![\"DSC_5657\"](\"https:\/\/pa3csg.nl\/wp-content\/uploads\/2017\/03\/DSC_5657-300x151.jpg\")
<\/p>\nFor my 23cm PA consisting of 4 PA’s I needed a temperature meter with protection in case the amplifier gets hot. The system is build on the same board as the power meter. The full scale temperature can be set with a push button.<\/p>\n
<\/p>\n
The code derived from the power \/ swr meter.<\/p>\n
\/*
\nTemperature meter based on the powermeter swrmeter board, connections for
\npushbuttons leds etc. remain the same as on the original board
\nPA3CSG march 2017 V1.0
\nCode comes without any warranty.<\/p>\n
***********************CHANGELOG****************************************<\/p>\n
************************************************************************
\n*\/<\/p>\n
\/\/ include the library code:
\n#include <LiquidCrystal.h>
\n#include <EEPROM.h>
\n#include <LcdBarGraph.h><\/p>\n
\/\/ initialize the library with the numbers of the interface pins
\nLiquidCrystal lcd(12, 11, 5, 4, 3, 2);
\n\/\/ — creating bargraph instance, format is (&lcd, lcdNumCols, start X, start Y). So (&lcd, 16, 0, 1) would set the bargraph length to 16 columns and start the bargraph at column 0 on row 1.
\nLcdBarGraph lbg0(&lcd, 20, 0, 1);
\nLcdBarGraph lbg1(&lcd, 20, 0, 3);<\/p>\n
\/\/ variables for input pin and control LED
\n\/\/variables for the power meter
\n\/\/ For the AD converters<\/p>\n
int analogInputTEMP1 = 0; \/\/input 1st LM35 sensor on pin A0
\nint analogInputTEMP2 = 1; \/\/input 2nd LM35 sensor on pin A1
\n\/\/For the alarms
\nint alarmtemp1 = 7; \/\/Temp1 alarm on pin 7
\nint alarmtemp2 = 1; \/\/Temp2 alarm on pin 1
\n\/\/float variables<\/p>\n
float TEMP1 = 0.0;
\nfloat TEMP2 = 0.0;
\n\/\/ variable to store the value
\nint counterTemp = EEPROM.read(0);
\nint counteroldTemp = counterTemp;
\nint counterMode = 0;
\nint counteroldMode = counterMode;
\n\/\/int updater = 0;
\nint incrementStateTemp = 0; \/\/will read increment for Power button
\nint lastIncrementStateTemp = 0;
\nint incrementStateMode = 0; \/\/will read increment for Mode button
\nint lastIncrementStateMode = 0;
\nbyte incrementButtonTemp = 8; \/\/ the pin that the pushbutton for the power selection is attached to
\nbyte incrementButtonMode = 13; \/\/ the pin that the pushbutton for the power selection is attached to
\nvoid setup() {<\/p>\n
\/\/ declaration of pin modes
\nanalogReference(EXTERNAL); \/\/sets reference to external connected reference 2,5V LT1009 reference<\/p>\n
\/\/ For the AD converters
\npinMode (analogInputTEMP1, INPUT); \/\/input from LM35
\npinMode (analogInputTEMP2, INPUT); \/\/input from LM35
\n\/\/For the pussh buttons
\npinMode(incrementButtonTemp, INPUT); \/\/ initialize the button pin for the Pwr switch as an input:
\npinMode(incrementButtonMode, INPUT); \/\/ initialize the button pin for the Mode switch as an input:<\/p>\n
\/\/for the leds outputs
\npinMode (alarmtemp1, OUTPUT); \/\/Temp warning on pin 7
\npinMode (alarmtemp2, OUTPUT); \/\/Temp alarm on pin 1<\/p>\n
\/\/setup alarms
