Add current offset for POWER_MONITOR sensor (MarlinFirmware#18600)

vgadreau · Dec 9, 2020 · 5189535 · 5189535
1 parent 365b7ef
commit 5189535
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Showing 2 changed files with 2 additions and 1 deletion.
diff --git a/Marlin/Configuration_adv.h b/Marlin/Configuration_adv.h
@@ -3029,6 +3029,7 @@
 //#define POWER_MONITOR_VOLTAGE   // Monitor the system voltage
 #if EITHER(POWER_MONITOR_CURRENT, POWER_MONITOR_VOLTAGE)
   #define POWER_MONITOR_VOLTS_PER_AMP   0.05000   // Input voltage to the MCU analog pin per amp  - DO NOT apply more than ADC_VREF!
+  #define POWER_MONITOR_CURRENT_OFFSET -1         // Offset value for current sensors with linear function output  
   #define POWER_MONITOR_VOLTS_PER_VOLT  0.11786   // Input voltage to the MCU analog pin per volt - DO NOT apply more than ADC_VREF!
   #define POWER_MONITOR_FIXED_VOLTAGE   13.6      // Voltage for a current sensor with no voltage sensor (for power display)
 #endif

diff --git a/Marlin/src/feature/power_monitor.h b/Marlin/src/feature/power_monitor.h
@@ -35,7 +35,7 @@ struct pm_lpf_t {
     filter_buf = filter_buf - (filter_buf >> K_VALUE) + (uint32_t(sample) << K_SCALE);
   }
   void capture() {
-    value = filter_buf * (SCALE * (1.0f / (1UL << (PM_K_VALUE + PM_K_SCALE))));
+    value = filter_buf * (SCALE * (1.0f / (1UL << (PM_K_VALUE + PM_K_SCALE)))) + (POWER_MONITOR_CURRENT_OFFSET);
   }
   void reset(uint16_t reset_value = 0) {
     filter_buf = uint32_t(reset_value) << (K_VALUE + K_SCALE);