Checks now status of temperature controller relais
output
This commit is contained in:
Markus Rosenstihl
parent
0e43ea9758
commit
6ea36736ed
291
pfg_security.ino
291
pfg_security.ino
@ -1,78 +1,101 @@
|
||||
#include <limits.h>
|
||||
// Needed for LiquidCrystal_I2C.h
|
||||
#include <Wire.h>
|
||||
// from https://bitbucket.org/fmalpartida/new-liquidcrystal/downloads/
|
||||
#include <LiquidCrystal_I2C.h>
|
||||
#include <SPI.h>
|
||||
#include <TFT.h>
|
||||
//#include <SD.h>
|
||||
// display setup
|
||||
|
||||
#define CS 18
|
||||
#define DC 19
|
||||
#define RESET 17
|
||||
|
||||
|
||||
// as per http://funduino.de/nr-06-zwei-i%C2%B2c-displays-gleichzeitig
|
||||
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);
|
||||
|
||||
boolean setup_ok=true; // false will stop loop()
|
||||
// create an instance of the library
|
||||
TFT TFTscreen = TFT(CS, DC, RESET);
|
||||
|
||||
boolean setup_ok = true;
|
||||
const int N = 16; // number of sample averages
|
||||
volatile unsigned int deltas[N]; // array of time deltas between interrupt
|
||||
volatile unsigned int n = 0; // run variable
|
||||
unsigned long total;
|
||||
float flow;
|
||||
int prescaler;
|
||||
char buff[10]; // temp. buffer for string manipulation/formatting
|
||||
char serialbuff[16]; // temp. buffer for string manipulation/formatting
|
||||
struct rgb {
|
||||
int red=0;
|
||||
int green=0;
|
||||
int blue=0;
|
||||
};
|
||||
|
||||
|
||||
|
||||
// begin user configuration parameters
|
||||
/*
|
||||
User configuration
|
||||
==================
|
||||
|
||||
Flow meter
|
||||
==========
|
||||
|
||||
The PFG flow meter can measure from 0.24 to 17 l/min at 4 pulses/s per l/min
|
||||
max period about 1s, i.e. min flow of 0.24l/min
|
||||
min period about 15 ms i.e. max flow of 17l/min
|
||||
|
||||
This is the prescaler setting for timer1:
|
||||
The time base of the timer counter TCNT1
|
||||
t_step or seconds/tick = prescaler/clock
|
||||
|
||||
Note: Maximum TCNT1 value is 65535, i.e.
|
||||
Maximum time lengths (and thus timeouts) per prescaler value are:
|
||||
Maximum time lengths (and thus timeouts) are:
|
||||
8 0.0327675 s
|
||||
64 0.26214 s
|
||||
256 1.04856 s
|
||||
1024 4.19424 s
|
||||
*/
|
||||
#define PRESCALER 256 // todo: make this dependent on timeout
|
||||
|
||||
For accuracy the prescaler is set automatically fitting to the TIMEOUT.
|
||||
/*
|
||||
The flow meter can measure from 0.24 to 17 l/min at 4 pulses/s per l/min
|
||||
max period about 1s, i.e. min flow of 0.24l/min
|
||||
min period about 15 ms i.e. max flow of 17l/min
|
||||
*/
|
||||
#define TIMEOUT 1.0 // measurement timeout in Hz (needs to be less than timer1 limits above)
|
||||
#define DISPLAY_INTERVAL 1.0 // display update interval (and serial send interval)
|
||||
|
||||
const float conversion = 4.0; // conversion factor, pulses/s per l/min
|
||||
const float flow_threshold = 1.0; // alarm threshold for flow
|
||||
const float flow_threshold = 0.5; // alarm threshold for flow
|
||||
// end user configuration parameters
|
||||
|
||||
|
||||
/*
|
||||
Hardware configuration / wiring setup
|
||||
=====================================
|
||||
// begin hardware configuration / wiring setup
|
||||
// Pin 13 has an LED connected on most Arduino boards.
|
||||
// alarm LED pin
|
||||
#define ALARM_LED_PIN 4
|
||||
// interlock pin
|
||||
#define INTERLOCK_PIN 5
|
||||
#define OVERTEMP_PIN 14
|
||||
|
||||
Pin 13 has an LED connected on most Arduino boards.
