diff --git a/drivers/analog/analog.hpp b/drivers/analog/analog.hpp
index 7f321b0d..d51795a8 100644
--- a/drivers/analog/analog.hpp
+++ b/drivers/analog/analog.hpp
@@ -11,7 +11,7 @@ namespace pimoroni {
   public:
     Analog(uint pin, float amplifier_gain = 1.0f, float resistor = 0.0f, float offset = 0.0f) :
     pin(pin), amplifier_gain(amplifier_gain), resistor(resistor), offset(offset) {
-      adc_init();
+      if (!(adc_hw->cs & ADC_CS_EN_BITS)) adc_init();
 
       //Make sure GPIO is high-impedance, no pullups etc
       adc_gpio_init(pin);
diff --git a/libraries/adcfft/adcfft.cpp b/libraries/adcfft/adcfft.cpp
index e5433d57..a28fdd1d 100644
--- a/libraries/adcfft/adcfft.cpp
+++ b/libraries/adcfft/adcfft.cpp
@@ -47,7 +47,7 @@ void ADCFFT::init() {
 
     // Initialize the ADC harware
     // (resets it, enables the clock, spins until the hardware is ready)
-    adc_init();
+    if (!(adc_hw->cs & ADC_CS_EN_BITS)) adc_init();
 
     // Select analog mux input (0...3 are GPIO 26, 27, 28, 29; 4 is temp sensor)
     adc_select_input(adc_channel);
diff --git a/libraries/cosmic_unicorn/cosmic_unicorn.cpp b/libraries/cosmic_unicorn/cosmic_unicorn.cpp
index 5d0dc26e..2db59201 100644
--- a/libraries/cosmic_unicorn/cosmic_unicorn.cpp
+++ b/libraries/cosmic_unicorn/cosmic_unicorn.cpp
@@ -149,7 +149,7 @@ namespace pimoroni {
     }
 
     // setup light sensor adc
-    adc_init();
+    if (!(adc_hw->cs & ADC_CS_EN_BITS)) adc_init();
     adc_gpio_init(LIGHT_SENSOR);
 
     gpio_init(COLUMN_CLOCK); gpio_set_dir(COLUMN_CLOCK, GPIO_OUT); gpio_put(COLUMN_CLOCK, false);
diff --git a/libraries/galactic_unicorn/galactic_unicorn.cpp b/libraries/galactic_unicorn/galactic_unicorn.cpp
index da2bc041..c9587e18 100644
--- a/libraries/galactic_unicorn/galactic_unicorn.cpp
+++ b/libraries/galactic_unicorn/galactic_unicorn.cpp
@@ -149,7 +149,7 @@ namespace pimoroni {
     }
 
     // setup light sensor adc
-    adc_init();
+    if (!(adc_hw->cs & ADC_CS_EN_BITS)) adc_init();
     adc_gpio_init(LIGHT_SENSOR);
 
     gpio_init(COLUMN_CLOCK); gpio_set_dir(COLUMN_CLOCK, GPIO_OUT); gpio_put(COLUMN_CLOCK, false);
diff --git a/libraries/stellar_unicorn/stellar_unicorn.cpp b/libraries/stellar_unicorn/stellar_unicorn.cpp
index 3917aa5f..3b4bde04 100644
--- a/libraries/stellar_unicorn/stellar_unicorn.cpp
+++ b/libraries/stellar_unicorn/stellar_unicorn.cpp
@@ -149,7 +149,7 @@ namespace pimoroni {
     }
 
     // setup light sensor adc
-    adc_init();
+    if (!(adc_hw->cs & ADC_CS_EN_BITS)) adc_init();
     adc_gpio_init(LIGHT_SENSOR);
 
     gpio_init(COLUMN_CLOCK); gpio_set_dir(COLUMN_CLOCK, GPIO_OUT); gpio_put(COLUMN_CLOCK, false);