Add first brew data

barista/barista.ino

@@ -22,7 +22,8 @@ enum machine_state {
 	DEBOUNCE,
 	HEATING,
 	HOT,
-	BREWING,
+	BREWING_HOT,
+	BREWING_COLD,
 	COOLING,
 	PANIC_OVERHEAT,
 };
@@ -186,7 +187,7 @@ void proc_buttons(struct state *state, const struct input *input)
 
 int red_min = 50;
 int red_state = red_min;
-unsigned long brewing_time     =  3000UL; /* 3 seconds */
+unsigned long brewing_max_time =  3000UL; /* 3 seconds */
 unsigned long cooling_time     =  3000UL; /* 3 seconds */
 unsigned long overheat_time    = 10000UL; /* 10 seconds */
 unsigned long max_heating_time = 60000UL; /* 60 seconds */
@@ -196,7 +197,7 @@ void proc_machine(struct state *st)
 {
 	float temp = st->ntc_T;
 	int on = (st->btn[BTN_ON].state == RELEASED);
-	int hot = (st->btn[BTN_HOT].state == PRESSED);
+	int brew_hot = (st->btn[BTN_HOT].state == PRESSED);
 
 	Serial.print("t=");
 	Serial.print(millis());
@@ -223,7 +224,12 @@ void proc_machine(struct state *st)
 	}
 
 	if (st->mstate == SLEEPING) {
-		if (on) {
+		/* Allow brewing cold at without turning the heater */
+		/* FIXME: Use the cold button instead */
+		if (brew_hot) {
+			st->mstate = BREWING_COLD;
+			Serial.println("brewing cold");
+		} else if (on) {
 			st->mstate = HEATING;
 			st->heating_t0 = millis();
 			Serial.println("heating");
@@ -240,20 +246,28 @@ void proc_machine(struct state *st)
 			Serial.println("cannot heat, going to sleep");
 		}
 	} else if (st->mstate == HOT) {
-		if (hot) {
+		if (brew_hot) {
-			st->mstate = BREWING;
+			st->mstate = BREWING_HOT;
 			st->brewing_t0 = millis();
 			Serial.println("brewing");
 		} else if (millis() - st->hot_t0 > max_idle_time) {
 			st->mstate = SLEEPING;
 			Serial.println("idle timeout, going to sleep");
 		}
-	} else if (st->mstate == BREWING) {
+	} else if (st->mstate == BREWING_HOT) {
-		if (millis() - st->brewing_t0 > brewing_time) {
+		/* Stop brewing if no longer pressing the brew button or we
+		 * exceed the brew max time */
+		if (!brew_hot || millis() - st->brewing_t0 > brewing_max_time) {
 			st->mstate = COOLING;
 			st->cooling_t0 = millis();
 			Serial.println("cooling");
 		}
+	} else if (st->mstate == BREWING_COLD) {
+		/* FIXME: Use cold button instead */
+		if (!brew_hot) {
+			st->mstate = SLEEPING;
+			Serial.println("going back to sleeping after cold brewing");
+		}
 	} else if (st->mstate == COOLING) {
 		/* TODO: Wait a bit and go back to heating */
 		if (millis() - st->cooling_t0 > cooling_time) {
@@ -316,7 +330,7 @@ output_leds(const struct state *st)
 	} else if (st->mstate == PANIC_OVERHEAT) {
 		setled(PIN_LED_RED, 1);
 		setled(PIN_LED_GREEN, 0);
-	} else if (st->mstate == BREWING) {
+	} else if (st->mstate == BREWING_HOT || st->mstate == BREWING_COLD) {
 		setled(PIN_LED_RED, 0);
 		analogWrite(PIN_LED_GREEN, g);
 		if (g >= 255)
@@ -333,7 +347,7 @@ output_leds(const struct state *st)
 void
 output_heater(const struct state *st)
 {
-	if (st->mstate == HEATING || st->mstate == HOT || st->mstate == BREWING) {
+	if (st->mstate == HEATING || st->mstate == HOT || st->mstate == BREWING_HOT) {
 		if (st->ntc_T < TEMP_MIN)
 			relay(PIN_HEAT, ON);
 		else if (st->ntc_T > TEMP_MAX)
@@ -346,7 +360,7 @@ output_heater(const struct state *st)
 void
 output_pump(const struct state *st)
 {
-	if (st->mstate == BREWING)
+	if (st->mstate == BREWING_HOT || st->mstate == BREWING_COLD)
 		relay(PIN_PUMP, ON);
 	else
 		relay(PIN_PUMP, OFF);
@@ -356,6 +370,7 @@ void do_output(const struct state *st)
 {
 	output_leds(st);
 	output_heater(st);
+	output_pump(st);
 }
 
 void setup()