Hans Lemurson Explains: The D Flip-Flop. The D-Flip-Flop, or "Data" Flip-Flop is the fundamental unit of computer memory systems. It is a device which lets you automatically store values in a place where they can be accessed later. The "Flip-Flop" part of its name refers to how the memory cell at its core can switch between two different stable states, much like a flat rock that gets flipped over (only without the rock). "Data Flip-Flop" can be abbreviated to "DFF" for ease of typing. Have fun. Www.lynxmotion.com/images/html/build125.htm. Arduino - JY-MCU Bluetooth. A while back I got a package from Dealextreme with a JY-MCU Arduino Bluetooth Wireless Serial Port Module. This bluetooth device is both cheap and easy to use, and I will now show you how to get it up and running. Later on I will show you how to wirelessly control your lamps using your computer or android device.Specifications Dimensions: 4.4 cm x 1.6 cm x 0.7 cm (1.73 in x 0.63 in x 0.28 in) Weight: 7g (0.25 oz) Range: ~10 m (~33 ft) Supply voltage: 3.6-6V BT-Name: linvor BT-Pin: 1234 BT-Baudrate: 9600bps (standard) Before connecting it to your Arduino Before you hook it up to your Arduino, you should upload your the code you want to use.
This is because your bluetooth device will be connected to both the RX and the TX pin of your Arduino, and while it is connected, you will not be able to upload new code using USB. Here is the code I used, I got it from arduino.cc. Wiring it all up.