Arduino
input voltage: 7-12V
current usage: 18-25 mA
can supply
per I/O Pin 40mA
for 3.3 volt supply 50mA
Xbee:
TX Current 265mA (@3.3V)
RX Current 65mA (@3.3V)
Power-down current: 45uA
LCD (4.75V to 5.25V):
Logic: 35-42mA
Logic and backlights: 129-161mA
Logic and LEDs 147 mA 175 mA
Logic, backlights, and
LED: 239-290mA
FTDI (5V input)
running 25mA
standby 2mA
9V battery 500 mAh
maximum power draw nominal power draw
Arduino 25 mA Arduino 25 mA
Xbee 265 mA Xbee 82.5 mA
LCD 290 mA LCD 161 mA
FTDI 25 mA FTDI 25 mA
605 mA 293.5 mA
minimum battery life nominal battery life
0.83 hours 1.70 hours
50 minutes 102 minutes