After having major issues due to knowing nothing about coding, I eventually got round to reading the reference files and working out how to do it.
The project was to light up a red green and blue LED using a keyboard and typing in RGB values. I created two versions of the code, one to use serial through the pc and one just to work on its own.
/* RGB Keyboard no serial v3
*
* Board may need resetting after turning on, not sure why but all 3 LEDs occasionally light up full when a key is pressed after turn on.
*
* Robin Whitfield
* 25th June 2009
*
* Approx 2150 bytes
*/
#include "binary.h"
typedef uint8_t boolean;
typedef uint8_t byte;
#include <PS2Keyboard.h>
#define DATA_PIN 4 // Define keyboard data pin
PS2Keyboard keyboard;
int LEDR = 11; // Assign Red LED pin
int LEDG = 10; // Assign Green LED pin
int LEDB = 9; // Assign Blue LED pin
int r = 0; // Zero Red value
int g = 0; // Zero Green value
int b = 0; // Zero Blue value
void setup() {
pinMode(LEDR, OUTPUT); // Set Red LED pin as output
pinMode(LEDG, OUTPUT); // Set Green LED pin as output
pinMode(LEDB, OUTPUT); // Set Blue LED pin as output
keyboard.begin(DATA_PIN); // Set up keyboard
}
int keyIn(){
int key1 = 0; // Zero value for key1
int key2 = 0; // Zero value for key2
int key3 = 0; // Zero value for key3
while(!keyboard.available()) {} // When keyboard is available:
key1 = keyboard.read() -'0'; // Read data and assign to key1
while(!keyboard.available()) {} // When keyboard is available
key2 = keyboard.read() -'0'; // Read data and assign to key2
while(!keyboard.available()) {} // When keyboard is available
key3 = keyboard.read() -'0'; // Read data and assign to key3
return ((key1*100)+(key2*10)+key3); // Turn key1, key2 and key3 into intended 3 digit number
}
void loop() {
r = keyIn(); // run 'keyIn' to get Red value
g = keyIn(); // run 'keyIn' to get Green value
b = keyIn(); // run 'keyIn' to get Blue value
r=min(r, 255); // Assign value to 255 if greater
g=min(g, 255); // Assign value to 255 if greater
b=min(b, 255); // Assign value to 255 if greater
analogWrite(LEDR, r); // Write value to Red LED
analogWrite(LEDG, g); // Write value to Blue LED
analogWrite(LEDB, b); // Write value to Green LED
}
Serial version:
/* RGB Keyboard Serial v2
*
* Robin Whitfield
* 25th June 2009
*
* Approx 3276 bytes
*/
#include "binary.h"
typedef uint8_t boolean;
typedef uint8_t byte;
#include <PS2Keyboard.h>
#define DATA_PIN 4
PS2Keyboard keyboard;
int LEDR = 11;
int LEDG = 10;
int LEDB = 9;
int r = 0;
int g = 0;
int b = 0;
void setup() {
pinMode(LEDR, OUTPUT);
pinMode(LEDG, OUTPUT);
pinMode(LEDB, OUTPUT);
Serial.begin(9600);
Serial.println("RGB Colour Mixer");
keyboard.begin(DATA_PIN);
}
int keyIn(){
int key1 = 0;
int key2 = 0;
int key3 = 0;
while(!keyboard.available()) {}
key1 = keyboard.read() -'0';
Serial.print("*");
while(!keyboard.available()) {}
key2 = keyboard.read() -'0';
Serial.print("*");
while(!keyboard.available()) {}
key3 = keyboard.read() -'0';
Serial.println("*");
return ((key1*100)+(key2*10)+key3);
}
void loop() {
Serial.println("Type 'R' value now:");
r = keyIn();
Serial.println("Type 'G' value now:");
g = keyIn();
Serial.println("Type 'B' value now:");
b = keyIn();
r=min(r, 255);
g=min(g, 255);
b=min(b, 255);
Serial.println();
Serial.print("R =");
Serial.println(r);
analogWrite(LEDR, r);
Serial.print("G =");
Serial.println(g);
analogWrite(LEDG, g);
Serial.print("B =");
Serial.println(b);
analogWrite(LEDB, b);
Serial.println();
Serial.println("----------------------------");
Serial.println();
}
I think that this code is the smallest it can get but if anyone can suggest improvements then I'll change it...
I am going to connect it to a BlinkM Maxm once my Sparkfun order arrives...
I am not currently very familiar with using 'i' so that's why I didn't try anything with that for fear of it not working, I will test it in a mo...
Anything to make the serial one smaller because that's the one that is taking up the most space or should I just use that code as the base and add the serial commands in...
