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--- projects:lasercutterfilterpdmonitor [2018/12/15 15:27]
branth [Laser Cutter Exhaust Filter Pressure Drop Monitor]
+++ projects:lasercutterfilterpdmonitor [2024/01/08 13:35] (current)
branth [Readings]
@@ Line 1: / Line 1: @@
 ====== Laser Cutter Exhaust Filter Pressure Drop Monitor ======
-{{:projects:pdmonitor:1209181829b.jpg?100|}}
+{{:projects:pdmonitor:pxl_20230813_171245724.jpg?200|}}
-{{:projects:pdmonitor:1212181917.jpg?200|}}
+{{:projects:pdmonitor:pxl_20230813_171250060.jpg?200|}}
-{{:projects:pdmonitor:1125181043.jpg?200|}}
 ===== Purpose =====
   * Monitor the performance and effectiveness of filters
@@ Line 10: / Line 9: @@
   * Built/tested 11/25/18
   * Installed 12/09/18
+  * Removed ???
+  * Revamped 7/27/23
 ===== Readings =====
-^ Date  ^ Stage 1 PD  ^ Stage 2 PD ^ Stage 3 PD ^
+^ Date  ^ Stage 1 PD  ^ Stage 2 PD ^ Stage 3 PD ^ Comments ^
-|12/12/18|    0.40    |    2.15    |    0.90    |
+|12/12/18|    0.40    |    2.15    |    0.90    | |
-|12/15/18|    0.00    |    0.00    |    0.00    |
+|12/15/18|    0.17    |    1.18    |    0.56    | |
+|12/29/18|    0.19    |    1.25    |    0.54    | |
+|01/02/19|    0.22    |    1.20    |    0.62    | |
+|01/12/19|    0.28    |    1.16    |    0.32    | Markus changed out the Stage 1 filter |
+|01/15/19|    0.31    |    1.12    |    0.78    | |
+|01/20/19|    0.18    |    1.15    |    0.32    | |
+|01/23/19|    0.44    |    1.12    |    0.31    | |
+|02/07/19|    0.66    |    1.13    |    0.34    | |
+|03/02/19|    1.37    |    1.13    |    0.32    | |
+|03/08/19|    1.45    |    1.16    |    0.30    | |
+|03/10/19|    0.96    |    1.20    |    0.23    | Brant changed out the Stage 1 filter |
+|03/14/19|    0.98    |    1.16    |    0.31    | |
+|03/22/19|    1.07    |    1.17    |    0.35    | |
+|03/22/19|    1.01    |    1.25    |    0.22    | Markus replaced the Stage 1 filter with a 12" deep model |
+|05/10/19|    1.14    |    1.22    |    0.32    |
+|07/11/19|    1.78    |    0.00    |    0.32    | Stage 2 removed? |
+|07/21/19|    1.80    |    0.00    |    0.30    |  |
+|08/25/19|    1.85    |    0.00    |    0.30    |  |
+|10/27/19|    1.99    |    0.28    |    0.60    | |
+|01/26/20|    2.15    |    0.27    |    2.59    | Wood floor installed, room rearranged|
+|?|    ?    |    ?    |    ?    | Removed|
+|07/27/23|    0.25    |    0.03    |    0.00    | Revamped, no can filter |
+|08/13/23|    0.27    |    0.06    |    0.00    |  |
+|09/02/23|    0.17    |    0.01    |    0.01    | Before leaks in flex ducts were found |
+|09/02/23|    0.18    |    0.01    |    0.24    | After leaks fixed |
+|09/09/23|    0.27    |    0.27    |    0.30    | All new filters installed |
+|09/10/23|    0.27    |    0.28    |    0.35    |  |
+|10/07/23|    0.27    |    0.27    |    0.05    | Can filter removed |
+|10/15/23|    0.41    |    0.28    |    0.15    | New can filter with cloth cover |
+|12/09/23|    1.32    |    0.28    |    0.25    | Tubing swapped incorrectly, now fixed |
+|12/28/23|    1.25    |    0.28    |    0.25    | |
+|01/05/24|    1.22    |    0.28    |    0.25    | |
+|01/07/24|    0.05    |    0.28    |    0.25    | Raymond cleaned the filters during SID, Brant connected new ductwork |
 All values measured in inches of water column (in.w.c.)\\
-Measurements include pressure sensor correction factors (Stg1=-0.26, Stg2=-0.28, Stg3=-0.24)
+The signals used to read this when no air was flowing (Stg1=-0.26, Stg2=-0.28, Stg3=-0.24)\\
