arduino | 易学教程

How do I reset my Arduino Mega2560 with my C# application?

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问题 I noticed the Arduino IDE automatically resets on startup/exit by the built in serial application due to one of the hardware flow control lines (DTR) of the FT232RL is connected to the reset line of the ATmega1280 via a 100 nanofarad capacitor. When this line is asserted (taken low), the reset line drops long enough to reset the chip. I noticed that behaviour does not happen with my serial C# application. I would like the reset feature to work with my C# application. What am I not doing to

Serial communication (for Arduino) using Visual Studio 2008 and C

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问题 I want to send data to my Arduino board using Visual Studio and C. I specifically need to use C since I am using ARToolKit to get markers and sending the data accordingly. I was trying the code #include<stdio.h> #include<stdlib.h> void main() { system( "MODE COM9: BAUD=9600 PARITY=n DATA=8 STOP=1" ) ; FILE port = fopen( "COM9:", "wb" ) ; printf("hello"); fprintf( port, "s" ) ; fclose( port ) ; } but it is not getting compiled. I just need to send data. 回答1: I understood from your post that

Arduino making decision according to a packet received from serial port

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问题 The program listen to messages from serial port in the form or where first character (A or D) means analog or digital, the 2nd character - pin, the 3rd character - 1/0 or from 0 to 255. The markers < and > show the beginning and the end of packet. For example, if packet is received, the light is turned on by digitalWrite(13,1) But nothing happens. When I send via serial monitor, for instance: light is supposed to blink but it does not. The same with analogue outputs. bool started = false;

Split string by delimiter strtok weird behaviour

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问题 I am trying to split string ,but unfortunately strtok behaves weirdly I have following string get|user=password|23|info|hello I have tried widely used method using strtok, but unfortunately it treats = as delimiter and I cannot parse my string. So get parsed correctly than parsed only user , but not user=password . Please help to find the problem or suggest any other way to split the string. I am programming for Arduino. Thanks Code const char delimeter = '|'; char *token; token = strtok

Input process and type for static uint8_t array

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问题 I am currently trying to convert an integer variable to the value of a static uint8_t array in the Arduino IDE. I am using: #include <U8x8lib.h> And I do understand that uint8_t acts similarly to the byte type. Currently, the array has a set value: static uint8_t hello[] = "world"; From my perspective, "world" looks like a string, so I thought I would start with creating a string variable: String world = "world"; static uint8_t hello[] = world; This did not work and gave me the error:

Arduino学习笔记② Arduino语言基础

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What is Nak Limit?

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问题 Am trying to understand how the Android Open Accessory API works with the Arduino ADK board, I've been able send and receive information but I just want to know how everything works. I got to this function description: int AndroidAccessory::read(void *buff, int len, unsigned int nakLimit) { return usb.newInTransfer(1, in, len, (char *)buff, nakLimit); } From some googling I figured that NAK is some code that gets sent if something went wrong during the handshake, so is NAK limit the number of

What is Nak Limit?

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Convert binary string into decimal

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问题 I would like to convert a string that is a binary to a decimal. Here is what the fullCard value is. fullCard = "1000000100000101111101" Here is what it should look like after being converted to decimal fullCardInt = 2113917 Main.ino String fullCard; // binary value full card number int fullCardInt = bin2dec(const_cast<char*>(fullCard.c_str())); // I get -1 which is a failure. serial.print(fullCardInt); int bin2dec(const char *bin) { int result=0; for(;*bin;bin++) { if((*bin!='0')&&(*bin!='1')

How can I receive simple integer values over bluetooth in ios

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问题 I am trying to learn how to get some sensors plugged into an Arduino board to talk to an iPhone over Bluetooth with a Red Bear Labs mini board but have hit a brick wall. The sensors get a reading and this is sent to the phone over BLE. So far I've connected to the device and I get back what appears to be data but I can't make sense of it. I've written a little sketch that looks like this, to simulate the sensor data. #include <SoftwareSerial.h> SoftwareSerial bluetooth(5, 6); void setup() {