\ndigitalWrite(alarmtemp1, LOW);
\ndigitalWrite(alarmtemp2, LOW);<\/p>\n
\/\/ set up the LCD’s number of columns and rows:
\nlcd.begin(20, 4);<\/p>\n
\/\/ A little bit of PR
\nlcd.setCursor(0, 0);
\nlcd.print(” TEMPERATURE METER”);
\nlcd.setCursor(7, 1);
\nlcd.print(“PA3CSG”);
\nlcd.setCursor(6, 2);
\nlcd.print(“Welcome”);
\nlcd.setCursor(5, 3);
\nlcd.print(“Have fun!”);
\ndelay(1500);
\nlcd.clear();<\/p>\n
\/\/print things on the lcd that donnot change anymore<\/p>\n
\/\/first line
\nlcd.setCursor(0, 0);
\nlcd.print(“AMP3=”);
\nlcd.setCursor(8, 0);
\nlcd.print((char)223);
\nlcd.print(“C”);
\nlcd.setCursor(12, 0);
\nlcd.print(“FS= “);
\n\/\/second line is bargraph<\/p>\n
\/\/third line<\/p>\n
lcd.setCursor(0, 2);
\nlcd.print(“AMP4=”);
\nlcd.setCursor (8, 2);
\nlcd.print((char)223);
\nlcd.print(“C”);
\nlcd.setCursor(12, 2);
\nlcd.print(“FS= “);<\/p>\n
\/\/fourth line is bargraph
\n}<\/p>\n
\/\/ main calculation routine starts here<\/p>\n
void loop() {
\nincrementStateTemp = digitalRead(incrementButtonTemp); \/\/read the increment button state
\nif (incrementStateTemp != lastIncrementStateTemp) \/\/compare increment button state to its last state
\n{
\nif (incrementStateTemp == LOW) \/\/increment button is pressed
\n{
\ncounterTemp = counterTemp + 1; \/\/increment the counter
\ndelay(10); \/\/debounce delay
\n}
\n}
\nlastIncrementStateTemp = incrementStateTemp;
\n\/\/Reading and counting the button for Mode<\/p>\n
incrementStateMode = digitalRead(incrementButtonMode); \/\/read the increment button state
\nif (incrementStateMode != lastIncrementStateMode) \/\/compare increment button state to its last state
\n{
\nif (incrementStateMode == LOW) \/\/increment button is pressed
\n{
\ncounterMode = counterMode + 1; \/\/increment the counter
\ndelay(10); \/\/debounce delay
\n}
\n}
\nlastIncrementStateMode = incrementStateMode;
\n\/\/limits the the counterTemp to 3 counts and resets to 0<\/p>\n
if (counterTemp > 2)
\n{
\ncounterTemp = 0;
\n}
\n\/\/limits the the counterMode to 1 counts and resets to 0<\/p>\n
if (counterMode >= 1)
\n{
\ncounterMode = 0;
\n}<\/p>\n
\/\/code to read and calculate TEMP1 from sensor<\/p>\n
TEMP1 = analogRead(analogInputTEMP1);<\/p>\n
TEMP1 = (TEMP1 \/ 4.096);
\ndelay (5);<\/p>\n
\/\/sets level for the alarmtemp.<\/p>\n
if (TEMP1 > 55) {<\/p>\n
digitalWrite (alarmtemp1, HIGH);
\nlcd.clear();
\nlcd.setCursor(4, 0);
\nlcd.print(“***ALARM***”);
\nlcd.setCursor(2, 2);
\nlcd.print(“*TEMPERATURE AMP1*”);
\nwhile (1) { } \/\/endless loop to stop
\n}
\n\/\/code to read and calculate TEMP2 from sensor<\/p>\n
TEMP2 = analogRead(analogInputTEMP2);<\/p>\n
TEMP2 = (TEMP2 \/ 4.096);
\ndelay (5);<\/p>\n
\/\/sets level for the alarmtemp.<\/p>\n
if (TEMP2 > 55) {<\/p>\n
digitalWrite (alarmtemp2, HIGH);
\nlcd.clear();
\nlcd.setCursor(4, 0);
\nlcd.print(“***ALARM***”);
\nlcd.setCursor(2, 2);
\nlcd.print(“*TEMPERATURE AMP2″);
\nwhile (1) { } \/\/endless loop to stop
\n}
\n\/\/ print calculated results to lcd display<\/p>\n
\/\/ first line of the display<\/p>\n
