diff --git a/build.sh b/build.sh
index c661e90..659940c 100755
--- a/build.sh
+++ b/build.sh
@@ -1,13 +1,35 @@
 #!/bin/bash
 
-if [ "$1" != "" ]; then
+if [ "$1" == "" ]; then
+  echo "Give one of the targets: build, clean, upload"
+  echo "If you want to use a project directory different"
+  echo "than the current directory, give it as a second"
+  echo "argument."
+  exit 1
+fi
+
+if [ "$2" != "" ]; then
   PROJECT_DIR=$1
 else
   PROJECT_DIR=$PWD
 fi
 
-pushd $PROJECT_DIR/libraries/esp8266boilerplate/ConfigGenerator && ./configGen.sh && popd
-env ARDUINO_SKETCHBOOK_DIR=$PROJECT_DIR arduino-cli compile --fqbn=esp8266:esp8266:nodemcu $PROJECT_DIR/sketch
-cp sketch/sketch.esp8266.esp8266.nodemcu.* .
+
+if [ "$1" == "build" ]; then
+  pushd $PROJECT_DIR/libraries/esp8266boilerplate/ConfigGenerator && ./configGen.sh && popd
+  env ARDUINO_SKETCHBOOK_DIR=$PROJECT_DIR arduino-cli compile --fqbn=esp8266:esp8266:nodemcu $PROJECT_DIR/sketch
+  cp sketch/sketch.esp8266.esp8266.nodemcu.* .
+elif [ "$1" == "clean" ]; then
+  for D in libraries/includes/configuration.h libraries/includes/configuration.cpp sketch/sketch.esp8266.esp8266.nodemcu.bin sketch/sketch.esp8266.esp8266.nodemcu.elf sketch.esp8266.esp8266.nodemcu.bin sketch.esp8266.esp8266.nodemcu.elf; do
+    echo -n "About to delete $D ... "
+    rm $PROJECT_DIR/$D && echo "done"
+  done
+elif [ "$1" == "upload" ]; then
+  echo "About to upload to device"
+else
+  echo "Unknown subcommand '$1'"
+  exit 1
+fi
+