diff --git a/.github/workflows/compile_examples.yml b/.github/workflows/compile_examples.yml
index 9708bbf5f..01bb094ce 100644
--- a/.github/workflows/compile_examples.yml
+++ b/.github/workflows/compile_examples.yml
@@ -41,6 +41,10 @@ jobs:
             platforms: |
               - name: esp8266:esp8266
                 source-url: https://arduino.esp8266.com/stable/package_esp8266com_index.json
+          # SAMD boards. There is also an Adrafruit fork of this core, and the two seem to have diverged, considerably. I have no idea on the differences.
+          - fqbn: arduino:samd:adafruit_circuitplayground_m0
+            platforms: |
+              - name: arduino:samd
 
     steps:
       - name: Checkout repository
diff --git a/MozziGuts_impl_SAMD.hpp b/MozziGuts_impl_SAMD.hpp
index a8f1be715..03cc61910 100644
--- a/MozziGuts_impl_SAMD.hpp
+++ b/MozziGuts_impl_SAMD.hpp
@@ -123,7 +123,7 @@ static void startAudio() {
   }
 
 #endif
-  analogWriteResolution(10);
+  analogWriteResolution(AUDIO_BITS);
 #if (EXTERNAL_AUDIO_OUTPUT != true)
   analogWrite(AUDIO_CHANNEL_1_PIN, 0);
 #endif
diff --git a/README.md b/README.md
index d55bb3df3..3f1baafeb 100644
--- a/README.md
+++ b/README.md
@@ -230,6 +230,14 @@ Some of the differences for Teensy 4.*:
 
 - Contrary to the Teensy 3, the Teensy 4 do not have any DAC. The output is done on pin A8 (PWM) by default (editable in `AudioConfigTeensy4.h`
 
+### SAMD21 architecture (Arduino Circuitplayground M0 and others)
+port by Adrian Freed
+
+- Currently, only output on the inbuilt DAC (pin DAC0) is supported. So, obviously, boards without a DAC are not yet convered (in theory you can still use EXTERNAL_AUDIO_OUTPUT)
+- Output resolution is fixed at 10 bits. If your board supports more, configure in AudioConfigSAMD21.h
+- mozziAnalogRead() and AUDIO_INPUT are not implemented (contributions welcome)
+- We don't have a lot of data, which boards this port has been tested on. Success or not, let us know, if you are using Mozzi on SAMD21 boards
+
 ### ESP8266
 port by Thomas Friedrichsmeier