\/\/clears the space were the temp1 is printed
\nlcd.setCursor(6, 0);
\nlcd.print(” “);
\nlcd.setCursor(6, 0);
\nlcd.print (TEMP1 , 0);
\nlcd.setCursor (8, 0);
\nlcd.print((char)223);
\nlcd.print(“C”);<\/p>\n
\/\/second line of the display this is a bargraph
\n\/\/third line of the display<\/p>\n
\/\/clears the space were the temp2 is printed<\/p>\n
lcd.setCursor(6, 2);
\nlcd.print(” “);
\nlcd.setCursor(6, 2);
\nlcd.print (TEMP2 , 0);
\nlcd.setCursor (8, 2);
\nlcd.print((char)223);
\nlcd.print(“C”);<\/p>\n
\/\/fourth line of the display this is a bargraph
\n\/\/small routine to print the FS temperature of the bargraph on the first & third line of the display.<\/p>\n
if (counterTemp == 0 )
\n{
\nlcd.setCursor(15, 0);
\nlcd.print(” “);
\nlcd.setCursor(15, 0);
\nlcd.print(” 50″);
\nlcd.setCursor (18, 0);
\nlcd.print((char)223);
\nlcd.print(“C”);
\n}
\nif (counterTemp == 1 ) {
\nlcd.setCursor(15, 0);
\nlcd.print(” “);
\nlcd.setCursor(15, 0);
\nlcd.print(“100”);
\nlcd.setCursor (18, 0);
\nlcd.print((char)223);
\nlcd.print(“C”);
\n}
\nif (counterTemp == 2 ) {
\nlcd.setCursor(15, 0);
\nlcd.print(” “);
\nlcd.setCursor(15, 0);
\nlcd.print(“200”);
\nlcd.setCursor (18, 0);
\nlcd.print((char)223);
\nlcd.print(“C”);
\n}<\/p>\n
if (counterTemp == 0 )
\n{
\nlcd.setCursor(15, 2);
\nlcd.print(” “);
\nlcd.setCursor(15, 2);
\nlcd.print(” 50″);
\nlcd.setCursor (18, 2);
\nlcd.print((char)223);
\nlcd.print(“C”);
\n}
\nif (counterTemp == 1 ) {
\nlcd.setCursor(15, 2);
\nlcd.print(” “);
\nlcd.setCursor(15, 2);
\nlcd.print(“100”);
\nlcd.setCursor (18, 2);
\nlcd.print((char)223);
\nlcd.print(“C”);
\n}
\nif (counterTemp == 2 ) {
\nlcd.setCursor(15, 2);
\nlcd.print(” “);
\nlcd.setCursor(15, 2);
\nlcd.print(“200”);
\nlcd.setCursor (18, 2);
\nlcd.print((char)223);
\nlcd.print(“C”);
\n}
\n\/\/print bargraph on lines 1 & 3<\/p>\n
lcd.setCursor(0, 1);<\/p>\n
if (counterMode == 0) {
\nif (counterTemp == 0 ) {
\nlbg0.drawValue( TEMP1, 50); \/\/ — draw bar graph from the analog value readed
\ndelay(1);
\n}
\nif (counterTemp == 1 ) {
\nlbg0.drawValue( TEMP1, 100); \/\/ — draw bar graph from the analog value readed
\ndelay(1);
\n}<\/p>\n
if (counterTemp == 2 ) {
\nlbg0.drawValue( TEMP1, 200); \/\/ — draw bar graph from the analog value readed
\ndelay(1);
\n}
\nlcd.setCursor(0, 3);<\/p>\n
if (counterMode == 0) {
\nif (counterTemp == 0 ) {
\nlbg1.drawValue( TEMP2, 50); \/\/ — draw bar graph from the analog value readed
\ndelay(1);
\n}
\nif (counterTemp == 1 ) {
\nlbg1.drawValue( TEMP2, 100); \/\/ — draw bar graph from the analog value readed
\ndelay(1);
\n}<\/p>\n
if (counterTemp == 2 ) {
\nlbg1.drawValue( TEMP2, 200); \/\/ — draw bar graph from the analog value readed
\ndelay(1);
\n}<\/p>\n
\/\/saves the counterTemp value in the eeprom for the next time so that you don’t have to set the Temp every time.
\nif (counterTemp != counteroldTemp) {
\nEEPROM.write(0, counterTemp);
\n}
\n}<\/p>\n
\/\/ sleep…
\ndelay(20);<\/p>\n
}
\n}<\/p>\n","protected":false},"excerpt":{"rendered":"