diff --git a/ardas/uncalibrated_sensors_generator.py b/ardas/uncalibrated_sensors_generator.py
index 0e650cf..cfaafea 100644
--- a/ardas/uncalibrated_sensors_generator.py
+++ b/ardas/uncalibrated_sensors_generator.py
@@ -1,6 +1,6 @@
 from ardas import sensor_tools as st
 # Saves a set of sensors including its calibration in a binary '.ssr' file
-sensors = (st.FMSensor(sensor_id='0001', log_output=True),
+sensors = (st.UncalibratedFMSensor(sensor_id='0001', log_output=True),
            st.UncalibratedFMSensor(sensor_id='0002', log_output=True),
            st.UncalibratedFMSensor(sensor_id='0003', log_output=True),
            st.UncalibratedFMSensor(sensor_id='0004', log_output=True),
diff --git a/arduino_sketch/ardas.ino b/arduino_sketch/ardas.ino
index 8f1f0f7..0f1cb45 100644
--- a/arduino_sketch/ardas.ino
+++ b/arduino_sketch/ardas.ino
@@ -24,7 +24,7 @@
 #include <avr/pgmspace.h>
 
 #define PULSE_WIDTH_USEC 5
-#define READ_COUNTER_REGISTER_FREQ 2 // CHECK : should be 1 if SQW freq is 1 Hz
+#define READ_COUNTER_REGISTER_FREQ 4 // CHECK : should be 1 if SQW freq is 1 Hz
 #define CLOCK_FREQ 4096
 #define VERSION "Version ArDAS 1.0.1 [UMONS-GFA - 2016]"
 #define EOL '\r'