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刚接触arduino，我的需求是要用板子连接GPRS模块，模块的提供方说是TTL3.3V的，我想问一下，第0脚和第1脚的RX TX，是否可以直接接GPRS模块的TX，RX 看了官方网站上好像说是和USB共用的是5V，那如果我用3.3V TTL是不是就要用到其它串口了，例如
Serial1 ，Serial2，这些，在程序中怎么调用，是 Serial3.println这类用法么
下面是官网的关于TTL的解释，高人给指点指点啊。
The Arduino Due has three additional 3.3V TTL serial ports: Serial1 on pins 19 (RX) and 18 (TX); Serial2 on pins 17 (RX) and 16 (TX), Serial3 on pins 15 (RX) and 14 (TX). Pins 0 and 1 are also connected to the corresponding pins of the ATmega16U2 USB-to-TTL Serial chip, which is connected to the USB debug port. Additionally, there is a native USB-serial port on the SAM3X chip, SerialUSB'.
The Arduino Leonardo board uses Serial1 to communicate via TTL (5V) serial on pins 0 (RX) and 1 (TX). Serial is reserved for USB CDC |
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发表于 2015-5-26 14:58:43
楼主
