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Tasmota/tasmota/xsns_34_hx711.ino

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/*
xsns_34_hx711.ino - HX711 load cell support for Tasmota
Copyright (C) 2019 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_HX711
/*********************************************************************************************\
* HX711 - Load cell as used in a scale
*
* Source: Sparkfun and https://github.com/bogde/HX711
*
* To reset the scale:
* - Execute command Sensor34 1
*
* To calibrate the scale perform the following tasks:
* - Set reference weight once using command Sensor34 3 <reference weight in gram>
* - Remove any weight from the scale
* - Execute command Sensor34 2 and follow messages shown
\*********************************************************************************************/
#define XSNS_34 34
#ifndef HX_MAX_WEIGHT
#define HX_MAX_WEIGHT 20000 // Default max weight in gram
#endif
#ifndef HX_REFERENCE
#define HX_REFERENCE 250 // Default reference weight for calibration in gram
#endif
#ifndef HX_SCALE
#define HX_SCALE 120 // Default result of measured weight / reference weight when scale is 1
#endif
#define HX_TIMEOUT 120 // A reading at default 10Hz (pin RATE to Gnd on HX711) can take up to 100 milliseconds
#define HX_SAMPLES 10 // Number of samples for average calculation
#define HX_CAL_TIMEOUT 15 // Calibration step window in number of seconds
#define HX_GAIN_128 1 // Channel A, gain factor 128
#define HX_GAIN_32 2 // Channel B, gain factor 32
#define HX_GAIN_64 3 // Channel A, gain factor 64
#define D_JSON_WEIGHT_REF "WeightRef"
#define D_JSON_WEIGHT_CAL "WeightCal"
#define D_JSON_WEIGHT_MAX "WeightMax"
#define D_JSON_WEIGHT_ITEM "WeightItem"
#define D_JSON_WEIGHT_CHANGE "WeightChange"
enum HxCalibrationSteps { HX_CAL_END, HX_CAL_LIMBO, HX_CAL_FINISH, HX_CAL_FAIL, HX_CAL_DONE, HX_CAL_FIRST, HX_CAL_RESET, HX_CAL_START };
const char kHxCalibrationStates[] PROGMEM = D_HX_CAL_FAIL "|" D_HX_CAL_DONE "|" D_HX_CAL_REFERENCE "|" D_HX_CAL_REMOVE;
struct HX {
long weight = 0;
long last_weight = 0;
long sum_weight = 0;
long offset = 0;
long scale = 1;
long weight_diff = 0;
uint8_t type = 1;
uint8_t sample_count = 0;
uint8_t calibrate_step = HX_CAL_END;
uint8_t calibrate_timer = 0;
uint8_t calibrate_msg = 0;
uint8_t pin_sck;
uint8_t pin_dout;
bool tare_flg = false;
bool weight_changed = false;
} Hx;
/*********************************************************************************************/
bool HxIsReady(uint16_t timeout)
{
// A reading can take up to 100 mS or 600mS after power on
uint32_t start = millis();
while ((digitalRead(Hx.pin_dout) == HIGH) && (millis() - start < timeout)) { yield(); }
return (digitalRead(Hx.pin_dout) == LOW);
}
long HxRead()
{
if (!HxIsReady(HX_TIMEOUT)) { return -1; }
uint8_t data[3] = { 0 };
uint8_t filler = 0x00;
// pulse the clock pin 24 times to read the data
data[2] = shiftIn(Hx.pin_dout, Hx.pin_sck, MSBFIRST);
data[1] = shiftIn(Hx.pin_dout, Hx.pin_sck, MSBFIRST);
data[0] = shiftIn(Hx.pin_dout, Hx.pin_sck, MSBFIRST);
// set the channel and the gain factor for the next reading using the clock pin
for (unsigned int i = 0; i < HX_GAIN_128; i++) {
digitalWrite(Hx.pin_sck, HIGH);
digitalWrite(Hx.pin_sck, LOW);
}
