aboutsummaryrefslogtreecommitdiff
path: root/csource/IR_PID/IR_PID.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'csource/IR_PID/IR_PID.cpp')
-rw-r--r--csource/IR_PID/IR_PID.cpp180
1 files changed, 58 insertions, 122 deletions
diff --git a/csource/IR_PID/IR_PID.cpp b/csource/IR_PID/IR_PID.cpp
index bfe7dff..1ec54c7 100644
--- a/csource/IR_PID/IR_PID.cpp
+++ b/csource/IR_PID/IR_PID.cpp
@@ -1,6 +1,10 @@
//------------------------------------------------------------------------
// Single file IR_PID
//
+// Minor cleanup by Donald Delmar Davis, don@suspectdevice.som
+//
+// Added safety. If temp sensor times out turn off the burner.
+//
// IR_PID - Main File
// PID Controller for a Hot Plate for Surface Mount Soldering.
// Scott Dixon & Jim Larson
@@ -49,12 +53,15 @@
#include <avr/EEPROM.h>
+#include <avr/pgmspace.h>
+#include <stdio.h>
#include "WProgram.h"
void setup();
void setTargetTemp(float t);
float getTargetTemp();
void loop();
+int to2d(float f);
float readFloat(int address);
void writeFloat(float value, int address);
void setupPID(unsigned int padd, int iadd, int dadd);
@@ -76,7 +83,6 @@ void printHelp();
void updateSerialInterface();
void printStatus();
void printStatusForGraph();
-void printFloat(float value, int places);
void setupTempSensor();
void updateTempSensor();
void readBit();
@@ -148,6 +154,15 @@ void setupPID(unsigned int padd, int iadd, int dadd) {
pgain = readFloat(pgainAddress);
igain = readFloat(igainAddress);
dgain = readFloat(dgainAddress);
+ unsigned char *checkBytes = (unsigned char *)((void *)&pgain);
+ if (checkBytes[0]==0xff && checkBytes[1]==0xff && checkBytes[2]==0xff && checkBytes[3]==0xff) {
+ // uninitialized eeprom set reasonable defaults
+ setP(30.0); // make sure to keep the decimal point on these values
+ setI(0.0); // make sure to keep the decimal point on these values
+ setD(0.0); // make sure to keep the decimal point on these values
+ setTargetTemp(0.0); // target temp should be something safe.
+ }
+
}
float getP() {
@@ -231,17 +246,11 @@ float updatePID(float targetTemp, float curTemp)
void printPIDDebugString() {
// A helper function to keep track of the PID algorithm
- Serial.print("PID formula (P + I - D): ");
-
- printFloat(pTerm, 2);
- Serial.print(" + ");
- printFloat(iTerm, 2);
- Serial.print(" - ");
- printFloat(dTerm, 2);
- Serial.print(" POWER: ");
- printFloat(getHeatCycles(), 0);
- Serial.print(" ");
-
+ char buffer[80];
+ snprintf(buffer,80,"PID formula (P + I - D): %d.%02d + %d.%02d - %d.%02d POWER: %d ",
+ int(pTerm),to2d(pTerm),int(iTerm),to2d(iTerm),int(dTerm),to2d(pTerm),
+ int(getHeatCycles()));
+ Serial.write(buffer);
}
//-----------------------------------------------------------------HeaterControl
@@ -329,7 +338,6 @@ int myBaud = 9600;
#define AUTO_PRINT_INTERVAL 200 // milliseconds
#define MAX_DELTA 100
#define MIN_DELTA 0.01
-#define PRINT_PLACES_AFTER_DECIMAL 2 // set to match MIN_DELTA
int incomingByte = 0;
@@ -337,14 +345,13 @@ float delta = 1.0;
boolean autoupdate;
boolean printmode = 0;
+
unsigned long lastUpdateTime = 0;
void setupSerialInterface() {
Serial.begin(myBaud);
- Serial.println("\nWelcome to the HPSS, the Hot Plate Solder System for Arduino");
- Serial.println("\nBased on the BBCC, the Bare Bones Coffee Controller for Arduino");
- Serial.println("Send back one or more characters to setup the controller.");
- Serial.println("If this is your initial run, please enter 'R' to Reset the EEPROM.");
- Serial.println("Enter '?' for help. Here's to a great cup!");
+ Serial.write("\r\nWelcome to the HPSS, the Hot Plate Solder System for Arduino\r\n");
+ Serial.write("Send back one or more characters to setup the controller.\r\n");
+ Serial.write("Enter '?' for help. Surface Mount or DIE!\r\n");
}
void printHelp() {
@@ -450,105 +457,42 @@ void updateSerialInterface() {
}
}
-void printStatus() {
- // A means for getting feedback on the current system status and controllable parameters
- Serial.print(" SET TEMP:");
- printFloat(getTargetTemp(),PRINT_PLACES_AFTER_DECIMAL);
- Serial.print(", CUR TEMP:");
- printFloat(getLastTemp(),PRINT_PLACES_AFTER_DECIMAL);
-
- Serial.print(", GAINS p:");
- printFloat(getP(),PRINT_PLACES_AFTER_DECIMAL);
- Serial.print(" i:");
- printFloat(getI(),PRINT_PLACES_AFTER_DECIMAL);
- Serial.print(" d:");
- printFloat(getD(),PRINT_PLACES_AFTER_DECIMAL);
- Serial.print(", Delta: ");
- printFloat(delta,PRINT_PLACES_AFTER_DECIMAL);
