hey, is there a known way(relatively low cost) to use a raspberry pi as webserver to trigger commands on Arduino?? if there is a way to do it with an Arduino alone that would be great but I don't think that is possible
my final product should be a web page with an on and off button(s) that triggers the movement of servos.
I have a working project that works on infrared so it would be great if on the Arduino side I could just change the code to use the output from the raspberry pi instead of writing new code but anything works.
if there is a way to do it with an Arduino alone that would be great but I don't think that is possible
Which Arduino have you got in mind >
A Nano 33 IOT, for instance, can run a Webserver that allows a user to interact with the Arduino to set the state of outputs, read inputs etc. This can be done over the Internet if required
Not strictly an Arduino but an ESP32 is an even more powerful board that can do the same
A Nano 33 IOT, for instance, can run a Webserver that allows a user to interact with the Arduino to set the state of outputs, read inputs etc. This can be done over the Internet if required
Not strictly an Arduino but an ESP32 is an even more powerful board that can do the same
I have an Uno but if that can't work then I guess I don't really have a choice but to find a different one
and does the Nano 33 IOT work the same as a uno?? the way I have my circuit set up currently is a power module powering one servo and the IR reciver and the Arduino itself powering another servo
i also thought about wiring up a ir blaster to the Rpi and then making that blast out to the arduino but i couldnt find anything online on how to do that
The Wemos D1 Mini and NodeMCU boards will also work. You program them using the Arduino IDE, just as if they were an Arduino board, and they have WiFi built in. There's a couple of server example projects in the IDE.
Basically, yes, but be aware that it is a 3.3V device as are the ESP32 and other alternatives suggested but they all have the advantage of having built in WiFi systems so no external network connections are required
install Eclipse Mosquitto MQTT broker on Raspberry PI (google for many tutorials on how to do that)
To test your MQTT setup and play with the protocol
install Eclipse Paho on your PC (this allows you to play with the MQTT protocol and helps you with debugging later, you can test everything with this software before you program your Arduino)
Arduino
use a board that has build in WiFi e.g. Arduino Nano 33 IoT, Adafruit Feather M0 WiFi, the before mentioned ESP32 boards seem also popular
use the ArduinoMqttClient library (I have used it with the Nano 33 IoT and the Feather)
As suggested above, I think an ESP should to the trick just fine. I'm not familiar with the others.
I did a similar project with an ESP8266 Huzzah board, programmed with the Arduino IDE. So just the ESP board, that actually "acts" like the arduino here.
I had a simple webserver running on the ESP that served a page with some buttons to input the access code. With the right code people would be able to open de front door.
the code below running on the ESP
relay connected to it to open the door
ESP connected to my wifi
my router forwarded the connection from outside to the ESP with port mapping
Here's the code:
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#include <Streaming.h>
MDNSResponder mdns;
ESP8266WebServer server(80);
// Replace with your network credentials
const char* ssid = " ";
const char* password = " ";
//Variables to process input
int arrEnteredCode[] = {0,0,0};
int arrPassCode[] = {3,2,2};
String strReceived;
int intDigitReceived;
int intIndex = 0;
String strStartSpace = "
"; //3 lines of spacing which are replaced by the entered code
String strStartPage;
String strNewPage;
//Relais connected to:
int gpio0_pin = 5;
void setup(void){
// preparing GPIOs
pinMode(gpio0_pin, OUTPUT);
//digitalWrite(gpio0_pin, HIGH);
delay(1000);
Serial.begin(115200);
WiFi.begin(ssid, password);
// Wait for connection
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
if (mdns.begin("esp8266", WiFi.localIP())) {
Serial.println("MDNS responder started");
}
server.on("/", fncIndex);
server.on("/c", fncCheckCode);
server.begin();
Serial.println("HTTP server started");
strStartPage = "<center><a href=\"c?n=1\"> <button style=font-size:50px;width:50%;height:150> 1 </button>
";
