reflow/reflowctl/reflowctl.ino

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Arduino
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#define START_STATE 0
#define PREHEAT_STATE 1
#define RAMP_UP_STATE 2
#define TAL_FIRST_STATE 3
#define PEAK_STATE 4
#define TAL_SECOND_STATE 5
#define RAMPDOWN_STATE 6
#define END_STATE 7
#define ERROR_STATE 8
// error conditions
#define E_RAMPUP 1 // oven heats up too fast
#define E_RAMPDOWN_TOO_FAST 2 // oven cools down too fast
#define E_RAMPDOWN_TOO_SLOW 3 // oven cools down too slow
#define E_TIME_MAX 4 // reflow process does take too long
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unsigned int time = 0; // profile seconds
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unsigned int temperatur = 25; // actual oven temp
unsigned int last_temperatur = 25;
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unsigned int Ts_max = 200; // °C
unsigned int Ts_min = 150; // °C
unsigned int Tp = 260; // 245-260°C
unsigned int rampup_rate = 3; // 3°C/s
unsigned int preheat_duration = 100; // 60-180s
unsigned int tal = 217; // 217°C
unsigned int tal_duration = 100; // 60-150s
unsigned int peak_duration = 30; // 20-40s
unsigned int rampdown_max = 6; // 6°C/s max
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unsigned int rampdown_min = 2; // 2°C/s max
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unsigned int time_max = 480; // 8*60s max
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unsigned int Ts_min_time = 0;
unsigned int Ts_max_time = 0;
unsigned int Tl_time = 0;
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unsigned int Tl_time_end = 0;
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unsigned int Tp_time = 0;
unsigned int Tl_end_time = 0;
unsigned int error_condition = 0;
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byte state = START_STATE;
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void setup() {
pinMode(13, OUTPUT);
Serial.begin(9600);
}
void get_temp() {
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// simulating an +1K/s rampup oven
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last_temperatur = temperatur++;
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}
boolean check_rampup_rate() {
if (temperatur - last_temperatur > rampup_rate) {
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error_condition = E_RAMPUP;
return false;
}
return true;
}
boolean check_rampdown_rate() {
unsigned int dt = temperatur - last_temperatur;
if (dt > rampdown_max) {
error_condition = E_RAMPDOWN_TOO_FAST;
return false;
}
if (dt < rampdown_min) {
error_condition = E_RAMPDOWN_TOO_SLOW;
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return false;
}
return true;
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}
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boolean time_max_check() {
if (time > time_max) {
error_condition = E_TIME_MAX;
return false;
}
}
boolean check_tal_duration() {
if (time > time_max) {
error_condition = E_TIME_MAX;
return false;
}
}
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void loop() {
time = millis() / 1000;
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get_temp();
Serial.print(time);
Serial.print(" ");
Serial.print(temperatur);
Serial.print(" ");
Serial.println(last_temperatur);
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switch (state) {
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case START_STATE:
// going from room temp to preheat, nothing to check here
if (!check_rampup_rate())
goto error;
if (temperatur > Ts_min) {
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Serial.println("Changed state to PREHEAT_STATE");
Ts_min_time = time;
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state++;
}
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case PREHEAT_STATE:
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if (temperatur > Ts_max) {
Serial.println("Changed state to PREHEAT_STATE");
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Ts_max_time = time;
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state++;
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}
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break;
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case TAL_FIRST_STATE:
break;
case PEAK_STATE:
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break;
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case TAL_SECOND_STATE:
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break;
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case RAMPDOWN_STATE:
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break;
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case END_STATE:
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default:
break;
}
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delay(1000);
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return;
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error:
state = END_STATE;
Serial.println(error_condition);
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}