From fe29b238ff69332e6eb5ff55b3f16ded766b051e Mon Sep 17 00:00:00 2001
From: Fisch <interfisch@gmx.net>
Date: Tue, 17 Aug 2021 22:31:32 +0200
Subject: [PATCH] add htu21d sensor

---
 platformio.ini |  28 ++++++++++++-
 src/main.cpp   | 111 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 138 insertions(+), 1 deletion(-)

diff --git a/platformio.ini b/platformio.ini
index 6906272..4f15486 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -16,8 +16,9 @@
 #data_dir=data_sensoresp1
 #data_dir=data_sensoresp2
 #data_dir=data_sensoresp3
-data_dir=data_sensoresp4
+#data_dir=data_sensoresp4
 #data_dir=data_sensoresp5
+data_dir=data_sensoresp3dprinter
 
 
 #Outdoor
@@ -244,3 +245,28 @@ lib_deps =
     Homie@3.0.0
 
 
+
+#3D Printer
+[env:sensoresp3dprinter]
+platform = espressif8266
+board = d1_mini
+framework = arduino
+
+monitor_port = /dev/ttyUSB0
+monitor_speed = 115200
+
+build_flags =
+    -D SENSOR_HTU21D
+    -D dataHTU21D_temperature_minchange=0.2
+    -D dataHTU21D_temperature_senddelaymax=1000*60*10
+    -D dataHTU21D_humidity_minchange=1.0
+    -D dataHTU21D_humidity_senddelaymax=1000*60*10
+
+
+
+lib_deps =
+    adafruit/Adafruit HTU21DF Library @ ^1.0.5
+    ArduinoJson@6.16.1 #dependency of homie. using older version because of "ambiguous overload for operator|" error
+    Homie@3.0.0
+
+
diff --git a/src/main.cpp b/src/main.cpp
index a8663e9..4813988 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -53,6 +53,21 @@ struct sensordata
   float value_pressureBMP=0;
 #endif
 
+#ifdef SENSOR_HTU21D
+  //Connect SCL to D1, SDA to D2, GND and 3v3
+  #ifndef WIRE_H
+  #include <Wire.h>
+  #define WIRE_H
+  #endif
+  #include "Adafruit_HTU21DF.h"
+  bool htu21dinit_ok=false;
+  Adafruit_HTU21DF htu = Adafruit_HTU21DF();
+  struct sensordata dataHTU21D_temperature; //struct values are changed in setup()
+  float value_temperatureHTU=0;
+  struct sensordata dataHTU21D_humidity; //struct values are changed in setup()
+  float value_humidityHTU=0;
+#endif
+
 #ifdef SENSOR_HS1101
   struct sensordata dataHS1101;
   float value_humidityHS1101=0;
@@ -66,7 +81,10 @@ struct sensordata
 
 #ifdef SENSOR_BH1750
   //SCL=D1, SDA=D2
+  #ifndef WIRE_H
   #include <Wire.h>
+  #define WIRE_H
+  #endif
   #include <BH1750.h>
   BH1750 lightMeter(0x23); //0x23 if addr connected to ground (=pin open), 0x5c if addr pulled high
   bool bh1750init_ok=false;
@@ -297,6 +315,29 @@ void setup() {
     #endif
   #endif
 
+  #ifdef SENSOR_HTU21D
+    Serial.println("initializing htu21d");
+    if (!htu.begin()) {
+      Serial.println("#ERROR: HTU21D init fail\n");
+    }else{
+      htu21dinit_ok=true; //stays false if init failed, sensor will not be read in loop
+    }
+    #ifdef dataHTU21D_temperature_minchange
+      dataHTU21D_temperature.minchange=dataHTU21D_temperature_minchange;
+    #endif
+    #ifdef dataHTU21D_temperature_senddelaymax
+      dataHTU21D_temperature.senddelaymax=dataHTU21D_temperature_senddelaymax;
+    #endif
+    #ifdef dataHTU21D_humidity_minchange
+      dataHTU21D_humidity.minchange=dataHTU21D_humidity_minchange;
+    #endif
+    #ifdef dataHTU21D_humidity_senddelaymax
+      dataHTU21D_humidity.senddelaymax=dataHTU21D_humidity_senddelaymax;
+    #endif
+  #endif
+
+
+
   #ifdef SENSOR_HS1101
     Serial.println("initializing hs1101");
     #ifdef dataHS1101_minchange
@@ -507,6 +548,11 @@ void setup() {
     sensorNode.advertise("pressure");
   #endif
 
+  #ifdef SENSOR_HTU21D
+    sensorNode.advertise("temperature_htu");
+    sensorNode.advertise("humidity_htu");
+  #endif
+
   #ifdef SENSOR_MHZ19
     sensorNode.advertise("co2");
     #ifdef MHZ19CALIBRATIONTOPIC
@@ -671,6 +717,64 @@ void loop_BMP180_pressure()
 }
 #endif
 
+#ifdef SENSOR_HTU21D
+void loop_HTU21D_temperature()
+{
+  sensordata &d=dataHTU21D_temperature;
+  bool _changed=false;  
+
+  if (millis() >= (d.lastreadtime+d.readdelay)) {
+    value_temperatureHTU = htu.readTemperature();
+    if (fabs(d.lastsentvalue-value_temperatureHTU)>=d.minchange){
+      _changed=true;
+    }
+    d.lastreadtime=millis();
+  }
+
+  if (_changed || millis() >= (d.lastsent+d.senddelaymax)) {
+    Serial.print("Sending HTU21D_temperature. reason=");
+    if (_changed) Serial.println("change"); else Serial.println("time");
+    checkESPStatus();
+
+    if (!(isnan(value_temperatureHTU) == 1)){ //success
+      sensorNode.setProperty("temperature_htu").send(String(value_temperatureHTU));
+      Homie.getLogger() << "temperature_htu " << ": " << value_temperatureHTU << endl;    
+      d.lastsentvalue=value_temperatureHTU;
+    }
+
+    d.lastsent=millis();
+  }
+}
+
+void loop_HTU21D_humidity()
+{
+  sensordata &d=dataHTU21D_humidity;
+  bool _changed=false;  
+
+  if (millis() >= (d.lastreadtime+d.readdelay)) {
+    value_humidityHTU = htu.readHumidity();
+    if (fabs(d.lastsentvalue-value_humidityHTU)>=d.minchange){
+      _changed=true;
+    }
+    d.lastreadtime=millis();
+  }
+
+  if (_changed || millis() >= (d.lastsent+d.senddelaymax)) {
+    Serial.print("Sending HTU21D_humidity. reason=");
+    if (_changed) Serial.println("change"); else Serial.println("time");
+    checkESPStatus();
+
+    if (!(isnan(value_humidityHTU) == 1)){ //success
+      sensorNode.setProperty("humidity_htu").send(String(value_humidityHTU));
+      Homie.getLogger() << "humidity_htu " << ": " << value_humidityHTU << endl;    
+      d.lastsentvalue=value_humidityHTU;
+    }
+
+    d.lastsent=millis();
+  }
+}
+#endif
+
 #ifdef SENSOR_HS1101
 void loop_HS1101() {
   
@@ -1156,6 +1260,13 @@ void loopHandler() {
     }
   #endif
 
+  #ifdef SENSOR_HTU21D
+    if (htu21dinit_ok) {
+      loop_HTU21D_temperature();
+      loop_HTU21D_humidity();
+    }
+  #endif
+
   #ifdef SENSOR_HS1101
     loop_HS1101();
   #endif