Initial commit

diff --git a/heatpump.py b/heatpump.py
new file mode 100644 (file)
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+++ b/heatpump.py
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+import piplates.DAQCplate as DAQC
+import time
+from decimal import Decimal
+DAQC.setDOUTbit(0,0) 
+#thermistor reading function
+def compressor(state=None):
+    if state==None:
+        return DAQC.getDOUTbyte(0)
+    if state==True:
+        DAQC.setDOUTbit(0,0) 
+    if state==False:
+        DAQC.clrDOUTbit(0,0) 
+
+def temp_get(volts,supply_voltage=5):
+    divider_resistor=10000
+    ohms = Decimal(divider_resistor*supply_voltage/volts-divider_resistor) #calculate the ohms of the thermisttor
+    #IVT oem NTC
+    a = Decimal(1.298022762e-3)
+    b = Decimal(2.365068126e-4)
+    c = Decimal(0.9305914923e-7)
+    #Steinhart Hart Equation
+    # T = 1/(a + b[ln(ohm)] + c[ln(ohm)]^3)
+    temp = 1/(a + b*ohms.ln() + c*ohms.ln()**3) 
+    tempc = temp - Decimal(273.15) #K to C
+    return tempc
+
+while(True):
+    vv_retur=temp_get(DAQC.getADC(0,0),DAQC.getADC(0,8))
+    hetgas=temp_get(DAQC.getADC(0,1),DAQC.getADC(0,8))
+    print("VV retur:",vv_retur)
+    print("Hetgas:",hetgas)
+    print("Kompressor:",compressor())
+    if vv_retur < 35:
+        compressor(True)
+        print("Returtemp under 35. Startar kompressor")
+    if vv_retur > 45:
+        compressor(False)
+        print("Returtemp över 45. Stänger av kompressor")
+#    import pdb;pdb.set_trace()
+    time.sleep(1)
+