Implemented button input using 74HC165 shift registers.

arduino/ShiftInput.h

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+/*
+Copyright 2018 Sam Stevens
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+ */
+
+#ifndef UVM_SHIFTINPUT_H
+#define UVM_SHIFTINPUT_H
+
+#include <stdint.h>
+
+class ShiftInput {
+    uint8_t *input;
+    uint8_t chipCount;
+    uint8_t loadPin;
+    uint8_t clockPin;
+    uint8_t clockInhPin;
+    uint8_t dataPin;
+  public:
+    ShiftInput(uint8_t chipCount, uint8_t loadPin, uint8_t clockPin, uint8_t clockInhPin, uint8_t dataPin);
+    uint8_t getChipCount();
+    uint8_t *getInput();
+    bool updateInput();
+};
+
+#endif //UVM_SHIFTINPUT_H