+Signal calibration factors are now included in the programming\\
 ===== Design/Construction =====
   * Designed/built by [[members:brantholeman|BrantH]]
-  * Uses three differential pressure transducers, 5 VDC, 20 mA, American Science & Surplus #46251P2
+  * Uses three differential pressure transducers, 5 VDC, 20 mA
-  * Arduino Uno v.3 with code borrowed from various sources
+      * [[https://sciplus.com/5vdc-fluid-pressure-sensors-pkg-2/|American Science & Surplus #    SZZ99946251P0002]]
+      * [[http://www.kavlico.com/kavlico-pressure/pressure-products/silicon-capacitive-pressure-sensors/p992|Kavlico P992-5008 series silicon capacitive sensor]]
   * Custom shield (a very crappy perforated board with several wire/solder connections)
   * Scrap metal enclosure box is a salvaged air conditioner relay box from Brant's attic
+  * Arduino Uno v.3 with code borrowed from various sources ( Smoothing by David A. Mellis, LCD Library by Limor Fried and Tom Igoe )
+  * Arduino takes 10 readings from each sensor, averages them, then displays the average, updates once every second
+<code>
+/*
+  LiquidCrystal Library - display() and noDisplay()
+ Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
+ library works with all LCD displays that are compatible with the
+ Hitachi HD44780 driver. There are many of them out there, and you
+ can usually tell them by the 16-pin interface.
+ This sketch prints "Hello World!" to the LCD and uses the
+ display() and noDisplay() functions to turn on and off
+ the display.
+ The circuit:
+ * LCD RS pin 4 to digital pin 12
+ * LCD Enable pin to digital pin 11
+ * LCD D4 pin to digital pin 5
+ * LCD D5 pin to digital pin 4
+ * LCD D6 pin to digital pin 3
+ * LCD D7 pin to digital pin 2
+ * LCD R/W pin to ground
+ * 10K resistor:
+ * ends to +5V and ground
+ * wiper to LCD VO pin (pin 3)
+ Library originally added 18 Apr 2008
+ by David A. Mellis
+ library modified 5 Jul 2009
+ by Limor Fried (http://www.ladyada.net)
+ example added 9 Jul 2009
+ by Tom Igoe
+ modified 22 Nov 2010
+ by Tom Igoe
+ This example code is in the public domain.
+ http://arduino.cc/en/Tutorial/LiquidCrystalDisplay
+ */
+// include the library code:
+#include <LiquidCrystal.h>
+// initialize the library with the numbers of the interface pins
+LiquidCrystal lcd(12, 11, 10, 9,8,7,6,5,4,3,2);
+int sensorAPin = A1;
+int sensorBPin = A2;
+int sensorCPin = A3;
+double PDA = 0;
+double PDB = 0;
+double PDC = 0;
+int lifeA = 0;
+int lifeB = 0;
+int lifeC = 0;
+const int numReadingsA = 10;
+int readingsA[numReadingsA];      // the readings from the analog inputs
+int readIndexA = 0;              // the index of the current readings
+int totalA = 0;                  // the running total
+int averageA = 0;                // the average
+const int numReadingsB = 10;
+int readingsB[numReadingsB];      // the readings from the analog inputs
+int readIndexB = 0;              // the index of the current readings
+int totalB = 0;                  // the running total
+int averageB = 0;                // the average
+const int numReadingsC = 10;
+int readingsC[numReadingsC];      // the readings from the analog inputs
+int readIndexC = 0;              // the index of the current readings
+int totalC = 0;                  // the running total
+int averageC = 0;                // the average
+void setup() {
+  for (int thisReading = 0; thisReading < numReadingsA; thisReading++) {
+  readingsA[thisReading] = 0;
+}
+}
+void loop() {
+  // set up the LCD's number of columns and rows:
+  lcd.begin(20, 4);
+  // Print a message to the LCD.
