Hello and thanks to one and all for your suggestions.
Grumpy Mike: I read the entire webpage “Read this before posting a programming question” and thought that was the “sticky” you were referring to. I evidently overlooked “How To Use This Forum” but have gone back and read it.
Thanks for the tip about posting pictures. I clicked on the “Choose File” button just below “Additional Options”, clicked on a picture of the board setup I used today in IPAD Photos and – voila ! – Photo1.
I tried the “Blink” sketch for each of the three colors of the RGB LED. I used the same UNO board, same
1.0.1 IDE, same RGB LED, same 220 ohm resistors and same wires. The short white wire in the photo goes to the Green led.
The L/13 led blinked when I connect the USB cable (power) to the board.
When I uploaded the “Blink” sketch, L/13, TX and RX leds all blinked at least once but only L/13 continued blinking.
I put the RGB LED back, connected the cathode (long lead2 to GND) and connected one lead (Red) to Pin 13 through a 220 ohm resistor. I compiled the “Blink” sketch and the RGB red led and L/13 led blinked as soon as I connected the USB cable and continued blinking before and during compiling and during the initial stage of uploading. It looked like the RGB red led and L/13 led stopped blinking momentarily during the final stage of uploading (while the TX and RX leds blinked) and then the RGB red led and L/13 continued blinking. I got the same results for the Green and Blue leds (separately)
Thanks for the clue about “newline”.
Yes, that’s the ASCII sketch I’ve been using.
Since this is the first time I did an Arduino project using the Serial Monitor I did a simple serial monitor project (4.1) from Arduino Cookbook. The Serial Monitor worked as expected. TX blinked once as each new line printed out automatically.
I re-wired the UNO board for the “Read ASCII string” sketch using the same RGB LED, 220 ohm resistors and wires. I uploaded the code and opened the Serial Monitor.
I left Autoscroll and the 9600 baud as is. I tried a bunch of stuff that did not result in the display of hex code in the lower box of the Serial Monitor with any of the line options. I did some more homework, re-read the Arduino project and typed in their three numbers, first with quotation marks (as shown in the Arduino project and then without. As soon as I typed in the three numbers without quotation marks, the hex code appeared in the lower box and the RGB LED turned ON and stayed on until I typed in another set of three numbers.
Set the line option to “Newline”.
Type three numbers between 0 and 255 (each separated by a comma) in the top box of the Serial Monitor – no quotation marks.
Click the SEND button to the right of the top box.
Take photos and write a follow-up post to the Forum.
And say thanks again to everyone who helped me learn a lot more than I knew a few days. I hope our paths cross again.