Proposal - start [kondor.etf.rs]

• Multiple sensors, of which the major one is MC-MEMS, which is a major
contribution of this project.
• The units (one or more) responsible for the communications with the external world,
including WSN, mobile telephony, the Internet, etc. will be used to limit the weight
of the board. The communications interfaces will be limited to one or two and again,
for reason of space, the BGA SoM (System on Module) will be used. For example,
Meshnetics is providing a module weighing 1.3g working on the European ISM Band
from 863 to 870 MHz, consuming 26mA with a 128 kBytes of on-Chip Flash
Memory, 8 kBytes On-Chip RAM; all of a size 18.8 x 13.5 x 2.8 mm; the I/O of the
Meshnetics module includes SPI, I2C, 1-wire, UART with CTS/RTS control, JTAG,
9 spare GPIOs (up to 25 GPIOs total), 2 spare IRQ lines, 4 ADC lines; this makes the
module almost independent and it might be possible - depending on the computation
load - to have the microcontroller of the module take over the functions of the
processing unit. Similar modules are offered by Meshnetics for the 2.4 GHz band.
Another example for a wider range wireless connectivity is the Telit BGA GPRS
module whose size is 22x22x3mm, which must be carefully considered - as all long
range communications solutions - as far as the power consumption is concerned.
• A final example, having in mind the energy consideration, is the application of a
passive low frequency (134.2 kHz) device with EEPROM and transponder interface,
the TI TMS37157. If we consider an application of a sensor with a data logger, the
microcontroller is connected to a battery and can wake the TMS37157 to write data
into the EEPROM of the TMS37157. The data can be read out through the LF
Interface of the TMS37157. This application may also be used for powering the µC
out of the RF Field if a battery is not an applicable solution. The battery has to be
replaced by a big enough capacitor which is used as a buffer during the LF
communication.
• Last but not least important building block is the battery; the most likely technology
to be used is the Lithium Polymer, for its adaptability as far as shapes are concerned.
The gravimetric capacity for common LiMn2O4 cathode providing 3.7 V is about
140mAh/g. An actual battery (which takes into account packaging, etc.) is the Varta
LPP 402934 E, whose dimensions are 34x30x4mm with a capacity of 330mAh and a
weight of 8g. Depending on the power consumption of the system an interesting
alternative is the flexible ultra thin battery Varta LFP 25 which offers a capacity of 25
mAh in 29 x 22 x 0.44 mm casing but is not rechargeable.
The first goal of integrating the system, into a board sufficiently small to be used for the vast
majority of the use cases, is to be able to explore the architectural design space limiting the
capital and human resources needed. The second step is to put as much as possible into a
system-on-the-chip, maybe using the flip chip technology, and get the highest miniaturization.
Appendix 3: Concept Modelling Details
The major purpose of the concept modelling software is to analyze input data, extract
concepts to be used in data mining (to implement an expert assistant), and for semantic web