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Why Won't my Serial Read value stay the same

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1

I am trying to write to serial to control the brightness of an LED. When I initially type in a value such as '50' or '100', the LED lights up, but then the 'ppm' value drops down to '10' and just stays there (regardless of what I enter in initially. Any idea why this is occurring?

int ledpin1 = 3;
int pwm = 0;

void setup() 
 // initialize serial communication at 9600 bits per second:
 Serial.begin(9600);
 pinMode(ledpin1, OUTPUT);


// the loop routine runs over and over again forever:
void loop() 
 // reads input to serial monitor
 if (Serial.available() > 0) 
 pwm = Serial.read();
 

 analogWrite(ledpin1, pwm);
 Serial.print("PWM value is: ");
 Serial.println(pwm);
 delay(1000);

serial pwm

share|improve this question

edited 8 hours ago

VE7JRO♦

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s_barb_27s_barb_27

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1

I am trying to write to serial to control the brightness of an LED. When I initially type in a value such as '50' or '100', the LED lights up, but then the 'ppm' value drops down to '10' and just stays there (regardless of what I enter in initially. Any idea why this is occurring?

int ledpin1 = 3;
int pwm = 0;

void setup() 
 // initialize serial communication at 9600 bits per second:
 Serial.begin(9600);
 pinMode(ledpin1, OUTPUT);


// the loop routine runs over and over again forever:
void loop() 
 // reads input to serial monitor
 if (Serial.available() > 0) 
 pwm = Serial.read();
 

 analogWrite(ledpin1, pwm);
 Serial.print("PWM value is: ");
 Serial.println(pwm);
 delay(1000);

serial pwm

share|improve this question

edited 8 hours ago

VE7JRO♦

1,86766 gold badges1414 silver badges2424 bronze badges

asked 9 hours ago

s_barb_27s_barb_27

611 bronze badge

New contributor

s_barb_27 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

I am trying to write to serial to control the brightness of an LED. When I initially type in a value such as '50' or '100', the LED lights up, but then the 'ppm' value drops down to '10' and just stays there (regardless of what I enter in initially. Any idea why this is occurring?

int ledpin1 = 3;
int pwm = 0;

void setup() 
 // initialize serial communication at 9600 bits per second:
 Serial.begin(9600);
 pinMode(ledpin1, OUTPUT);


// the loop routine runs over and over again forever:
void loop() 
 // reads input to serial monitor
 if (Serial.available() > 0) 
 pwm = Serial.read();
 

 analogWrite(ledpin1, pwm);
 Serial.print("PWM value is: ");
 Serial.println(pwm);
 delay(1000);

serial pwm

share|improve this question

edited 8 hours ago

VE7JRO♦

1,86766 gold badges1414 silver badges2424 bronze badges

asked 9 hours ago

s_barb_27s_barb_27

611 bronze badge

New contributor

s_barb_27 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

int ledpin1 = 3;
int pwm = 0;

void setup() 
 // initialize serial communication at 9600 bits per second:
 Serial.begin(9600);
 pinMode(ledpin1, OUTPUT);


// the loop routine runs over and over again forever:
void loop() 
 // reads input to serial monitor
 if (Serial.available() > 0) 
 pwm = Serial.read();
 

 analogWrite(ledpin1, pwm);
 Serial.print("PWM value is: ");
 Serial.println(pwm);
 delay(1000);

share|improve this question

edited 8 hours ago

VE7JRO♦

1,86766 gold badges1414 silver badges2424 bronze badges

asked 9 hours ago

s_barb_27s_barb_27

611 bronze badge

New contributor

s_barb_27 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 8 hours ago

VE7JRO♦

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asked 9 hours ago

s_barb_27s_barb_27

611 bronze badge

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s_barb_27 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

edited 8 hours ago

VE7JRO♦

1,86766 gold badges1414 silver badges2424 bronze badges

edited 8 hours ago

VE7JRO♦

1,86766 gold badges1414 silver badges2424 bronze badges

asked 9 hours ago

s_barb_27s_barb_27

611 bronze badge

New contributor

s_barb_27 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 9 hours ago

s_barb_27s_barb_27

611 bronze badge

1 Answer
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3

When you type "100" you aren't sending the number 100. You're sending the characters "1", "0", "0", and whatever selected line ending you have (CR, LF, or CR and LF).

So if you have CR+LF for your line ending you're reading the numbers 49, 48, 48, 13 then 10.

You need to read the characters as they arrive and group them into a representation of the number (up until you get the line ending), then convert that representation into an actual number.

• Reading Serial on the Arduino

share|improve this answer

answered 9 hours ago

Majenko♦Majenko

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3

When you type "100" you aren't sending the number 100. You're sending the characters "1", "0", "0", and whatever selected line ending you have (CR, LF, or CR and LF).

So if you have CR+LF for your line ending you're reading the numbers 49, 48, 48, 13 then 10.

You need to read the characters as they arrive and group them into a representation of the number (up until you get the line ending), then convert that representation into an actual number.

• Reading Serial on the Arduino

share|improve this answer

answered 9 hours ago

Majenko♦Majenko

73.5k44 gold badges3838 silver badges8585 bronze badges

add a comment | 

3

When you type "100" you aren't sending the number 100. You're sending the characters "1", "0", "0", and whatever selected line ending you have (CR, LF, or CR and LF).

So if you have CR+LF for your line ending you're reading the numbers 49, 48, 48, 13 then 10.

You need to read the characters as they arrive and group them into a representation of the number (up until you get the line ending), then convert that representation into an actual number.

• Reading Serial on the Arduino

share|improve this answer

answered 9 hours ago

Majenko♦Majenko

73.5k44 gold badges3838 silver badges8585 bronze badges

add a comment | 

When you type "100" you aren't sending the number 100. You're sending the characters "1", "0", "0", and whatever selected line ending you have (CR, LF, or CR and LF).

So if you have CR+LF for your line ending you're reading the numbers 49, 48, 48, 13 then 10.

You need to read the characters as they arrive and group them into a representation of the number (up until you get the line ending), then convert that representation into an actual number.

• Reading Serial on the Arduino

share|improve this answer

answered 9 hours ago

Majenko♦Majenko

73.5k44 gold badges3838 silver badges8585 bronze badges

share|improve this answer

answered 9 hours ago

Majenko♦Majenko

73.5k44 gold badges3838 silver badges8585 bronze badges

answered 9 hours ago

Majenko♦Majenko

73.5k44 gold badges3838 silver badges8585 bronze badges

answered 9 hours ago

Majenko♦Majenko

73.5k44 gold badges3838 silver badges8585 bronze badges