// Replicate the most significant bit to pad out a 32-bit signed integer
if (data[2] & 0x80) { filler = 0xFF; }
// Construct a 32-bit signed integer
unsigned long value = ( static_cast<unsigned long>(filler) << 24
| static_cast<unsigned long>(data[2]) << 16
| static_cast<unsigned long>(data[1]) << 8
| static_cast<unsigned long>(data[0]) );
return static_cast<long>(value);
}
/*********************************************************************************************/
void HxResetPart(void)
{
Hx.tare_flg = true;
Hx.sum_weight = 0;
Hx.sample_count = 0;
Hx.last_weight = 0;
}
void HxReset(void)
{
HxResetPart();
Settings.energy_frequency_calibration = 0;
}
void HxCalibrationStateTextJson(uint8_t msg_id)
{
char cal_text[30];
Hx.calibrate_msg = msg_id;
Response_P(S_JSON_SENSOR_INDEX_SVALUE, XSNS_34, GetTextIndexed(cal_text, sizeof(cal_text), Hx.calibrate_msg, kHxCalibrationStates));
if (msg_id < 3) { MqttPublishPrefixTopic_P(RESULT_OR_STAT, PSTR("Sensor34")); }
}
/*********************************************************************************************\
* Supported commands for Sensor34:
*
* Sensor34 1 - Reset display to 0
* Sensor34 2 - Start calibration
* Sensor34 2 <weight in gram> - Set reference weight and start calibration
* Sensor34 3 - Show reference weight in gram
* Sensor34 3 <weight in gram> - Set reference weight
* Sensor34 4 - Show calibrated scale value
* Sensor34 4 <scale value> - Set calibrated scale value
* Sensor34 5 - Show max weigth in gram
* Sensor34 5 <weight in gram> - Set max weight
* Sensor34 6 - Show item weigth in decigram
* Sensor34 6 <weight in decigram> - Set item weight
* Sensor34 7 - Save current weight to be used as start weight on restart
* Sensor34 8 0 - Disable JSON weight change message
* Sensor34 8 1 - Enable JSON weight change message
\*********************************************************************************************/
bool HxCommand(void)
{
bool serviced = true;
bool show_parms = false;
char sub_string[XdrvMailbox.data_len +1];
for (uint32_t ca = 0; ca < XdrvMailbox.data_len; ca++) {
if ((' ' == XdrvMailbox.data[ca]) || ('=' == XdrvMailbox.data[ca])) { XdrvMailbox.data[ca] = ','; }
}
switch (XdrvMailbox.payload) {
case 1: // Reset scale
HxReset();
Response_P(S_JSON_SENSOR_INDEX_SVALUE, XSNS_34, "Reset");
break;
case 2: // Calibrate
if (strstr(XdrvMailbox.data, ",") != nullptr) {
Settings.weight_reference = strtol(subStr(sub_string, XdrvMailbox.data, ",", 2), nullptr, 10);
}
Hx.scale = 1;
HxReset();
Hx.calibrate_step = HX_CAL_START;
Hx.calibrate_timer = 1;
HxCalibrationStateTextJson(3);
break;
case 3: // WeightRef to user reference
if (strstr(XdrvMailbox.data, ",") != nullptr) {
Settings.weight_reference = strtol(subStr(sub_string, XdrvMailbox.data, ",", 2), nullptr, 10);
}
show_parms = true;
break;
case 4: // WeightCal to user calculated value
if (strstr(XdrvMailbox.data, ",") != nullptr) {
Settings.weight_calibration = strtol(subStr(sub_string, XdrvMailbox.data, ",", 2), nullptr, 10);
Hx.scale = Settings.weight_calibration;
}
show_parms = true;
break;
case 5: // WeightMax
if (strstr(XdrvMailbox.data, ",") != nullptr) {
Settings.weight_max = strtol(subStr(sub_string, XdrvMailbox.data, ",", 2), nullptr, 10) / 1000;
}
show_parms = true;
break;
case 6: // WeightItem