I was expecting a package with my BlinkM MaxM in today and I got a package but it was from libelium with my microSD module instead (and it came from Spain and it was still first!). I haven't been that impressed with Sparkfun so far as I ordered the stuff a few days before the board from libelium and haven't had any news (but it has been dispatched so I suppose it is the delivery rather than sparkfun themselves...
for (i = 0 ; i < N_LEDS; ++i)[{
level = keyIn();[/quote] You also managed to put in a [ when it should have been { Once I had defined 'i' and changed the bracket it then told me that level had not been defined... As I said, I don't really know enough about coding to sort that in the best way, I had a fiddle but didn't get to finish it... Thanks anyway, Mowcius
I got it slightly smaller by doing int pins and int levels rather than byte pins and byte levels and a few other things...
That also solved issues with when I put in values larger than 255... It would set it as random lower values before...
Here is the updated code:
/* Keyboard RGB Mixer
*
* Approx 1770 bytes
*
* Created 26th June 2009
* Modified 27th June
* 28th June
*/
#include "binary.h"
typedef uint8_t boolean;
typedef uint8_t byte;
#include <PS2Keyboard.h>
#define DATA_PIN 4 // Define keyboard data pin
#define N_LEDS 3 // Define 3 LEDs
const int LEDpins[N_LEDS] = {11, 10, 9}; // LEDs on pins 9, 10 and 11
int levels[N_LEDS];
PS2Keyboard keyboard;
void setup() {
for (int i = 0; i < N_LEDS; ++i) {
pinMode(LEDpins[i], OUTPUT); // Set LED pins as output
}
keyboard.begin(DATA_PIN); // Set up keyboard
}
int keyIn(){
byte key[3];
for (int i = 0; i < N_LEDS; ++i) {
while(!keyboard.available()) {} // When keyboard is not available {} do nothing... When it is available:
key[i] = keyboard.read() -'0'; // Read data and assign to key[i]
}
return ((key[0]*100)+(key[1]*10)+key[2]); // Turn key0, key1 and key2 into intended 3 digit number
}
void loop() {
for (int i = 0 ; i < N_LEDS; ++i){
levels[i] = keyIn();
levels[i] = min(levels[i], 255); // Assign value to 255 if greater
analogWrite(LEDpins[i], levels[i]); // Write the value to LED
}
}
And here is my serial version:
/* Keyboard RGB Mixer Serial
*
* Approx 3274 bytes
*
* Created 28th June
* Modified
*/
#include "binary.h"
typedef uint8_t boolean;
typedef uint8_t byte;
#include <PS2Keyboard.h>
#define DATA_PIN 4 // Define keyboard data pin
#define N_LEDS 3 // Define 3 LEDs
const int LEDpins[N_LEDS] = {11, 10, 9}; // LEDs on pins 9, 10 and 11
int levels[N_LEDS];
PS2Keyboard keyboard;
void setup() {
for (int i = 0; i < N_LEDS; ++i) {
pinMode(LEDpins[i], OUTPUT); // Set LED pins as output
}
Serial.begin(115200);
Serial.println("Keyboard RGB Mixer");
keyboard.begin(DATA_PIN); // Set up keyboard
}
int keyIn(){
byte key[3];
for (int i = 0; i < N_LEDS; ++i) {
while(!keyboard.available()) {} // When keyboard is not available {} do nothing... When it is available:
key[i] = keyboard.read() -'0'; // Read data and assign to key[i]
}
return ((key[0]*100)+(key[1]*10)+key[2]); // Turn key0, key1 and key2 into intended 3 digit number
}
void loop(){
for (int i = 0 ; i < N_LEDS; ++i){
if (i == 0)
{
Serial.println();
Serial.println("---------------------");
Serial.println("Type 'R' value now:");
}
else if (i == 1)
{
Serial.println("Type 'G' value now:");
}
else
{
Serial.println("Type 'B' value now:");
}
levels[i] = keyIn();
levels[i] = min(levels[i], 255); // Assign value to 255 if greater
analogWrite(LEDpins[i], levels[i]); // Write the value to LED
Serial.println(levels[i], DEC);
}
}
I got it slightly smaller by doing int pins and int levels rather than byte pins and byte levels and a few other things...
That also solved issues with when I put in values larger than 255... It would set it as random lower values before...
ints are two bytes, a byte is just a byte.
But, as you've experienced, the byte overflows at 255 (because 2^8 == 256), so it is insufficient if you want to store values larger than 255 [or below zero].
Ok, I was not aware of what an int is classed as...
Thanks for clearing that up. I have now received my order containing a BlinkM MaxM (after paying a £13.50 surcharge of UK VAT when it entered the UK) so I will hopefully post up any changes/ some photos/videos in a few days...