|
||||
This is the alarm LED pin
|
||||
*/
|
||||
#define ALARM_LED_PIN 13
|
||||
// interlock output pin
|
||||
#define INTERLOCK_PIN 12
|
||||
// end hardware configuration / wiring setup
|
||||
|
||||
|
||||
/*
|
||||
Setup routine
|
||||
=============
|
||||
// temp. buffer for string manipulation/formatting
|
||||
char buff[10];
|
||||
char old_flow_string[32];
|
||||
char new_flow_string[32];
|
||||
char old_status_string[16] = "yyyyyyyyyyyyyyy";
|
||||
char new_status_string[16];
|
||||
|
||||
|
||||
boolean status_change = true;
|
||||
boolean status_safety = false;
|
||||
|
||||
Run once upon startup
|
||||
*/
|
||||
void setup()
|
||||
{
|
||||
lcd.begin(16,2); // start LCD (16x2 characters)
|
||||
lcd.home (); // go home
|
||||
lcd.print("PFG security"); // string first line
|
||||
lcd.setCursor ( 0, 1 ); // go to the next line
|
||||
lcd.print (""); // string second line
|
||||
SPI.setClockDivider(SPI_CLOCK_DIV2);
|
||||
TFTscreen.begin();
|
||||
// clear the screen with a black background
|
||||
struct rgb bg;
|
||||
bg.red = 0;
|
||||
bg.green = 0;
|
||||
bg.blue = 0;
|
||||
TFTscreen.background(bg.red, bg.green, bg.blue);
|
||||
// write the static text to the screen
|
||||
// set the font color to white
|
||||
TFTscreen.stroke(255, 255, 255);
|
||||
// set the font size
|
||||
TFTscreen.setTextSize(2);
|
||||
// write the text to the top left corner of the screen
|
||||
TFTscreen.text("PFG Safety", 0, 0);
|
||||
|
||||
|
||||
Serial.begin(19200); // serial line speed
|
||||
/* Interrupt pins
|
||||
UNO:
|
||||
@ -82,12 +105,10 @@ void setup()
|
||||
attachInterrupt(0, get_time, FALLING);
|
||||
pinMode(ALARM_LED_PIN, OUTPUT);
|
||||
pinMode(INTERLOCK_PIN, OUTPUT);
|
||||
pinMode(OVERTEMP_PIN, INPUT);
|
||||
|
||||
/*
|
||||
Set sensible default starting values for the deltas array,
|
||||
otherwise the array values are maybe zero at the beginning
|
||||
and we get very high (wrong) flow values.
|
||||
*/
|
||||
// starting values for the deltas array
|
||||
// otherwise the array values are maybe zero at the beginning and we get very high (wrong) flow values
|
||||
for (int k = 0; k < N; k++) {
|
||||
deltas[k] = UINT_MAX;
|
||||
}
|
||||
@ -96,28 +117,13 @@ void setup()
|
||||
timer1 setup
|
||||
*/
|
||||
|
||||
// select prescaler according to TIMEOUT
|
||||
if (TIMEOUT < 0.0327675)
|
||||
prescaler = 8;
|
||||
else if (TIMEOUT < 0.26214)
|
||||
prescaler = 64;
|
||||
else if (TIMEOUT < 1.04856)
|
||||
prescaler = 256;
|
||||
else if (TIMEOUT < 4.19424)
|
||||
prescaler = 1024;
|
||||
else {
|
||||
lcd.setCursor (0,1); // char 0 on line 0 or 1
|
||||
lcd.print ("ERR TIMEOUT BIG");
|
||||
setup_ok=false;
|
||||
return;
|
||||
}
|
||||
|
||||
noInterrupts(); // disable all interrupts
|
||||
// clear timer1 registers
|
||||
TCCR1A = 0;
|
||||
TCCR1B = 0;
|
||||
TCNT1 = 0; // timer1 counter, reset on every HW interrupt from the flow meter (see get_time function)
|
||||
OCR1A = (int)(16e6/prescaler*TIMEOUT);// Clear timer on compare match value: 16MHz/PRESCALER*timeout(in s)
|
||||
TCNT1 = 0; // timer1 counter, reset on every HW interrupt pulse from the flow meter (see get_time function)
|
||||
OCR1A = (int)(16e6 / PRESCALER * TIMEOUT); // Clear timer on compare match 16MHz/PRESCALER*timeout(in s)
|
||||
TCCR1B |= (1 << WGM12); // CTC mode (Clear Timer on Compare Match)
|
||||
/*
|
||||
Prescaler settings x=0,1,2 (Timer0, Timer1, Timer2)
|
||||
@ -127,22 +133,60 @@ void setup()
