diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e6829e98bf..5345c91936 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -33,6 +33,9 @@ jobs:
           - type: board
             name: sparkfun-promicro
             examples: true
+          - type: board
+            name: sparkfun-promini-3v3
+            examples: true
           - type: board
             name: sparkfun-promini-5v
             examples: true
diff --git a/Cargo.toml b/Cargo.toml
index 33bffe79e4..3518c13f66 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -31,6 +31,7 @@ members = [
     "examples/arduino-uno",
     "examples/nano168",
     "examples/sparkfun-promicro",
+    "examples/sparkfun-promini-3v3",
     "examples/sparkfun-promini-5v",
     "examples/trinket-pro",
     "examples/trinket",
diff --git a/arduino-hal/Cargo.toml b/arduino-hal/Cargo.toml
index 4cd6746ca5..97a4244e57 100644
--- a/arduino-hal/Cargo.toml
+++ b/arduino-hal/Cargo.toml
@@ -11,8 +11,8 @@ rt = ["avr-device/rt"]
 critical-section-impl = ["avr-device/critical-section-impl"]
 
 board-selected = []
-mcu-atmega=[]
-mcu-attiny=[]
+mcu-atmega = []
+mcu-attiny = []
 arduino-diecimila = ["mcu-atmega", "atmega-hal/atmega168", "board-selected"]
 arduino-leonardo = ["mcu-atmega", "atmega-hal/atmega32u4", "board-selected"]
 arduino-mega2560 = ["mcu-atmega", "atmega-hal/atmega2560", "board-selected"]
@@ -21,6 +21,7 @@ arduino-nano = ["mcu-atmega", "atmega-hal/atmega328p", "atmega-hal/enable-extra-
 arduino-uno = ["mcu-atmega", "atmega-hal/atmega328p", "board-selected"]
 trinket-pro = ["mcu-atmega", "atmega-hal/atmega328p", "board-selected"]
 sparkfun-promicro = ["mcu-atmega", "atmega-hal/atmega32u4", "board-selected"]
+sparkfun-promini-3v3 = ["mcu-atmega", "atmega-hal/atmega328p", "atmega-hal/enable-extra-adc", "board-selected"]
 sparkfun-promini-5v = ["mcu-atmega", "atmega-hal/atmega328p", "atmega-hal/enable-extra-adc", "board-selected"]
 trinket = ["mcu-attiny", "attiny-hal/attiny85", "board-selected"]
 nano168 = ["mcu-atmega", "atmega-hal/atmega168", "atmega-hal/enable-extra-adc", "board-selected"]
diff --git a/arduino-hal/src/clock.rs b/arduino-hal/src/clock.rs
index 81204945c2..7c53088015 100644
--- a/arduino-hal/src/clock.rs
+++ b/arduino-hal/src/clock.rs
@@ -27,6 +27,6 @@ pub(crate) mod default {
         feature = "nano168",
     ))]
     pub type DefaultClock = avr_hal_generic::clock::MHz16;
-    #[cfg(feature = "trinket")]
+    #[cfg(any(feature = "trinket", feature = "sparkfun-promini-3v3"))]
     pub type DefaultClock = avr_hal_generic::clock::MHz8;
 }
diff --git a/arduino-hal/src/lib.rs b/arduino-hal/src/lib.rs
index f866faf27d..e6538dfebc 100644
--- a/arduino-hal/src/lib.rs
+++ b/arduino-hal/src/lib.rs
@@ -13,6 +13,10 @@
 #![cfg_attr(feature = "arduino-nano", doc = "**Arduino Nano**.")]
 #![cfg_attr(feature = "arduino-uno", doc = "**Arduino Uno**.")]
 #![cfg_attr(feature = "sparkfun-promicro", doc = "**SparkFun ProMicro**.")]
+#![cfg_attr(
+    feature = "sparkfun-promini-3v3",
+    doc = "**SparkFun ProMini 3.3V (8MHz)**."
+)]
 #![cfg_attr(
     feature = "sparkfun-promini-5v",
     doc = "**SparkFun ProMini 5V (16MHz)**."
@@ -63,6 +67,7 @@ compile_error!(
     * arduino-nano
     * arduino-uno
     * sparkfun-promicro
+    * sparkfun-promini-3v3
     * sparkfun-promini-5v
     * trinket-pro
     * trinket
@@ -265,7 +270,8 @@ macro_rules! default_serial {
 #[cfg(any(
     feature = "arduino-nano",
     feature = "nano168",
-    feature = "sparkfun-promini-5v"
+    feature = "sparkfun-promini-3v3",
+    feature = "sparkfun-promini-5v",
 ))]
 #[macro_export]
 macro_rules! default_serial {
diff --git a/arduino-hal/src/port/mod.rs b/arduino-hal/src/port/mod.rs
index f4ed4d6a9b..160d3f9811 100644
--- a/arduino-hal/src/port/mod.rs
+++ b/arduino-hal/src/port/mod.rs
@@ -31,6 +31,7 @@ pub use mega::*;
     feature = "arduino-nano",
     feature = "arduino-uno",
     feature = "nano168",
+    feature = "sparkfun-promini-3v3",
     feature = "sparkfun-promini-5v"
 ))]
 mod uno;
@@ -38,6 +39,7 @@ mod uno;
     feature = "arduino-nano",
     feature = "arduino-uno",
     feature = "nano168",
+    feature = "sparkfun-promini-3v3",
     feature = "sparkfun-promini-5v"
 ))]
 pub use uno::*;
diff --git a/arduino-hal/src/port/uno.rs b/arduino-hal/src/port/uno.rs
index c3b53c9bba..ae193edd27 100644
--- a/arduino-hal/src/port/uno.rs
+++ b/arduino-hal/src/port/uno.rs
@@ -1,7 +1,7 @@
 pub use atmega_hal::port::{mode, Pin, PinMode, PinOps};
 
