In Particle c$++$ for a photon device

Part II: Board Assembly

Add a yellow, green and blue LED to the circuit, connected to pins D$2,$ D$1$ and D$0,$ respectively.

Consider the $4$ LEDs to represent a $4-$bit unsigned type, where a lit LED represents a $1,$ an unlit LED a $0.$ Assume that the least significant bit is at right $($blue$),$ the most significant bit at left $($red$).$

Part III: Projects

These will be done as separate projects.

Write and flash the firmware to count up from $0$ to $15,$ and then down from $14$ to $0,$ ad infinitum. The count will be displayed, in base $2,$ by lighting up the appropriate LEDs. For example, when count is $0,$ all LEDs are off; when count is $12(0$b$1100),$ the red and orange LEDs should be lit; the green and blue LEDs should be unlit. Also print out the count to the console as it is being displayed, one number per line.

Write and flash the firmware to continuously scan for a hex digit input at the command line $(0,1,$dots$9,A,B,C,D,E,F).$ Display the binary equivalent of that digit, in the LEDs, for $1$ second $($and then turn off all leds while you continue scanning$).$ Otherwise, display an error message $-$ flash all $4$ LEDs on simultaneously for $1$ second and then turn them off.

The second project requires that you retrieve serial input from the keyboard, which can be done by using Serial.read$(),$ which returns a byte. See the docs for a fully working example. However, the serial monitor command is just for $...$ monitoring. To read input, do the following:

macOS: Launch terminal and execute this command: screen $/$dev$/$tty$.$usbmodem$144101$

the number may vary $--$ look at the tty$.$usbmodem files in $/$dev$,$ and pick the most recent one $($when your Photon $2$ is connected$)$

Windows: Launch putty and use the options shown at right

the Serial line may vary $-$ launch Device Manager and verify the port being used by your Photon $2$

Deliverables: Each project has its own folder$/$directory$.$ Zip up both $($into one zip file$)$ and upload it to Canvas. Also upload $2$ short videos showing each project running on your Photon $2($so that I can verify your circuit$).$

Notes:

C$++$ has functions, use them appropriately to make your code clearer. Do not do everything in setup$()$ and loop$().$

Do not use any sorts of loops in loop$),$ or any function called from loop$().$ The loop$()$ method is called for you over and over, any "looping" will be a result of that mechanism.

Include short comments to the right of most statements in you methods, except the very obvious ones.

Ports $($COM & LPT$)$

USB Serial Device $($COM$3)$