Waspmote Prototype Sensor Board
The Waspmote Prototyping Board 2.0 has been designed to make it as easy as possible for you to integrate any type of sensor on your Waspmote main board. With this aim in mind, the prototyping board has been endowed with the following features:
- A 16-bit analog-to-digital converter (ADC) which provides up to a 68µV resolution in a range of 0V to 4.5V for a differential input
- An area of independent pads where pins, cables, passives or DIP-encapsulated integrated circuits can be soldered.
- An area for SMD-encapsulated integrated circuits upon which various circuits or sockets with different sizes can be mounted.
Prototyping Area The prototyping area included within the board is divided into two regions: the pads area and the integrated circuits area.
The pads area is a matrix of 16×8 pads of 1mm diameter whose aim is to fit discrete components such as resistors, capacitors or DIP-encapsulated integrated circuits. The metallized area of each pad is of a larger size to facilitate both soldering the components to the pads and soldering pads to each other. On the upper part and the lower part of the matrix there are strips of pads that provide an output to all the mote's signals in the sensors' connectors. Finally a series of pads are included that connect to the 3.3V supply, the 5V supply and to ground.
The integrated circuits area has seven footprints for SMD integrated circuits of different sizes: One 20-pin SO type, one 24-pin TSSOP, one 10-pin micro-SOIC, two 6-pin SOT-23, and two 6-pin SC-70. Output is given to each of the footprint ports through a 1mm diameter pad, from which you have access to the circuit.
Analog-to-Digital Converter The Waspmote microprocessor incorporates a 10-bit analog-to-digital converter which can be used through any of the analog inputs within the main 2×11-pin connector. In the event of any application requiring a higher resolution, a 16-bit Sigma-Delta (ΣΔ) analog-to-digital converter has been added to this prototyping board, with a maximum conversion time of 23ms (Linear model LTC2453).
Communication with this device is carried out through I2C, allowing a differential reading between its input IN+ and IN- (see the Technical Guide's section API about the board libraries for information on the necessary commands for communication). Each of the inputs accepts a range of voltage between 0V and 4.5V, therefore allowing a differential measurement between -4.5V and 4.5V. To obtain a more precise reading, the reference voltage for the conversion is fixed by a voltage reference of 4.5V, model MAX6107.
Download the Waspmote Prototyping Sensor Board 2.0 Technical Guide for more details.