Jon Z / Mbed 2 deprecated espresso-machine-control

Controls both heat and pump pressure based on a temperature probe and a scale- ie, it does temperature and flow profiling. Should work with any vibratory pump machine.

Dependencies:   Adafruit_RTCLib FastPWM TSI mbed

Files at this revision

API Documentation at this revision

Revision 6:56b205b46b42, committed 2014-07-05

Comitter:
jzeeff
Date:
Sat Jul 05 20:52:06 2014 +0000
Parent:
5:0393adfdd439
Commit message:
Stable version

Changed in this revision

main.cpp Show annotated file Show diff for this revision Revisions of this file 
--- a/main.cpp	Mon Apr 14 20:35:30 2014 +0000
+++ b/main.cpp	Sat Jul 05 20:52:06 2014 +0000
@@ -72,7 +72,7 @@
 
 // these probably don't need to be changed if you are using a Gaggia Classic
 #define AD_PER_DEGREE 43        // how many A/D counts equal a 1 degree C change 
-#define AD_PER_GRAM 76.70       // how many A/D count equal 1 gram of weight
+#define AD_PER_GRAM 56.0       // how many A/D count equal 1 gram of weight
 #define CLOSE 60                // how close in A/D value before switching to learned value control
 #define GAIN .01                // how fast to adjust heat(eg 1% percent per 2.7s control period) 
 #define INITIAL_POWER  .03      // initial guess for steady state heater power needed (try .03 = 3%)
@@ -81,8 +81,8 @@
 #define STEAM_TEMP 28000        // boiler temp while steaming
 #define ROOM_TEMP 21707         // A/D value at standard ambient room temp 23C
 #define MAX_ROOM_TEMP (ROOM_TEMP + (10 * AD_PER_DEGREE))     // above this means ambient isn't valid
-#define SLEEP_PERIOD (4*3600)   // turn off heat after this many seconds
-#define WAKEUP_TIME 12          // time in 0-23 hours, GMT to wake up. 99 to disable.  Example: 12 for noon GMT
+#define SLEEP_PERIOD (6*3600)   // turn off heat after this many seconds
+#define WAKEUP_TIME 11          // time in 0-23 hours, GMT to wake up. 99 to disable.  Example: 12 for noon GMT
 
 #define TARGET_TEMP ((TARGET_OHMS*65536)/(TARGET_OHMS+2200))   // how hot the boiler should be in A/D
 #define debug if (1) printf     // use if (1) or if (0)
@@ -144,14 +144,16 @@
 
     led_color(OFF);
 
-    wait(1);                      // let settle
+    wait(1);                            // let settle
     ambient_temp = read_temp(BOILER);   // save temp on startup
 
-#if 0
-    DateTime compiled(__DATE__, __TIME__);  // to set RT clock initially
-    rtclock.adjust(compiled);
-#endif
-    DateTime dt = rtclock.now();                     // check clock value
+   DateTime dt = rtclock.now();                     // check clock value
+   if (dt.year() > 2090 || dt.year() < 2014) {
+        DateTime compiled(__DATE__, __TIME__);      // to set RT clock initially
+        rtclock.adjust(compiled);
+        DateTime dt = rtclock.now();                // check again
+    }
+
     debug("RTC = %u/%u/%02u %2u:%02u:%02u\r\n"
           ,dt.month(),dt.day(),dt.year()
           ,dt.hour(),dt.minute(),dt.second());
@@ -159,10 +161,10 @@
 
     debug("starting A/D value/temp = %u %u\r\n",ambient_temp,read_temp(GROUP));
 
-    pump = 0;               // duty cycle.
+    pump = 0;               // initial duty cycle (pump off)
     pump.period_us(410);    // period of PWM signal in us
 
-    if (ambient_temp < MAX_ROOM_TEMP)
+    if (ambient_temp < MAX_ROOM_TEMP)   // check for cold boiler
         steam(7 * 60);      // do accelerated warmup by overheating for awhile
 
     // loop forever, controlling boiler temperature