Níveis COVID-19 e PM10!

Ferramentas e máquinas necessárias

	Ferro de soldar (genérico)
	Arame de solda, sem chumbo
	Impressora 3D (genérica)
	Pistola de cola quente (genérica)
	Drill / Driver, Cordless

Aplicativos e serviços online

Arduino IDE

Sobre este projeto

Resumo

Introdução

• Níveis de concentração diários de PM10 (dados fornecidos pela Agência Regional de Proteção Ambiental - ARPA - e coletados em toda a Itália);
• As ultrapassagens diárias do valor limite PM10;
• O número de pessoas infectadas com COVID-19 para cada província selecionada, comunicado pela Proteção Civil e atualizado com frequência diária.

• Alta temperatura e radiação solar aceleram a inatividade;
• A alta umidade relativa pode promover a taxa de difusão.

Minha solução

• Normal:LEDs apagados;
• Baixo:LED verde aceso;
• Aviso:LEDs verdes e amarelos acesos;
• Alarme:LEDs verdes, amarelos e vermelhos acesos.

SDS018 - Sensor PM10

• Exato e confiável:detecção de laser, estável, boa consistência;
• Resposta rápida:o tempo de resposta é inferior a 10 segundos quando a cena muda;
• Fácil integração:saída UART (ou saída IO pode ser personalizada), ventilador integrado;
• Alta resolução:resolução de 0,3μg / m3;
• Certificação:os produtos passaram a certificação CE / FCC / RoHS.

• 1 - NC:Não conectar;
• 2 - 1um:saída PWM;
• 3 - 5V:fonte de alimentação;
• 4 - 2,5um:saída PWM;
• 5 - GND:Terra, conecte ao pólo negativo;
• 6 - R:RX de UART (TTL);
• 7 - T:TX de UART (TTL).

• O pino 5V (3) do sensor SDS018 está conectado ao pino 5V do Arduino Nano;
• O pino GND (5) do sensor SDS018 está conectado ao pino GND do Arduino Nano;
• O pino T (7) do sensor SDS018 é conectado ao pino RX do Arduino Nano;

Sensor DHT22

• 3 a 5 V de alimentação e E / S;
• 2,5mA máximo de uso atual durante a conversão (ao solicitar dados);
• leituras de umidade de 0-100% com precisão de 2-5%;
• leituras de temperatura de -40 a 80 ° C ± 0,5 ° C de precisão;
• Taxa de amostragem de 0,5 Hz (uma vez a cada 2 segundos).

• VDD:fonte de alimentação;
• DADOS:saída de dados do sinal;
• NC:Não conectado;
• GND:Terra, conecte ao pólo negativo.

• O pino VDD do sensor DHT22 está conectado ao pino 5V do Arduino Nano;
• O pino GND do sensor DHT22 está conectado ao pino GND do Arduino Nano;
• Entre os pinos VDD e GND do sensor DHT22, eu inseri um capacitor 100nF;
• Entre os pinos DATA e VCC do sensor DHT22, inseri um resistor pull-up de 4,7k;
• O pino DATA do sensor DHT22 está conectado ao pino D2 do Arduino Nano.

Visor OLED de matriz de pontos

• VCC:3,3-5V;
• Resolução:128x32 pixels;
• Fundo preto com caracteres brancos;
• Driver:SSD1306;
• Interface:I2C.

• SDA:dados seriais I2C;
• SCL:relógio serial I2C;
• VCC:fonte de alimentação;
• GND:Terra, conectado ao pólo negativo.

• O pino VCC do display está conectado ao pino 5V do Arduino Nano;
• O pino GND da tela está conectado ao pino GND do Arduino Nano;
• O pino SCL da tela está conectado ao pino A5 do Arduino Nano;
• O pino SDA da tela é conectado ao pino A4 do Arduino Nano.

Conexões de LEDs

• O ânodo do LED vermelho está conectado ao pino D3 do Arduino Nano;
• O ânodo do LED verde está conectado ao pino D4 do Arduino Nano;
• O ânodo do LED amarelo é conectado ao pino D5 do Arduino Nano;
• Soldei um resistor de 390 Ohm em série ao cátodo de cada LED e conectei o outro pino do resistor ao GND do Arduino Nano.

Arduino nano - modificação de hardware

Fonte de alimentação

• USB;
• Vin pin (e GND pin):7-12 V.

