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DIGITAL WORKS 3.04 SERIAL SERIAL
On the plus side, this also happens to be a convenient way to pass large values between two Arduinos over a two-wire Rx/Tx serial connection, or between the Arduino and a custom program on the PC. The USB serial communication device can be an Arduino Uno board, a standalone USB Serial board, or an AVR programmer like the Reactor Core 3-in-1 programmer. In practice this means getting the power from the USB serial communication device. So that's why the first byte the TouchShield gets is shifted left by 8 bits. In testing, I found that the serial communication works only with a common power and ground. Which it then grabs only the lower 8 bits of:īecause I send highByte first, and the send lowByte, that means the TouchShield has to know that the first thing it gets will be the highByte. It then shifts val to the right by 8 bits to get: I throw a delay(1) in between just to give the Arduino and TouchShield time to separate the two sends from each other.
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Then, it prints the high byte, followed by the low byte. Then, it sets highByte to the upper or leftmost 8 bits (by bitshifting it down 8 bits first). First it take val, and sets lowByte to only the lower or rightmost 8 bits.
DIGITAL WORKS 3.04 SERIAL HOW TO
Chris figured out how to get this working in the Pin Visualizer project, and I've adapted it for the Processing graphics library code too. So in order to send a full int from the arduino, you have to send each byte of the 2-byte integer separately, and then reconstruct it back into the full two-byte value. The catch is that integers (ints) are 2 bytes long, so if you try to just use serial.print() and serial.read(), it only sends one byte, or 8 bits, and then you lose the other part of your number! It's easy to pass unsigned chars one at a time, because the serial.read() function grabs one char at a time, which is one byte.
DIGITAL WORKS 3.04 SERIAL MANUAL
it's a slightly modified version of what I posted on the forum.)Ĭommunicating from the Arduino to the TouchShield is a bit of a manual process, largely because there are so many different ways someone might want to communicate that it's tough to plan for all of them ahead of time. The catch is that integers (ints) are 2 bytes long, so if you try to just use serial.print() and serial.read(), it only sends one byte, or 8 bits, and then you lose the other part of your number So in order to send a full int from the arduino, you have to send each byte of the 2-byte integer separately, and then reconstruct it back into the. (I've gotten a couple of questions about this, especially since I posted the Processing on a TouchShield post, so here's a little tutorial on how to pass large values, like integers between the Arduino and TouchShield.