if (strstr(XdrvMailbox.data, ",") != nullptr) {
Settings.weight_item = (unsigned long)(CharToFloat(subStr(sub_string, XdrvMailbox.data, ",", 2)) * 10);
}
show_parms = true;
break;
case 7: // WeightSave
Settings.energy_frequency_calibration = Hx.weight;
Response_P(S_JSON_SENSOR_INDEX_SVALUE, XSNS_34, D_JSON_DONE);
break;
case 8: // Json on weight change
if (strstr(XdrvMailbox.data, ",") != nullptr) {
Settings.SensorBits1.hx711_json_weight_change = strtol(subStr(sub_string, XdrvMailbox.data, ",", 2), nullptr, 10) & 1;
}
show_parms = true;
break;
default:
show_parms = true;
}
if (show_parms) {
char item[33];
dtostrfd((float)Settings.weight_item / 10, 1, item);
Response_P(PSTR("{\"Sensor34\":{\"" D_JSON_WEIGHT_REF "\":%d,\"" D_JSON_WEIGHT_CAL "\":%d,\"" D_JSON_WEIGHT_MAX "\":%d,\"" D_JSON_WEIGHT_ITEM "\":%s,\"" D_JSON_WEIGHT_CHANGE "\":\"%s\"}}"),
Settings.weight_reference, Settings.weight_calibration, Settings.weight_max * 1000, item, GetStateText(Settings.SensorBits1.hx711_json_weight_change));
}
return serviced;
}
/*********************************************************************************************/
long HxWeight()
{
return (Hx.calibrate_step < HX_CAL_FAIL) ? Hx.weight : 0;
}
void HxInit(void)
{
Hx.type = 0;
if ((pin[GPIO_HX711_DAT] < 99) && (pin[GPIO_HX711_SCK] < 99)) {
Hx.pin_sck = pin[GPIO_HX711_SCK];
Hx.pin_dout = pin[GPIO_HX711_DAT];
pinMode(Hx.pin_sck, OUTPUT);
pinMode(Hx.pin_dout, INPUT);
digitalWrite(Hx.pin_sck, LOW);
if (HxIsReady(8 * HX_TIMEOUT)) { // Can take 600 milliseconds after power on
if (!Settings.weight_max) { Settings.weight_max = HX_MAX_WEIGHT / 1000; }
if (!Settings.weight_calibration) { Settings.weight_calibration = HX_SCALE; }
if (!Settings.weight_reference) { Settings.weight_reference = HX_REFERENCE; }
Hx.scale = Settings.weight_calibration;
HxRead();
HxResetPart();
Hx.type = 1;
}
}
}
void HxEvery100mSecond(void)
{
Hx.sum_weight += HxRead();
Hx.sample_count++;
if (HX_SAMPLES == Hx.sample_count) {
long average = Hx.sum_weight / Hx.sample_count; // grams
long value = average - Hx.offset; // grams
Hx.weight = value / Hx.scale; // grams
if (Hx.weight < 0) {
if (Settings.energy_frequency_calibration) {
long difference = Settings.energy_frequency_calibration + Hx.weight;
Hx.last_weight = difference;
if (difference < 0) { HxReset(); } // Cancel last weight as there seems to be no more weight on the scale
}
Hx.weight = 0;
} else {
Hx.last_weight = Settings.energy_frequency_calibration;
}
if (Hx.tare_flg) {
Hx.tare_flg = false;
Hx.offset = average; // grams
}
if (Hx.calibrate_step) {
Hx.calibrate_timer--;
if (HX_CAL_START == Hx.calibrate_step) { // Skip reset just initiated
Hx.calibrate_step--;
Hx.calibrate_timer = HX_CAL_TIMEOUT * (10 / HX_SAMPLES);
}
else if (HX_CAL_RESET == Hx.calibrate_step) { // Wait for stable reset
if (Hx.calibrate_timer) {
if (Hx.weight < (long)Settings.weight_reference) {
Hx.calibrate_step--;
Hx.calibrate_timer = HX_CAL_TIMEOUT * (10 / HX_SAMPLES);
HxCalibrationStateTextJson(2);
}
} else {
Hx.calibrate_step = HX_CAL_FAIL;
}
}
else if (HX_CAL_FIRST == Hx.calibrate_step) { // Wait for first reference weight
if (Hx.calibrate_timer) {
if (Hx.weight > (long)Settings.weight_reference) {
Hx.calibrate_step--;
}
} else {
Hx.calibrate_step = HX_CAL_FAIL;
}
}