|
||||
1 0 0 Clk/256 (1 << CS12)
|
||||
1 0 1 Clk/1024 (1 << CS12)|(1 << CS10)
|
||||
*/
|
||||
if (prescaler == 8)
|
||||
if (PRESCALER == 8) {
|
||||
TCCR1B |= (1 << CS11);
|
||||
else if (prescaler == 64)
|
||||
if (TIMEOUT > 0.0327675) {
|
||||
interrupts();
|
||||
//lcd.setCursor (0,1); // char 0 on line 0 or 1
|
||||
//lcd.print ("CFGERR TIMEOUT");
|
||||
setup_ok = false;
|
||||
return;
|
||||
}
|
||||
}
|
||||
else if (PRESCALER == 64) {
|
||||
if (TIMEOUT > 0.26214) {
|
||||
interrupts();
|
||||
//lcd.setCursor (0,1); // char 0 on line 0 or 1
|
||||
//lcd.print ("CFGERR TIMEOUT");
|
||||
setup_ok = false;
|
||||
return;
|
||||
}
|
||||
TCCR1B |= (1 << CS11) | (1 << CS10);
|
||||
else if (prescaler == 256)
|
||||
}
|
||||
else if (PRESCALER == 256) {
|
||||
if (TIMEOUT > 1.04856) {
|
||||
interrupts();
|
||||
//lcd.setCursor (0,1); // char 0 on line 0 or 1
|
||||
//lcd.print ("CFGERR TIMEOUT");
|
||||
setup_ok = false;
|
||||
return;
|
||||
}
|
||||
TCCR1B |= (1 << CS12);
|
||||
else if (prescaler == 1024)
|
||||
}
|
||||
else if (PRESCALER == 1024) {
|
||||
if (TIMEOUT > 4.19424) {
|
||||
interrupts();
|
||||
//lcd.setCursor (0,1); // char 0 on line 0 or 1
|
||||
//lcd.print ("CFGERR TIMEOUT");
|
||||
setup_ok = false;
|
||||
return;
|
||||
}
|
||||
TCCR1B |= (1 << CS12) | (1 << CS10);
|
||||
|
||||
}
|
||||
else {
|
||||
interrupts();
|
||||
// lcd.setCursor (0,1); // char 0 on line 0 or 1
|
||||
// lcd.print ("CFGERR prescaler");
|
||||
setup_ok = false;
|
||||
return;
|
||||
}
|
||||
TIMSK1 |= (1 << OCIE1A); // enable timer compare interrupt
|
||||
interrupts(); // enable all interrupts
|
||||
delay(500);
|
||||
delay(100);
|
||||
}
|
||||
|
||||
// if after OCR1A seconds no pulse from flow meter occured an interrupt will force a very high delta value
|
||||
ISR(TIMER1_COMPA_vect) { // interupt service routine which will be called when an interrupt occurs at timer1
|
||||
ISR(TIMER1_COMPA_vect) { // function which will be called when an interrupt occurs at timer1
|
||||
deltas[n] = UINT_MAX; // add maximum value in the current array position
|
||||
n++;
|
||||
if (n == N) n = 0; // wrap around
|
||||
@ -150,8 +194,9 @@ ISR(TIMER1_COMPA_vect) { // interupt service routine which will be called when a
|
||||
|
||||
void loop()
|
||||
{
|
||||
struct rgb bg;
|
||||
if (!setup_ok) return;
|
||||
delay((int) (DISPLAY_INTERVAL*1000));
|
||||
|
||||
total = 0;
|
||||
// sum up all deltas in array
|
||||
for (int k = 0; k < N; k++) {
|
||||
@ -162,45 +207,109 @@ void loop()
|
||||
}
|
||||
total += deltas[k];
|
||||
}
|
||||
// calculate average flow
|
||||
flow = N/(float)total/conversion*16e6/prescaler;
|
||||
// and calculate average flow
|
||||
flow = N / (float)total / conversion * 16e6 / PRESCALER;
|
||||
|
||||
// flow
|
||||
//flow = total/N/conversion;
|
||||
// format decimal value and save string in buff
|
||||
dtostrf(flow, 5, 3, buff);
|
||||
|
||||
/*
|
||||
Security logic
|
||||
==============
|
||||
/* security logic
|
||||
|
||||
If flow is too small,i.e. flow < flow_threshold:
|
||||
if flow is too small,i.e. flow < flow_threshold:
|
||||
a) alarm LED on
|
||||
b) interlock LOW
|
||||
|
||||
*/
|
||||
|
||||
if (flow < flow_threshold) {
|
||||
digitalWrite(ALARM_LED_PIN, HIGH);
|
||||
digitalWrite(INTERLOCK_PIN, LOW);
|
||||
snprintf(serialbuff, sizeof(serialbuff), "ERR %s l/min",buff );
|
||||
strcpy(old_flow_string, new_flow_string);
|
||||
