A Study on the Effects of Heavy Backpack and Development of a Preventative Prototype

Table 5

Arduino Uno technical specifications.

Microcontroller	atmega328p
Operating voltage	5 v
Input voltage (recommended)	7–12 v
Input voltage (limit)	6–20 v
Digital i/o pins	14 (of which 6 provide PWM output)
PWM digital i/o pins	6
Analogue input pins	6
Dc current per i/o pin	20 ma
Dc current for 3.3 v pin	50 ma
Flash memory	32 kb (atmega328p) of which 0.5 kb is used by bootloader
SRAM	2 kb (atmega328p)
EEPROM	1 kb (atmega328p)
Clock speed	16 MHz
Length	68.6 mm
Width	53.4 mm
Weight	25 g