Caixa e montagem

Firmware

• Only at the first loop (startup) there are 2 seconds delay;
• The DHT22 sensor is read;
• Temperature and relative humidity are sent to Arduino IDE serial monitor (see the figure below);
• The SDS018 sensor is read;
• PM2.5 and PM10 are sent to Arduino IDE serial monitor (see the figure below);
• If particulate matter concentrations are from 0 to 25 µg/m3 and humidity is between 40% and 60% - Normal alarm state -, then all LEDs get OFF;
• If particulate matter concentrations are from 0 to 25 µg/m3 and humidity is <40% or> 60% or particulate matter concentrations are from 26 to 50 µg/m3 and humidity is between 40% and 60% (to simplify the code I have separated the conditions) - Low alarm state -, then only green LED gets ON;
• If particulate matter concentrations are from 26 to 50 µg/m3 and humidity is <40% or> 60% or particulate matter concentrations are> 51 µg/m3 and humidity is between 40% and 60% (to simplify the code I have separated the conditions) - Warning alarm state -, then green and yellow LEDs get ON;
• If particulate matter concentrations are> 51 µg/m3 and humidity is <40% or> 60% - Alarm state -, then all LEDs get ON;
• If switchDisplay flag variable is equal to zero, then PM10 and humidity are visualized on display, otherwise are visualized PM2.5 and temperature in degrees Celsius; if there is an alarm state, instead of displaying PM10, it is visualized the word "Alarm!!!".

That's all!

