added hardware specifications

hardware/tests/BT_Serial/BT_Serial.ino

@@ -0,0 +1,91 @@
+// SerialIn_SerialOut_004
+//
+// Uses hardware serial to talk to the host computer and Software
+// Serial for communication with the bluetooth module
+//
+// What ever is entered in the serial monitor is sent to the connected
+// device
+// Anything received from the connected device is copied to the serial
+// monitor
+//
+// Pins
+// BT VCC to Arduino 5V out.
+// BT GND to GND
+// Arduino D8 (SS RX) - BT TX no need voltage divider
+// Arduino D9 (SS TX) - BT RX through a voltage divider (5v to 3.3v)
+//
+// Setup procedure
+/*
+ * AT
+ * AT+ORGL
+ * // restart
+ * AT
+ * AT+NAME=Meeting Clock
+ * AT+NAME?
+ * AT+PSWD="1812"
+ * AT+PSWD?
+ * AT+UART=9600,1,0
+ * AT+UART?
+ */
+
+#include <SoftwareSerial.h>
+SoftwareSerial BTserial(5, 4); // RX, TX
+#define STATE_PIN 3
+
+char c = ' ';
+boolean NL = true;
+
+void setup()
+{
+  Serial.begin(9600);
+  Serial.print("Sketch:   ");   Serial.println(__FILE__);
+  Serial.print("Uploaded: ");   Serial.println(__DATE__);
+  Serial.println(" ");
+
+  BTserial.begin(38400); // for at mode
+  //BTserial.begin(9600); // for echo mode
+  Serial.println("BTserial started at 9600");
+  Serial.println(" ");
+
+  pinMode(STATE_PIN, INPUT);
+}
+
+bool state = false;
+void loop()
+{
+  if (digitalRead(STATE_PIN) != state) {
+    state = digitalRead(STATE_PIN);
+    Serial.print("! new BT state: ");
+    if (state) {
+      Serial.println("Connected");
+    } else {
+      Serial.println("Disconnected");
+    }
+  }
+  
+  // Read from the Bluetooth module and send to the Arduino Serial
+  // Monitor
+  if (BTserial.available())
+  {
+    c = BTserial.read();         Serial.write(c);
+  }
+
+
+  // Read from the Serial Monitor and send to the Bluetooth module
+  if (Serial.available())
+  {
+    c = Serial.read();
+    BTserial.write(c);
+
+    // Echo the user input to the main window. The ">" character
+    // indicates the user entered text.
+    if (NL) {
+      Serial.print(">");
+      NL = false;
+    }
+    Serial.write(c);
+    if (c == 10) {
+      NL = true;
+    }
+  }
+}