I have a CO gas sensor module that is a digital sensor. I am trying to program my arduino uno to give 5V to one of the module pins for 60 seconds, but there is something wrong with my code. Can someone please help me? This is my first time programming the Arduino. I'm including some code that came with the module (but it's not in Arduino language), and I am including my code. Could someone look at it?
CO sensor module code:
' =========================================================================
'
' File...... CO Gas Sensor.bs2
' Purpose... Runs the CO Gas Sensor Module Heater
' Author.... Parallax, Inc.
' {$STAMP BS2}
' {$PBASIC 2.5}
'
' =========================================================================
' -----[ Program Description ]---------------------------------------------
' This program runs the Gas Sensor Heater through two phases (voltages) as
' recommended by the manufacturer datasheet. The sensor should run for at
' least 10 minutes in clean air before any calibration is done.
' The first phase is the PURGE phase where the heater element is turned on
' at a full 5V. This clears the sensor and no checking for an alarm
' condition is done here. The DEBUG screen will count down the 60 seconds
' of this phase.
' The second phase is the SENSE phase where the heater element is run at
' ~1.4V for 90 seconds. It is during this phase that the sensor can be
' calibrated or that the sensor is checked for alarm conditions.
' -----[ I/O Definitions ]-------------------------------------------------
HSW PIN 0 ' Heater Switch Control
ALR PIN 1 ' Alarm Input Sense
' -----[ Variables ]-------------------------------------------------------
index VAR Word ' Counter Variable
' -----[ Program Code ]----------------------------------------------------
Main:
DO
LOW HSW ' Turn Heater ON
FOR index = 59 TO 0 ' Count Down 60 Seconds
DEBUG HOME, "PURGE MODE...", DEC2 index, " "
PAUSE 1000 ' 1 Second Pause
NEXT
index = 1710 ' Approximately 90 Seconds
DO ' Of Iterations On BS2
DEBUG HOME, "SENSE MODE...", DEC2 index / 19
LOW HSW ' Turn Heater ON
PAUSE 15 ' For 15 mS
INPUT HSW ' Turn Heater OFF
PAUSE 3 ' For 3 mS
index = index - 1 ' Decrement Counter
IF ALR = 1 THEN ' Check For Alarm Condition
DEBUG " ALARM" ' Display Alarm Condition
ELSE
DEBUG " " ' Clear Alarm Condition
ENDIF
LOOP UNTIL index = 0 ' End Of Sense Mode Loop
LOOP
My Code:
int ALR = 8;
int HSW = 7;
int LEDpin = 13;
void setup()
{
Serial.begin(9600); // sets the serial port to 9600ms
pinMode(HSW, INPUT); //sets pin 7 as the input for the HSW
pinMode(ALR, OUTPUT); //sets pin 8 as the output for ALR
}
void loop()
{
digitalWrite(HSW, HIGH); //sets HSW high
delay(60000); //waits 60s
delay(1000); //wait for 1s
digitalWrite(HSW,HIGH); //HSW is set high again
delay(90000); //waits 90s
digitalRead(ALR); //it will read the value at pin 8 if it;s high or low
if (ALR = 1) //if ALR is high (CO detected) then pin 13 will be high
{
digitalWrite(LEDpin, HIGH);
}
else
{
digitalWrite(LEDpin, LOW);
}
}