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Fixed syntax highlighting, added tag.

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edited Aug 24, 2019 at 20:39

VE7JRO

edited Aug 24, 2019 at 20:39

VE7JRO

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I am using Arduino Uno Rev 3, and according to this link we can achieve 2000000 baud rate.

This problem can be easily repeated by the following code:

void setup() {
 Serial.begin(2000000);
}
void loop() {
 int val = 234;
 Serial.println(val);
}

void setup() {
 Serial.begin(2000000);
}
void loop() {
 int val = 234;
 Serial.println(val);
}

I am using the serial-USB cable. To read the data, I used Python pyserial (< 20 lines of code including empty lines and import lines):

import serial
import matplotlib.pyplot as plt
LEN = 10000
data = []
ser = serial.Serial('COM3', baudrate=2000000)
for i in range(LEN):
 try:
 data.append(int(ser.readline()))
 except:
 pass
ser.close()
# %% Plot data
plt.figure(figsize=(6, 4))
plt.plot(data)
plt.savefig('data.png')

import serial
import matplotlib.pyplot as plt
LEN = 10000
data = []
ser = serial.Serial('COM3', baudrate=2000000)
for i in range(LEN):
 try:
 data.append(int(ser.readline()))
 except:
 pass
ser.close()
# %% Plot data
plt.figure(figsize=(6, 4))
plt.plot(data)
plt.savefig('data.png')

Here is what I got:

Plot of data

Edit below

Chris mentioned a good point that it might be the high baud rate of 2,000,000 causing the instability. I did think about that when I first ran into this, but then I did a little trick: adding a sinusoid into the constant. If I do that, the weird spiking goes away! I think it indicate that this is not a high baud rate issue... Is it?

Code:

void setup() {
 Serial.begin(2000000);
}
void loop() {
 int val = 234;
 val += int(512 * (sin(float(millis()) * 0.01) + 1)) * 0.1;
 Serial.println(val);
}

void setup() {
 Serial.begin(2000000);
}
void loop() {
 int val = 234;
 val += int(512 * (sin(float(millis()) * 0.01) + 1)) * 0.1;
 Serial.println(val);
}

Output:

Output

I am using Arduino Uno Rev 3, and according to this link we can achieve 2000000 baud rate.

This problem can be easily repeated by the following code:

void setup() {
 Serial.begin(2000000);
}
void loop() {
 int val = 234;
 Serial.println(val);
}

I am using the serial-USB cable. To read the data, I used Python pyserial (< 20 lines of code including empty lines and import lines):

import serial
import matplotlib.pyplot as plt
LEN = 10000
data = []
ser = serial.Serial('COM3', baudrate=2000000)
for i in range(LEN):
 try:
 data.append(int(ser.readline()))
 except:
 pass
ser.close()
# %% Plot data
plt.figure(figsize=(6, 4))
plt.plot(data)
plt.savefig('data.png')

Here is what I got:

Plot of data

Edit below

Code:

void setup() {
 Serial.begin(2000000);
}
void loop() {
 int val = 234;
 val += int(512 * (sin(float(millis()) * 0.01) + 1)) * 0.1;
 Serial.println(val);
}

Output:

Output

I am using Arduino Uno Rev 3, and according to this link we can achieve 2000000 baud rate.

This problem can be easily repeated by the following code:

void setup() {
 Serial.begin(2000000);
}
void loop() {
 int val = 234;
 Serial.println(val);
}

I am using the serial-USB cable. To read the data, I used Python pyserial (< 20 lines of code including empty lines and import lines):

import serial
import matplotlib.pyplot as plt
LEN = 10000
data = []
ser = serial.Serial('COM3', baudrate=2000000)
for i in range(LEN):
 try:
 data.append(int(ser.readline()))
 except:
 pass
ser.close()
# %% Plot data
plt.figure(figsize=(6, 4))
plt.plot(data)
plt.savefig('data.png')

Here is what I got:

Plot of data

Edit below

Code:

void setup() {
 Serial.begin(2000000);
}
void loop() {
 int val = 234;
 val += int(512 * (sin(float(millis()) * 0.01) + 1)) * 0.1;
 Serial.println(val);
}

Output:

Output

arduino-uno serial

replaced http://arduino.stackexchange.com/ with https://arduino.stackexchange.com/

Source Link

edited Apr 13, 2017 at 12:50

Community Bot

edited Apr 13, 2017 at 12:50

Community Bot

I am using Arduino Uno Rev 3, and according to this link this link we can achieve 2000000 baud rate.

This problem can be easily repeated by the following code:

void setup() {
 Serial.begin(2000000);
}
void loop() {
 int val = 234;
 Serial.println(val);
}

I am using the serial-USB cable. To read the data, I used Python pyserial (< 20 lines of code including empty lines and import lines):

import serial
import matplotlib.pyplot as plt
LEN = 10000
data = []
ser = serial.Serial('COM3', baudrate=2000000)
for i in range(LEN):
 try:
 data.append(int(ser.readline()))
 except:
 pass
ser.close()
# %% Plot data
plt.figure(figsize=(6, 4))
plt.plot(data)
plt.savefig('data.png')

Here is what I got:

Plot of data

Edit below

Code:

void setup() {
 Serial.begin(2000000);
}
void loop() {
 int val = 234;
 val += int(512 * (sin(float(millis()) * 0.01) + 1)) * 0.1;
 Serial.println(val);
}

Output:

Output

I am using Arduino Uno Rev 3, and according to this link we can achieve 2000000 baud rate.

