1 files changed, 64 insertions, 0 deletions
diff --git a/learning_examples/DSM501A-example-esp32-ehh-unreliable-CRAP/DSM501A-example-esp32-ehh-unreliable-CRAP.ino b/learning_examples/DSM501A-example-esp32-ehh-unreliable-CRAP/DSM501A-example-esp32-ehh-unreliable-CRAP.ino
new file mode 100644
index 0000000..b29a512
--- /dev/null
+++ b/learning_examples/DSM501A-example-esp32-ehh-unreliable-CRAP/DSM501A-example-esp32-ehh-unreliable-CRAP.ino
@@ -0,0 +1,64 @@
+#include<string.h>
+#define PM1PIN 18 //DSM501A input D6 on ESP8266
+#define PM25PIN 14 // ???? what
+byte buff[2];
+unsigned long durationPM1;
+unsigned long durationPM25;
+unsigned long starttime;
+unsigned long endtime;
+unsigned long sampletime_ms = 30000;
+unsigned long lowpulseoccupancyPM1 = 0;
+unsigned long lowpulseoccupancyPM25 = 0;
+
+ 
+int i=0;
+void setup()
+{
+  Serial.begin(9600);
+  Serial.println("Starting please wait 30s");
+  pinMode(PM1PIN,INPUT);
+  pinMode(PM25PIN,INPUT);
+  starttime = millis(); 
+}
+
+float calculateConcentration(long lowpulseInMicroSeconds, long durationinSeconds){
+  
+  float ratio = (lowpulseInMicroSeconds/1000000.0)/30.0*100.0; //Calculate the ratio
+  float concentration = 0.001915 * pow(ratio,2) + 0.09522 * ratio - 0.04884;//Calculate the mg/m3
+  Serial.print("lowpulseoccupancy:");
+  Serial.print(lowpulseInMicroSeconds);
+  Serial.print("    ratio:");
+  Serial.print(ratio);
+  Serial.print("    Concentration:");
+  Serial.println(concentration);
+  return concentration;
+}
+
+void loop()
+{
+  durationPM1 = pulseIn(PM1PIN, LOW);
+  durationPM25 = pulseIn(PM25PIN, LOW);
+  
+  lowpulseoccupancyPM1 += durationPM1;
+  lowpulseoccupancyPM25 += durationPM25;
+  
+  endtime = millis();
+  if ((endtime-starttime) > sampletime_ms) //Only after 30s has passed we calcualte the ratio
+  {
+    // ratio1 = (lowpulseoccupancy/1000000.0)/30.0*100.0; //Calculate the ratio
+    // Serial.print("ratio1: ");
+    // Serial.println(ratio1);
+    
+    // concentration = 0.001915 * pow(ratio1,2) + 0.09522 * ratio1 - 0.04884;//Calculate the mg/m3
+
+    float conPM1 = calculateConcentration(lowpulseoccupancyPM1,30);
+    float conPM25 = calculateConcentration(lowpulseoccupancyPM25,30);
+    Serial.print("PM1 ");
+    Serial.print(conPM1);
+    Serial.print("  PM25 ");
+    Serial.println(conPM25); // this is pretty negative:)
+    lowpulseoccupancyPM1 = 0;
+    lowpulseoccupancyPM25 = 0;
+    starttime = millis();
+  } 
+}