The project replicates the "Open Source Small TV Stand Project" from Yunmengze Entrepreneurial Space.Joining the official group can provide access to the full set of design reference documents.

 Desktop Weather Station

Materials Required:<ul><li>Arduino UNO board</li><li>LCD1602 display or HD44780</li><li>Push button</li><li>2、10kΩ resistor</li><li>Breadboard and jumper wires</li><li>USB cable to connect Arduino to a computer</li></ul>Circuit Connection:<ul data-checked="false"><li>Connect the LCD1602 or HD44780 Display:</li></ul><ul><li class="ql-indent-1">Connect the VSS pin to Arduino GND.</li><li class="ql-indent-1">Connect the VDD pin to Arduino 5V.</li><li class="ql-indent-1">Connect the VO pin to the A0 pin through a 2kΩ potentiometer to adjust contrast.</li><li class="ql-indent-1">Connect the RS pin to Arduino pin 12.</li><li class="ql-indent-1">Connect the RW pin to Arduino GND.</li><li class="ql-indent-1">Connect the EN pin to Arduino pin 11.</li><li class="ql-indent-1">Connect the D4 to D7 pins to Arduino pins 5, 4, 3, and 2 respectively.</li><li class="ql-indent-1">Connect the A pin to Arduino 5V and the K pin to Arduino GND to light the backlight.</li></ul><ul data-checked="false"><li>Connect the Push Button:</li></ul><ul><li class="ql-indent-1">Connect one end of the button to Arduino pin 7.</li><li class="ql-indent-1">Connect the other end to Arduino 5V through a 10kΩ resistor.</li><li class="ql-indent-1">Connect the middle terminal of the button to Arduino GND.</li></ul>rogramming the Arduino:The provided code handles the game logic, player movement, and obstacle generation. To upload the code to your Arduino board, follow these steps:<ol><li>Open the Arduino IDE on your computer.</li><li>Copy the provided code and paste it into a new sketch.</li><li>Select the correct Arduino board and port in the IDE.</li><li>Click the "Upload" button to compile and upload the code to the Arduino board.</li></ol>Operation Flow:<ul data-checked="false"><li>Power On:</li></ul><ul><li class="ql-indent-1">Connect the Arduino board to your computer via the USB cable and power it on.</li></ul><ul data-checked="false"><li>Game Initialization:</li></ul><ul><li class="ql-indent-1">The LCD will display "Avoid Obstacles!" for 2 seconds before clearing the screen.</li></ul><ul data-checked="false"><li>Playing the Game:</li></ul><ul><li class="ql-indent-1">Press and hold the button to make the player jump to the opposite row.</li><li class="ql-indent-1">Release the button to return the player to the original row.</li><li class="ql-indent-1">Obstacles will appear randomly in the rightmost columns of the first and second rows and will move leftward.</li><li class="ql-indent-1">The game ends if the player and an obstacle occupy the same column.</li></ul><ul data-checked="false"><li>Game Over:</li></ul><ul><li class="ql-indent-1">If a collision occurs, the LCD will display "Game Over!" for 2 seconds before resetting the game.</li></ul><ul data-checked="false"><li>Restarting the Game:</li></ul><ul><li class="ql-indent-1">After the game over screen, the game will automatically reset, and you can start playing again.</li></ul>

Arduino Obstacle Avoidance Game Circuit 

This project simulates a frequency meter using an Arduino UNO board. The circuit includes an LCD display and a switch. The LCD display's RS, EN, D4, D5, D6, and D7 pins are connected to Arduino UNO digital pins 12, 11, 7, 6, 5, and 4, respectively. A switch is connected to analog pin A0 of the Arduino UNO. When the switch detects a high signal, it triggers the Arduino UNO to start counting the pulses. The frequency is calculated by dividing 1000 by the average duration of the pulses. The result is displayed on the LCD, allowing users to read the frequency of the external signal source. This frequency meter can be used in various applications where pulse frequency measurement is required, such as in electronics testing, signal analysis, or educational demonstrations.

Frequency Meter Based on Arduino UNO

In the circuit, the base of transistor BJT1 is stabilized at 13V by a voltage regulator diode. When the input voltage exceeds 13V, the output voltage remains almost unchanged regardless of how the input voltage is adjusted.

Series Voltage Regulator

The circuit&nbsp;uses an inductor (L) and a capacitor (C) connected in parallel to generate oscillations. It operates on the principle of energy exchange between the electric field in the capacitor and the magnetic field in the inductor, producing a sinusoidal waveform at a frequency determined by the values of L and C.&nbsp;

Parallel LC Oscillator Circuit

Rc=(5V-2V)/10mA=300Ωβ=100 ----&gt; Ib=10mA/100=100uAVbe=0.7V ----&gt; Rb&lt;(3.3V-0.7V)/100uA=26kΩ

NPN LED driver

In a circuit, when a reverse-biased diode is subjected to a reverse voltage that exceeds the breakdown voltage value, the diode will experience breakdown.

Breakdown Characteristics of Diodes

NPN Darlington transistor

PNP Darlington transistor

Common base amplifier circuit, DC path.

Common-Base Amplifier Circuit

Common collector amplification circuit, DC path.

Common-Collector Amplifier Circuit

Common emitter amplifier circuit, DC path.

Common-Emitter Amplifier Circuit

When the project is powered on, the Arduino UNO reads the analog value from pin A0, which is connected to the potentiometer. The analog value is then converted to a voltage reading, assuming a 5V reference voltage. The voltage is displayed on the LCD, updated every 100 milliseconds to show the current voltage at the A0 pin.

Voltage Meter

The project uses PWM to create a smooth transition in the LED's brightness, simulating a waveform signal. As the PWM duty cycle increases, the LED becomes brighter, and as it decreases, the LED dims.&nbsp;

PWM Signal

When the Simple Timer project is powered on, it immediately starts measuring time and displays "Time: 00:00" on the LCD. The time continues to update in real-time, incrementing in seconds and minutes as time passes. The project demonstrates the use of the millis() function for timekeeping and the LiquidCrystal library for displaying output on an LCD screen.

Simple Timer

When a switch is pressed, the Arduino UNO checks if the number corresponds to the preset password. If the correct password is entered, the corresponding number is displayed on the seven-segment display, and the LED can be used to indicate a successful unlock. After a correct entry, the password is randomly regenerated for the next attempt.&nbsp;

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