While considering replying to some poster with a problem,
I was looking through the official examples for a basic sketch to do the inverse of these examples:
Maybe some serial communication to control a LED, something like:
const int LedPin=3;
void setup() {
Serial.begin(115200);
Serial.println("Enter characters + or - to control a LED.");
pinMode(LedPin, OUTPUT);
}
void loop() {
if (Serial.available()) {
int ch = Serial.read();
if (ch == '+') {
Serial.print("On ");
digitalWrite(LedPin, HIGH);
}
else if (ch == '-') {
Serial.print("Off ");
digitalWrite(LedPin, LOW);
}
}
}
Most of the "Communications" examples on https://docs.arduino.cc/built-in-examples/ look confusingly processing based:
Here's the innocuously named Dimmer:
/*
Dimmer
Demonstrates sending data from the computer to the Arduino board, in this case
to control the brightness of an LED. The data is sent in individual bytes,
each of which ranges from 0 to 255. Arduino reads these bytes and uses them to
set the brightness of the LED.
The circuit:
- LED attached from digital pin 9 to ground.
- Serial connection to Processing, Max/MSP, or another serial application
created 2006
by David A. Mellis
modified 30 Aug 2011
by Tom Igoe and Scott Fitzgerald
This example code is in the public domain.
https://www.arduino.cc/en/Tutorial/Dimmer
*/
const int ledPin = 9; // the pin that the LED is attached to
void setup() {
// initialize the serial communication:
Serial.begin(9600);
// initialize the ledPin as an output:
pinMode(ledPin, OUTPUT);
}
void loop() {
byte brightness;
// check if data has been sent from the computer:
if (Serial.available()) {
// read the most recent byte (which will be from 0 to 255):
brightness = Serial.read();
// set the brightness of the LED:
analogWrite(ledPin, brightness);
}
}
/* Processing code for this example
// Dimmer - sends bytes over a serial port
// by David A. Mellis
// This example code is in the public domain.
import processing.serial.*;
Serial port;
void setup() {
size(256, 150);
println("Available serial ports:");
// if using Processing 2.1 or later, use Serial.printArray()
println(Serial.list());
// Uses the first port in this list (number 0). Change this to select the port
// corresponding to your Arduino board. The last parameter (e.g. 9600) is the
// speed of the communication. It has to correspond to the value passed to
// Serial.begin() in your Arduino sketch.
port = new Serial(this, Serial.list()[0], 9600);
// If you know the name of the port used by the Arduino board, you can specify
// it directly like this.
//port = new Serial(this, "COM1", 9600);
}
void draw() {
// draw a gradient from black to white
for (int i = 0; i < 256; i++) {
stroke(i);
line(i, 0, i, 150);
}
// write the current X-position of the mouse to the serial port as
// a single byte
port.write(mouseX);
}
*/
/* Max/MSP v5 patch for this example
----------begin_max5_patcher----------
1008.3ocuXszaiaCD9r8uhA5rqAeHIa0aAMaAVf1S6hdoYQAsDiL6JQZHQ2M
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ymEUytKuh05TKJWUWyk5nE9eSyuS6jesvHu4F4MxOuUzB6X57sPKWVzBLXiP
xZtGj6q2vafaaT0.BzJfjj.p8ZPukazsQvpfcpFs8mXR3plh8BoBxURIOWyK
rxspZ0YI.eTCEh5Vqp+wGtFXZMKe6CZc3yWZwTdCmYW.BBkdiby8v0r+ST.W
sD9SdUkn8FYspPbqvnBNFtZWiUyLmleJWo0vuKzeuj2vpJLaWA7YiE7wREui
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AdOEAksDs.RRrOoww1Arc.9RvN2J9tamwjkcqknvAE0l+8WnjHqreNet8whK
z6mukIK4d+Xknv3jstvJs8EirMMhxsZIusET25jXbX8xczIl5xPVxhPcTGFu
xNDu9rXtUCg37g9Q8Yc+EuofIYmg8QdkPCrOnXsaHwYs3rWx9PGsO+pqueG2
uNQBqWFh1X7qQG+3.VHcHrfO1nyR2TlqpTM9MDsLKNCQVz6KO.+Sfc5j1Ykj
jzkn2jwNDRP7LVb3d9LtoWBAOnvB92Le6yRmZ4UF7YpQhiFi7A5Ka8zXhKdA
4r9TRGG7V4COiSbAJKdXrWNhhF0hNUh7uBa4Mba0l7JUK+omjDMwkSn95Izr
TOwkdp7W.oPRmNRQsiKeu4j3CkfVgt.NYPEYqMGvvJ48vIlPiyzrIuZskWIS
xGJPcmPiWOfLodybH3wjPbMYwlbFIMNHPHFOtLBNaLSa9sGk1TxMzCX5KTa6
WIH2ocxSdngM0QPqFRxyPHFsprrhGc9Gy9xoBjz0NWdR2yW9DUa2F85jG2v9
FgTO4Q8qiC7fzzQNpmNpsY3BrYPVJBMJQ1uVmoItRhw9NrVGO3NMNzYZ+zS7
3WTvTOnUydG5kHMKLqAOjTe7fN2bGSxOZDkMrBrGQ9J1gONBEy0k4gVo8qHc
cxmfxVihWz6a3yqY9NazzUYkua9UnynadOtogW.JfsVGRVNEbWF8I+eHtcwJ
+wLXqZeSdWLo+FQF6731Tva0BISKTx.cLwmgJsUTTvkg1YsnXmxDge.CDR7x
D6YmX6fMznaF7kdczmJXwm.XSOOrdoHhNA7GMiZYLZZR.+4lconMaJP6JOZ8
ftCs1YWHZI3o.sIXezX5ihMSuXzZtk3ai1mXRSczoCS32hAydeyXNEu5SHyS
xqZqbd3ZLdera1iPqYxOm++v7SUSz
-----------end_max5_patcher-----------
*/
Is there a basic AnalogWriteSerial-like example such as this?
const int LedPin = 3;
void setup() {
Serial.begin(115200);
Serial.println("Enter characters 0 through 9 to control a LED with analogWrite().");
pinMode(LedPin, OUTPUT);
}
void loop() {
if (Serial.available()) {
int ch = Serial.read();
switch (ch) {
case '0': analogWrite(LedPin, 0); break;
case '1': analogWrite(LedPin, 1); break;
case '2': analogWrite(LedPin, 2); break;
case '3': analogWrite(LedPin, 4); break;
case '4': analogWrite(LedPin, 8); break;
case '5': analogWrite(LedPin, 16); break;
case '6': analogWrite(LedPin, 32); break;
case '7': analogWrite(LedPin, 64); break;
case '8': analogWrite(LedPin, 128); break;
case '9': analogWrite(LedPin, 255); break;
default:
; // ignore other characters
}
}
}
https://wokwi.com/projects/395348450321670145
Am I missing an obvious built-in example?
