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/*HCHOtest1.0.ino | |
Barebones sketch to read an analog voltage between 0 and 100mV. | |
An internal reference voltage of 1.1v is used to scale the digital conversion. | |
The maximum output of the HCHO sensor (100mV) is converted to a value of 103. | |
This value of 103 should equal a reading of 1000ppb HCHO. | |
*/ | |
int analogPin = 3; // Tip of output HCHO sensor jack connected to analog pin 3 | |
// Ring of HCHO sensor connector connected to GND | |
int voltRaw = 0; // variable to store the sensor value read | |
int ppbHCHO = 0; // variable to store a result | |
void setup() | |
{ | |
analogReference(INTERNAL); // Set analog reference to 1.1 volts | |
Serial.begin(9600); // setup serial | |
} | |
void loop() | |
{ | |
voltRaw = analogRead(analogPin); // read the input pin | |
ppbHCHO = voltRaw*10; // scale the result between 0 and 1023 | |
Serial.print("Value between 0 and 103: "); // Print to serial monitor | |
Serial.println(voltRaw); // this is the conversion of the analog voltage to a digital number | |
Serial.print("Value between 0 and 1023"); | |
Serial.println(ppbHCHO); // This might approximate ppb | |
delay(3000); // take a reading and print to the serial monitor every 3 seconds | |
} |
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