The ArduinoIDE writes firmware to my Arduino UNO but I want to handle logic and code outside the microcontroller on the computer with the microcontroller strictly being a sensor and the computer handling the logic.
How can I have the computer handle the logic and listen to sensors (output data to a computer) and respond (input commands to the board)?
Is this done with serials? How do I get started with this?
I know how to code, I just need help understanding how to get the hardware to talk to one another. Arduino to computer, computer to arduino.
For example, I have a thermal sensor on the board, how can I have bi-directional communication where the output of temperature would go to a program on my computer and respond to the board to turn on an LED or other command based on statements on the computer.
All help is appreciated.
There is a tutorial on arduino.cc how to read a sensor on arduino en display the values in processing.
There is also a tutorial to turn on a led with a command from a pc.
If you want to do real complicated things I suggest that you take a look at Firmata
Related
I am using ESP8266 (NODEMCU 3.0 or something) to make a quadcopter. Ive connected ardu pro mini to RC receiver so I am reading PPM values from it. Pro mini sends data with tx to ESP8266. ESP reads it with software serial with 115200 baudrate. I am communicating with MPU9255 (Waveshire) via I2C either.
My problem is that I cant fully controll my brushless motors. When I was using arduino instead of ESP8266, servo library was the best and reliable. But ESP's servo library is different, since its not AVR, and problems occurs. First of the servo library didnt want to work on most frequencies. I mean default is 50Hz (20000uS) and in this state ESC of motors did armed but unfortunatelly when changes was fast and short (1250-> 1370 -> 1250) it did miss that change like nothing happnd... This makes my D value in PID controller useless...
Sometimes on 100Hz freq all was working fine, but sometimes not...
When Ive started to use analogWrite only 500Hz was working fine, rest of freq didnt want to arm ESCs.
PS. I am using 3.3V to 5V converter for PPM/PWM pins so I am sure that the signal is fine for ESCs.
PS2. I dont have any osciloscope unfortunately.
The ESP82266 present on your module is a RF transceiver integrated circuit that can handle WiFi communication, both configured as a slave to a microcontroller such as the ones present on various Arduino boards, or as a standalone chip by having it's on-board Tensilica L106 32-bit processor programmed via an external SPI flash memory. If used as a slave, the communication between, for example, an Arduino an the ESP82266 can be done using different protocols such as SPI / SDIO or I2C / UART interfaces. Googling a comprehensive Tensilica L106 user guide on the internet doesn't seem an easy task, and it looks as if some people have already failed to find it. If you're seeking to add Wi-Fi capabilities to your quadcopter the solution I suggest is having the Arduino take control over the servos, motors, etc. and hand off messages via SPI to your ESP82266 module. If this isn't the answer you are looking for, please try to be clearer about it, maybe find someone to do as an English translator for you.
However, if this is what you're concerned about, and you would like to use the ESP82266 module as as standalone solution, please link its built-in processor datasheet and the relevant parts of the quadcopters code that might need debugging.
I would like to use the Arduino sensor in raspberry pi.
Since the sample file for the sensor is dedicated to the Arduino, the example header file is also dedicated to Arduino.
The example code uses the spi.h file. Can I download the header file and use it in Raspberry Pi?
That wouldn't make sense for various reasons and it wouldn't work for various reasons.
SPI is a serial interface. You don't need Arudino code to communicate via SPI on Raspberry PI. There are many examples on how to do that on Raspberry PI.
The sensor doesn't need an arduino. All it needs is power and someone to talk to.
The fact that you ask this question shows that you should invest time into learning C/C++ and get some basic knowledge about microcontrollers and serial interfaces.
If you're lost in an unknown jungle it won't help you to bring a map from another unknown jungle... So what do you have to do? Learn about jungles in general and some day you'll be able to survive in most of them.
I am using 2 esp8266 wireless modules to establish bidirectional wireless communication between 2 arduino boards (one mega and one uno) without the use of any earth based technologies (i.e. radio frequencies, wifi which relies on earth sattelites, etc.). My solution was to use the esp8266 to establish a private area network with both esp's acting as a station and an access point (AT+CIPMODE=3). Unfortunately, this solution has proven to be more of a hassle than it was worth.
