http://bbs.arduino.tw/viewthread.php?tid=17
Arduino的第一個blinking Led範例直接將LED接在DIGITAL OUT的PIN上,當作高電位使用。
根據ATMEL 公布的ATmega168 SPEC,晶片最佳工作狀況如下
Microcontroller ATmega168
Operating Voltage 5V
Input Voltage (recommended) 7-12V
Input Voltage (limits) 6-20V
Digital I/O Pins 14 (of which 6 provide PWM output)
Analog Input Pins 6
DC Current per I/O Pin 40 mA
DC Current for 3.3V Pin 50 mA
Flash Memory 16 KB (ATmega168) or 32 KB (ATmega328) of which 2 KB used by bootloader
SRAM 1 KB (ATmega168) or 2 KB (ATmega328)
EEPROM 512 bytes (ATmega168) or 1 KB (ATmega328)
Clock Speed 16 MHz
顧及以後您的設計會越來越龐大,如果需要驅動多顆LED請使用以下電路圖,以電晶體接收DIGITAL PIN訊號當作開關,LED的電壓請從VCC提供。
好的電路勿把digital Pin當作電壓使用
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