diff --git a/src/per/adc.cpp b/src/per/adc.cpp
index c0fa4cbb9..1ac21acf0 100644
--- a/src/per/adc.cpp
+++ b/src/per/adc.cpp
@@ -199,18 +199,21 @@ static dsy_adc adc;
 
 // Begin AdcChannelConfig Implementations
 
-void AdcChannelConfig::InitSingle(dsy_gpio_pin pin)
+void AdcChannelConfig::InitSingle(dsy_gpio_pin                      pin,
+                                  AdcChannelConfig::ConversionSpeed speed)
 {
     pin_.pin      = pin;
     mux_channels_ = 0;
     pin_.mode     = DSY_GPIO_MODE_ANALOG;
     pin_.pull     = DSY_GPIO_NOPULL;
+    speed_        = speed;
 }
-void AdcChannelConfig::InitMux(dsy_gpio_pin adc_pin,
-                               size_t       mux_channels,
-                               dsy_gpio_pin mux_0,
-                               dsy_gpio_pin mux_1,
-                               dsy_gpio_pin mux_2)
+void AdcChannelConfig::InitMux(dsy_gpio_pin                      adc_pin,
+                               size_t                            mux_channels,
+                               dsy_gpio_pin                      mux_0,
+                               dsy_gpio_pin                      mux_1,
+                               dsy_gpio_pin                      mux_2,
+                               AdcChannelConfig::ConversionSpeed speed)
 {
     size_t pins_to_init;
     // Init ADC Pin
@@ -228,6 +231,7 @@ void AdcChannelConfig::InitMux(dsy_gpio_pin adc_pin,
         mux_pin_[i].mode = DSY_GPIO_MODE_OUTPUT_PP;
         mux_pin_[i].pull = DSY_GPIO_NOPULL;
     }
+    speed_ = speed;
 }
 
 // Begin AdcHandle Implementations
@@ -359,7 +363,6 @@ void AdcHandle::Init(AdcChannelConfig* cfg,
     }
     // Configure Regular Channel
     // Configure Shared settings for all channels.
-    sConfig.SamplingTime = ADC_SAMPLETIME_8CYCLES_5;
     sConfig.SingleDiff   = ADC_SINGLE_ENDED;
     sConfig.OffsetNumber = ADC_OFFSET_NONE;
     sConfig.Offset       = 0;
@@ -367,6 +370,35 @@ void AdcHandle::Init(AdcChannelConfig* cfg,
     {
         const auto& cfg = adc.pin_cfg[i];
 
+        /** Handle per-channel conversions */
+        switch(cfg.speed_)
+        {
+            case AdcChannelConfig::SPEED_1CYCLES_5:
+                sConfig.SamplingTime = ADC_SAMPLETIME_1CYCLE_5;
+                break;
+            case AdcChannelConfig::SPEED_2CYCLES_5:
+                sConfig.SamplingTime = ADC_SAMPLETIME_2CYCLES_5;
+                break;
+            case AdcChannelConfig::SPEED_8CYCLES_5:
+                sConfig.SamplingTime = ADC_SAMPLETIME_8CYCLES_5;
+                break;
+            case AdcChannelConfig::SPEED_16CYCLES_5:
+                sConfig.SamplingTime = ADC_SAMPLETIME_16CYCLES_5;
+                break;
+            case AdcChannelConfig::SPEED_32CYCLES_5:
+                sConfig.SamplingTime = ADC_SAMPLETIME_32CYCLES_5;
+                break;
+            case AdcChannelConfig::SPEED_64CYCLES_5:
+                sConfig.SamplingTime = ADC_SAMPLETIME_64CYCLES_5;
+                break;
+            case AdcChannelConfig::SPEED_387CYCLES_5:
+                sConfig.SamplingTime = ADC_SAMPLETIME_387CYCLES_5;
+                break;
+            case AdcChannelConfig::SPEED_810CYCLES_5:
+                sConfig.SamplingTime = ADC_SAMPLETIME_810CYCLES_5;
+                break;
+        }
+
         // init ADC pin
         dsy_gpio_init(&cfg.pin_);
 
diff --git a/src/per/adc.h b/src/per/adc.h
index bb3161a04..14db03927 100644
--- a/src/per/adc.h
+++ b/src/per/adc.h
@@ -39,10 +39,24 @@ struct AdcChannelConfig
         MUX_SEL_LAST, /**< & */
     };
 
+    /** \brief per channel conversion speed added to fixed time based on bitdepth, etc. */
+    enum ConversionSpeed
+    {
+        SPEED_1CYCLES_5,
+        SPEED_2CYCLES_5,
+        SPEED_8CYCLES_5,
+        SPEED_16CYCLES_5,
+        SPEED_32CYCLES_5,
+        SPEED_64CYCLES_5,
+        SPEED_387CYCLES_5,
+        SPEED_810CYCLES_5,
+    };
+
     /** Initializes a single ADC pin as an ADC. 
     \param pin Pin to init.
+    \param speed conversion speed for this pin defaults to 8.5 cycles
      */
-    void InitSingle(dsy_gpio_pin pin);
+    void InitSingle(dsy_gpio_pin pin, ConversionSpeed speed = SPEED_8CYCLES_5);
 
     /** 
     Initializes a single ADC pin as a Multiplexed ADC.
@@ -50,21 +64,24 @@ struct AdcChannelConfig
     You only need to supply the mux pins that are required,
     e.g. a 4052 mux would only require mux_0 and mux_1.
     Internal Callbacks handle the pin addressing.
+    \param adc_pin &
     \param mux_channels must be 1-8
     \param mux_0 First mux pin
     \param mux_1 Second mux pin
     \param mux_2 Third mux pin
-    \param adc_pin &
+    \param speed conversion speed for this pin defaults to 8.5 cycles
     */
-    void InitMux(dsy_gpio_pin adc_pin,
-                 size_t       mux_channels,
-                 dsy_gpio_pin mux_0,
-                 dsy_gpio_pin mux_1 = {DSY_GPIOX, 0},
-                 dsy_gpio_pin mux_2 = {DSY_GPIOX, 0});
-
-    dsy_gpio pin_;                   /**< & */
-    dsy_gpio mux_pin_[MUX_SEL_LAST]; /**< & */
-    uint8_t  mux_channels_;          /**< & */
+    void InitMux(dsy_gpio_pin    adc_pin,
+                 size_t          mux_channels,
+                 dsy_gpio_pin    mux_0,
+                 dsy_gpio_pin    mux_1 = {DSY_GPIOX, 0},
+                 dsy_gpio_pin    mux_2 = {DSY_GPIOX, 0},
+                 ConversionSpeed speed = SPEED_8CYCLES_5);
+
+    dsy_gpio        pin_;                   /**< & */
+    dsy_gpio        mux_pin_[MUX_SEL_LAST]; /**< & */
+    uint8_t         mux_channels_;          /**< & */
+    ConversionSpeed speed_;
 };
 
 /**