- Serial.print(", Power: ");
- printFloat((float)getHeatCycles(), 0);
-
- Serial.print("\r\n");
+int to2d(float f) {
+ return abs((int)((float)(f-((float)(int)f)) * 100.00));
}
+void printStatus() {
+ float tt,lt,p,i,d,hc;
+ tt=getTargetTemp();
+ lt=getLastTemp();
+ p=getP();
+ i=getI();
+ d=getD();
+ hc=getHeatCycles();
+ char printbuffer[100];
+ snprintf(printbuffer,100, "SET TEMP: %d.%02d, CUR TEMP: %d.%02d, GAINS p: %d.%02d" \
+ " i: %d.%02d d: %d.%02d, Delta: %d.%02d, Power: %d \r\n",
+ int(tt),to2d(tt),int(lt),to2d(lt),int(p),to2d(p),int(i),to2d(i),int(d),to2d(d),
+ int(delta),to2d(delta),int(hc));
+ Serial.write((const char *)printbuffer);
+ }
+
void printStatusForGraph() {
- printFloat(getTargetTemp(),PRINT_PLACES_AFTER_DECIMAL);
- Serial.print(", ");
- printFloat(getLastTemp(),PRINT_PLACES_AFTER_DECIMAL);
- Serial.print(", ");
- printFloat(getP(),PRINT_PLACES_AFTER_DECIMAL);
- Serial.print(", ");
- printFloat(getI(),PRINT_PLACES_AFTER_DECIMAL);
- Serial.print(", ");
- printFloat(getD(),PRINT_PLACES_AFTER_DECIMAL);
- Serial.print(", ");
- printFloat((float)getHeatCycles(), 0);
- Serial.println();
+ float tt,lt,p,i,d,hc;
+ tt=getTargetTemp();
+ lt=getLastTemp();
+ p=getP();
+ i=getI();
+ d=getD();
+ hc=getHeatCycles();
+ char printbuffer[100];
+ snprintf(printbuffer,100, "%d.%02d, %d.%02d, %d.%02d, %d.%02d, %d.%02d, %d.%02d,%d \r\n",
+ int(tt),to2d(tt),int(lt),to2d(lt),int(p),to2d(p),int(i),to2d(i),int(d),to2d(d),
+ int(delta),to2d(delta),int(hc));
+ Serial.write((const char *)printbuffer);
}
-// printFloat prints out the float 'value' rounded to 'places' places after the decimal point
-void printFloat(float value, int places) {
- // this is used to cast digits
- int digit;
- float tens = 0.1;
- int tenscount = 0;
- int i;
- float tempfloat = value;
-
- // make sure we round properly. this could use pow from <math.h>, but doesn't seem worth the import
- // if this rounding step isn't here, the value 54.321 prints as 54.3209
-
- // calculate rounding term d: 0.5/pow(10,places)
- float d = 0.5;
- if (value < 0)
- d *= -1.0;
- // divide by ten for each decimal place
- for (i = 0; i < places; i++)
- d/= 10.0;
- // this small addition, combined with truncation will round our values properly
- tempfloat += d;
-
- // first get value tens to be the large power of ten less than value
- // tenscount isn't necessary but it would be useful if you wanted to know after this how many chars the number will take
-
- if (value < 0)
- tempfloat *= -1.0;
- while ((tens * 10.0) <= tempfloat) {
- tens *= 10.0;
- tenscount += 1;
- }
-
-
- // write out the negative if needed
- if (value < 0)
- Serial.print('-');
-
- if (tenscount == 0)
- Serial.print(0, DEC);
-
- for (i=0; i< tenscount; i++) {
- digit = (int) (tempfloat/tens);
- Serial.print(digit, DEC);
- tempfloat = tempfloat - ((float)digit * tens);
- tens /= 10.0;
- }
-
- // if no places after decimal, stop now and return
- if (places <= 0)
- return;
-
- // otherwise, write the point and continue on
- Serial.print('.');
-
- // now write out each decimal place by shifting digits one by one into the ones place and writing the truncated value
- for (i = 0; i < places; i++) {
- tempfloat *= 10.0;
- digit = (int) tempfloat;
- Serial.print(digit,DEC);
- // once written, subtract off that digit
- tempfloat = tempfloat - (float) digit;
- }
-}
+
// temp - routines to read temperature strings from an IR
// Temperature Sensor.
@@ -577,7 +521,8 @@ volatile int message_waiting = 0;
unsigned long last_time = 0;
unsigned int consectutive_timeouts = 0;
-
+// -127 is what the ds 1 wires return for an error. if not read
+// this is what is returned.
float temp= -127.0;
float ambient;
@@ -588,10 +533,7 @@ int readCount = 0;
float multiplier;
void setupTempSensor() {
pinMode(IR_CLK, INPUT);
-// digitalWrite(IR_CLK,HIGH);
pinMode(IR_DATA, INPUT);
-// digitalWrite(IR_DATA,HIGH);
- //attachInterrupt(1, readBit, FALLING);
attachInterrupt(IR_INT, readBit, FALLING);
}
@@ -707,12 +649,6 @@ void loop()
heatPower = updatePID(targetTemp, getFreshTemp());
setHeatPowerPercentage(heatPower);
}
- /* safety */
- //if (getFreshTemp() == -127.00) {
- // setHeatPowerPercentage(0);
- //bark real loud!!!!
- // Serial.println("DBG: Sensor returned error");
- //}
if (consectutive_timeouts>20){
setHeatPowerPercentage(0);
//bark real loud!!!!
generated by cgit v1.2.3 (git 2.39.1) at 2026-08-07 10:22:59 +0000