Thanks everyone, it's fixed now. I needed to use == instead of = in my if clause (actually I have < in there now and that works), and I was missing a bracket
I'm working on a humidity monitor. It looks at a sensor every 2 seconds, and has both an LED indicator and a piezo buzzer. I don't want the buzzer to go off every 2 seconds though, so I'm trying to make it go off only once every 10 times it looks at the sensor for now. I want my for loop to go from 0 to 10 and then back to zero, but for some reason it's only going from 0 to 1 and then staying at 1 (as viewed when I look at the serial monitor). Can someone point out what I'm doing wrong? It's based on an example piece of code from adafruit for the DHT22 sensor.
The code:
// Example testing sketch for various DHT humidity/temperature sensors
// Written by ladyada, public domain
// REQUIRES the following Arduino libraries:
// - DHT Sensor Library: https://github.com/adafruit/DHT-sensor-library
// - Adafruit Unified Sensor Lib: https://github.com/adafruit/Adafruit_Sensor
#include "DHT.h"
#define DHTPIN 2 // Digital pin connected to the DHT sensor
// Feather HUZZAH ESP8266 note: use pins 3, 4, 5, 12, 13 or 14 --
// Pin 15 can work but DHT must be disconnected during program upload.
#define buzzer 8 // defines the pin the piezo buzzer is connected to
#define red 9 // defines the pin of the red led componant
#define blue 10 // defines the pin of the blue led componant
// Uncomment whatever type you're using!
//#define DHTTYPE DHT11 // DHT 11
#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321
//#define DHTTYPE DHT21 // DHT 21 (AM2301)
// Connect pin 1 (on the left) of the sensor to +5V
// NOTE: If using a board with 3.3V logic like an Arduino Due connect pin 1
// to 3.3V instead of 5V!
// Connect pin 2 of the sensor to whatever your DHTPIN is
// Connect pin 4 (on the right) of the sensor to GROUND
// Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor
// Initialize DHT sensor.
// Note that older versions of this library took an optional third parameter to
// tweak the timings for faster processors. This parameter is no longer needed
// as the current DHT reading algorithm adjusts itself to work on faster procs.
DHT dht(DHTPIN, DHTTYPE);
void setup() {
Serial.begin(9600);
Serial.println(F("DHTxx test!"));
tone(buzzer, 500, 500);
pinMode(red, OUTPUT);
pinMode(blue, OUTPUT);
dht.begin();
}
void loop() {
int i;
for (i=0;i<10;i++){
// Wait a few seconds between measurements.
delay(2000);
// Reading temperature or humidity takes about 250 milliseconds!
// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
float h = dht.readHumidity();
// Read temperature as Celsius (the default)
float t = dht.readTemperature();
// Read temperature as Fahrenheit (isFahrenheit = true)
float f = dht.readTemperature(true);
// Check if any reads failed and exit early (to try again).
if (isnan(h) || isnan(t) || isnan(f)) {
Serial.println(F("Failed to read from DHT sensor!"));
return;
}
// Compute heat index in Fahrenheit (the default)
float hif = dht.computeHeatIndex(f, h);
// Compute heat index in Celsius (isFahreheit = false)
float hic = dht.computeHeatIndex(t, h, false);
Serial.print(F("Humidity: "));
Serial.print(h);
Serial.print(F("% Temperature: "));
Serial.print(t);
Serial.print(F("°C "));
Serial.print(f);
Serial.print(F("°F Heat index: "));
Serial.print(hic);
Serial.print(F("°C "));
Serial.print(hif);
Serial.println(F("°F"));
int H = h * 10;
Serial.print("Buzzertone: ");
Serial.print(H);
Serial.print("hrtz interval: ");
Serial.println(i);
if (i=0) tone(buzzer, H, 200);
analogWrite(red, t);
analogWrite(blue, h);
}
}
