This is a serial Bluetooth 4.0 BLE for Arduino, Nano, Mega app for use only with cc2541 (BLE-HM-10). It can be used to control LED, Relay switch or any other I/O on/off single pin controlled part. This is preset to use pin 13 (D13) when using my HM-10 sketch at fatbeard.com for your IoT.
TX to RX and RX to TX connection.
It is also precoded for UUID ffe0 and ffe1 and preset for
Device = HMSoft (only cc2541 BLE HM-10.) Must use sketch from FatBeard.com
Now includes Pulse feature!