Arduino

KuoiGuaBoarder

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Pulse Width Modulation

PWM, is a technique for getting analog results with digital means. Digital control is used to create a square wave, a signal switched between on and off. This on-off pattern can simulate voltages in between full on (5 Volts) and off (0 Volts) by changing the portion of the time the signal spends on versus the time that the signal spends off. The duration of "on time" is called the pulse width. To get varying analog values, you change, or modulate, that pulse width. If you repeat this on-off pattern fast enough with an LED for example, the result is as if the signal is a steady voltage between 0 and 5v controlling the brightness of the LED.


http://arduino.cc/en/Tutorial/PWM


deep dig

KuoiGuaBoarder

http://www.robot-electronics.co.uk/acatalog/I2C_Tutorial.html

KuoiGuaBoarder

KuoiGuaBoarder 发表于 2014-4-27 13:46
http://www.robot-electronics.co.uk/acatalog/I2C_Tutorial.html

The SDA and SCL lines enable i2c communication.

Which pins are SDA and SCL?
Uno, Ethernet: A4 (SDA), A5 (SCL)
Mega2560: 20 (SDA), 21 (SCL)
Leonardo: 2 (SDA), 3 (SCL)
Due: 20 (SDA), 21 (SCL), SDA1, SCL1

luvski

你要干哈？

KuoiGuaBoarder

luvski 发表于 2014-4-27 15:32
你要干哈？

找个 大宝意 来指导一下工作

KuoiGuaBoarder

KuoiGuaBoarder

哪位大侠能出手给解释一下：
Bus scheme VS  key matrix

KuoiGuaBoarder

请教一个问题:

encoder vs potentiometer 区别在那里?

KuoiGuaBoarder

KuoiGuaBoarder 发表于 2014-5-6 22:03
请教一个问题:

encoder vs potentiometer 区别在那里?

同雪网就是牛， 象个愿望树一样，只要写下来马上就知道答案了