strStartPage += "<a href=\"c?n=2\"> <button style=font-size:50px;width:50%;height:150> 2 </button>
";
strStartPage += "<a href=\"c?n=3\"> <button style=font-size:50px;width:50%;height:150> 3 </button>
";
strStartPage += "<a href=\"c?n=4\"> <button style=font-size:50px;width:50%;height:150> OK </button>
";
strStartPage += "</a></center>";
}
void fncIndex(){
Serial.println(server.arg(0) );
arrEnteredCode[0] = 0;
arrEnteredCode[1] = 0;
arrEnteredCode[2] = 0;
server.send(200, "text/html", strStartSpace + strStartPage);
}
void fncCheckCode(){
Serial.println(server.arg(0) );
strReceived = server.arg(0);
intDigitReceived = strReceived.toInt();
Serial << "intDigitReceived= " << intDigitReceived << " arrEnteredCode[0]= " << arrEnteredCode[0] << " arrEnteredCode[1]= " << arrEnteredCode[1] << " arrEnteredCode[2]= " << arrEnteredCode[2] << endl;
//app wil request /c?n=322 for instantly opening the door
if(intDigitReceived == 322){
digitalWrite(gpio0_pin, HIGH);
delay(500);
digitalWrite(gpio0_pin, LOW);
arrEnteredCode[0] = 0;
arrEnteredCode[1] = 0;
arrEnteredCode[2] = 0;
}
//if OK is pressed and the code is correct, open the door
if(intDigitReceived == 4 && arrEnteredCode[0] == arrPassCode[0] && arrEnteredCode[1] == arrPassCode[1] && arrEnteredCode[2] == arrPassCode[2]){
arrEnteredCode[0] = 0;
arrEnteredCode[1] = 0;
arrEnteredCode[2] = 0;
digitalWrite(gpio0_pin, HIGH);
delay(500);
digitalWrite(gpio0_pin, LOW);
server.send(200, "text/html", strStartSpace + strStartPage);
}else{
// 3 is the first digit of the passcode, if three is entered start at the beginning of arrEnteredCode
if( intDigitReceived == 3){
arrEnteredCode[0] = 3;
arrEnteredCode[1] = 0;
arrEnteredCode[2] = 0;
intIndex = 1;
}else{
arrEnteredCode[intIndex] = intDigitReceived;
intIndex++;
if(intIndex == 3){
intIndex = 0;
}
}
//display entered code
strNewPage = "
<center><font size=\"80\">" + String(arrEnteredCode[0]) + String(arrEnteredCode[1]) + String(arrEnteredCode[2]) + "</font></center>
" + strStartPage;
server.send(200, "text/html", strNewPage);
}
}
void loop(void){
server.handleClient();
}
"my final product should be a web page with an on and off button(s) that triggers the movement of servos."
You will need something with internet type connectivity. I've made simple web pages that controlled servos connected to an arduino with an ethernet shield. The ESP based wifi boards might be a good choice now days due to more memory and ease of setup. A web control page can be very simple like below
SteveMann:
The Wemos D1 Mini and NodeMCU boards will also work. You program them using the Arduino IDE, just as if they were an Arduino board, and they have WiFi built in. There's a couple of server example projects in the IDE.
so i was decided to go on the "easy" route and just use my raspberry pi, i have a program running there that is controlled by a telegram bot to turn on and off an led and it works fine.
any idea how to make it control the arduino code?? btw i would also like if possible to keep the ir control functionality.
code for pi:(access token is fake)
#coder :- Salman Faris
import sys
import time
import random
import datetime
import telepot
import RPi.GPIO as GPIO
#LED
def on(pin):
GPIO.output(pin,GPIO.HIGH)
return
def off(pin):
GPIO.output(pin,GPIO.LOW)
return
# to use Raspberry Pi board pin numbers
GPIO.setmode(GPIO.BOARD)
# set up GPIO output channel
GPIO.setup(11, GPIO.OUT)
def handle(msg):
chat_id = msg['chat']['id']
command = msg['text']
print 'Got command: %s' % command
if command == 'on':
bot.sendMessage(chat_id, on(11))
elif command =='off':
bot.sendMessage(chat_id, off(11))
bot = telepot.Bot('Bot Token')
bot.message_loop(handle)
print 'I am listening...'
while 1:
time.sleep(10)
and for arduino:
#include <Servo.h>
#include <IRremote.h>
int servoPin = 3;
int servo1Pin = 8;
const int RECV_PIN = 7;
IRrecv irrecv(RECV_PIN);
decode_results results;
Servo Servo1;
Servo servo2;
void setup() {
irrecv.enableIRIn();
irrecv.blink13(true);
Servo1.attach(3); // attaches the servo on pin 3 to the servo object
servo2.attach(8);
}
void loop() {
if (irrecv.decode(&results)) {
switch (results.value) {
case 16726215: //Keypad button "5"
on2();
break;
}
switch (results.value) {
case 16730805:
off2();
break;
}
irrecv.resume();
}
}
void on2() {
servo2.write(180);
delay(500);
Servo1.writeMicroseconds(850);
}
void off2() {
Servo1.writeMicroseconds(2500);
delay(500);
servo2.writeMicroseconds(850);
}