+  lcd.setCursor(0, 0);
+  lcd.print("Filter Life Monitor");
+  lcd.setCursor(0, 1);
+  lcd.print("Base:");
+  lcd.print(PDA);
+  lcd.print(" ");
+  lcd.print(lifeA);
+  lcd.print("% loaded");
+  lcd.setCursor(0, 2);
+  lcd.print("HEPA:");
+  lcd.print(PDB);
+  lcd.print(" ");
+  lcd.print(lifeB);
+  lcd.print("% loaded");
+  lcd.setCursor(0, 3);
+  lcd.print("Can:");
+  lcd.print(PDC);
+  lcd.print(" ");
+  lcd.print(lifeC);
+  lcd.print("% loaded");
+  //adjust for sensor calibration
+  PDA = abs((averageA / 1023.00 * 5.00) - 0.27);
+  PDB = abs((averageB / 1023.00 * 5.00) - 0.28);
+  PDC = abs((averageC / 1023.00 * 5.00) - 0.25);
+  // SENSOR A
+  // subtract the last reading:
+  totalA = totalA - readingsA[readIndexA];
+  // read from the sensor:
+  readingsA[readIndexA] = analogRead(sensorAPin);
+  // add the reading to the total:
+  totalA = totalA + readingsA[readIndexA];
+  // advance to the next position in the array:
+  readIndexA = readIndexA + 1;
+  // if we're at the end of the array...
+  if (readIndexA >= numReadingsA) {
+    // ...wrap around to the beginning:
+    readIndexA = 0;}
+  // calculate the average:
+  averageA = totalA / numReadingsA;
+  // SENSOR B
+  // subtract the last reading:
+  totalB = totalB - readingsB[readIndexB];
+  // read from the sensor:
+  readingsB[readIndexB] = analogRead(sensorBPin);
+  // add the reading to the total:
+  totalB = totalB + readingsB[readIndexB];
+  // advance to the next position in the array:
+  readIndexB = readIndexB + 1;
+  // if we're at the end of the array...
+  if (readIndexB >= numReadingsB) {
+    // ...wrap around to the beginning:
+    readIndexB = 0;}
+  // calculate the average:
+  averageB = totalB / numReadingsB;
+  // send it to the computer as ASCII digits
+    // SENSOR C
+  // subtract the last reading:
+  totalC = totalC - readingsC[readIndexC];
+  // read from the sensor:
+  readingsC[readIndexC] = analogRead(sensorCPin);
+  // add the reading to the total:
+  totalC = totalC + readingsC[readIndexC];
+  // advance to the next position in the array:
+  readIndexC = readIndexC + 1;
+  // if we're at the end of the array...
+  if (readIndexC >= numReadingsC) {
+    // ...wrap around to the beginning:
+    readIndexC = 0;}
+  // calculate the average:
+  averageC = totalC / numReadingsC;
+  // send it to the computer as ASCII digits
+  //end of life filter section pressure drops
+int deadA = 200; //can filter
+int deadB = 150; //HEPA
+int deadC = 80; //entry
+  // estimate remaining life
+  lifeA = (PDA*100 / deadA) * 100;
+  lifeB = (PDB*100 / deadB) * 100;
+  lifeC = (PDC*100 / deadC) * 100;
+  delay(1000);
+}
+</code>
+Old photos:\\
+{{:projects:pdmonitor:1209181829b.jpg?100|}}
+{{:projects:pdmonitor:1212181917.jpg?200|}}
+{{:projects:pdmonitor:1125181043.jpg?200|}}

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