Finetuning ADC performance and bugfix for PID

src/MAX11270.py

@@ -464,11 +464,14 @@ class MAX11270:
   '''
     Read ADC value in differential mode
   '''          
-  def read_differential(self):
+  def read_differential(self, rate=0b1001, OSR=8):
     #Triggers conversion
-    self._conversionMode()
-    time.sleep(0.001)
-    adc_code = self.readDataRegister()
-    return self.value_to_voltage(adc_code)
-
+    voltage = 0
+    for i in range(OSR):
+      self._conversionMode(rate=rate)
+      time.sleep(0.01)
+      adc_code = self.readDataRegister()
+      voltage = voltage + self.value_to_voltage(adc_code)
+    
+    return(voltage/OSR)
 

src/PID.py

@@ -34,7 +34,7 @@ class PID:
         self.dev_num_adc = dev_num_adc
         self.channel_num_adc = channel_num_adc
         self.dev_num_dac = dev_num_dac
-        self.channel_dac = channel_num_dac
+        self.channel_num_dac = channel_num_dac
         self.pid_num = pid_num
 
         self.ITerm     = 0
@@ -187,10 +187,10 @@ def run(pid_obj, freq, num):
             pid_obj.setKd(msg[1])
             server.send_string('ACK')
         elif msg[0] == 'set_outmax':
-            pid_obj.setOutmax(msg[1])
+            pid_obj.setOutmax(float(msg[1]))
             server.send_string('ACK')
         elif msg[0] == 'set_outmin':
-            pid_obj.setOutmin(msg[1])
+            pid_obj.setOutmin(float(msg[1]))
             server.send_string('ACK')
         elif msg[0] == 'get_setpoint':
             #out_queue.put(pid_obj.getSetpoint() )

src/test_MAX11270.py

@@ -47,15 +47,22 @@ def adc2T(dU):
 myADC = MAX11270.MAX11270(21,20,19,17,27,22)
 myDAC = MCP4822.MCP4822(11, 10, 8, 5)
 
-#myDAC.write(0,1)
+myDAC.write(1.29,1)
 #myDAC.write(0,0)
 
 print('-Status-')
-print(myADC.readStatusRegister(1))
+print(bin(myADC.readStatusRegister(1)))
+print(bin(myADC.rate))
+
+myADC.setConversion('continous')
 #myADC.performCalibration('offsetCalibration')
 #print(myADC.readStatusRegister(1))
 
 print('--------Readout ADC value ---------')
 for i in range(0,100):
+    #print(myADC.read_differential())
     print(adc2T(myADC.read_differential()))
-    time.sleep(10)
+
+    myADC.readStatusRegister(1)
+    print(bin(myADC.rate))
+    time.sleep(1)

src/test_MCP4822.py

@@ -3,6 +3,6 @@ import time
 
 myDAC = MCP4822.MCP4822(11, 10, 8, 5)
 myDAC.write(1,0)
-myDAC.write(0,1)
+myDAC.write(1,1)
 
-#time.sleep(10)
+time.sleep(10)