wind_speed_max = tx20_wind_speed_kmh;
}
tx20_count++;
tx20_wind_sum += tx20_wind_speed_kmh;
tx20_wind_speed_avg = tx20_wind_sum / tx20_count;
tx20_wind_direction = tx20_sb;
}
}
void Tx20Init() {
pinMode(pin[GPIO_TX20_TXD_BLACK], INPUT);
attachInterrupt(pin[GPIO_TX20_TXD_BLACK], Tx20StartRead, RISING);
}
void Tx20Show(boolean json)
{
char wind_speed_string[10];
char wind_speed_max_string[10];
char wind_speed_avg_string[10];
char wind_direction_string[4];
dtostrfd(tx20_wind_speed_kmh, 2, wind_speed_string);
dtostrfd(tx20_wind_speed_max, 2, wind_speed_max_string);
dtostrfd(tx20_wind_speed_avg, 2, wind_speed_avg_string);
GetTextIndexed(wind_direction_string, sizeof(wind_direction_string), tx20_wind_direction, kTx20Directions);
if (json) {
snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s,\"TX20\":{\"Speed\":%s,\"SpeedAvg\":%s,\"SpeedMax\":%s,\"Direction\":\"%s\"}"),
mqtt_data, wind_speed_string, wind_speed_avg_string, wind_speed_max_string, wind_direction_string);
#ifdef USE_WEBSERVER
} else {
snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TX20, mqtt_data, wind_speed_string, wind_speed_avg_string, wind_speed_max_string, wind_direction_string);
#endif // USE_WEBSERVER
}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
#define XSNS_35
boolean Xsns35(byte function)
{
boolean result = false;
if (pin[GPIO_TX20_TXD_BLACK] < 99) {
switch (function) {
case FUNC_INIT:
Tx20Init();
break;
case FUNC_EVERY_SECOND:
Tx20Read();
break;
case FUNC_JSON_APPEND:
Tx20Show(1);
break;
#ifdef USE_WEBSERVER
case FUNC_WEB_APPEND:
Tx20Show(0);
break;
#endif // USE_WEBSERVER
}
}
return result;
}
#endif // USE_TX20_WIND_SENSOR
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