diff --git a/Firmware/.gitignore b/Firmware/.gitignore
new file mode 100644
index 0000000..1b2211d
--- /dev/null
+++ b/Firmware/.gitignore
@@ -0,0 +1 @@
+build*
diff --git a/Firmware/Zero2Go-Omini/Dockerfile b/Firmware/Zero2Go-Omini/Dockerfile
new file mode 100644
index 0000000..5412c11
--- /dev/null
+++ b/Firmware/Zero2Go-Omini/Dockerfile
@@ -0,0 +1,31 @@
+FROM ubuntu:19.10
+
+RUN apt-get -yq update \
+ && apt-get -yq --no-install-suggests --no-install-recommends install \
+    wget \
+    git \
+    avrdude \
+    python-serial \
+    xz-utils \
+    ca-certificates \
+    make \
+ && apt-get clean \
+ && rm -rf /var/lib/apt/lists/*
+
+RUN wget https://downloads.arduino.cc/arduino-1.8.10-linux64.tar.xz \
+ && tar xf *.tar.xz -C /opt \
+ && rm *.tar.xz
+
+RUN git clone https://github.com/sudar/Arduino-Makefile -b 1.5.2 /opt/arduino-mk
+
+RUN git clone https://github.com/SpenceKonde/ATTinyCore.git -b v1.1.4 /opt/ATTinyCore
+
+RUN git clone https://github.com/orangkucing/WireS.git /opt/WireS \
+  && cd /opt/WireS \
+  && git reset --hard 776ffa23b6b9b8ae17b21e10357e22b09e7e9510
+
+RUN git clone https://github.com/orangkucing/analogComp /opt/analogComp
+
+WORKDIR /src
+
+CMD ["make"]
diff --git a/Firmware/Zero2Go-Omini/Makefile b/Firmware/Zero2Go-Omini/Makefile
new file mode 100644
index 0000000..4a88fa7
--- /dev/null
+++ b/Firmware/Zero2Go-Omini/Makefile
@@ -0,0 +1,16 @@
+TARGET = Zero2Go-Omini.ino
+ARDUINO_DIR = /opt/arduino-1.8.10
+USER_LIB_PATH = /opt
+
+# Programmer type:
+ISP_PROG = usbasp
+
+# https://github.com/SpenceKonde/ATTinyCore (1.5+)
+ALTERNATE_CORE = ATTinyCore
+ALTERNATE_CORE_PATH = /opt/ATTinyCore
+BOARD_TAG = attinyx41
+BOARD_SUB = 841
+F_CPU = 8000000L
+
+# Path to the Arduino Makefile
+include /opt/arduino-mk/Arduino.mk
diff --git a/Firmware/Zero2Go-Omini/Zero2Go-Omini.ino b/Firmware/Zero2Go-Omini/Zero2Go-Omini.ino
index 085a084..f0e7c1f 100644
--- a/Firmware/Zero2Go-Omini/Zero2Go-Omini.ino
+++ b/Firmware/Zero2Go-Omini/Zero2Go-Omini.ino
@@ -63,6 +63,24 @@ volatile unsigned long buttonStateChangeTime = 0;
 
 volatile unsigned long voltageQueryTime = 0;
 
+void timer1_enable();
+void cutPower();
+void powerOn();
+void redLightOn();
+void suggestShutdown();
+void redLightOff();
+void initializeRegisters();
+void updateRegister(int index, byte value);
+float getVoltage(int pin);
+int getIntegerPart(float v);
+int getDecimalPart(float v);
+unsigned int getPowerCutPreloadTimer();
+void receiveEvent(int count);
+boolean addressEvent(uint16_t slaveAddress, uint8_t startCount);
+void requestEvent();
+void comparatorStatusChanged();
+void sleep();
+
 void setup() {
 
   // initialize pin states and make sure power is cut
diff --git a/README.md b/README.md
index f999ea5..9d19260 100644
--- a/README.md
+++ b/README.md
@@ -11,3 +11,19 @@ The firmware is compiled and uploaded to Zero2Go Omini via Arduino IDE (with ATT
 The software is written in BASH.
 
 More information about the firmware and software can be found in the user manual: http://www.uugear.com/doc/Zero2Go_Omini_UserManual.pdf
+
+# Firmware build instructions
+
+You can use the provided Dockerfile and Makefile (made with [Arduino-Makefile](https://github.com/sudar/Arduino-Makefile/)) to quickly set up a build environment with all the required dependencies.:
+
+```
+cd Firmware/Zero2Go-Omini
+docker build -t zero2go-omini .
+```
+
+The firmware can then be built with:
+
+```
+cd Firmware/Zero2Go-Omini
+docker run -ti -v $(pwd):/src zero2go-omini:latest
+```