I have a Temp sensor connected to my arduino uno sending its data to the serial monitor e.g
16c
How can I send the data from the serial monitor to a local webserver so that i could access the temp from a internet browser?
In the setup I use with my arduino I am using NodeJS SerialPort module to listen to signals of my arduino with a motion sensor. To serve the signal data to the web in real time, I use the socket.io module for NodeJS. You can find quite a lot about this on the internet, for example this tutorial which is somewhat close to what I use.
http://www.codeproject.com/Articles/389676/Arduino-and-the-Web-using-NodeJS-and-SerialPort
Related
I'm new to Arduino.
I have 4 Arduino boards separated by long distance. I wanted to make connections between all of them so, for example if one sensor connected to Arduino board number 1 (for example) was triggered it will send to all other 3 boards some kind of notification to do action on other boards. I intended to use Ethernet shield but wondered what is the best mode to use when configuring Ethernet Shields with Arduino and how to configure them to do so . I hope you understand. Thank you in advance.
On Arduino with a networking shield you can start an EthernetServer or WiFiServer. See ChatServer example of the Ethernet library.
On other Arduino with a networking shield you create an EthernetClient (or WiFiClient) and connect it to IP address of the server. Then everything you print to client's Client will be send to server's Client returned by server.available().
You can test the server with a Telnet client.
I am trying to connect a WiFi module (ESP8266) to a "funduino" development board (Arduino Nano) but I have no success. Since I tried so much schematics I've found on the internet about the connection between them two, I kindly ask here if is anyone who succeed in "pairing" this two devices.
I am asking for the schematic and a functional source code.
Regards
The ESP-01 by default comes with nonOS SDK bootloader that communicated via AT commands, you can find the complete command set from Expressif here. This is designed for an MCU (like Arduino Nano) to use it purely as an WiFi module rather than using it as a stand-alone MCU (for which it will require NodeMCU SDK).
If you ever upload an Arduino sketch up to the ESP-01, it will erase the AT Command firmware.
Assuming your ESP-01 is still having the AT Command firmware. What #Ben provided is a sketch that allows you to type AT commands via the Serial Monitor to internact with the ESP-01, it is manual, and good for testing if ESP-01 is working (you type AT and press return on Serial Monitor, the ESP-01 will ack with Ok) but not practical as a real application. The minimum commands required to established an WiFi connection with ESP-01 is listed below.
AT+CIPMUX=1 - Enable single (0) or multiple connection (1) to the web server.
Multiple connection is a good option if you are repeatedly sending
out or reading data from the Internet.
AT+CWMODE=3 - Set WiFi mode: 1 is station mode (ESP8266 is client), 2 is AP mode
(ESP8266 acts like a WiFi router where your phone or PC can connect),
3 is AP+station mode (make the ESP8266 do both)
AT+CWJAP=“<your-ssid>”,”<your-pw>” - Connect to your WiFi. Provide your SSID name
and password inside the double qoutes.
AT+CIFSR - This returns the IP address of the module, indicating that it has
successfully connected to your WiFi router.
Once the WiFi connection is established, you can further communicate with the ESP-01 via the connection, like accessing a website for example:
AT+CIPSTART=0,"TCP", "www.example.com","80” - Start TCP or UDP connection. The
0 is the id of the connection.
AT+CIPSEND=0,16 - Command to tell the module data is ready to be sent. 0 is the
connection id, and 16 is the length of the data to be sent.
After this command, the ESP8266 will reply with the “>”
character to tell us that it will be waiting for the data to be
sent. If successful, the module will reply with “SEND OK”
GET / HTTP/1.1 - Send the http header, and other data, etc...
You can write your own sketch to automate those AT commands for interacting with with ESP-01 once you understand the AT commands required for establish a WiFi connection.
Here are two resources that I personally found extremely useful for doing more than connecting to WiFi.
STM32-ESP-01 Web Server - although this is for interfacing with STM32, the main difference is the pin assignment, so you should be able to port to Arduino easily.
MQTT via ESP-01
As for hardware interface, please noted that what #Ben provided is correct in principle, but you need to be aware that the ESP-01(ESP8266 to be precise) is a 3V3 MCU, so the connection is depended on what kind of host board you are using. If you are using Arduino Uno/Nano, both are having a 5V MCU, you will need a voltage divider (two resistors to drop the voltage to 3v3 before connecting to ESP-01) or a level shifter chip at least for the ESP-01 Rx pin to avoid the potential damage to the ESP-01.
how the bellow connection can be done , what the protocol that must be used to send bytes from computer through it's serial WiFi and receive the bytes in Arduino using ESP8266-01 WiFi Serial Transceiver Module.
computer AND esp8266 WITH arduino
It depends on what you want to accomplish, and what roles you want the computer and the arduino/esp combi to play. You can put the ESP in station or access point mode (or mixed), and have it talk to the arduino via the serial interface. The communication with the PC will indeed go via wifi/tcp protocol, but depending on your specific requirements you will have to decide one the roles. Then you can make the ESP a web client or a web server, mainly depending on the direction of the flow of information.
I assume you want to query the Arduino from the PC, in which you can send a HTTP/GET request from the PC to a simple web server on the ESP.
There are various examples in the Arduino examples that do just that to give you a start, available when you install the ESP library in the Arduino IDE, see: https://github.com/esp8266/Arduino
HTH
I am trying to send sensor data from an Arduino UNO to my server running on a local wifi network. My server is an HTTP server run on NodeJS.
I need the Arduino to send data to the server as fast as possible as fast as a request every 100~250ms. The code from the WiFiClientRepeating example sends data to the server properly every second or so. If I reduce the frequency to something lower or equal to 500ms, the server does not seem to receive anything.
Are there any limitations to how many requests there can be done in a set period of time?
EDIT: I am using the official Arduino WiFi Shield.
Is it possible to get sensor output from Arduino via Ethernet connection and to send data to Arduino via Ethernet?
So basically can "replace" serial port with Ethernet port?
The typical way to do this is with an Arduino Ethernet shield, a small hardware module that plugs into your Arduino board:
http://arduino.cc/en/Main/ArduinoEthernetShield
Updated:
One very common approach for client to server communication would be to use HTTP over TCP/IP. See this example on the Ardunio site of a simple client on an Ardunio connecting with a server (in this case google):
http://arduino.cc/en/Tutorial/WebClient
For your use case you can simply create your own server and modify the example to send data to it.
Alternatively you can skip the HTTP part and just use sockets - there is an open source example here:
https://github.com/billroy/socket.io-arduino-client