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1. Fritz drawing electronic circuit diagram -0004 Arduino example - Analog input
The complete guide to implementing Arduino analog input example (controlling LED flashing frequency) in Fritzing is as follows
1. Circuit connection breadboard wiring diagram Power connection: A red wire is led out from the 5V pin of Arduino and connected to the positive power rail of the breadboard. Connect a black wire from the GND pin to the negative power rail of the breadboard. The potentiometer connection connects the middle pin of the potentiometer to the A3 pin of Arduino through a yellow wire (A0 is used by default in the code, but the example in the figure is A3, which needs to be adjusted according to the actual situation). The two pins of the potentiometer are respectively connected to the positive and negative power rails (i.e. 5V and GND) of the breadboard. The LED connection connects the long pin (anode) of the LED to pin 13 of the Arduino through a green wire and is connected in series with a 220 Ω resistor (for current limiting). The short pin (cathode) of the LED is connected to the negative power rail (GND) of the breadboard. The circuit diagram and PCB diagram show the logical connection relationship of components, which facilitates understanding of the circuit structure. PCB diagram is used for actual circuit board design, displaying the physical layout and wiring of components
2. Complete code implementation: int sensorPin=A0; //Potentiometer input pin (actually connected to A3 in the example, needs to be modified) int ledPin=13; //LED output pin int sensorValue=0; //Store sensor readings as void setup() {pinMode (ledPin, OUTPUT);//Initialize LED pin to output mode} void loop() {sensorValue=Analog
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3. In practical operation, the hardware connection is completed according to the breadboard wiring diagram to ensure that the middle pin of the potentiometer corresponds to the Arduino pin (code defaults to A0, the example in the figure is A3). If using onboard LEDs (connected to pin 13), external LEDs and resistors can be omitted. Code upload: Change the sensorPin=A0 in the code to the actual connected pin (such as A3). Upload code to the development board through Arduino IDE. Effect verification: Rotate the potentiometer knob and observe the change in LED flashing frequency: turn the knob clockwise → increase reading → slow flashing. Rotate the knob counterclockwise → the reading decreases → the flashing becomes faster. When the flicker frequency exceeds 24Hz, the human eye perceives it as constantly on (visual persistence effect)
4. Common problem: LED does
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