描述

使用 IO 擴展器和繼電器擴展器通過鍵盤控制繼電器。

需要使用鍵盤控制繼電器？那么您需要帶繼電器擴展器的IO 擴展器。每個 IO 擴展器最多可以控制 16 個菊花鏈式繼電器擴展器，總共 256 個繼電器。然后使用連接到 IO 擴展器的鍵盤手動控制每個繼電器。

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使用FCB Maker將 7 或 8 個數(shù)字引腳轉(zhuǎn)換為 1 個模擬引腳。然后連接 3x4 或 4x4 數(shù)字鍵盤。

接線圖

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注意：在上面的接線圖中，IO Expander 和 Arduino Nano 由第一個繼電器板供電。所有繼電器擴展器都由它們所連接的繼電器板供電。

輸入繼電器編號，然后按“#”鍵打開繼電器。要關(guān)閉繼電器，請使用“*”鍵。
/* IO Expander

 *  
 * Relay Keypad
 *
 */

#include 
#include "IOExpander.h"
#include 

//#define SERIAL_DEBUG
#define MAX_RELAYS    64

#ifdef SERIAL_DEBUG
SoftwareSerial swSerial(8,7);
#endif

char cmd[16];
char key[16] = {};

#define KEYPAD_4x3
//#define KEYPAD_4x4

#ifdef KEYPAD_4x3
#define MAX_KEYS    12

int thresholds[MAX_KEYS] = {18,329,598,1000,1183,1346,1603,1723,1833,2009,2093,2172};
char keypad[MAX_KEYS] = {'1','2','3','4','5','6','7','8','9','*','0','#'};
#endif

#ifdef KEYPAD_4x4
#define MAX_KEYS    16

int thresholds[MAX_KEYS] = {105,394,617,847,1049,1220,1357,1502,1634,1748,1840,1939,2031,2110,2177,2249};
char keypad[MAX_KEYS[ = {'1','2','3','A','4','5','6','B','7','8','9','C','*','0','#','D'};
#endif

void setup()
{
  int i;
 
  Serial.begin(115200);

#ifdef SERIAL_DEBUG
  swSerial.begin(115200);
  swSerialEcho = &swSerial;
  swSerial.println("DEBUG");
#endif  
  wdt_enable(WDTO_8S);

  delay(100);   // Wait 100 ms for IO Expander Title
  while (Serial.available()) Serial.read(); // Flush RX buffer
 
  sprintf(cmd, "eb%d", MAX_RELAYS / 16);
  SerialCmdDone(cmd);

  // Configure keypad
  SerialCmdDone("s2t1d;sc0,0");
  Serial.print("sc");
  for (i = 0; i < MAX_KEYS; i++)
  {
  if (i) Serial.print(",");
    Serial.print(thresholds[i]);
    Serial.print(","");
    Serial.print(keypad[i]);
    Serial.print(""");
  }
  SerialCmdDone(";sd100");   // Keypad debounce 100ms
}

void loop()
{
  int i,relay;
  char ch;
 
  SerialCmd("s2r");
  int len = strlen(key);
  SerialReadString(key+len, sizeof(key)-len); // Concatinate keypad characters
  SerialReadUntilDone();

  for (i = 0; i < strlen(key); i++) {
    ch = key[i];
  if (!isdigit(ch)) {
      key[i] = NULL;
  if (ch == '*' || ch == '#') {
        relay = atoi(key);
  if (relay > 0 && relay <= MAX_RELAYS) {
          Serial.print("e");
          Serial.print(relay);
  if (ch == '#') Serial.println("o"); // Turn on relay
  else Serial.println('f');   // Turn off relay
          SerialReadUntilDone();  // Wait for the '>' prompt
  }
  }
  strcpy(key, key+i+1);
  break;
  }
  }
 
  wdt_reset();
  delay(100);
}

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