Código

• COVID-19 and PM10 levels! - Code

COVID-19 and PM10 levels! - CodeArduino

#include #define SCREEN_WIDTH 128 // OLED display width, in pixels#define SCREEN_HEIGHT 32 // OLED display height, in pixels// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)#define OLED_RESET 4 // Reset pin # (or -1 if sharing Arduino reset pin)Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);#include "DHT.h"#define DHTPIN 2 // Digital pin connected to the DHT sensor #define DHTTYPE DHT22 // DHT22 (AM2302)DHT dht(DHTPIN, DHTTYPE);int startdhr22 =0; // Startup flag variable:waiting for the first measurement of DHT22int switchDisplay =0; // Flag variable for switch data on the displayconst int ledRed =3; // Number of Red LED pinconst int ledGreen =4; // Number of Green LED pinconst int ledYellow =5; // Number of Yellow LED pinvoid setup() { pinMode(LED_BUILTIN, OUTPUT); // On-board LED - initialize digital pin LED_BUILTIN as an output pinMode(ledRed, OUTPUT); // Initialize digital pin as an output pinMode(ledGreen, OUTPUT); // Initialize digital pin as an output pinMode(ledYellow, OUTPUT); // Initialize digital pin as an output dht.begin(); Serial.begin (9600); Serial.println("start"); // SSD1306_SWITCHCAPVCC =generate display voltage from 3.3V internally if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3C for 128x32 Serial.println(F("SSD1306 allocation failed")); for(;;); // Do not proceed, loop forever } display.clearDisplay(); // Clear the buffer display.setTextSize(2); // Draw 2X-scale text display.setTextColor(SSD1306_WHITE); // Startup:LEDs Test digitalWrite(ledGreen, HIGH); // Turn the LED ON delay(500); // Wait for 0,5 secondS digitalWrite(ledYellow, HIGH); // Turn the LED ON delay(500); // Wait for 0,5 secondS digitalWrite(ledRed, HIGH); // Turn the LED ON delay(500); // Wait for 0,5 secondS digitalWrite(ledGreen, LOW); // Turn the LED OFF digitalWrite(ledYellow, LOW); // Turn the LED OFF digitalWrite(ledRed, LOW); // Turn the LED OFF delay(500); // Wait for 0,5 secondS}void loop() { // ########################################################################### // DHT22 // 0.5 Hz sampling rate (once every 2 seconds). // ########################################################################### if(0 ==startdhr22) { delay(2000); // Startup:waiting for the first measurement of DHT22 startdhr22 =1; } float h =dht.readHumidity(); float t =dht.readTemperature(); // Read temperature as Celsius (default) // Check if any reads failed and exit early (to try again). if (isnan(h) || isnan(t)) { Serial.println(F("Failed to read from DHT sensor!")); Retorna; } Serial.print(F("Humidity:")); Serial.print(h); Serial.print(F("% Temperature:")); Serial.print(t); Serial.println(F("°C ")); // ########################################################################### // SDS018 // ########################################################################### uint8_t dataIN[10] ={0}; // Data array from SDS018 float pm25; float pm10; while(Serial.available()> 0) { for(int i=0; i<10; ++i) { // loop for acquire 10 bytes dataIN[i] =Serial.read(); // Save data in to dataIN array // Serial.println(dataIN[i], HEX); // Test:Prints data to the serial port (print as an ASCII-encoded hexadecimal) } if((0xAA ==dataIN[0]) &&(0xC0 ==dataIN[1]) &&(0xAB ==dataIN[9])) { // check if array contains dataIN[0]=0xAA and dataIN[1]=0xC0 and dataIN[1]=0xAB uint8_t cksum =0; for(int i=2; i<=7; ++i) { cksum +=dataIN[i]; // Calculation of check-sum } //Serial.print("check-sum:"); // Test:Serial monitor //Serial.println(cksum, HEX); if(cksum ==dataIN[8]) { digitalWrite(LED_BUILTIN, HIGH); // Turn the LED on (HIGH is the voltage level) uint8_t pm25Lo =dataIN[2]; // PM2.5 low byte uint8_t pm25Hi =dataIN[3]; // PM2.5 high byte uint8_t pm10Lo =dataIN[4]; // PM10 low byte uint8_t pm10Hi =dataIN[5]; // PM10 high byte pm25 =((pm25Hi * 256.0) + pm25Lo)/10.0; // Calculation of PM2.5 value pm10 =((pm10Hi * 256.0) + pm10Lo)/10.0; // Calculation of PM10 value Serial.print("PM2.5:"); // Serial monitor Serial.print(pm25); Serial.println(" ug/m3"); Serial.print("PM10:"); Serial.print(pm10); Serial.println(" ug/m3"); } Serial.println("-----------------"); } Serial.flush(); } // ########################################################################### // LEDs // ########################################################################### if((pm10 <=25) &&((h>=40) &&(h <=60))) // Normal – Particulate matter concentrations from 0 to 25 µg/m3 and humidity between 40% and 60%; { digitalWrite(ledGreen, LOW); // Turn the LED OFF digitalWrite(ledYellow, LOW); // Turn the LED OFF digitalWrite(ledRed, LOW); // Turn the LED OFF } else if((pm10 <=25) &&((h <40) || (h> 60))) // Low - Particulate matter concentrations from 0 to 25 µg/m3 and humidity <40% o> 60%; { digitalWrite(ledGreen, HIGH); // Turn the LED ON digitalWrite(ledYellow, LOW); // Turn the LED OFF digitalWrite(ledRed, LOW); // Turn the LED OFF } else if(((pm10> 25) &&(pm10 <=50)) &&((h>=40) &&(h <=60))) // Low - Particulate matter concentrations from 26 to 50 µg/m3 and humidity between 40% and 60%; { digitalWrite(ledGreen, HIGH); // Turn the LED ON digitalWrite(ledYellow, LOW); // Turn the LED OFF digitalWrite(ledRed, LOW); // Turn the LED OFF } else if(((pm10> 25) &&(pm10 <=50)) &&((h <40) || (h> 60))) // Warning - Particulate matter concentrations from 26 to 50 µg/m3 and humidity <40% o> 60%; { digitalWrite(ledGreen, HIGH); // Turn the LED ON digitalWrite(ledYellow, HIGH); // Turn the LED ON digitalWrite(ledRed, LOW); // Turn the LED OFF } else if((pm10> 50) &&((h>=40) &&(h <=60))) // Warning - Particulate matter concentrations> 51 µg/m3 and humidity between 40% and 60%; { digitalWrite(ledGreen, HIGH); // Turn the LED ON digitalWrite(ledYellow, HIGH); // Turn the LED ON digitalWrite(ledRed, LOW); // Turn the LED OFF } else // Alarm - Particulate matter concentrations> 51 µg/m3 and humidity <40% or> 60%. { digitalWrite(ledGreen, HIGH); // Turn the LED ON digitalWrite(ledYellow, HIGH); // Turn the LED ON digitalWrite(ledRed, HIGH); // Turn the LED ON } // ########################################################################### // Display // ########################################################################### if(0 ==switchDisplay) { display.clearDisplay(); display.setTextColor(SSD1306_WHITE); display.setCursor(0,0); // Set the cursor position (Width, Height) if(pm10> 50) // Visualize the word "Alarm" on display { display.print("Alarm!!!"); } else // Visualize the PM10 value on display { display.print("PM10:"); display.println(pm10); } display.print(" HR%:"); // Visualize the humidity value on display display.println(h); display.display(); switchDisplay =1; } else { display.clearDisplay(); display.setTextColor(SSD1306_BLACK, SSD1306_WHITE); // Draw 'inverse' text display.setCursor(0,0); // Set the cursor position (Width, Height) display.print("PM25:"); // Visualize the PM2.5 value on display display.println(pm25); display.print("T[C]:"); // Visualize the temperature value on display display.println(t); display.display(); switchDisplay =0; } atraso (500); // Delay of 500ms digitalWrite(LED_BUILTIN, LOW); // TEST:turn the LED_BUILTIN OFF delay(1500); // Delay of 1500ms}

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