From bc6f738e2d8db836b1ca0559701f18ffb425a106 Mon Sep 17 00:00:00 2001
From: Steven <steven.vasilogianis@gmail.com>
Date: Wed, 6 Oct 2021 03:36:26 -0400
Subject: run sensors more often plus big brain c++ lambda with explanatory
 comment for little brains

---
 Makefile |  2 +-
 mush.ino | 51 ++++++++++++++++++++++++++++++---------------------
 2 files changed, 31 insertions(+), 22 deletions(-)

diff --git a/Makefile b/Makefile
index 28fb21d..faa38e0 100644
--- a/Makefile
+++ b/Makefile
@@ -48,7 +48,7 @@ compile: $(ELF)
 $(BIN) $(ELF): $(SRC) $(HDRS)
 	$(cli) compile --warnings all
 
-upload:
+upload: $(ELF)
 	$(cli) upload -p "$(SERIAL_DEV)"
 
 PLAT_PATH != $(cli) compile --show-properties | sed -ne 's/^runtime.platform.path=//p'
diff --git a/mush.ino b/mush.ino
index 4400420..4ce6ef9 100644
--- a/mush.ino
+++ b/mush.ino
@@ -24,10 +24,6 @@ WiFiClient *wific = 0;
 #define DHTTYPE DHT11
 DHT dht(DHTPIN, DHTTYPE);
 
-/*
- * IIC address default 0x5A, the address becomes 0x5B if the ADDR_SEL is soldered.
- */
-//CCS811 sensor(&Wire, /*IIC_ADDRESS=*/0x5A);
 CCS811 sensor;
 
 void setup(void)
@@ -57,6 +53,10 @@ void writeBoth(char *buf)
   }
 }
 
+const int readings_per_second = 3;
+const int seconds_to_average = 5;
+const size_t readings_size = seconds_to_average * readings_per_second;
+
 struct SensorState
 {
   float last_reading;
@@ -65,19 +65,27 @@ struct SensorState
   void record(float r) {
     last_reading = r;
     readings.push_back(r);
-    if (readings.size() > 12)
+    if (readings.size() > readings_size)
       {
         readings.pop_front();
       }
   };
   float avg()
   {
-    return std::accumulate(readings.begin(), readings.end(), 0.0) / readings.size();
-  }
-
+    int n = 0;
+    float total = std::accumulate(readings.begin(),                                 // float total = 0;
+                                  readings.end(),                                   // for (auto p = readings.begin(); p != readings.end(); ++p)
+                                  0.0,                                              //   {
+                                  [&n](float sum, int x) {                          //     if (!isnan(*p)) {
+                                    if (isnan(x)) return sum; ++n; return sum + x;  //       total += *p;
+                                  });                                               //       ++n;
+                                                                                    //     }
+                                                                                    //   }
+    return n ? total / n : NAN;
+  };
 };
 
-struct TemperatureSensor : public SensorState { virtual void sense() { record(dht.readTemperature()); } };
+struct TemperatureSensor : public SensorState { virtual void sense() { record(dht.readTemperature(true)); } };
 struct HumiditySensor    : public SensorState { virtual void sense() { record(dht.readHumidity()); } };
 struct PhotoSensor       : public SensorState { virtual void sense() { record(analogRead(PHOTORESISTOR)); } };
 struct CO2Sensor         : public SensorState { virtual void sense() { record(sensor.getCO2PPM()); } };
@@ -91,18 +99,17 @@ TVOCSensor         tVOCSensor;
 
 void log_reading()
 {
-  float    temp_c       = temperatureSensor.last_reading;
-  float    humidity     = humiditySensor.last_reading;
-  float    heat_index_c = dht.computeHeatIndex(temp_c, humidity, false);
+  float    temp         = temperatureSensor.avg();
+  float    humidity     = humiditySensor.avg();
+  float    heat_index   = dht.computeHeatIndex(temp, humidity, true);
   int      photons      = photoSensor.avg();
-  uint32_t co2          = cO2Sensor.last_reading;
-  uint32_t tvoc         = tVOCSensor.last_reading;
+  uint32_t co2          = cO2Sensor.avg();
+  uint32_t tvoc         = tVOCSensor.avg();
 
   auto fmt = "T: %.2f H: %.2f HI: %.2f Light: %d CO2: %u TVOC: %u\r\n";
   char buf[500];
 
-
-  snprintf(buf, sizeof(buf), fmt, temp_c, humidity, heat_index_c, photons, co2, tvoc);
+  snprintf(buf, sizeof(buf), fmt, temp, humidity, heat_index, photons, co2, tvoc);
   writeBoth(buf);
 }
 
@@ -127,11 +134,13 @@ void loop()
     wific->connect(ip, port);
   }
 
-  sensor_loop();
-
-  log_reading();
-
-  delay(1000);
+  for (int i=0; i<readings_per_second; ++i)
+    {
+      sensor_loop();
+      if (i == readings_per_second - 1)
+        log_reading();
+      delay(1000 / readings_per_second);
+    }
 }
 
 
-- 
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