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Arduino. , - . Arduino Nano v3. 20$, 10. Aliexpress, , — .
C , . , - ( « — ») — , . :
, DHT11. ( « — »).

:
- 5V
:
- — 0 — 50°C ± 2°C
- — 20 — 95% ± 5%
:

#include <dht.h>
DHT sensor = DHT();
void setup()
{
Serial.begin(9600);
sensor.attach(A1);
delay(1000);
}
void loop()
{
sensor.update();
switch (sensor.getLastError())
{
case DHT_ERROR_OK:
char msg[128];
sprintf(msg, "Temperature = %dC, Humidity = %d%%",
sensor.getTemperatureInt(), sensor.getHumidityInt());
Serial.println(msg);
break;
case DHT_ERROR_START_FAILED_1:
Serial.println("Error: start failed (stage 1)");
break;
case DHT_ERROR_START_FAILED_2:
Serial.println("Error: start failed (stage 2)");
break;
case DHT_ERROR_READ_TIMEOUT:
Serial.println("Error: read timeout");
break;
case DHT_ERROR_CHECKSUM_FAILURE:
Serial.println("Error: checksum error");
break;
}
delay(2000);
}

, LM393 . , .
int sensorPin = A0;
unsigned int sensorValue = 0;
void setup()
{
pinMode(13, OUTPUT);
Serial.begin(9600);
}
void loop()
{
sensorValue = analogRead(sensorPin);
if(sensorValue<500) digitalWrite(13, HIGH);
else digitalWrite(13, LOW);
}

(0 1), . . :
Value = analogRead(A2);
. . : .

.. , «» . lcd 1602:

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