insure export is capital

lib/bus.js

@@ -19,4 +19,6 @@ class Bus {
 
 } // end of Bus Class
 
-module.exports = Bus;
+module.exports = {
+  Bus
+};

lib/device.js

@@ -3,48 +3,47 @@
 // **********************************
 
 class Device {
-// bus is i2c-bus bus object
-        constructor(bus, address, opts) {
-            this.bus = bus.methods  // artifact of adapting  ic2-bus to class format
-            this.address = address
-            if (opts){
-            this.id = opts.id  // must be unique within a bus
-            this.desc = opts.desc
-            }
-
-        }
-
-        readRaw(length,buffer) {
-            return this.bus.i2cRead_p(this.address, length, buffer)
-        }
-
-        writeRaw(length,buffer) {
-           return this.bus.i2cWrite_p(this.address, length, buffer)
-        }
-
-        read(cmd) {
-            return this.bus.readByte_p(this.address, cmd)
-        }
-
-        write(cmd, byte) {
-            return this.bus.writeByte_p(this.address, cmd, byte)
-        }
-
-
-        read2(cmd) {
-            return this.bus.readWord_p(this.address, cmd)
-        }
-
-        write2(cmd, bytes) {
-            return this.bus.writeWord_p(this.address, cmd, bytes)
-        }
-
-        // command with more than two bytes following
-        readBytes(){}
-        writeBytes(){}
-
-
-
+  // bus is i2c-bus bus object
+  constructor(bus, address, opts) {
+    this.bus = bus.methods // artifact of adapting  ic2-bus to class format
+    this.address = address
+    if (opts) {
+      this.id = opts.id // must be unique within a bus
+      this.desc = opts.desc
     }
 
-    module.exports = Device;
+  }
+
+  readRaw(length, buffer) {
+    return this.bus.i2cRead_p(this.address, length, buffer)
+  }
+
+  writeRaw(length, buffer) {
+    return this.bus.i2cWrite_p(this.address, length, buffer)
+  }
+
+  read(cmd) {
+    return this.bus.readByte_p(this.address, cmd)
+  }
+
+  write(cmd, byte) {
+    return this.bus.writeByte_p(this.address, cmd, byte)
+  }
+
+  read2(cmd) {
+    return this.bus.readWord_p(this.address, cmd)
+  }
+
+  write2(cmd, bytes) {
+    return this.bus.writeWord_p(this.address, cmd, bytes)
+  }
+
+  // command with more than two bytes following
+  readBytes() {}
+  writeBytes() {}
+
+}
+
+module.exports = {
+  Device
+}