else if (HX_CAL_DONE == Hx.calibrate_step) { // Second stable reference weight
if (Hx.weight > (long)Settings.weight_reference) {
Hx.calibrate_step = HX_CAL_FINISH; // Calibration done
Settings.weight_calibration = Hx.weight / Settings.weight_reference;
Hx.weight = 0; // Reset calibration value
HxCalibrationStateTextJson(1);
} else {
Hx.calibrate_step = HX_CAL_FAIL;
}
}
if (HX_CAL_FAIL == Hx.calibrate_step) { // Calibration failed
Hx.calibrate_step--;
Hx.tare_flg = true; // Perform a reset using old scale
HxCalibrationStateTextJson(0);
}
if (HX_CAL_FINISH == Hx.calibrate_step) { // Calibration finished
Hx.calibrate_step--;
Hx.calibrate_timer = 3 * (10 / HX_SAMPLES);
Hx.scale = Settings.weight_calibration;
}
if (!Hx.calibrate_timer) {
Hx.calibrate_step = HX_CAL_END; // End of calibration
}
} else {
Hx.weight += Hx.last_weight; // grams
if (Settings.SensorBits1.hx711_json_weight_change) {
if (abs(Hx.weight - Hx.weight_diff) > 4) { // Use 4 gram threshold to decrease "ghost" weights
Hx.weight_diff = Hx.weight;
Hx.weight_changed = true;
}
else if (Hx.weight_changed && (Hx.weight == Hx.weight_diff)) {
mqtt_data[0] = '\0';
ResponseAppendTime();
HxShow(true);
ResponseJsonEnd();
MqttPublishTeleSensor();
Hx.weight_changed = false;
}
}
}
Hx.sum_weight = 0;
Hx.sample_count = 0;
}
}
void HxSaveBeforeRestart()
{
Settings.energy_frequency_calibration = Hx.weight;
Hx.sample_count = HX_SAMPLES +1; // Stop updating Hx.weight
}
#ifdef USE_WEBSERVER
const char HTTP_HX711_WEIGHT[] PROGMEM =
"{s}HX711 " D_WEIGHT "{m}%s " D_UNIT_KILOGRAM "{e}"; // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
const char HTTP_HX711_COUNT[] PROGMEM =
"{s}HX711 " D_COUNT "{m}%d{e}";
const char HTTP_HX711_CAL[] PROGMEM =
"{s}HX711 %s{m}{e}";
#endif // USE_WEBSERVER
void HxShow(bool json)
{
char scount[30] = { 0 };
uint16_t count = 0;
float weight = 0;
if (Hx.calibrate_step < HX_CAL_FAIL) {
if (Hx.weight && Settings.weight_item) {
count = (Hx.weight * 10) / Settings.weight_item;
if (count > 1) {
snprintf_P(scount, sizeof(scount), PSTR(",\"" D_JSON_COUNT "\":%d"), count);
}
}
weight = (float)Hx.weight / 1000; // kilograms
}
char weight_chr[33];
dtostrfd(weight, Settings.flag2.weight_resolution, weight_chr);
if (json) {
ResponseAppend_P(PSTR(",\"HX711\":{\"" D_JSON_WEIGHT "\":%s%s}"), weight_chr, scount);
#ifdef USE_WEBSERVER
} else {
WSContentSend_PD(HTTP_HX711_WEIGHT, weight_chr);
if (count > 1) {
WSContentSend_PD(HTTP_HX711_COUNT, count);
}
if (Hx.calibrate_step) {
char cal_text[30];
WSContentSend_PD(HTTP_HX711_CAL, GetTextIndexed(cal_text, sizeof(cal_text), Hx.calibrate_msg, kHxCalibrationStates));
}
#endif // USE_WEBSERVER
}
}
#ifdef USE_WEBSERVER
#ifdef USE_HX711_GUI
/*********************************************************************************************\
* Optional GUI
\*********************************************************************************************/
#define WEB_HANDLE_HX711 "s34"
const char S_CONFIGURE_HX711[] PROGMEM = D_CONFIGURE_HX711;
const char HTTP_BTN_MENU_MAIN_HX711[] PROGMEM =
"<p><form action='" WEB_HANDLE_HX711 "' method='get'><button name='reset'>" D_RESET_HX711 "</button></form></p>";
const char HTTP_BTN_MENU_HX711[] PROGMEM =
"<p><form action='" WEB_HANDLE_HX711 "' method='get'><button>" D_CONFIGURE_HX711 "</button></form></p>";
