So, to make it work, connect the anode (positive) pins (from breadboard #1) to either a transistor or LED (depending on whether it is a column wire or a row wire). So, if you send an “A” through a Serial connection, G1 will go off (while all other green LEDs are on) and R6 will come on (while all other red LEDs are off). You may insert them the other way around and it will make no difference. 2) Next, insert your LEDs into “Row B”. With each subsequent operation, the arrangement of the words and numbers changes. After the "button push", all pins are set low (so that there are no circuits messing up the display on the Speak & Read). (This makes things neater and easier to attach to the Mega and output device.). Then, and only then, can current flow from the COLLECTOR to the EMITTER. Notice in the table, the rule inside the grey box at the top that is +3. This allows data (text) to be sent from the Nano to the Mega. If the connections to the Speak & Read were to mimic the LED matrix, the display on the Speak & Read gets messed up. Every input-output table works like a machine that follows a rule. Insert each of your 13 resistors into “Row A” on your breadboard. I only know that it works. The Arduino code has been loaded onto a separate Arduino (in this case a Nano). For more information on transistors visit: 4) Bridge positive and negative rails to each side of the breadboard. (Ahhhhh…..the wonders of the LED. They can turn things on and off. 5) Working from left to right, the base of each transistor is connected to a pin on the Mega as follows: 6) Load some test code. Possible outputs include posting to a website (with an ESP8266), sound effects, lights, and games. This is called “charlieplexing” and is used in those big LED displays. How cool is that? If we were to label the green LEDs G1, G2, G3, G4, G5 and the red LEDs R1, R2, R3, R4, R5, R6, R7 and R8, the number of all possible combinations of “OFF Green & ON Red” can be more easily understood. Thank you for being the very first response to my very first Instructable! Upon opening it up and examining the circuitry, I discovered that it had a keyboard matrix that could be controlled by 13 wires. When code on the Arduino switches a pin to HIGH (ON), the middle pin (called the BASE) receives a small amount of current from the Arduino. Here's some test code to load onto your Mega. About: The Instructables website has taught me a lot about technology. With each subsequent operation, the arrangement of the words and numbers changes. This Arduino code is based on Budd Churchward’s ”Teaching Arduino to Copy Morse Code”, but you can use any code or device that can output text to the serial port on the Mega. Share it with us! 1) Start with your resistors. While there are many ways to show division by 2, this machine is a bit … This part of the circuit is less understood by me. So, now I have an Input/Output Machine that I can use to practice my Morse coding skills while playing a retro game on a Speak & Read toy. Reasoning: Machine Input-Output Questions — Set 34. Finally, a wire is connected between the Arduino Mega and the Nano (TX on the Nano to RX2 on the Mega). 3 years ago. It probably has a similar "old school" voice technology. I believe the possibilities of the I/O Machine are limited only by your imagination! 4) Share a negative (ground) rail with the first breadboard. “Good functions, unlike good literature, have predictable endings.” (Calculus for Dummies, P. 48), Participated in the First Time Author Contest.

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