WoundVARduino

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

Jun 21, 2019

•

20179 views

•

25 respects

Devices & Components

Arduino Uno Rev3

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)

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

Comments

Only logged in users can leave comments

jpaulmrphy

0 Followers

•

0 Projects

Intro