 avr_hal_generic::renamed_pins! {
-    /// Pins of the **Arduino Uno**, **Arduino Nano**, and **SparkFun ProMini 5V (16MHz)**.
+    /// Pins of the **Arduino Uno**, **Arduino Nano**, **SparkFun ProMini 3.3V (8Mhz)**, and **SparkFun ProMini 5V (16MHz)**.
     ///
     /// This struct is best initialized via the [`arduino_hal::pins!()`][crate::pins] macro.
     pub struct Pins {
diff --git a/examples/sparkfun-promini-3v3/.cargo/config.toml b/examples/sparkfun-promini-3v3/.cargo/config.toml
new file mode 100644
index 0000000000..a7c430c58c
--- /dev/null
+++ b/examples/sparkfun-promini-3v3/.cargo/config.toml
@@ -0,0 +1,8 @@
+[build]
+target = "../../avr-specs/avr-atmega328p.json"
+
+[target.'cfg(target_arch = "avr")']
+runner = "ravedude promini-3v3"
+
+[unstable]
+build-std = ["core"]
diff --git a/examples/sparkfun-promini-3v3/Cargo.toml b/examples/sparkfun-promini-3v3/Cargo.toml
new file mode 100644
index 0000000000..0ca64c6bb3
--- /dev/null
+++ b/examples/sparkfun-promini-3v3/Cargo.toml
@@ -0,0 +1,20 @@
+[package]
+name = "sparkfun-promini-3v3-examples"
+version = "0.0.0"
+authors = ["Rahix <rahix@rahix.de>"]
+edition = "2021"
+publish = false
+
+[dependencies]
+panic-halt = "0.2.0"
+ufmt = "0.2.0"
+nb = "1.1.0"
+embedded-hal = "1.0"
+
+[dependencies.embedded-hal-v0]
+version = "0.2.3"
+package = "embedded-hal"
+
+[dependencies.arduino-hal]
+path = "../../arduino-hal/"
+features = ["sparkfun-promini-3v3"]
diff --git a/examples/sparkfun-promini-3v3/src/bin/promini-3v3-blink.rs b/examples/sparkfun-promini-3v3/src/bin/promini-3v3-blink.rs
new file mode 100644
index 0000000000..8650f1274d
--- /dev/null
+++ b/examples/sparkfun-promini-3v3/src/bin/promini-3v3-blink.rs
@@ -0,0 +1,25 @@
+#![no_std]
+#![no_main]
+
+use panic_halt as _;
+
+#[arduino_hal::entry]
+fn main() -> ! {
+    let dp = arduino_hal::Peripherals::take().unwrap();
+    let pins = arduino_hal::pins!(dp);
+
+    // Digital pin 13 is also connected to an onboard LED marked "L"
+    let mut led = pins.d13.into_output();
+    led.set_high();
+
+    loop {
+        led.toggle();
+        arduino_hal::delay_ms(100);
+        led.toggle();
+        arduino_hal::delay_ms(100);
+        led.toggle();
+        arduino_hal::delay_ms(100);
+        led.toggle();
+        arduino_hal::delay_ms(800);
+    }
+}
diff --git a/ravedude/src/board.rs b/ravedude/src/board.rs
index 3882b56045..5bb3991327 100644
--- a/ravedude/src/board.rs
+++ b/ravedude/src/board.rs
@@ -18,6 +18,7 @@ pub fn get_board(board: &str) -> Option<Box<dyn Board>> {
         "mega1280" => Box::new(ArduinoMega1280),
         "diecimila" => Box::new(ArduinoDiecimila),
         "promicro" => Box::new(SparkFunProMicro),
+        "promini-3v3" => Box::new(SparkFunProMini3V),
         "promini-5v" => Box::new(SparkFunProMini5V),
         "trinket-pro" => Box::new(TrinketPro),
         "trinket" => Box::new(Trinket),
@@ -313,6 +314,31 @@ impl Board for SparkFunProMicro {
     }
 }
 
+struct SparkFunProMini3V;
+
+impl Board for SparkFunProMini3V {
+    fn display_name(&self) -> &str {
+        "SparkFun Pro Mini 3.3V (8MHz)"
+    }
+
+    fn needs_reset(&self) -> Option<&str> {
+        None
+    }
+
+    fn avrdude_options(&self) -> avrdude::AvrdudeOptions {
+        avrdude::AvrdudeOptions {
+            programmer: "arduino",
+            partno: "atmega328p",
+            baudrate: Some(57600),
+            do_chip_erase: true,
+        }
+    }
+
+    fn guess_port(&self) -> Option<anyhow::Result<std::path::PathBuf>> {
+        Some(Err(anyhow::anyhow!("Not able to guess port")))
+    }
+}
+
 struct SparkFunProMini5V;
 
 impl Board for SparkFunProMini5V {
diff --git a/ravedude/src/main.rs b/ravedude/src/main.rs
index 5722704100..d91ec780f9 100644
--- a/ravedude/src/main.rs
+++ b/ravedude/src/main.rs
@@ -65,6 +65,7 @@ struct Args {
     /// * mega1280
     /// * diecimila
     /// * promicro
+    /// * promini-3v3
     /// * promini-5v
     /// * trinket-pro
     /// * trinket