tests: Address Copilot review on PR #116.

Author: nedseb

tests/scenarios/board_temperature_comparison.yaml

@@ -100,7 +100,7 @@ tests:
     expect_true: true
     mode: [hardware]
 
-  - name: "Calibrate all sensors to WSEN-HIDS reference"
+  - name: "Offset-align all sensors to WSEN-HIDS reference"
     action: hardware_script
     script: |
       import sys
@@ -114,29 +114,34 @@ tests:
 
       i2c = I2C(1)
 
-      # Use WSEN-HIDS as the reference thermometer
+      # Initialize all sensors
       from wsen_hids.device import WSEN_HIDS
       ref = WSEN_HIDS(i2c)
-      ref_t = ref.temperature()
 
-      # Read raw values from each sensor before calibration
       from hts221.device import HTS221
       hts = HTS221(i2c)
       hts.poweroff()
       sleep_ms(20)
       hts.poweron()
       sleep_ms(50)
-      hts_t = hts.temperature()
 
       from wsen_pads.device import WSEN_PADS
       pads = WSEN_PADS(i2c)
-      pads_t = pads.temperature()
 
       from lis2mdl.device import LIS2MDL
       mag = LIS2MDL(i2c)
+
+      # Read reference just before each sensor to minimize drift
+      ref_t = ref.temperature()
+      hts_t = hts.temperature()
+
+      ref_t2 = ref.temperature()
+      pads_t = pads.temperature()
+
+      ref_t3 = ref.temperature()
       mag_t = mag.read_temperature_c()
 
-      print('--- Before calibration ---')
+      print('--- Before offset alignment ---')
       print('  WSEN-HIDS (ref): ' + str(round(ref_t, 2)) + ' C')
       print('  HTS221:          ' + str(round(hts_t, 2)) + ' C')
       print('  WSEN-PADS:       ' + str(round(pads_t, 2)) + ' C')
@@ -145,35 +150,34 @@ tests:
       spread_before = max(hts_t, pads_t, mag_t, ref_t) - min(hts_t, pads_t, mag_t, ref_t)
       print('  Spread: ' + str(round(spread_before, 2)) + ' C')
 
-      # Calibrate each sensor using two-point method
-      # Use a synthetic second point: measured+10 -> ref+10
-      hts.calibrate_temperature(ref_t, hts_t, ref_t + 10.0, hts_t + 10.0)
-      pads.calibrate_temperature(ref_t, pads_t, ref_t + 10.0, pads_t + 10.0)
-      mag.calibrate_temperature(ref_t, mag_t, ref_t + 10.0, mag_t + 10.0)
+      # Apply offset to align each sensor to the reference reading
+      hts.set_temp_offset(ref_t - hts_t)
+      pads.set_temp_offset(ref_t2 - pads_t)
+      mag.set_temp_offset(ref_t3 - mag_t)
 
-      # Re-read after calibration
+      # Re-read after offset alignment
       sleep_ms(50)
-      ref_t2 = ref.temperature()
+      ref_t4 = ref.temperature()
       hts_t2 = hts.temperature()
       pads_t2 = pads.temperature()
       mag_t2 = mag.read_temperature_c()
 
-      print('--- After calibration ---')
-      print('  WSEN-HIDS (ref): ' + str(round(ref_t2, 2)) + ' C')
+      print('--- After offset alignment ---')
+      print('  WSEN-HIDS (ref): ' + str(round(ref_t4, 2)) + ' C')
       print('  HTS221:          ' + str(round(hts_t2, 2)) + ' C')
       print('  WSEN-PADS:       ' + str(round(pads_t2, 2)) + ' C')
       print('  LIS2MDL:         ' + str(round(mag_t2, 2)) + ' C')
 
-      spread_after = max(hts_t2, pads_t2, mag_t2, ref_t2) - min(hts_t2, pads_t2, mag_t2, ref_t2)
+      spread_after = max(hts_t2, pads_t2, mag_t2, ref_t4) - min(hts_t2, pads_t2, mag_t2, ref_t4)
       print('  Spread: ' + str(round(spread_after, 2)) + ' C')
 
-      # After calibration, spread should be < 2°C
+      # After alignment, spread should be < 2°C
       result = spread_after < 2.0
     expect_true: true
     mode: [hardware]
 
   - name: "Temperature values feel correct"
     action: manual
-    prompt: "Les températures calibrées sont-elles cohérentes entre elles et avec l'ambiance ?"
+    prompt: "Les températures lues sont-elles cohérentes entre elles et avec l'ambiance ?"
     expect_true: true
     mode: [hardware]