strcpy(old_status_string, new_status_string);
|
||||
|
||||
snprintf(new_flow_string, sizeof(new_flow_string), "%s l/min", buff );
|
||||
Serial.println(new_flow_string); // transmit flow
|
||||
|
||||
|
||||
|
||||
|
||||
if ((flow < flow_threshold) ||digitalRead(OVERTEMP_PIN) ) { // flow too small, rise alarm
|
||||
if (status_safety == true) {
|
||||
status_change = true;
|
||||
}
|
||||
else {
|
||||
status_change = false;
|
||||
}
|
||||
status_safety = false;
|
||||
digitalWrite(ALARM_LED_PIN, HIGH);
|
||||
digitalWrite(INTERLOCK_PIN, LOW);
|
||||
//if (status_change) {
|
||||
bg.red=255;
|
||||
bg.green=0;
|
||||
bg.blue=0;
|
||||
TFTscreen.background(bg.red, bg.green, bg.blue);
|
||||
//}
|
||||
if (digitalRead(OVERTEMP_PIN))
|
||||
snprintf(new_status_string, sizeof(new_status_string), "Status: %s", "TEMP!" );
|
||||
else
|
||||
snprintf(new_status_string, sizeof(new_status_string), "Status: %s", "FLOW!" );
|
||||
|
||||
}
|
||||
else {
|
||||
if (status_safety == false) {
|
||||
status_change = true;
|
||||
}
|
||||
else {
|
||||
status_change = false;
|
||||
}
|
||||
status_safety = true;
|
||||
digitalWrite(ALARM_LED_PIN, LOW);
|
||||
digitalWrite(INTERLOCK_PIN, HIGH);
|
||||
snprintf(serialbuff, sizeof(serialbuff), "OK %s l/min",buff );
|
||||
if (status_change) {
|
||||
bg.red=0;
|
||||
TFTscreen.background(bg.red, bg.green, bg.blue);
|
||||
//TFTscreen.text("Status:", 0, 20);
|
||||
//TFTscreen.text("l/min", 6 *((20+2)/2), 40);
|
||||
}
|
||||
Serial.println(serialbuff); // transmit flow
|
||||
snprintf(new_status_string, sizeof(new_status_string), "Status: %s", "OK" );
|
||||
|
||||
lcd.home();
|
||||
lcd.print (serialbuff); // display flow
|
||||
lcd.setCursor (0,1); // char 0 on line 0 or 1
|
||||
//delay(DISPLAY_INTERVAL*1000);
|
||||
dtostrf(flow_threshold,5,3,buff);
|
||||
snprintf(serialbuff, sizeof(serialbuff), "THR %s l/min",buff );
|
||||
lcd.print(serialbuff); // display threshold
|
||||
}
|
||||
|
||||
//Serial.begin(19200); // serial line speed
|
||||
//Serial.println(new_status_string); // transmit flow
|
||||
//Serial.end();
|
||||
|
||||
writeText(new_status_string, old_status_string, 2, 8 * ((20 + 2) / 2) * 0, 20, bg);
|
||||
writeText(new_flow_string, old_flow_string, 2, 0, 40, bg);
|
||||
delay((int) (DISPLAY_INTERVAL * 1000));
|
||||
|
||||
|
||||
}
|
||||
|
||||
void writeText(char* newtext, char* oldtext, int textWidth, int x, int y, struct rgb bg) {
|
||||
TFTscreen.setTextSize(textWidth);
|
||||
int n = 13; //max(strlen(newtext),strlen(oldtext));
|
||||
int charWidth = textWidth * 10 / 2 + 2;
|
||||
int curPos = x;
|
||||
for (int i = 0; i < n; i++) {
|
||||
if ((oldtext[i] != newtext[i]) && (i < strlen(oldtext))) { // only write changed characters
|
||||
// delete old char
|
||||
TFTscreen.stroke(0, 0, 0);
|
||||
TFTscreen.text(&oldtext[i], curPos, y);
|
||||
}
|
||||
// write new char
|
||||
TFTscreen.stroke(255, 255, 255);
|
||||
TFTscreen.text(&newtext[i], curPos, y);
|
||||
// draw a rectangle to the end of the screen
|
||||
if (i >= strlen(newtext)) {
|
||||
TFTscreen.stroke(bg.red, bg.green, bg.blue);
|
||||
TFTscreen.rect(curPos, y, TFTscreen.width() - curPos, textWidth * 10);
|
||||
break;
|
||||
}
|
||||
// advance position
|
||||
curPos += charWidth;
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
void get_time() {
|
||||
deltas[n] = TCNT1; // save current timer1 count
|
||||
|
||||
Loading…
Reference in New Issue
Block a user