1a) Write the code using CircuitPython (in Python). Create an alarm system using the Raspberry Pi Pico (RP2-B2) with the elements below. The window/doors and movement sensors are not needed yet. 1b) Make a circuit schematic of the placement of added resistors, the 5 push buttons and elements on the diagram. - Passcode System (PS) - This is the hardware used to input a passcode to activate, deactivate, or control the security alarm system. - Core: Switches - Five mini push buttons that represent the symbols 0 thru 2 , , and #. - Other than the initial program setup that is done using the host computer's keyboard, all other input operations must be handled using the PS as the primary user interface. - Passcode - A three (3) digit number that is used for securely accessing the alarm system Entry of a passcode is complete when it is followed by a # (hash) symbol. - Zone - A specific area that can be protected (e.g., one or more windows, doors, or hallways) - A zone can be independently set to be either monitored or not. For example, if the entire structure is unoccupied, then all zones are monitored doors windows, and motion sensors. If someone is legitimately in the structure at night, then the doors/windows can be monitored, while the inside motion sensor is deactivated to prevent false alarms. - DISENGAGED mode - The alarm system is turned OFF: sensors are not monitored at all; audio/visual alarms are deactivated (turned off) - These user operations are allowed via the PS: - Enable or disable zone #1 (door/window sensor) - This works like a toggle: Enter * 1 to enable, enter * 1 again to disable. Have a space for the code for the sensors later, just have the code for enabling and disabling the zones. - Enable or disable zone #2 (movement sensor) - This works like a toggle: Enter 2 to enable, enter 2 again to disable. Have a space for the code for the sensors later, just have the code for enabling and disabling the zones. - Enable ARMED mode by entering the proper passcode - ENGAGED mode - The alarm system is turned ON: sensors are monitored; audio/visual alarms are activated if a security breach is detected - This user operation is allowed via the PS: - Enter DISARMED mode by entering the proper passcode - If an intrusion has been detected: - The system emits a warning (e.g., one flashing LED or a beep sound) and gives the user up to ten (10) seconds to enter the disarm passcode. - If more than 10 seconds have elapsed with no passcode entered, or if the passcode is entered incorrectly more than three times in a row, then audio/visual alarms are activated (e.g., all lights flashing, continuous buzzer sound). When the CircuitPython program starts running, display a menu (e.g., as text in the Mu serial window) from which the user can pick one of these options: - Ref passcode - Asks the user to enter a reference passcode for testing - If none is entered, use a default passcode (e.g., 000). - Run - Executes the alarm system module - The program put.

1. 1a) Write the code using CircuitPython (in Python). Create an alarm system using the Raspberry
Pi Pico (RP2-B2) with the elements below. The window/doors and movement sensors are not
needed yet.
1b) Make a circuit schematic of the placement of added resistors, the 5 push buttons and
elements on the diagram.
- Passcode System (PS) - This is the hardware used to input a passcode to activate, deactivate, or
control the security alarm system. - Core: Switches - Five mini push buttons that represent the
symbols 0 thru 2 , , and #. - Other than the initial program setup that is done using the host
computer's keyboard, all other input operations must be handled using the PS as the primary user
interface. - Passcode - A three (3) digit number that is used for securely accessing the alarm
system Entry of a passcode is complete when it is followed by a # (hash) symbol. - Zone - A
specific area that can be protected (e.g., one or more windows, doors, or hallways) - A zone can
be independently set to be either monitored or not. For example, if the entire structure is
unoccupied, then all zones are monitored doors windows, and motion sensors. If someone is
legitimately in the structure at night, then the doors/windows can be monitored, while the inside
motion sensor is deactivated to prevent false alarms. - DISENGAGED mode - The alarm system is
turned OFF: sensors are not monitored at all; audio/visual alarms are deactivated (turned off) -
These user operations are allowed via the PS: - Enable or disable zone #1 (door/window sensor) -
This works like a toggle: Enter * 1 to enable, enter * 1 again to disable. Have a space for the code
for the sensors later, just have the code for enabling and disabling the zones. - Enable or disable
zone #2 (movement sensor) - This works like a toggle: Enter 2 to enable, enter 2 again to disable.
Have a space for the code for the sensors later, just have the code for enabling and disabling the
zones. - Enable ARMED mode by entering the proper passcode - ENGAGED mode - The alarm
system is turned ON: sensors are monitored; audio/visual alarms are activated if a security breach
is detected - This user operation is allowed via the PS: - Enter DISARMED mode by entering the
proper passcode - If an intrusion has been detected: - The system emits a warning (e.g., one
flashing LED or a beep sound) and gives the user up to ten (10) seconds to enter the disarm
passcode. - If more than 10 seconds have elapsed with no passcode entered, or if the passcode is
entered incorrectly more than three times in a row, then audio/visual alarms are activated (e.g., all
lights flashing, continuous buzzer sound). When the CircuitPython program starts running, display
a menu (e.g., as text in the Mu serial window) from which the user can pick one of these options: -
Ref passcode - Asks the user to enter a reference passcode for testing - If none is entered, use a
default passcode (e.g., 000). - Run - Executes the alarm system module - The program puts the
system into the DISENGAGED mode and waits for further PS input. - Exit - Quits the program 2.
The program should display status messages that alert you of significant system events, like when
a sensor trips. For example, you could write a message to the console window.Passcode:
Separate push buttons For the core project, you are to use mini push button switches to enter the
passcode and to control the security zone system. If you do not have enough inputs available on
the Raspberry Pi Pico you can connect all the code entry buttons to a single GPIO pin using the
following method. Procedure for connecting multiple switches to a single analog input channel: -
Construct a voltage divider ladder for the number of switches you want to use. For example, see
Figure 10 for a three-switch version. Select resistors that give a good separation in VaIN. Note:

2. You can expand the network to handle more switches. See if you can derive the general equations
for the measured AIN voltage. - Connect the circuit to an available GPIO pin on the LabJack. -
Configure the channel for analog input (AIN) mode. SW1 pressed: VAIN=0 SW2 pressed: VAIN=R
1+R2R2VS SW3 pressed: VAIN=R1+R2+R3R2+R3VS No switch pressed: VAIN=VS Figure 10:
Voltage divider ladder for three switches You can use an if-elif selection statement to determine
which switch was pressed. Since the measured input voltage is analog, so you will need to test
whether the voltage falls within a small range that brackets the desired test value.PWM pins on R-
PI PICURaspberry Pi PICO Pinout