Cons-n-Stuff/PCB-reflow-solder-heat-plate
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Added better pin debouncing, voltage references, python parsing, groundtruth measurements

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This commit is contained in:
Nathan 2022-04-21 20:38:09 -07:00
parent 29451ad11f
commit 8649afd315
6 changed files with 13981 additions and 43 deletions
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3
.gitignore vendored
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@ -24,3 +24,6 @@ fp-info-cache
# Exported BOM files
*.xml
*.csv
# ipynb checkpoints
.ipynb_checkpoints

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Firmware/analysis/data/thermal_analysis1.log Normal file
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Firmware/analysis/data/thermal_analysis2.log Normal file
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82
Firmware/pcb_reflow_fw/pcb_reflow_fw.ino
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@ -47,20 +47,20 @@ static const PROGMEM float sw = 2.0;
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1); // Create Display
// Pin Definitions
#define MOSFET_PIN PIN_PC3
#define UPSW_PIN PIN_PF3
#define DNSW_PIN PIN_PD4
#define TEMP_PIN PIN_PF2 // A2
#define VCC_PIN PIN_PF4 // A0
#define LED_GREEN_PIN PIN_PC4
#define LED_RED_PIN PIN_PC5
#define ONE_WIRE_BUS PIN_PE1
#define MOSFET_PIN PIN_PC3
#define UPSW_PIN PIN_PF3
#define DNSW_PIN PIN_PD4
#define TEMP_PIN PIN_PF2 // A2
#define VCC_PIN PIN_PF4 // A0
#define LED_GREEN_PIN PIN_PC4
#define LED_RED_PIN PIN_PC5
#define ONE_WIRE_BUS PIN_PE1
#define MOSFET_PIN_OFF 255
#define MOSFET_PIN_OFF 255
enum menu_state_t { MENU_IDLE, MENU_SELECT_PROFILE, MENU_HEAT, MENU_INC_TEMP, MENU_DEC_TEMP };
enum buttons_state_t { BUTTONS_NO_PRESS, BUTTONS_BOTH_PRESS, BUTTONS_UP_PRESS, BUTTONS_DN_PRESS };
enum single_button_state_t {BUTTON_PRESSED, BUTTON_RELEASED, BUTTON_NO_ACTION};
enum single_button_state_t { BUTTON_PRESSED, BUTTON_RELEASED, BUTTON_NO_ACTION };
// Button interrupt state
volatile single_button_state_t up_button_state = BUTTON_NO_ACTION;
@ -68,7 +68,6 @@ volatile single_button_state_t dn_button_state = BUTTON_NO_ACTION;
volatile unsigned long up_state_change_time = 0;
volatile unsigned long down_state_change_time = 0;
// Temperature Info
byte max_temp_array[] = {140, 150, 160, 170, 180};
byte max_temp_index = 0;
@ -197,7 +196,6 @@ void upsw_change_isr() {
up_state_change_time = millis();
}
void setup() {
// Pin Direction control
@ -207,13 +205,13 @@ void setup() {
pinMode(TEMP_PIN, INPUT);
pinMode(VCC_PIN, INPUT);
pinMode(LED_GREEN_PIN, OUTPUT);
digitalWrite(LED_GREEN_PIN, HIGH);
analogWrite(MOSFET_PIN, 255); // VERY IMPORTANT, DONT CHANGE!
analogWrite(MOSFET_PIN, 255); // VERY IMPORTANT, DONT CHANGE!
attachInterrupt(DNSW_PIN, dnsw_change_isr, FALLING);
attachInterrupt(UPSW_PIN, upsw_change_isr, FALLING);
Serial.begin(9600);
// Enable Fast PWM with no prescaler
@ -286,13 +284,9 @@ inline void setupSensors() {
}
}
inline void setFastPwm() {
analogWriteFrequency(64);
}
inline void setFastPwm() { analogWriteFrequency(64); }
inline void setVREF() {
analogReference(INTERNAL1V5);
}
inline void setVREF() { analogReference(INTERNAL1V5); }
inline bool isFirstBoot() {
uint8_t first_boot = EEPROM.read(FIRSTTIME_BOOT_ADDR);
@ -327,7 +321,7 @@ inline int getMaxTempIndex(void) { return EEPROM.read(TEMP_INDEX_ADDR) % sizeof(
void showLogo() {
unsigned long start_time = millis();
display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS);
while(start_time + 2000 > millis()) {
while (start_time + 2000 > millis()) {
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE);
@ -342,7 +336,7 @@ void showLogo() {
display.display();
buttons_state_t cur_button = getButtonsState();
// If we press both buttons during boot, we'll enter the setup process
if(cur_button == BUTTONS_BOTH_PRESS) {
if (cur_button == BUTTONS_BOTH_PRESS) {
doSetup();
return;
}
@ -463,29 +457,31 @@ buttons_state_t getButtonsState() {
button_dn_time = down_state_change_time;
button_up_time = up_state_change_time;
interrupts();
unsigned long cur_time = millis();
buttons_state_t state = BUTTONS_NO_PRESS;
if(button_dn == BUTTON_PRESSED && button_up == BUTTON_PRESSED && abs(button_dn_time - button_up_time) < BUTTON_PRESS_TIME) {
if(cur_time - button_dn_time > BUTTON_PRESS_TIME && cur_time - button_up_time > BUTTON_PRESS_TIME) {
if (button_dn == BUTTON_PRESSED && button_up == BUTTON_PRESSED &&
abs(button_dn_time - button_up_time) < BUTTON_PRESS_TIME) {
if (cur_time - button_dn_time > BUTTON_PRESS_TIME &&
cur_time - button_up_time > BUTTON_PRESS_TIME) {
state = BUTTONS_BOTH_PRESS;
noInterrupts();
dn_button_state = BUTTON_NO_ACTION;
up_button_state = BUTTON_NO_ACTION;
interrupts();
}
} else if(button_up == BUTTON_PRESSED && cur_time - button_up_time> BUTTON_PRESS_TIME) {
state = BUTTONS_UP_PRESS;
noInterrupts();
up_button_state = BUTTON_NO_ACTION;
interrupts();
} else if(button_dn == BUTTON_PRESSED && cur_time - button_dn_time> BUTTON_PRESS_TIME) {
state = BUTTONS_DN_PRESS;
noInterrupts();
dn_button_state = BUTTON_NO_ACTION;
interrupts();
}
} else if (button_up == BUTTON_PRESSED && cur_time - button_up_time > BUTTON_PRESS_TIME) {
state = BUTTONS_UP_PRESS;
noInterrupts();
up_button_state = BUTTON_NO_ACTION;
interrupts();
} else if (button_dn == BUTTON_PRESSED && cur_time - button_dn_time > BUTTON_PRESS_TIME) {
state = BUTTONS_DN_PRESS;
noInterrupts();
dn_button_state = BUTTON_NO_ACTION;
interrupts();
}
return state;
}
@ -621,8 +617,8 @@ bool heat(byte max_temp, int profile_index) {
}
// Measure Values
// TODO(HEIDT) getting the temperature from the digital sensors is by far the slowest part of this loop.
// figure out an approach that allows control faster than sensing
// TODO(HEIDT) getting the temperature from the digital sensors is by far the slowest part
// of this loop. figure out an approach that allows control faster than sensing
t = getTemp();
v = getVolts();
float max_possible_amperage = v / bed_resistance;
@ -835,14 +831,14 @@ float getTemp() {
for (byte i = 0; i < 100; i++) { // Poll TEMP_PIN reading 100 times
t = t + analogRead(TEMP_PIN);
}
t /= 100.0; // average
t *= 1.5/1024.0; // voltage
t /= 100.0; // average
t *= 1.5 / 1024.0; // voltage
// conversion to temp, consult datasheet:
// https://www.ti.com/document-viewer/LMT85/datasheet/detailed-description#snis1681040
// this is optimized for 25C to 150C
// TODO(HEIDT) this is linearized and innacurate, could probably use the nonlinear
// functions without much overhead.
t = (t - 1.365)/((.301 - 1.365)/(150.0-25.0)) + 20.0;
t = (t - 1.365) / ((.301 - 1.365) / (150.0 - 25.0)) + 20.0;
debugprint(t);
debugprint(" ");
@ -865,7 +861,7 @@ float getVolts() {
}
v /= 20;
float vin = (v / 1023.0)*1.5;
float vin = (v / 1023.0) * 1.5;
debugprint("voltage at term: ");
debugprintln(vin);
vin = (vin / 0.090981) + 0.3;