const char HTTP_FORM_HX711[] PROGMEM =
"<fieldset><legend><b>&nbsp;" D_CALIBRATION "&nbsp;</b></legend>"
"<form method='post' action='" WEB_HANDLE_HX711 "'>"
"<p><b>" D_REFERENCE_WEIGHT "</b> (" D_UNIT_KILOGRAM ")<br><input type='number' step='0.001' id='p1' placeholder='0' value='%s'></p>"
"<br><button name='calibrate' type='submit'>" D_CALIBRATE "</button>"
"</form>"
"</fieldset><br><br>"
"<fieldset><legend><b>&nbsp;" D_HX711_PARAMETERS "&nbsp;</b></legend>"
"<form method='post' action='" WEB_HANDLE_HX711 "'>"
"<p><b>" D_ITEM_WEIGHT "</b> (" D_UNIT_KILOGRAM ")<br><input type='number' max='6.5535' step='0.0001' id='p2' placeholder='0.0' value='%s'></p>";
void HandleHxAction(void)
{
if (!HttpCheckPriviledgedAccess()) { return; }
AddLog_P(LOG_LEVEL_DEBUG, S_LOG_HTTP, S_CONFIGURE_HX711);
if (WebServer->hasArg("save")) {
HxSaveSettings();
HandleConfiguration();
return;
}
char stemp1[20];
if (WebServer->hasArg("reset")) {
snprintf_P(stemp1, sizeof(stemp1), PSTR("Sensor34 1")); // Reset
ExecuteWebCommand(stemp1, SRC_WEBGUI);
HandleRoot(); // Return to main screen
return;
}
if (WebServer->hasArg("calibrate")) {
WebGetArg("p1", stemp1, sizeof(stemp1));
Settings.weight_reference = (!strlen(stemp1)) ? 0 : (unsigned long)(CharToFloat(stemp1) * 1000);
HxLogUpdates();
snprintf_P(stemp1, sizeof(stemp1), PSTR("Sensor34 2")); // Start calibration
ExecuteWebCommand(stemp1, SRC_WEBGUI);
HandleRoot(); // Return to main screen
return;
}
WSContentStart_P(S_CONFIGURE_HX711);
WSContentSendStyle();
dtostrfd((float)Settings.weight_reference / 1000, 3, stemp1);
char stemp2[20];
dtostrfd((float)Settings.weight_item / 10000, 4, stemp2);
WSContentSend_P(HTTP_FORM_HX711, stemp1, stemp2);
WSContentSend_P(HTTP_FORM_END);
WSContentSpaceButton(BUTTON_CONFIGURATION);
WSContentStop();
}
void HxSaveSettings(void)
{
char tmp[100];
WebGetArg("p2", tmp, sizeof(tmp));
Settings.weight_item = (!strlen(tmp)) ? 0 : (unsigned long)(CharToFloat(tmp) * 10000);
HxLogUpdates();
}
void HxLogUpdates(void)
{
char weigth_ref_chr[33];
dtostrfd((float)Settings.weight_reference / 1000, Settings.flag2.weight_resolution, weigth_ref_chr);
char weigth_item_chr[33];
dtostrfd((float)Settings.weight_item / 10000, 4, weigth_item_chr);
AddLog_P2(LOG_LEVEL_INFO, PSTR(D_LOG_WIFI D_JSON_WEIGHT_REF " %s, " D_JSON_WEIGHT_ITEM " %s"), weigth_ref_chr, weigth_item_chr);
}
#endif // USE_HX711_GUI
#endif // USE_WEBSERVER
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xsns34(uint8_t function)
{
bool result = false;
if (Hx.type) {
switch (function) {
case FUNC_EVERY_100_MSECOND:
HxEvery100mSecond();
break;
case FUNC_COMMAND_SENSOR:
if (XSNS_34 == XdrvMailbox.index) {
result = HxCommand();
}
break;
case FUNC_JSON_APPEND:
HxShow(1);
break;
case FUNC_SAVE_BEFORE_RESTART:
HxSaveBeforeRestart();
break;
#ifdef USE_WEBSERVER
case FUNC_WEB_SENSOR:
HxShow(0);
break;
#ifdef USE_HX711_GUI
case FUNC_WEB_ADD_MAIN_BUTTON:
WSContentSend_P(HTTP_BTN_MENU_MAIN_HX711);
break;
case FUNC_WEB_ADD_BUTTON:
WSContentSend_P(HTTP_BTN_MENU_HX711);
break;
case FUNC_WEB_ADD_HANDLER:
WebServer->on("/" WEB_HANDLE_HX711, HandleHxAction);
break;
#endif // USE_HX711_GUI
#endif // USE_WEBSERVER
case FUNC_INIT:
HxInit();
break;
}
}
return result;
}
#endif // USE_HX711
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