void loop() { // read the input on analog pin 0: int sensorValue = analogRead(A0); // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V): float voltage = sensorValue * (5.0 / 1023.0); //
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void loop() { // read the input on analog pin 0: int sensorValue =analogRead(A0); // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V): float voltage = sensorValue * (5.0 / 1023.0); // print out the value you read: Serial.println(voltage); } 火...
/*Analog InputDemonstrates analog input by reading an analog sensor on analog pin 0 andturning on and off a light emittingdiode(LED) connected to digital pin 13.The amount of time the LED will be on and off depends on the value obtainedby analogRead().The circuit:- potentiometercenter pin ...
delay(2000);//wait 2s for next reading} 串行监视器上的输出如下所示: 我的测试环境是 100多一点时 表示有烟雾 ,正常是700多。(检测的是 A0 的输出) 我是用 打火机 打着火后 再吹灭。 放出的甲烷 气体 。直接 放到 检测器 边上。检测出 100多一点的 输出 ...
Demonstrates analog input by reading an analog sensor on analog pin 0 and turning on and off a light emitting diode(LED) connected to digital pin 13. The amount of time the LED will be on and off depends on the value obtained by analogRead(). ...
// read the input on analog pin 0: int sensorValue = analogRead(A0); // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V): float voltage = sensorValue * (5.0 / 1023.0); // print out the value you read: ...
// read the input on analog pin 0: 从模拟针脚 0 读取输入 int sensorValue = analogRead(A0); // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V): 将模拟读取(从 0-1023)转换为电压(0 - 5V): float voltage = sensorValue * (5.0 / 1023.0); ...
Last month, we introduced concepts for reading analog data from the environment using the Arduino ADC (analog-to-digital converter). We also learned how to use software to provide a very simple way to use a PC to send commands and data to the Arduino and then receive replies from the ...
sensorValue = analogRead(MQ2pin); // read analog input pin 0 Serial.print("Sensor Value: "); Serial.print(sensorValue); if(sensorValue < 300) //阈值 根据实际情况判断 大于300 还是小于300 ,300也是变量 { Serial.print(" | Smoke detected! 探测到烟雾 "); ...