Dangerous Prototypes Open Source Hardware

The JeeLink is a fully assembled and ready-to-use USB-type “stick” which plugs directly into a PC or USB hub. It contains Atmel’s ATmega328p AVR microprocessor and HopeRF’s RFM12B wireless radio module. The processor chip is pre-flashed with the Arduino boot loader and the RF12demo sketch.

Unlike JeeNodes, JeeLinks do not have any external ports to connect plugs and other components to. The JeeLink comes in a clear plastic case and is intended as interface between other JeeNodes and JeeLinks (via wireless) and an attached PC or Mac (via USB).

The site http://wtfmoogle.com/?p=1508 has a series of claim the we would like to respond to before the FUD spreads too much.

This is a super long range 433mhz RF link kit Comes with VCO , PLL technology, steady Frequency and super anti-jamming ability. You can directly use it with your project like wireless data transport and remote control etc…

Sick of trying to figure out which pins are used by some obscure Arduino shield? Can't tell whether two shields will be compatible with each other?

First , put the BT shield stand on Arduino board – the BT shield has a serial port Bluetooth module (Slave) on it. The BT shield have 3 pins connect with Arduino board : State , RX and TX. With the State LED and State pin, we can get the connection status of the BT shield , when the Bluetooth serial port channel is not build , the State LED will alternating light and off , and if the serial port is opened , the State LED will be on. The State pin will be the same mode as the LED .

Here we make a example how to use the Arduino with the Bluetooth module to send data to PC.

In this code , we use the interrupt to check the State pin, if the state pin level from high to low , then we consider that the module still in the standby mode, so wait for connecting. If the State pin maintain more than one second of high level, we consider that the Bluetooth channel has build and we can sent the data to serial port.

Now we have a demo show how to use the Arduino controlling the nRF24L01 module , and you need two Arduino boards and two modules, one to transmit and the other receive. The connection of two part is the same but the different software.

The nRF24L01 module is worked at 3V voltage level , so the Arduino 5V pins may destroy it , so we need to add some resister to protect the module – using the 10K and the 15K resister to reduce the voltage is a usual method.

Connect the module pins to Arduino as below:

CS - D8 , CSN – D9 , SCK – D10 , MOSI – D11 , MISO – D12 , IRQ – D13