add voltage sensing
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d2e710b4ba
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92
src/main.cpp
92
src/main.cpp
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@ -8,6 +8,16 @@
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//Upload config: platformio run --target uploadfs
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#define PIN_VBAT A0
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unsigned long vbat_calib1_adc=581; //adc value at vbat_calib_voltage (voltage at battery)
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float vbat_calib1_voltage=6.0; //voltage used for calibration
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unsigned long vbat_calib2_adc=782; //second calibration point (higher voltage)
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float vbat_calib2_voltage=8.0;
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int vbat_raw_filtered=-1; //-1 flags it as initialized
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bool vbatSent=false;
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#include <TM1637Display.h>
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#define TM1637_CLK D5
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@ -82,7 +92,8 @@ bool livesend=false; //if true, sends continuous data over mqtt
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void loopHandler();
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HomieNode scaleNode("weight", "Scale", "scale"); //paramters: topic, $name, $type
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HomieNode displayNode("display", "Scale", "scale"); //paramters: topic, $name, $type
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HomieNode displayNode("display", "Display", "scale"); //paramters: topic, $name, $type
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HomieNode hardwareNode("hardware", "Hardware", "scale"); //paramters: topic, $name, $type
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int sort_desc(const void *cmp1, const void *cmp2);
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float getFilteredWeight();
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@ -92,8 +103,10 @@ bool cmdHandler(const HomieRange& range, const String& value);
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bool displayNodeHandler(const HomieRange& range, const String& value);
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void powerOff();
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void displayNumber(float numberdisplay);
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float getVBat();
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void updateVBat();
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void sendVBat();
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float mapFloat(float x, float in_min, float in_max, float out_min, float out_max);
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void setup() {
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pinMode(PIN_SELFENABLE,OUTPUT);
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@ -114,7 +127,7 @@ void setup() {
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Homie_setBrand(FW_NAME);
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Homie.setLoopFunction(loopHandler);
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scaleNode.advertise("cmd").settable(cmdHandler); //function inputHandler gets called on new message on topic/input/set
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scaleNode.advertise("human");
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scaleNode.advertise("spread");
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scaleNode.advertise("raw");
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@ -122,6 +135,10 @@ void setup() {
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displayNode.advertise("segments").settable(displayNodeHandler);
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hardwareNode.advertise("cmd").settable(cmdHandler); //function inputHandler gets called on new message on topic/input/set
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hardwareNode.advertise("vbat");
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hardwareNode.advertise("vbatraw");
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Homie.setup();
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@ -148,12 +165,12 @@ void loop() {
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void loopHandler() {
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unsigned long loopmillis=millis();
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static unsigned long last_measure=0;
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if (loopmillis>last_measure+MEASURE_INTERVAL) {
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last_measure=loopmillis;
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updateVBat(); //also update vbat reading
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//Serial.print("reading=");
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weight_current=0;
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if (scale.wait_ready_timeout(1000)) { //for non blocking mode
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@ -163,7 +180,7 @@ void loopHandler() {
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weight_read[weight_read_pos]=weight_current; //one reading takes 91ms
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} else {
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Serial.println("HX711 not found.");
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scaleNode.setProperty("cmd").send("HX711 not found"); //can be done in main loop
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hardwareNode.setProperty("cmd").send("HX711 not found"); //can be done in main loop
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}
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weight_filtered=getFilteredWeight();
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@ -196,15 +213,30 @@ void loopHandler() {
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if (!weight_sent) {
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if (weight_max-weight_tare>MIN_WEIGHT_DIFFERENCE) {
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if (Homie.getMqttClient().connected()) {
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sendWeight(weight_max-weight_tare);
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}else{
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Serial.println("Cannot send weight because mqtt not connected!");
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}
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update_display=true;
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}
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}
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if (!vbatSent && loopmillis>10000) { //send voltage some time after turn on
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if (Homie.getMqttClient().connected()) {
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sendVBat();
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vbatSent=true;
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}else{
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Serial.println("Cannot send vbat because mqtt not connected!");
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}
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}
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}
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if (livesend && (millis()>last_mqtt_send+MQTT_SENDINTERVALL)) {
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if (Homie.getMqttClient().connected() && livesend && (millis()>last_mqtt_send+MQTT_SENDINTERVALL)) {
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last_mqtt_send=millis();
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//float weight_filtered=getFilteredWeight();
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@ -315,10 +347,10 @@ bool cmdHandler(const HomieRange& range, const String& value) {
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if (scale.wait_ready_timeout(1000)) { //for non blocking mode
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scale.set_scale();
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scale.tare();
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scaleNode.setProperty("cmd").send("tared");
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hardwareNode.setProperty("cmd").send("tared");
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} else {
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Serial.println("HX711 not found.");
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scaleNode.setProperty("cmd").send("HX711 not found");
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hardwareNode.setProperty("cmd").send("HX711 not found");
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}
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}else if (value=="calibrate") { //get raw value. use "reset" first. then adc to get value for calibration to enter in SCALE_CALIBRATION
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@ -326,21 +358,23 @@ bool cmdHandler(const HomieRange& range, const String& value) {
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long _units=scale.get_units(10); //if set_scale was called with no parameter before, get_units has not decimals
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char charBuf[13];
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dtostrf(_units,2, 1, charBuf);
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scaleNode.setProperty("cmd").send(charBuf);
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hardwareNode.setProperty("cmd").send(charBuf);
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} else {
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Serial.println("HX711 not found.");
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scaleNode.setProperty("cmd").send("HX711 not found");
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hardwareNode.setProperty("cmd").send("HX711 not found");
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}
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}else if (value=="live") {
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livesend=!livesend;
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if (livesend) {
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scaleNode.setProperty("cmd").send("live data enabled");
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hardwareNode.setProperty("cmd").send("live data enabled");
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}else{
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scaleNode.setProperty("cmd").send("live data disabled");
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hardwareNode.setProperty("cmd").send("live data disabled");
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}
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}else if (value=="vbat") {
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sendVBat();
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}else if (value=="off") {
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powerOff();
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scaleNode.setProperty("cmd").send("shutting down");
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hardwareNode.setProperty("cmd").send("shutting down");
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} else {
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Homie.getLogger() << "cmd not recognized" << endl;
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return false;
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@ -460,3 +494,31 @@ void displayNumber(float numberdisplay) {
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}
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}
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float getVBat() { //get filtered vbat value
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return mapFloat(vbat_raw_filtered,vbat_calib1_adc,vbat_calib2_adc, vbat_calib1_voltage,vbat_calib2_voltage); //2-point mapping adc -> voltage;
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}
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void updateVBat() { //continuous update for filtering
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float vbat_filter=0.95; //the closer to 1 the higher the filtering. 0 means no filtering
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if (vbat_raw_filtered<0) { //at first reading (vbat_raw_filtered is initialized with value <0)
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vbat_filter=0; //use first reading with 100%
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}
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vbat_raw_filtered=vbat_raw_filtered*vbat_filter + analogRead(PIN_VBAT)*(1.0-vbat_filter);
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}
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void sendVBat() {
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char charBuf[10];
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dtostrf(vbat_raw_filtered,1, 0, charBuf);
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hardwareNode.setProperty("vbatraw").send(charBuf);
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Serial.print("vbatraw="); Serial.println(vbat_raw_filtered);
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dtostrf(getVBat(),4, 3, charBuf);
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hardwareNode.setProperty("vbat").send(charBuf);
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Serial.print("vbat="); Serial.println(getVBat(),3);
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}
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float mapFloat(float x, float in_min, float in_max, float out_min, float out_max)
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{
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return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
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}
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