AIO + Rasp + ARDUINO for Pump control

[alexglowee]

I everybody,

Today, I learnt about controlling my Arduino with raspberry via Adafruit AIO. I will post the code below. I success to receive data of a potentiometer and set ON/OFF two LEDs, it works well (but it's not very responsive, I'm limited by the rate limit of Adafruit, that's why I added a millis() timer in my code).

But it's not sufficient for my project. I have a peristaltic pump and I need to control the pump with a slider object (from 0 to 255 PWM for example).
I will create a pump feed that sends data from AIO to my raspberry but I don't know how I can send, at the same time, the string which commands the Arduino and the slide value, and how I can retrieve the data to send the command to the pump.

If you have ideas, I'm in !!

Thanks,

... Alex

 
int led1= 6;
int led2= 5;
int poto = A2;
unsigned long currentTime = 0;
unsigned long previousTime = 0;

void setup() {
   Serial.begin(115200);  // start serial communication at 9600 baud
   pinMode(led1, OUTPUT);
   pinMode(led2, OUTPUT);
   pinMode(poto, INPUT);
}


void loop() {
  currentTime = millis();
  if ((currentTime-previousTime)>1500){ //AIO rate limit 6O threads per seconds
    previousTime = currentTime;
    const int poto_value=analogRead(poto);
    Serial.println(poto_value);
    if (Serial.available()) {  // check for incoming serial data
       String command = Serial.readString();  // read command from serial port
       if (command == "led_1_on") {  // turn on LED
          digitalWrite(led1, HIGH);
       } else if (command == "led_1_off") {  // turn off LED
          digitalWrite(led1, LOW);
       } else if (command == "led_2_on") {  // turn off LED
          digitalWrite(led2, HIGH);
       } else if (command == "led_2_off") {  // turn off LED
          digitalWrite(led2, LOW);
       }
    }
  }
}

And here is my rasp code :

#!/usr/bin/env python3
"""Control an Arduino over the USB port"""

import serial
from Adafruit_IO import Client
from time import sleep

USB_PORT="/dev/ttyACM0" #Port USB raspberry
baudrate=115200

try:
   s = serial.Serial(USB_PORT,baudrate, timeout=30) #timeout ?
except:
   print("Error - Could not open USB Serial Port Please check your port name and permissions")
   print("Exiting program")
   exit()

ADAFRUIT_IO_USERNAME = "alexglowee"
ADAFRUIT_IO_KEY = "aio_UmjB60kISJn2XsQ9wcRuDyg2FaZ1"
aio = Client(ADAFRUIT_IO_USERNAME, ADAFRUIT_IO_KEY)

pompe = aio.feeds('proto.pompe')

output = open('data.csv', 'w')

etat_led_1 = "OFF"
etat_led_2 = "OFF"

while 1:
   s.dtr=0
   s.dtr=1
   sleep(0.2)
   s.reset_input_buffer()
   while 1:
      #data = s.readline().decode()
      #output.write(data)
      #output.flush()
      aio.send_data(pompe.key, data)
      led_1 = aio.receive("proto.led-1")
      led_2 = aio.receive("proto.led-2")
      led_value_1 = led_1.value
      led_value_2 = led_2.value
      if led_value_1 != etat_led_1:
         if etat_led_1 == "OFF":
            s.write(b'led_1_on')
         elif etat_led_1 == "ON":
            s.write(b'led_1_off')
         etat_led_1 = led_value_1
      if led_value_2 != etat_led_2:
         if etat_led_2 == "OFF":
            s.write(b'led_2_on')
         elif etat_led_2 == "ON":
            s.write(b'led_2_off')
         etat_led_2 = led_value_2