WoundVARduino

Arduino Uno-based device intended for negative wound pressure therapy for hospitals in the developing parts of the world.

Jun 21, 2019

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25 respects

Components and supplies

Resistor 221 ohm

MXP5500 Pressure sensor

General Purpose Transistor NPN

Resistor 1k ohm

12V Pump (25KPa minimum)

Automotive Relay, 12 VDC

1N4007 – High Voltage, High Current Rated Diode

LED (generic)

Multi-Turn Precision Potentiometer- 10k ohms (25 Turn)

Linear Regulator (7805)

Arduino UNO

Signal Relay, 5 VDC

Project description

Code

WoundVARduino

arduino

1. You may need to adjust the offset by writing a serial print function with your board attached to the computer. 2. You may need to attach a column of water to the system to measure and adjust the pressure conversion formula. Depending on your sensor you may need to change the 7.50062 number.

1int rawValue; // A/D readings
2int offset =  40; // zero pressure adjust
3int   fullScale = 930; // max pressure (span) adjust
4float pressure; // final pressure
5
6void   setup() {
7  pinMode(9, OUTPUT);
8  
9}
10
11void loop() {
12  rawValue   = analogRead(A0);
13  pressure = ((rawValue - offset) * 500.0 / (fullScale - offset))*7.50062;   // pressure conversion
14  delay(500); // delays readings
15
16 
17
18if (rawValue   < 50)    // if the pressure is less than 88mmHg turn motor on for 3 sec
19 { 
20   digitalWrite(9, HIGH);
21  delay(3000);
22  digitalWrite(9, LOW);
23 }
24
25
26
27else   if (rawValue < 75)      // if the pressure reading is less than 150 mmHg turn motor   on for 1 sec
28{
29  digitalWrite(9, HIGH);
30  delay(1000);
31  digitalWrite(9,   LOW);
32  delay(5000);
33}
34}
35

int rawValue; // A/D readings
int offset =  40; // zero pressure adjust
int   fullScale = 930; // max pressure (span) adjust
float pressure; // final pressure

void   setup() {
  pinMode(9, OUTPUT);
  
}

void loop() {
  rawValue   = analogRead(A0);
  pressure = ((rawValue - offset) * 500.0 / (fullScale - offset))*7.50062;   // pressure conversion
  delay(500); // delays readings

 

if (rawValue   < 50)    // if the pressure is less than 88mmHg turn motor on for 3 sec
 { 
   digitalWrite(9, HIGH);
  delay(3000);
  digitalWrite(9, LOW);
 }



else   if (rawValue < 75)      // if the pressure reading is less than 150 mmHg turn motor   on for 1 sec
{
  digitalWrite(9, HIGH);
  delay(1000);
  digitalWrite(9,   LOW);
  delay(5000);
}
}

WoundVARduino

arduino

1int rawValue; // A/D readings
2int offset =  40; // zero pressure adjust
3int
4  fullScale = 930; // max pressure (span) adjust
5float pressure; // final pressure
6
7void
8  setup() {
9  pinMode(9, OUTPUT);
10  
11}
12
13void loop() {
14  rawValue
15  = analogRead(A0);
16  pressure = ((rawValue - offset) * 500.0 / (fullScale - offset))*7.50062;
17  // pressure conversion
18  delay(500); // delays readings
19
20 
21
22if (rawValue
23  < 50)    // if the pressure is less than 88mmHg turn motor on for 3 sec
24 { 
25
26  digitalWrite(9, HIGH);
27  delay(3000);
28  digitalWrite(9, LOW);
29 }
30
31
32
33else
34  if (rawValue < 75)      // if the pressure reading is less than 150 mmHg turn motor
35  on for 1 sec
36{
37  digitalWrite(9, HIGH);
38  delay(1000);
39  digitalWrite(9,
40  LOW);
41  delay(5000);
42}
43}
44

int rawValue; // A/D readings
int offset =  40; // zero pressure adjust
int
  fullScale = 930; // max pressure (span) adjust
float pressure; // final pressure

void
  setup() {
  pinMode(9, OUTPUT);
  
}

void loop() {
  rawValue
  = analogRead(A0);
  pressure = ((rawValue - offset) * 500.0 / (fullScale - offset))*7.50062;
  // pressure conversion
  delay(500); // delays readings

 

if (rawValue
  < 50)    // if the pressure is less than 88mmHg turn motor on for 3 sec
 { 

  digitalWrite(9, HIGH);
  delay(3000);
  digitalWrite(9, LOW);
 }



else
  if (rawValue < 75)      // if the pressure reading is less than 150 mmHg turn motor
  on for 1 sec
{
  digitalWrite(9, HIGH);
  delay(1000);
  digitalWrite(9,
  LOW);
  delay(5000);
}
}

Downloadable files

PCB_VARduino

WoundVaRduino

Schematic

WoundVaRduino

WoundVARduino

The complete system housed in a project box.

WoundVARduino

PCB_VARduino

Collection Canister

This is the collection canister. It can be easily emptied and reused by a patient at home. One tube goes to the sensor, one to the pump, and the last tube connects to the patient's wound dressing

Collection Canister

WoundVaRduino

Schematic

WoundVaRduino

vacduino_Cdgq5u7AFx.jpg

Please forgive the sloppiness. I'm a PT not an engineer.

vacduino_Cdgq5u7AFx.jpg

WoundVARduino

The complete system housed in a project box.

WoundVARduino

Collection Canister

This is the collection canister. It can be easily emptied and reused by a patient at home. One tube goes to the sensor, one to the pump, and the last tube connects to the patient's wound dressing

Collection Canister

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jpaulmrphy

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