Errata

Figure B-1 refers to transistor TIP102. It should be TIP120.

Note from the Author or Editor:
The TIP102 is often used instead of a TIP120.
To avoid confusion, the text on page 647 should be changed from:
The TIP120 transistor is a popular choice ...
to:
The TIP120 transistor or the more recent TIP102 are popular choices ..

Recipe 8.12 on Bipolar steppers has a typo in the label for the L298 H-bridge figure. The description for Figure 8-16 should be changed from:
Unipolar stepper with L298
to:
Bipolar stepper with L298

int blinkDelay; // blink rate determined by this variablevoid loop()
{
if( Serial.available())
{
blinkRate = Serial.parseInt();
}
blink();
}

should be

int blinkDelay; // blink rate determined by this variable
void loop()
{
if( Serial.available())
{
blinkRate = Serial.parseInt();
}
blink();
}

Note from the Author or Editor:
The fragment at the bottom of age 44, change from:

int blinkDelay; // blink rate determined by this variable
{
if( Serial.available())
{
blinkRate = Serial.parseInt();
}

blink();
}
}

to:

void loop()
{
if( Serial.available())
{
blinkRate = Serial.parseInt();
}
blink();
}

in the sketch itself you have the line:

if( mV > INTERVAL * TABLE_ENTRIES-1 )

when discussing the sketch you have it written as:

if( mV > INTERVAL * TABLE_ENTRIES )


later in the sketch you have:

return distance[index] - ((distance[index] - distance[index+1]) * frac);

when discussing it you have it written:

return distance[index] + (distance[index]* (frac / interval));


...so in each case, which is correct??? i have my guess, but looking for some verification. thanks.

Note from the Author or Editor:
There are typos in the discussion for Recipe 6.5. The sketch listing in the book and the code download are correct.

on page 195 change:
if( mV > INTERVAL * TABLE_ENTRIES )
to:
if( mV > INTERVAL * TABLE_ENTRIES-1 )

change:
return distance[index] + (distance[index]* (frac / interval))
to:
return distance[index] - ((distance[index] - distance[index+1]) * frac);

Author refers to a data variable that is supposedly in the code example called "blinkRate." There is NO SUCH variable in the code example. I believe "blinkRate" should be deleted and replaced with "blinkDelay."

Note from the Author or Editor:
The fragment should use the variable blinkDelay instead of blinkRate

Demo code has "Serial.println("for(j=0; j < 4; j++ )");

and output shown as:

for(j=0; i < 4; i++)

it should be:
for(j=0; j < 4; j++)

The wrong one has a lower case "I" and the right one has a lower case "J" on screen the difference between a i and a j can be hard to spot depending on your font.

Note from the Author or Editor:
The code is correct but the output listing should be changed from:
for(j=0; i < 4; i++)
to:
for(j=0; j < 4; j++)

To be consistent with the previous code in recipe 3.14 and the code in recipe 3.15, change the int variables:

loword to loWord
hiword to hiWord

Note from the Author or Editor:
In the discussion of Recipe 3.14 on page 86, the lower case 'w' in the variables should be upper case
change:
loword = lowWord(longValue);
hiword = highWord(longValue);
to:
loWord = lowWord(longValue);
hiWord = highWord(longValue);

hiWord should be highWord (i.e. These are macro expressions: highWord performs ...)

Note from the Author or Editor:
In the discussion of Recipe 3.14 change:
"These are macro expressions: hiWord performs a 16-bit shift operation ..."
to:
"These are macro expressions: highWord performs a 16-bit shift operation ..."

"t" missing from the word "to".

Note from the Author or Editor:
on page 35, change :
"Copies up o len characters of the String to the supplied buffer"

to"

Copies up to len characters of the String to the supplied buffer

Incorrect reference: Snubber diodes are used to prevent that by conducting
the voltage spikes to ground. Figure A-1 in Appendix A shows an example of a snubber
diode used to suppress voltage spikes when driving a motor.

