Datasheet

Jon Waddington
71
5.4 Further Work
To save battery life in the remote temperature sensor, the XBEE could be interrupt
driven, so that while the temperature is not needed, the remote XBEE can go into sleep
mode. When the “Temperature” item is displayed, the remote XBEE can be woken up by
the coordinator and begin sampling and transmitting the temperature.
Further work could include adding internet facilities. This could be used as an alternative
method of checking the outside temperature. It could do this by retrieving the local
weather based on a postcode entered by the user. It could also give the weather in more
detail, by retrieving the maximum and minimum temperature of the day, the wind speed
and the weather. This would reduce the cost of manufacturing the Information System
by removing the need for the two XBEE modules, but an internet service would be
required.
The internet could also be used for reading the latest news or sending and receiving
emails. This would ensure that the user does not feel isolated by easily keeping in touch
with friends and family.
Item
Price
Quantity
Net
Cost
Source
Propeller IC
£5.90
1
£5.90
http://www.active-robots.com/products/parallax/propeller-chip-40-pin-dip.shtml
24LC256
£1.48
1
£1.48
http://uk.farnell.com/microchip/24lc256-e-sn/eeprom-256k-i2c-2-5v-soic8/dp/1579573
AC Adapter
£6.26
1
£6.26
http://uk.farnell.com/stontronics/ad-05100rbs2-1/adaptor-5vdc-1a-uk/dp/1279510
XBEE 10 pin headers
£0.30
4
£1.20
http://proto-pic.co.uk/products/2mm-10-Pin-Xbee-Socket.html
XBEE
£22.21
2
£44.42
http://uk.farnell.com/digi-international/xb24-buit-004/module-zigbee-xbee-znet-2-5-
1mw/dp/1546392
MCP9700A
£0.34
1
£0.34
http://uk.farnell.com/microchip/mcp9700a-e-to/thermistor-linear-10mv-c-to-92/dp/1332164
DS18B20
£3.27
1
£3.27
http://uk.farnell.com/maxim-integrated-products/ds18b20/programmable-digital-t-mom-
18b20/dp/1187948
GP1UX301QS
£0.93
1
£0.93
http://uk.farnell.com/sharp/gp1ux301qs/photodiode-ir-detector/dp/1243866
MAX3232
£3.24
1
£3.24
http://uk.farnell.com/maxim-integrated-products/max3232cpe/transceiver-3232-dip16/dp/9724494
LD1117V33
£0.78
2
£1.56
http://uk.farnell.com/stmicroelectronics/ld1117v33/v-reg-ldo-3-3v-1117-to-220-3/dp/9755837
PCF8563
£1.52
1
£1.52
http://uk.farnell.com/nxp/pcf8563p-f4-112/rtc-calendar-8563-dip8/dp/8906122
coin cell holder
£0.69
1
£0.69
http://uk.farnell.com/keystone/1066/battery-holder/dp/1020673
CR2032
£0.77
1
£0.77
http://uk.farnell.com/renata/cr-2032-mfr-1bl/cell-button-3v/dp/1823479
4xAA battery holder
£1.34
1
£1.34
http://uk.farnell.com/keystone/2477/battery-holder-pcb/dp/1650684
CM12 X10
£33.91
1
£33.91
http://www.uk-automation.co.uk/x10-computer-interface-serial-usb-cm1112-p-997.html
Remote control
£4.04
1
£4.04
http://www.shoppingbank.com/sb/pia/d/giant+universal+remote/pid/8570523/?afid=105749
Total
£110.87