This problem can be easily repeated by the following code:

void setup() {
 Serial.begin(2000000);
}
void loop() {
 int val = 234;
 Serial.println(val);
}

I am using the serial-USB cable. To read the data, I used Python pyserial (< 20 lines of code including empty lines and import lines):

import serial
import matplotlib.pyplot as plt
LEN = 10000
data = []
ser = serial.Serial('COM3', baudrate=2000000)
for i in range(LEN):
 try:
 data.append(int(ser.readline()))
 except:
 pass
ser.close()
# %% Plot data
plt.figure(figsize=(6, 4))
plt.plot(data)
plt.savefig('data.png')

Here is what I got:

Plot of data

Edit below

Code:

void setup() {
 Serial.begin(2000000);
}
void loop() {
 int val = 234;
 val += int(512 * (sin(float(millis()) * 0.01) + 1)) * 0.1;
 Serial.println(val);
}

Output:

Output

I am using Arduino Uno Rev 3, and according to this link we can achieve 2000000 baud rate.

This problem can be easily repeated by the following code:

void setup() {
 Serial.begin(2000000);
}
void loop() {
 int val = 234;
 Serial.println(val);
}

I am using the serial-USB cable. To read the data, I used Python pyserial (< 20 lines of code including empty lines and import lines):

import serial
import matplotlib.pyplot as plt
LEN = 10000
data = []
ser = serial.Serial('COM3', baudrate=2000000)
for i in range(LEN):
 try:
 data.append(int(ser.readline()))
 except:
 pass
ser.close()
# %% Plot data
plt.figure(figsize=(6, 4))
plt.plot(data)
plt.savefig('data.png')

Here is what I got:

Plot of data

Edit below

Code:

void setup() {
 Serial.begin(2000000);
}
void loop() {
 int val = 234;
 val += int(512 * (sin(float(millis()) * 0.01) + 1)) * 0.1;
 Serial.println(val);
}

Output:

Output

deleted 41 characters in body

Source Link

edited Apr 17, 2015 at 18:43

Shawn Wang

edited Apr 17, 2015 at 18:43

Shawn Wang

I am using Arduino Uno Rev 3, and according to this link we can achieve 2000000 baud rate.

This problem can be easily repeated by the following code:

void setup() {
 Serial.begin(2000000);
}
void loop() {
 int val = 234;
 Serial.println(val);
}

I am using the serial-USB cable. To read the data, I used Python pyserial (< 20 lines of code including empty lines and import lines):

import serial
import matplotlib.pyplot as plt
LEN = 10000
data = []
ser = serial.Serial('COM3', baudrate=2000000)
for i in range(LEN):
 try:
 data.append(int(ser.readline()))
 except:
 pass
ser.close()
# %% Plot data
plt.figure(figsize=(6, 4))
plt.plot(data)
plt.savefig('data.png')

Here is what I got:

Plot of data

Edit below

Code:

void setup() {
 Serial.begin(2000000);
}
void loop() {
 int val = 234;
 val += int(512 * (sin(float(millis()) * 0.01) + 1)) * 0.011;
 Serial.println(val);
}

Output:

(Place holder Not by Arduino right now, will update in 12 hours - but I do think it'll fix it)Output

I am using Arduino Uno Rev 3, and according to this link we can achieve 2000000 baud rate.

This problem can be easily repeated by the following code:

void setup() {
 Serial.begin(2000000);
}
void loop() {
 int val = 234;
 Serial.println(val);
}

I am using the serial-USB cable. To read the data, I used Python pyserial (< 20 lines of code including empty lines and import lines):

import serial
import matplotlib.pyplot as plt
LEN = 10000
data = []
ser = serial.Serial('COM3', baudrate=2000000)
for i in range(LEN):
 try:
 data.append(int(ser.readline()))
 except:
 pass
ser.close()
# %% Plot data
plt.figure(figsize=(6, 4))
plt.plot(data)
plt.savefig('data.png')

Here is what I got:

Plot of data

Edit below

Code:

void setup() {
 Serial.begin(2000000);
}
void loop() {
 int val = 234;
 val += int(512 * (sin(float(millis()) * 0.01) + 1)) * 0.01
 Serial.println(val);
}

Output:

(Place holder Not by Arduino right now, will update in 12 hours - but I do think it'll fix it)

I am using Arduino Uno Rev 3, and according to this link we can achieve 2000000 baud rate.

This problem can be easily repeated by the following code:

void setup() {
 Serial.begin(2000000);
}
void loop() {
 int val = 234;
 Serial.println(val);
}

I am using the serial-USB cable. To read the data, I used Python pyserial (< 20 lines of code including empty lines and import lines):

import serial
import matplotlib.pyplot as plt
LEN = 10000
data = []
ser = serial.Serial('COM3', baudrate=2000000)
for i in range(LEN):
 try:
 data.append(int(ser.readline()))
 except:
 pass
ser.close()
# %% Plot data
plt.figure(figsize=(6, 4))
plt.plot(data)
plt.savefig('data.png')

Here is what I got:

Plot of data

Edit below

Code:

void setup() {
 Serial.begin(2000000);
}
void loop() {
 int val = 234;
 val += int(512 * (sin(float(millis()) * 0.01) + 1)) * 0.1;
 Serial.println(val);
}

Output:

Output