High Voltage Python

Andrea Stagi Develover @ Nephila

SHIELDS

Arduino IDE

PRogramming With ARduino

#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {
  lcd.begin(16, 2);
  lcd.print("hello, world!");
}

void loop() {
  lcd.setCursor(0, 1);
  lcd.print(millis()/1000);
}

PRogramming With ARduino

// Pin 13 has an LED connected on most Arduino boards.
// give it a name:
int led = 13;

// the setup routine runs once when you press reset:
void setup() {                
  // initialize the digital pin as an output.
  pinMode(led, OUTPUT);     
}

// the loop routine runs over and over again forever:
void loop() {
  digitalWrite(led, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);               // wait for a second
  digitalWrite(led, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);               // wait for a second
}

Raspberry PI GPIO

Raspberry hats

Programming With Raspberry PI

import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BOARD)

GPIO.setup(7, GPIO.OUT)

GPIO.output(7,True)

The best of both worlds

USB connection

Duino
Nanpy
Firmata

How do they work?

Arduino

Duino

int led = 13;

void setup() {                
  pinMode(led, OUTPUT);     
}

void loop() {
  digitalWrite(led, HIGH);
  delay(1000);
  digitalWrite(led, LOW);
  delay(1000);
}

var arduino = require('duino'),
    board = new arduino.Board();

var led = new arduino.Led({
  board: board,
  pin: 13
});

led.blink(1000);

 ಠ_ಠ

Arduino

Nanpy

int led = 13;

void setup() {                
  pinMode(led, OUTPUT);     
}

void loop() {
  digitalWrite(led, HIGH);
  delay(1000);
  digitalWrite(led, LOW);
  delay(1000);
}

from nanpy import ArduinoApi, SerialManager
from time import sleep

a = ArduinoApi(connection=SerialManager())

a.pinMode(13, a.OUTPUT)

for i in range(10000):
    a.digitalWrite(13, (i + 1) % 2)
    sleep(1)

More

Objects MApping

1 Nanpy Object -> 1 Arduino Object

from nanpy import Servo
import time

servo = Servo(7)
for move in [0, 90, 180, 90, 0]:
    servo.write(move)
    time.sleep(1)

#ifndef SERVO_CLASS
#define SERVO_CLASS

#include "BaseClass.h"
#include "MethodDescriptor.h"

class Servo;

namespace nanpy {
    class ServoClass: public ObjectsManager<Servo> {

        public:
            void elaborate( nanpy::MethodDescriptor* m );
            const char* get_firmware_id();

    };
}

#endif

Objects MApping

void nanpy::ServoClass::elaborate( nanpy::MethodDescriptor* m ) {

        ObjectsManager<Servo>::elaborate(m);

        if (strcmp(m->getName(),"new") == 0) {       
            v.insert(new Servo());
            v[v.getLastIndex()]->attach(m->getInt(0));
            m->returns(v.getLastIndex());
        }

        if (strcmp(m->getName(), "write") == 0) {
            v[m->getObjectId()]->write(m->getInt(0));
            m->returns(0);
        }

        if (strcmp(m->getName(), "read") == 0) {
            m->returns(v[m->getObjectId()]->read());
        }

        if (strcmp(m->getName(), "writeMicroseconds") == 0) {
            v[m->getObjectId()]->writeMicroseconds(m->getInt(0));
            m->returns(0);
        }

        if (strcmp(m->getName(), "readMicroseconds") == 0) {
            m->returns(v[m->getObjectId()]->readMicroseconds());
        }

        // ...
}

from nanpy import DallasTemperature

sensors = DallasTemperature(5)
n_sensors = sensors.getDeviceCount()

print("There are %d devices connected on pin %d" % (n_sensors, sensors.pin))
addresses = []

for i in range(n_sensors):
    addresses.append(sensors.getAddress(i))

sensors.setResolution(12)

while True:
    sensors.requestTemperatures()
    for i in range(n_sensors):
        temp = sensors.getTempC(i)
        print("Device %d (%s) temperature is %0.2f °C" % (i, addresses[i], temp))
    print("\n")

Create your own Arduino framework

Protocol definition
FEW RAM & No GC
Memory fragmentation

First allocation

#define K (1024)

char *p1, *p2;

p1 = malloc(3*K);
p2 = malloc(4*K);

p2

p1

4K

3K FREE

3K

Deallocation

...

free(p1);

p1 = malloc(4*K);

...

p2

4K

3K FREE

3K FREE

Servo motor

Connection with Arduino

Altimeter

from mcpi import minecraft
from nanpy import Servo, SerialManager
import time

mc = minecraft.Minecraft.create()

def get_angle(pos_player, max_alt=180):
    angle = pos_player.y * (90.0/max_alt) + 90
    return int(angle)

connection = SerialManager(
    device='/dev/ttyACM0'
)

servo = Servo(
    7, 
    connection=connection,
    rtscts=True
)

while True:
    pos_player = mc.player.getPos()
    angle = get_angle(pos_player)
    servo.write(angle)

https://github.com/djangobeer/minecraftpi-hack

Django Rest Framework

DHT

Connection with Arduino

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