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wsn:scatterweb:esb

Embedded Sensor Board (ESB)

esb.jpg

  • Mikrocontroller TI MSP430F149
  • Radio Communication TR1001

Pin Assignment

Power supply

ESB nodes have a power regulator (MIC5201-3V) providing a constant internal voltage of 3V. The input voltage provided by the batteries need to be “a bit higher”. Measurements with node 13 showed that 3,14V is required at minimum (measured with the FUB's standards userproc using a current of 11mA). Having a lower input voltage the internal voltage decreases. The transmitter needs at least 2.7V (according to its specification). The processor can run with an even lower voltage. Measurements have shown that it crashes at an input voltage of 2,1V - 2,25V (with standard userproc + serial connection, current: 16mA).

Input voltage Internal voltage
> 3,14V 3,00V
3,00V 2,90V
2,91V 2,80V
2,81V 2,70V
2,71V 2,60V

Nodes can measure their input voltage (e.g. Command “rvb”). The unit of the value returned is not documented. The table gives some approximate measurements. For input voltages < 3,25V Values from 1940 - 2000 have been returned. Values have been measured with node 13 with FUB's standards userproc and serial connection (current: 16mA).

Input voltage Value returned by rvb
4,50V 2560
4,25V 2460
4,00V 2350
3,75V 2230
3,50V 2111
< 3,25V around 1970

Power consumption

ESB node 24 powered with approximatly 3.8V. Then the same measurement was used for measure the current. All sensors were turned on (default). In test 1 only the the value was changed. In test 2 pin for transmitter was always on without the complete transmit module (program rxstrength2 command “rxb”). Transmit module was turned off with Net_off() in test 2.

transmission value test 1 test 2
0 15.1 mA 10.66 mA
5 15.1 mA 12.51 mA
10 15.1 mA 12.53 mA
15 15.2 mA 12.60 mA
20 15.3 mA 12.68 mA
25 15.4 mA 12.75 mA
30 15.5 mA 12.82 mA
35 15.6 mA 12.90 mA
40 15.6 mA 12.98 mA
42 15.7 mA 13.00 mA
45 15.8 mA 13.05 mA
50 15.8 mA 13.15 mA
55 15.9 mA 13.25 mA
60 16.0 mA 13.38 mA
62 16.1 mA 13.42 mA
65 16.2 mA 13.52 mA
67 16.3 mA 13.59 mA
70 16.4 mA 13.71 mA
72 16.5 mA 13.79 mA
75 16.6 mA 13.95 mA
77 16.7 mA 14.07 mA
78 16.8 mA 14.15 mA
79 16.9 mA 14.21 mA
80 16.9 mA 14.28 mA
81 17.0 mA 14.37 mA
82 17.1 mA 14.46 mA
83 17.2 mA 14.56 mA
84 17.3 mA 14.66 mA
85 17.4 mA 14.78 mA
86 17.6 mA 14.91 mA
87 17.7 mA 15.06 mA
88 17.9 mA 15.22 mA
89 18.1 mA 15.39 mA
90 18.2 mA 15.60 mA
91 18.5 mA 15.84 mA
92 18.8 mA 16.10 mA
93 19.1 mA 16.43 mA
94 19.4 mA 16.81 mA
95 19.8 mA 17.26 mA
96 20.3 mA 17.81 mA
97 21.0 mA 18.51 mA
98 21.9 mA 19.44 mA
99 23.0 mA 20.5 mA

Flash Cable

Flash cables can be ordered at elektronikladen.de. For details see their page for the MSP430 JTAG Adapter or MSP430 JTAG USB Adapter.

Information how to use the MSP430-JTAG-TINY adapter from Olimex can be found in this introduction.

Serial Cable

Serial cables have to be crafted oneselfes. Material can for instance be bought at Conrad Electronic. Required material:

Name Conrad article number Conrad Price (2004 Catalog) 2004 Catalog Page
Sub-D Plug 9 pins (female) 711373-50 Euro 2,10 1100
“Pfosten” plug 2×5 pins 702013-50 Euro 0,73 1102
Flat cable 10 pins 609390-50 Euro 0,73/meter 945
wsn/scatterweb/esb.txt · Last modified: 2012/11/08 14:14 (external edit)