To start, I have the esp's each wired according to this diagram
When I first started out, the red LED was on and the blue LED was off. During this time, I was able to send AT commands, establish the server, and achieve the communication I required by entering commands directly to the serial monitor. After this, I started writing a library using the SoftwareSerial library to allow me to issue commands directly through the program to set up the esp as needed upon start up of my script. Before doing this, I changed the baudrate to make sure it was running at 9600, and entered the AT commands in the serial monitor to make sure everything was working properly and it still worked.
After I began writing the library, before uploading the code with a test of the library I noticed the blue LED was lit solid now. Noticing this, I reuploaded the barebones script (I haven't uploaded the library code to the arduino yet) and the esp was no longer receiving the AT commands.
Does this indicate an issue with the board which I can fix or does this mean the board is done?
With my deadlines approaching fast in about 3 weeks it is crucial I get this wireless communication working so if this is an issue with the board, I'm going to have to scrap the esp's and use a different way of communicating. So my second question is, if this is the case, what are other viable options for establishing this communication? I have used xbee's before and while that would be ideal, they fall out of the budget I have been alotted so I need to keep it under $50 for this. If bidirectional communication is not possible for that price I can live with one way because I just need to get this system working. Basically I just need to transmit a single byte of data.
I realize this response is a little belated, and I hope you got it sorted: I've started working with the ESP8266 myself in the last few weeks, and hence why I was looking around for tutorials on direct communication between 2 units, when I found your post.
From what I've been able to ascertain, the AT commands are a part of the 'firmware' which ships with some modules. The Arduino code however starts loading onto the chips at memory address 0x0000, which is the same address that the firmware update tools use.
In other words, I believe that with the Arduino-coded program running on there, you lose the AT command functionality.
If you find a firmware update tool for the ESP8266 (plenty online) you'll get back the AT commands.
I suppose though the real question is why would you want to? It seems that the AT commands are just a way to treat the ESP as a dumb WiFi antenna. With the Arduino code, you're actually treating it as a micro-controller in its own right.
I am using arduino uno r3 board and arduino 1.6.5 on windows 8. When Itried to upload my program on ATMEGA328 microcontroller it is showing:
avrdude:stk500_getsync not in sync:resp=0x87.
help me to solve this error
This boils down to 3 problems usually..
The bootload on the chip is missing (unlikely if you purchased the board from Arduino).
The serial connection between the arduino and the computer is disconnected or interrupted.
You've simply selected the wrong board type or port when programming, and thus the IDE is searching for a signal that the arduino isn't coming back with.
This problem is most likely due to option 3, however it can occur in odd situations especially on the Arduino Micro where the board does all USB comms on chip and can be flooded by main without an appropriate delay to the point it can't communicate with the IDE. However this is just most likely a bad board selection or a bad port selection.
I've tried many things but this worked for me. If you have a working Arduino lying around (in my case Uno) you can use it as an intermediate in-system programmer (ISP).
Follow this guide to first load the ISP sketch into your working Arduino.
Once you are done, for your non-working Arduino, select from the Tools > Programmer menu and choose Arduino as ISP, and set Board and Processor accordingly. To program choose Sketch > Upload using programmer.
Hope this works.
I think the reason that this work is that it will bypass the CH340/FTDI chip, and all those synchronization issue. Given that that is your problem.
How can I send a string via serial communications from Java or Python? I have a very little arduino program that will recieve a CSV string of ints that each control different relays (I adapted it from their example).
I just got an Arduino, and I am trying to use it to open and close a relay remotely. I have it opening and closing the relay, no problem. But I really have no idea where to start as far as using serial communication.
I have a bluetooth dongle that I can connect to, but once I do that I'm lost.
Also, this is my first time using serial communications AND my first time using an Arduino. So I'm sorry if I am completely off on some of the things I am asking. All I know is what I've learned from Google.
Thank you very much
You can use any Java or Python serial port classes and methods. There is however one thing you need to be aware of.
The newer arduino's have a feature known as AutoReset. This works by connecting the DTR signal from the serial port to the Reset line on the chip using a capacitor or such. The IDE uses this to reset the board to activate the bootloader and initiate uploading code to the arduino. The serial monitor in the IDE is aware of this and does not toggle the DTR line when comunicating with the device (except when it initially connects).
There is are several ways to defeat this feature and you can read about them here.
As for actually comunicating with the device, there are several tutorials about serial communication in both Java and Python.
Pyserial includes the option to not use the DTR lines when opening a port.
Here is a website explaining how to use RXTX (a Java library) to comunicate with an Arduino
Best of luck.