Figure A-1 in Appendix A should corrected to read Figure B-1 in Appendix B.

Note from the Author or Editor:
In Appendix C page 653, the reference to Figure A-1 in Appendix A should read:
Figure B-1 in Appendix B

The ?Port? column lists the physical port used for the pin?see Recipe 18.11 for information
on how to set a pin by writing directly to a port. The introduction to Chapter
18 contains more details on timer usage. The table shows:
? USART RX is hardware serial receive
? USART RX is hardware serial transmit

In the last line, the string "USART RX" should be changed to "USART TX."

Note from the Author or Editor:
The table is correct, however the text in bullet points above the table should be changed from:
? USART RX is hardware serial transmit
to:
? USART TX is hardware serial transmit

Where the page shows what the results of the last two lines of added code should be (text3 = text1 + " and more"; Serial.println(text3);) the result says it should show

"This is a string with more text and more"

In the Serial Monitor but the actual result should show

"This string has more text and more"

Note from the Author or Editor:
Change the text:
"This is a string with more text and more"
to:
"This string has more text and more"

Please label the capacitors in the diagram as 0.1?f. The capacitors are located in the following places:

directly above and to the right of the pin labeled 3

directly above and to the left of the pin labeled 6

directly above and to the right of the pin labeled 11

directly above and to the left of the pin labeled 14

Note from the Author or Editor:
Please label the capacitors in the diagram as 0.1?f. The capacitors are located in the following places:

directly above and to the right of the pin labeled 3
directly above and to the left of the pin labeled 6
directly above and to the right of the pin labeled 11
directly above and to the left of the pin labeled 14

The online parts list has has these parts correctly identified

Please label the capacitors in the diagram as 0.1?f. The capacitors are located in the following places:

directly above and to the right of the pin labeled 3

directly above and to the left of the pin labeled 6

Note from the Author or Editor:
Please label the capacitors in the diagram as 0.1?f. The capacitors are located in the following places:

directly above and to the right of the pin labeled 3
directly above and to the left of the pin labeled 6

The online parts list has has these parts correctly identified

Please label the capacitors in the diagram as 0.1?f. The capacitors are located in the following places:

directly above and to the right of the pin labeled 3

directly above and to the left of the pin labeled 6

directly above and to the right of the pin labeled 11

directly above and to the left of the pin labeled 14

Note from the Author or Editor:
Please label the capacitors in the diagram as 0.1?f. The capacitors are located in the following places:

directly above and to the right of the pin labeled 3
directly above and to the left of the pin labeled 6
directly above and to the right of the pin labeled 11


The online parts list has has these parts correctly identified
directly above and to the left of the pin labeled 14

parseInt returns an integer value; if you want to get a floating-point value, use parseFloat instead:

float floatResult = client.parseInt();
Serial.println(floatResult);

In the first line of code, client.parseInt() function should be changed to parseFloat() function because we want to get a floating-point value. Right?

Note from the Author or Editor:
In Recipe 15.4 , the discussion text on page 505 should be changed from:
float floatResult = client.parseInt();
to
float floatResult = client.parseFloat();

Looks like you are using booleen and '&&' instead of bitwise and '&' to extract the lower byte of a variable. I am new with arduino so the mistake may be on my end.

Note from the Author or Editor:
In Recipe 4.6 on page 116
change:
longValue && 0xFFFF
to:
longValue & 0xFFFF

and change:
change:
value && 0xFFFF
to:
value & 0xFFFF

Insert the following to the See Also section on Page 118 before the text: "Also, check ..."
See Recipe 3.15 for more on handling high and low bytes.

A comma is missing from an array initializer.

In the code example

byte ip[] = { 192, 168 1, 177 };

add a comma after the number 168.

Note from the Author or Editor:
The solution code in the book and in the download are correct so this recipe as published will compile and run without error. However, a comma is missing from the discussion text explaining the code -
change:
byte ip[] = { 192, 168 1, 177 };
to:
byte ip[] = { 192, 168, 1, 177 };