Add last_rho and last_std properties

dev/test_2_mux_2024.py

@@ -48,6 +48,7 @@ if within_ohmpi:
     k._hw.switch_mux([1, 4, 2, 3], state='on')
     k._hw.vab_square_wave(12,1)
     k._hw.switch_mux([1, 4, 2, 3], state='off')
+    print(f'Resistance: {k._hw.last_rho :.2f}, dev. {k._hw.last_dev:.2f} %')
     k._hw._plot_readings()
     plot_exec_log('ohmpi/logs/exec.log')
 change_config('../configs/config_default.py', verbose=False)
\ No newline at end of file

ohmpi/hardware_system.py

@@ -172,7 +172,8 @@ class OhmPiHardware:
             sampling_rate = self.rx.sampling_rate
         sample = 0
         self.exec_logger.info(f'values when starting pulse {self._pulse} : {self.tx.current} mA, {self.rx.voltage} mV')
-        self.rx.voltage
+        _ = self.rx.voltage
+        lap = datetime.datetime.utcnow()  # just in case tx_sync is not set immediately after passing wait
         self.tx_sync.wait()  #
         if not append or self._start_time is None:
             self._start_time = datetime.datetime.utcnow()
@@ -196,12 +197,14 @@ class OhmPiHardware:
         self._pulse += 1
         self.exec_logger.event(f'OhmPiHardware\tread_values\tend\t{datetime.datetime.utcnow()}')
 
+    @property
     def last_rho(self):
         if len(self.readings) > 1:
             return np.mean(self.readings[:, 2] * self.readings[:, 4] / self.readings[:, 3])
         else:
             return np.nan
 
+    @property
     def last_dev(self):
         if len(self.readings) > 1:
             return 100. * np.std(self.readings[:, 2] * self.readings[:, 4] / self.readings[:, 3])/self.last_rho()