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ES32A08.h

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+#ifndef ES32A08_h
+#define ES32A08_h
+
+#include "Arduino.h"
+
+// ######### BOARD CONFIG REGION ##########################################
+
+#define PWR_LED_PIN 15 // "PWR" board Led
+
+// 74HC595D shift register pins (Relay + 4x7-Seg disp.)
+#define DATA_PIN 13
+#define LATCH_PIN 14
+#define CLOCK_PIN 27
+#define OE_PIN 4
+
+// 74HC165 shift register pins (Digital inputs)
+#define LOAD165_PIN 16
+#define CLK165_PIN 17
+#define DATA165_PIN 5
+
+// ######### USER CONFIG REGION ###########################################
+
+#define RESET_RELAY_ON false // State of the relays at boot
+#define RESET_LED_ON true    // State of the "PWR" LED at boot
+#define DIGIT_PERS 1000      // uS to hold the digit lit (1000=1ms default)
+
+// ######### CLASS DEFINITION REGION #####################################
+
+class ES32A08 {
+public:
+  void begin(); // Initialize the board and reset it
+
+  float readAnalogmA(int channel);       // Read single 4-20mA input
+  float readAnalogVoltage(int channel);  // Read single 0-10V input
+  int rawReadAnalogVoltage(int channel); // Raw read single 0-10V input
+
+  bool readButton(int buttonNumber);      // Read single button state
+  bool readDigitalInput(int inputNumber); // Read single digital input
+  uint8_t readDigitalInputs();            // Read all digital inputs
+
+  void setRelay(int relay, bool state);      // Set single relay
+  void setRelays(unsigned long relayStates); // Set all relays (i.e. 0b00000000)
+  void setPWRLED(bool state);                // Set "PWR" onboard LED
+
+  void reset();        // Open relays and clear display
+  void clearDisplay(); // Clear entire 7-seg display
+
+  void display(int number);          // Show a number on the 4-digit display
+  void display(float number);        // Show a float on the 4-digit display
+  void display(const char *message); // Show a 4-char message on the display
+
+  static void
+  updateRegisters(void *instance); // Task to continuosly feed the registers
+
+private:
+  byte displayBuffer[4]; // Buffer for the 4-digit display
+  byte currentRelays;    // Relays status
+  byte currentDigits;    // Selected digit(s)
+  byte currentSegments;  // Segments to display
+
+  uint8_t charToSegments(char c); // Char to segment conversion by LUT
+  void sendToShiftRegister(); // Send relays and display settings to the s.r.
+
+  // Pin definitions
+  const int mAInputPins[4] = {36, 39, 34, 35};      // In1 a In4 for 4-20mA
+  const int voltageInputPins[4] = {32, 33, 25, 26}; // V1 a V4 for 0-10V
+  const int buttonPins[4] = {18, 19, 21, 23};       // Onboard buttons 1-4
+
+  // 7-segment display digit selection
+  const byte digitNumber[8] = {
+      0b11111111, // none.
+      0b11111110, // digit 1.
+      0b11111101, // digit 2.
+      0b11111011, // digit 3.
+      0b11110111, // digit 4.
+      0b11111100, // digit 1+2.
+      0b11111000, // digit 1+2+3.
+      0b11110000  // digit 1+2+3+4.
+  };
+};
+
+#endif