Modificatino during test esp. voltage sensor

I2C_serial_pi.py

@@ -55,7 +55,7 @@ class I2C:
         return ret_ack, ret_value
 
     
-    def read_last_reg(self, bytes_to_read):
+    def read_last_reg(self, bytes_to_read, print_on = DEBUG):
         bus = smbus.SMBus(self.bus_nr)
         rd_value = []
         ret_value = ''
@@ -68,12 +68,12 @@ class I2C:
             except IOError:
                 ret_ack = 0
                 rd_value.append(0)
-                if DEBUG:
-                    print("Reading error")
+                if print_on:
+                    print(f"Reading IOerror {rd_value}")
             except err:
                 ret_ack = 0
                 rd_value.append(0)
-                if DEBUG:
+                if print_on:
                     print("Reading error")
         for cnt in range(bytes_to_read):
             ret_value += (hex(rd_value[cnt])[2:])

apsct_lib.py

@@ -406,6 +406,8 @@ class ApsctSensors:
         if not (15 < self.temperature < 50):
             result = False
             print(f"Error temperature read {self.temperature:4.2f} °C")
+        else:
+            print(f"OK    temperature read {self.temperature:4.2f} °C")
         return result
 
     def read_voltage(self, input_channel=0):
@@ -422,9 +424,8 @@ class ApsctSensors:
         if DEBUG:
             stri = "Word to select sens input is 0x{0:x}".format(channel_select_word)
             print(stri)
-        sleep(0.2)
         self.dev_i2c_sensor.write_bytes(channel_select_word, 0xB8)
-        sleep(0.2)
+        sleep(0.3) # Wait for device to take snapshot
         ret_ack, ret_value = self.dev_i2c_sensor.read_last_reg(3)
         if DEBUG:
             stri = "Return value input 0 : 0x{0} ".format(ret_value)
@@ -434,10 +435,11 @@ class ApsctSensors:
         else:
             steps = (int(ret_value, 16) & 0x1FFFFF) >> 6
             voltage = one_step * steps
-            voltage = ((4.7+2.2)/2.2)*2*voltage
+            voltage = ((4.7+2.2)/2.2)*2*voltage # Resistor network + half swing
             if DEBUG:
                 string = "Voltage sens line {1} is {0:.4f} V".format(voltage, input_channel)
                 print(string)
+        sleep(0.2) # wait for device to go to sleep 
         return voltage
 
     def read_temp(self):
@@ -448,9 +450,12 @@ class ApsctSensors:
         #
         Vref = 3.0
         temp_slope = 93.5E-6 * 2**(16+1) / Vref
-        sleep(1.0)
-        self.dev_i2c_sensor.write_bytes(0xA0, 0xC0)
-        sleep(1.0)
+        ret_ack = self.dev_i2c_sensor.write_bytes(0xA0, 0xC0)
+        sleep(0.5)
+        self.temperature = 9999
+        loops = 0
+        while (self.temperature > 100 ) & (loops < 2):
+            loops = loops + 1
             ret_ack, ret_value = self.dev_i2c_sensor.read_last_reg(3)
             if ret_ack:
                 raw_value = (int(ret_value, 16) & 0x1FFFFF) >> 6
@@ -458,6 +463,7 @@ class ApsctSensors:
                 self.temperature = temperature_K-273
             else:
                 self.temperature = 9999
+        sleep(0.2)
         return self.temperature
 
 class PpsClass: