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pkoscielnypkoscielny
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Added fully working code
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‎README.md

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# air_throttle
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Air flow controlled by throttle with stepper motor
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# Air throttle
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Air flow controlled by throttle valve with stepper motor.
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A Hall-effect sensor detects when a stove is running and open the throttle.
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Otherwise the throttle is closed.
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## Hardware
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### List of components
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* SparkFun Pro Micro 5V 16MHz
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* stepper motor 28BYJ-48
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* ULN2003 driver for stepper motors
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* Hall-effect sensor ACS712 - 20A
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* simple ventilation throttle valve
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* 0.96 OLED display (optionally)

‎air_throttle.ino

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/*
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* Hardware:
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* - board SparkFun Pro Micro 5V 16MHz.
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* - step motor 28BYJ-48 with ULN2003 driver
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* - hall sensor ACS712 - 20A.
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*
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*/
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#include <ACS712.h>
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#include <Stepper.h>
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// Motor.
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const int steps = 32; // the number of motor steps.
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const int rotate_360 = 2048; // 32*64 - because of gear.
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Stepper motor(steps, 6, 8, 7, 9); // pay attention to pins order. Current order is proper.
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// HALL effect sensor.
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// SparFun has 5.0 volt with a max value of 1023 steps.
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// ACS712 5A uses 185 mV per A.
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// ACS712 20A uses 100 mV per A. <<-----------
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// ACS712 30A uses 66 mV per A.
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ACS712 acs(A0, 5.0, 1023, 100);
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void setup() {
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// Init rotor.
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motor.setSpeed(800);
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// Init HALL sensor.
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acs.autoMidPoint();
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}
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bool is_stove_running = false;
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bool is_throttle_opened = false;
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int mA; // the value taken from Hall sensor (in miliampers).
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void loop() {
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// Read current.
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mA = acs.mA_AC();
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//Serial.println(mA);
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// Stove is running.
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is_stove_running = (mA > 200) ? true : false;
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// Run motor if needed.
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if (is_stove_running && !is_throttle_opened) {
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open_throttle(motor);
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is_throttle_opened = true;
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}
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else if (!is_stove_running && is_throttle_opened) {
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close_throttle(motor);
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is_throttle_opened = false;
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}
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delay(500);
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}
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void open_throttle (Stepper motor) {
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motor.step(rotate_360/4); // 512 == turn 90 deg.
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}
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void close_throttle (Stepper motor) {
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motor.step(-rotate_360/4); // 512 == turn 90 deg.
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}
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‎air_throttle_with_oled.ino

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#include <ACS712.h>
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#include <Stepper.h>
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#include <Adafruit_SSD1306.h>
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#include <Adafruit_GFX.h>
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// OLED display.
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#define OLED_ADDR 0x3C
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Adafruit_SSD1306 display(-1);
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// Motor.
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const int steps = 32; // the number of motor steps.
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const int rotate_360 = 2048; // 32*64 - because of gear.
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Stepper motor(steps, 6, 8, 7, 9); // pay attention to pins order. Current order is proper.
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// HALL effect sensor.
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// SparFun has 5.0 volt with a max value of 1023 steps.
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// ACS712 5A uses 185 mV per A.
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// ACS712 20A uses 100 mV per A. <<-----------
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// ACS712 30A uses 66 mV per A.
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ACS712 acs(A0, 5.0, 1023, 100);
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void setup() {
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// Init rotor.
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motor.setSpeed(800);
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// Init HALL sensor.
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//pinMode(A0, INPUT);
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acs.autoMidPoint();
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// Init and clear OLED display.
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display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR);
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display.clearDisplay();
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display.display();
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display.setTextColor(WHITE);
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}
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bool is_stove_running = false;
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bool is_throttle_opened = false;
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int mA; // the value taken from Hall sensor (in miliampers).
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void loop() {
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// Read current.
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mA = acs.mA_AC();
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display_hall(mA, is_throttle_opened);
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//Serial.println(mA);
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// Stove is running.
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is_stove_running = (mA > 200) ? true : false;
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// Run motor if needed.
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if (is_stove_running && !is_throttle_opened) {
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display_throttle_state("opening...");
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open_throttle(motor);
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is_throttle_opened = true;
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}
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else if (!is_stove_running && is_throttle_opened) {
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display_throttle_state("closing...");
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close_throttle(motor);
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is_throttle_opened = false;
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}
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delay(500);
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}
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void open_throttle (Stepper motor) {
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motor.step(rotate_360/4); // 512 == turn 90 deg.
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}
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void close_throttle (Stepper motor) {
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motor.step(-rotate_360/4); // 512 == turn 90 deg.
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}
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// Views definitions.
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void display_hall(int hall, bool is_throttle_opened) {
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display.clearDisplay();
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display.setTextSize(1);
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display.setCursor(0, 0);
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display.print("Hall [mA]:\n");
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display.setTextSize(2);
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display.print(hall);
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display.print("\n");
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display.setTextSize(1);
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display.print("Throttle: ");
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if (is_throttle_opened) {
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display.print("opened");
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} else {
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display.print("closed");
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}
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display.display();
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}
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void display_throttle_state(String msg) {
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display.clearDisplay();
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display.setTextSize(1);
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display.setCursor(0, 0);
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display.print("Throttle:\n");
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display.setTextSize(2);
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display.print(msg);
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display.display();
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}
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