57
Firmware/temperature_groundtruth_fw/temperature_groundtruth_fw.ino Normal file
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@ -0,0 +1,57 @@
#include <Adafruit_MAX31865.h>
// Use software SPI: CS, DI, DO, CLK
Adafruit_MAX31865 thermo = Adafruit_MAX31865(3, 4, 5, 6);
// The value of the Rref resistor. Use 430.0 for PT100 and 4300.0 for PT1000
#define RREF 430.0
// The 'nominal' 0-degrees-C resistance of the sensor
// 100.0 for PT100, 1000.0 for PT1000
#define RNOMINAL 100.0
void setup() {
Serial.begin(115200);
Serial1.begin(9600);
thermo.begin(MAX31865_3WIRE); // set to 2WIRE or 4WIRE as necessary
}
void loop() {
uint8_t fault = thermo.readFault();
if (fault) {
Serial.print("Fault 0x"); Serial.println(fault, HEX);
if (fault & MAX31865_FAULT_HIGHTHRESH) {
Serial.println("RTD High Threshold");
}
if (fault & MAX31865_FAULT_LOWTHRESH) {
Serial.println("RTD Low Threshold");
}
if (fault & MAX31865_FAULT_REFINLOW) {
Serial.println("REFIN- > 0.85 x Bias");
}
if (fault & MAX31865_FAULT_REFINHIGH) {
Serial.println("REFIN- < 0.85 x Bias - FORCE- open");
}
if (fault & MAX31865_FAULT_RTDINLOW) {
Serial.println("RTDIN- < 0.85 x Bias - FORCE- open");
}
if (fault & MAX31865_FAULT_OVUV) {
Serial.println("Under/Over voltage");
}
thermo.clearFault();
}
String s;
if (Serial1.available()) {
s = Serial1.readStringUntil('\n');
Serial.println(s);
}
if (s.indexOf("Temps") >= 0) {
Serial.print("Groundtruth ");
Serial.println(thermo.temperature(RNOMINAL, RREF));
}
}