init to commit it

Software/arduino/crawler_slave/Makefile

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+### DISCLAIMER
+### This is an example Makefile and it MUST be configured to suit your needs.
+### For detailed explanations about all the available options,
+### please refer to https://github.com/sudar/Arduino-Makefile/blob/master/arduino-mk-vars.md
+
+### PROJECT_DIR
+### This is the path to where you have created/cloned your project
+PROJECT_DIR       = $(shell dirname $(shell pwd))
+
+### ARDMK_DIR
+### Path to the Arduino-Makefile directory.
+ARDMK_DIR         = $(PROJECT_DIR)/Arduino-Makefile
+
+### ARDUINO_DIR
+### Path to the Arduino application and resources directory.
+ARDUINO_DIR       = /usr/share/arduino
+
+### USER_LIB_PATH
+### Path to where the your project's libraries are stored.
+USER_LIB_PATH     :=  $(realpath $(PROJECT_DIR)/lib)
+
+### BOARD_TAG & BOARD_SUB
+### For Arduino IDE 1.0.x
+### Only BOARD_TAG is needed. It must be set to the board you are currently using. (i.e uno, mega2560, etc.)
+# BOARD_TAG         = mega2560
+### For Arduino IDE 1.6.x
+### Both BOARD_TAG and BOARD_SUB are needed. They must be set to the board you are currently using. (i.e BOARD_TAG = uno, mega, etc. & BOARD_SUB = atmega2560, etc.)
+### Note: for the Arduino Uno, only BOARD_TAG is mandatory and BOARD_SUB can be equal to anything
+BOARD_TAG         = mega
+BOARD_SUB         = atmega2560
+
+### MONITOR_PORT
+### The port your board is connected to. Using an '*' tries all the ports and finds the right one. Choose one of the two.
+MONITOR_PORT      = /dev/ttyUSB*
+# MONITOR_PORT      = /dev/ttyACM*
+
+### MONITOR_BAUDRATE
+### It must be set to Serial baudrate value you are using.
+MONITOR_BAUDRATE  = 115200
+
+### AVR_TOOLS_DIR
+### Path to the AVR tools directory such as avr-gcc, avr-g++, etc.
+AVR_TOOLS_DIR     = /usr
+
+### AVRDUDE
+### Path to avrdude directory.
+AVRDUDE           = /usr/bin/avrdude
+
+### CFLAGS_STD
+CFLAGS_STD        = -std=gnu11
+
+### CXXFLAGS_STD
+### You can choose wich ever you like
+# CXXFLAGS_STD      = -std=gnu++11
+CXXFLAGS_STD      = -std=gnu++17
+
+
+### CPPFLAGS
+### Flags you might want to set for debugging purpose. Comment to stop.
+CXXFLAGS         += -pedantic -Wall -Wextra
+LDFLAGS          += -fdiagnostics-color
+
+### OBJDIR
+### Don't touch this!
+### This is were you put the binaries you just compile using 'make'
+CURRENT_DIR       = $(shell basename $(CURDIR))
+OBJDIR            = $(PROJECT_DIR)/build/$(CURRENT_DIR)/$(BOARD_TAG)
+
+### path to Arduino.mk, inside the ARDMK_DIR, don't touch.
+include $(ARDMK_DIR)/Arduino.mk

Software/arduino/crawler_slave/crawler_slave.ino

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+/* Crawler Slave
+ *  
+ *  This code runs on the crawler i2c network
+ *  and provides a cleaner, less CPU intensive control over PWM devices.
+ */
+
+#include <Wire.h>
+#include <Servo.h>
+
+// This servo is used to wipe and clean the camera lens
+Servo windowWiperServo;
+
+// Variables populated over i2c from master
+int id;
+int val;
+
+void setup() {
+  // For debugging
+  //Serial.begin(115200);
+  
+  // Attach the wiper servo to pin 9
+  windowWiperServo.attach(9);
+
+  // This is the address the pi will speak to us at
+  Wire.begin(0x4);
+  
+  // Call receiveEvent when data received                
+  Wire.onReceive(receiveEvent);
+
+  // Setup LED
+  pinMode(LED_BUILTIN, OUTPUT);
+  digitalWrite(LED_BUILTIN, LOW);
+
+  //Serial.println("Started");
+}
+
+// Just loop to keep the running code alive, and wait for events to happen.
+void loop() {
+  delay(50);
+}
+
+// This method runs when we receive a message
+void receiveEvent(int n) {
+  Wire.read(); // Remove smbus trash
+  if (true) { // Dont do anything if this is not true
+    id  = Wire.read(); // ID of the servo/device to access
+    val = Wire.read(); // Value to assign
+
+    //Serial.println(id);
+    //Serial.println(val);
+  
+    switch(id) {
+      case 1:
+        windowWiperServo.write(val);
+        break;
+    }
+  }
+
+  // Prevents a bug where if bytes are left in buffer, arduino crashes.
+  while (Wire.available()) {
+    Wire.read();
+  }
+}