Here is the video and code for my latest video where I code in real time on a live stream. A short press will enable or disable the blink function. A long press will display humidity while the button is being pressed and stop when released but it won’t affect the blink function.
Watch the Video
View the Code
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#include "DHT.h" const char BTN_PIN = 4; const char HUMID_PIN = 5; const bool IS_PRESSED = false; const unsigned long SHORT_PRESS_LIMIT_MS = 1000; const unsigned long BLINK_DURATION_MS = 1000; bool shouldBlink = false; bool shouldReadHumid = false; DHT humidSensor(HUMID_PIN, DHT22); void setup() { Serial.begin(9600); pinMode(BTN_PIN, INPUT_PULLUP); pinMode(LED_BUILTIN, OUTPUT); humidSensor.begin(); Serial.println("Ready..."); } void loop() { if (digitalRead(BTN_PIN) == IS_PRESSED) { unsigned long pushTime = millis(); while (digitalRead(BTN_PIN) == IS_PRESSED) { // Do nothing while the button is pressed if (millis() - pushTime > SHORT_PRESS_LIMIT_MS) { myReadHumidity(); } blinkLED(); } unsigned long dt = millis() - pushTime; if (dt <= SHORT_PRESS_LIMIT_MS) { // Do short press stuff shouldBlink = !shouldBlink; } } // Call all our functions blinkLED(); } void myReadHumidity() { // (Play sound) float humidity = humidSensor.readHumidity(); Serial.print("Humidity: "); Serial.println(humidity); } void blinkLED() { static bool ledOn = false; static unsigned long lastStateChange = millis(); if (shouldBlink) { unsigned long dt = millis() - lastStateChange; if (dt >= BLINK_DURATION_MS) { ledOn = !ledOn; lastStateChange = millis(); } digitalWrite(LED_BUILTIN, ledOn); } else { digitalWrite(LED_BUILTIN, LOW); } } |
