The blue bean is ok. They are good beginner things - Depends on what you want to do. I usually use this for everything - https://www.adafruit.com/product/2479
because you can just connect it to an arduino and anything you send over the arduino serial (Serial.print("h") for instance) will be transmitted via bluetooth.
Bluetooth will transmit byte data - not pules. It's basically like a wireless UART serial (the serial you see on arduino) - So when you sense something with the reed/hall sensor you will then send something to the phone indicating that. It is up to you to write the app on the phone that will interpret what you sent over. So if you sens something and you send the character "h" you would then make an app that looks for the character "h" over bluetooth.
Is this android or iOS? Do you have any phone development experience?
I want to build a simple device to sense the position of a valve via a magnet and reed switch or hall effect and send a digital pulse via Bluetooth to a smart phone or tablet. The max pulse frequency would be 50 ms but more often around 100 ms.
I've had a play with the TI CC2650 Sensor Tag which gives me a signal but its too big and chunky with a whole lot of sensors I don't need (i know its only a dev kit). I'm now looking at the DFR Blue Bean (Bluno) which is closer to the mark for prototyping and I can solder on a switch. http://www.dfrobot.com/index.php?route=product/product&keyword=light%20blue&product_id=1426#.V4Qio0Z94UE
Any advice is appreciated.
Am I heading down the right path or is there something simpler available?