added support for opto relay

examples/Modulino_Relay/Basic/Basic.ino

@@ -0,0 +1,25 @@
+#include <Modulino.h>
+
+ModulinoRelay relay;
+
+void setup() {
+  Serial.begin(115200);
+  Modulino.begin();
+  relay.begin();
+
+}
+void loop() {
+  relay.ON();
+  if(relay.getStatus())
+  {
+    Serial.println("Relay state ON!");
+  }
+  delay(1000);
+  relay.OFF();
+  if(!(relay.getStatus()))
+  {
+    Serial.println("Relay state OFF!");
+  }
+  Serial.println();
+  delay(1000);
+}

examples/Utilities/AddressChanger/AddressChanger.ino

@@ -34,6 +34,8 @@ String pinstrapToName(uint8_t pinstrap) {
       return "JOYSTICK";
     case 0x7C:
       return "BUTTONS";
+    case 0x28:
+      return "RELAY";
     case 0x76:
     case 0x74:
       return "ENCODER";

src/Modulino.h

@@ -571,4 +571,53 @@ class ModulinoDistance : public Module {
   //VL53L4ED_ResultsData_t results;
   float internal = NAN;
   _distance_api* api = nullptr;
-};
+};
+
+class ModulinoRelay : public Module {
+public:
+  ModulinoRelay(uint8_t address = 0xFF)
+    : Module(address, "RELAY") {}
+  bool update() {
+    uint8_t buf[3];
+    auto res = read((uint8_t*)buf, 3);
+    auto ret = res && (buf[0] != last_status[0] || buf[1] != last_status[1] || buf[2] != last_status[2]);
+    last_status[0] = buf[0];
+    last_status[1] = buf[1];
+    last_status[2] = buf[2];
+
+
+    return ret;
+  }
+  void ON() {
+    uint8_t buf[3];
+    buf[0] = 1;
+    buf[1] = 0;
+    buf[2] = 0;
+    write((uint8_t*)buf, 3);
+    return;
+  }
+  void OFF() {
+    uint8_t buf[3];
+    buf[0] = 0;
+    buf[1] = 0;
+    buf[2] = 0;
+    write((uint8_t*)buf, 3);
+    return;
+  }
+  bool getStatus() {
+    update();
+    return last_status[0];
+  }
+  virtual uint8_t discover() {
+    for (unsigned int i = 0; i < sizeof(match)/sizeof(match[0]); i++) {
+      if (scan(match[i])) {
+        return match[i];
+      }
+    }
+    return 0xFF;
+  }
+private:
+  bool last_status[3];
+protected:
+  uint8_t match[1] = { 0x28 };  // same as fw main.c
+};