luca
/
soldering-iron
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Regulate heating proportionally

This commit is contained in:
Luca 2023-08-05 00:41:57 +02:00
parent 39d65c38e2
commit 95e253efed
1 changed files with 80 additions and 47 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

127
src/main.rs
View File

@ -53,10 +53,15 @@ const HYSTERESIS: u16 = 10;
const PEAK_TEMPERATURE: u16 = 240;
const POWER_FACTOR: u16 = 10;
const POWER_MAX: u16 = 1000;
const PREHEAT_TEMPERATURE: u16 = 150;
const SOAK_TIME: MicrosDurationU64 = MicrosDurationU64::secs(90);
const TEMPERATURE_BUFF: u16 = 10;
enum State<'a> {
Off,
Preheat,
@ -65,6 +70,14 @@ enum State<'a> {
Cooling,
}
fn clamp(value: u16, max: u16) -> u16 {
if value > max {
max
} else {
value
}
}
fn print_serial<'a, B: UsbBusTrait>(
serial: &mut SerialPort<'a, B>,
msg: &str,
@ -231,11 +244,12 @@ fn main() -> ! {
button_cooldown.start(0.secs());
let mut counter = 0;
let mut current_temperature = Option::<u16>::None;
let mut state = State::Off;
let mut heating = false;
let mut power = 0;
loop {
delay.delay_ms(5);
counter = (counter + 1) % 100;
counter = (counter + 1) % 2000;
if let Ok(_) = button_cooldown.wait() {
let button_pressed = button.is_low().unwrap();
@ -254,14 +268,58 @@ fn main() -> ! {
button_held = button_pressed;
}
if counter == 0 {
led.toggle().unwrap();
if counter % 50 == 0 {
let thermocouple_result = thermocouple.read_temperature(&mut timer.count_down());
if let Some(mut temperature) = thermocouple_result.as_ref().copied().ok() {
temperature = (temperature >> 2) + ((temperature & 2) >> 1);
match state {
State::Off => (),
State::Preheat => {
if temperature < PREHEAT_TEMPERATURE {
heating = true;
power = clamp((PREHEAT_TEMPERATURE - temperature + TEMPERATURE_BUFF) * POWER_FACTOR, POWER_MAX);
} else {
let mut time = timer.count_down();
time.start(SOAK_TIME);
state = State::Soak(time);
}
}
State::Soak(ref mut time) => match time.wait() {
Ok(_) => state = State::Reflow,
Err(WouldBlock) => {
if temperature < PREHEAT_TEMPERATURE - HYSTERESIS {
heating = true;
power = clamp((PREHEAT_TEMPERATURE - temperature + TEMPERATURE_BUFF) * POWER_FACTOR, POWER_MAX);
} else if temperature > PREHEAT_TEMPERATURE + HYSTERESIS * 2 {
state = State::Reflow;
} else if temperature > PREHEAT_TEMPERATURE {
heating = false;
}
}
Err(_) => state = State::Off,
},
State::Reflow => {
if temperature < PEAK_TEMPERATURE {
heating = true;
power = clamp((PEAK_TEMPERATURE - temperature + TEMPERATURE_BUFF) * POWER_FACTOR, POWER_MAX);
} else {
heating = false;
state = State::Cooling;
}
}
State::Cooling => state = State::Off,
}
} else {
state = State::Off;
}
let mut bytes: [u8; 7] = [32, 32, 32, 32, 194, 176, 67];
let text = match thermocouple.read_temperature(&mut timer.count_down()) {
let text = match thermocouple_result {
Ok(mut temperature) => {
temperature >>= 2;
current_temperature = Some(temperature);
temperature = (temperature >> 2) + ((temperature & 2) >> 1);
for i in (0..3).rev() {
bytes[i] = 48u8 + (temperature % 10) as u8;
@ -303,48 +361,23 @@ fn main() -> ! {
}
}
if let Some(temperature) = current_temperature {
match state {
State::Off => (),
State::Preheat => {
if temperature < PREHEAT_TEMPERATURE {
relay.set_high().unwrap();
} else {
let mut time = timer.count_down();
time.start(SOAK_TIME);
state = State::Soak(time);
}
}
State::Soak(ref mut time) => match time.wait() {
Ok(_) => state = State::Reflow,
Err(WouldBlock) => {
if temperature < PREHEAT_TEMPERATURE - HYSTERESIS {
relay.set_high().unwrap();
} else if temperature > PREHEAT_TEMPERATURE + HYSTERESIS * 2 {
state = State::Reflow;
} else if temperature > PREHEAT_TEMPERATURE {
relay.set_low().unwrap();
}
}
Err(_) => state = State::Off,
},
State::Reflow => {
if temperature < PEAK_TEMPERATURE {
relay.set_high().unwrap();
} else {
relay.set_low().unwrap();
state = State::Cooling;
}
}
State::Cooling => state = State::Off,
}
} else {
state = State::Off;
}
if let State::Off = state {
relay.set_low().unwrap();
heating = false;
}
if heating {
if counter == 0 {
relay.set_high().unwrap();
} else if counter >= power {
relay.set_low().unwrap();
}
} else {
relay.set_low().unwrap();
}
if counter % 100 == 0 {
led.toggle().unwrap();
}
if !usb_dev.poll(&mut [&mut serial]) {