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| # | Post Title | Result Info | Date | User | Forum |
| Answer to: Difference Between delay() and millis() in Arduino? | 16 Relevance | 1 year ago | Admin | Programming | |
| In-depth explanation of delay() VS millis() in Arduino: What is delay()?The delay(ms) function is a simple WAy to pause your program for a specific duration (in milliseconds). While using delay(), the microcontroller does nothing except WAit, effectively blocking all other code execution. Example: Blinking an Led using delay()Here’s a basic example of using delay() to blink an Led every second: const int LedPin = 13; void setup() { pinMode(ledPin, OUTPUT); } void loop() { digitalWrite(ledPin, HIGH); // Turn Led on delay(1000); // WAit for ... | |||||
| Answer to: Need help with the working of this circuit | 15 Relevance | 2 years ago | mertozkan | Circuits and Projects | |
| @nathan This circuit diagram is for a simple Led flashlight controlled by a push button switch. Here's how it works: 1. Power Supply: The circuit is powered by two 3V batteries connected in series, providing a total of 6V. 2. Switch: When you press the button ("Push ON"), it completes the circuit, allowing current to flow. 3. Capacitor and Diode: - The 100u capacitor is used to smooth out any voltage fluctuations, acting as a buffer to provide a steady voltage to the Led. - The 1N4148 diode prevents current from flowing back into the capacitor, ensuring that the capacitor discharges only towards the Led. 4. Resistor (100k): This resistor limits the base current going into the transistor. It ensures that the transistor is not damaged by excessive current and controls the transistor's switching action. 5. Transistor (BC547): This acts as a switch. When current flows through the 100k resistor to the transistor's base, it allows a larger current to flow from the collector to the emitter of the transistor, powering the Led. 6. Led: The "Super-bright White Led" lights up when the transistor conducts. Leds are diodes that emit light when current flows through them in the correct direction, as indicated by the arrow in the symbol. 7. Resistor (15R): This 15-ohm resistor is connected in series with the Led to limit the current flowing through the Led, protecting it from burning out by excessive current. In summary, when the push button is pressed, it completes the circuit allowing current to flow. The current passes through the 100k resistor to the transistor's base, turning it on. This allows a larger current to flow through the transistor to the Led, lighting it up. The resistor in series with the Led ensures that only a safe amount of current flows through the Led. The diode and capacitor work together to manage the voltage and current supplied to the Led for steady operation. | |||||
| How to calculate correct resistor values for an LED? | 6 Relevance | 1 year ago | Jaden | Arduino | |
| I’m using an Led with an Arduino. While researching, I noticed that many people use different resistor values, such as 100Ω 220Ω, 1kΩ, or even other values. This got me wondering: how do you decide which resistor value to use with an Led, and how do you calculate it? | |||||
| Answer to: How to calculate correct resistor values for an LED? | 12 Relevance | 1 year ago | Admin | Arduino | |
| The resistor value for an Led is crucial as it limits the current flowing through the Led, protecting it from damage. Choosing the right resistor value depends on the Led's specifications and the voltage of your circuit. Here's how you can calculate it: Formula- R = (Vsource - Vf) / ILed Vsource is the Arduino’s pin voltage (e.g., 5V or 3.3V). Vf is the Led’s forward voltage (e.g., ~2V for red, ~3V for blue/white). Iled is the desired current (usually 10-20mA for standard Leds). For example, with a 5V source, a red Led (Vf = 2V), and 15mA current: R = (5V - 2V) / 0.015A = 200Ω People choose different resistor values based on: Brightness: Lower resistors (e.g., 100Ω) make Leds brighter; higher resistors (e.g., 1kΩ) dim them. Power source: Different sources (3.3V vs. 5V) need different resistors. Led specs: Forward voltage and current ratings vary by Led. | |||||
| Answer to: How to identify LED terminals? | 8 Relevance | 2 years ago | Sebastian | Theoretical questions | |
| Hi Aiden, To identify the anode and cathode of an Led, start with a visual inspection. Typically, the longer lead is the anode, and the shorter one is the cathode. If this method is not possible, another helpful visual indicator is the presence of a flat spot on the Led’s rim, which marks the cathode. If the internal structure is visible, the larger metal piece (die) inside the Led is connected to the cathode. If visual cues are unclear, electrical testing can be performed. Using a multimeter set to diode mode, place the probes on the leads; a reading will indicate that the anode is connected to the positive probe. Alternatively, you can connect a battery and resistor, attaching the positive terminal to one lead. If the Led lights up, the connected lead is the anode. hope this will help | |||||
| Answer to: Arduino UNO R4 Wi-Fi Project ideas! | 8 Relevance | 1 year ago | Yvette | Arduino | |
| Here is the list of UNO R4 WiFi projects I found during my research: 1. Weather Station Using Arduino UNO R4 WiFi & VisuinoBuild a weather station to monitor temperature, humidity, and pressure using sensors. The data is displayed and updated in real time using Visuino software.Project Link: Weather Station Project 2. Arduino UNO R4 WiFi ExperimentsExplore multiple small projects to familiarize yourself with the UNO R4 WiFi, including controlling the onboard Led matrix and creating simple WiFi apps.Project Link: UNO R4 WiFi Experiments 3. Home Automation with Web ServerSet up a home automation system using a local web server hosted on the Arduino UNO R4 WiFi. Control home appliances remotely without relying on third-party IoT platforms.Project Link: Home Automation System 4. Led Matrix AnimationsLearn how to program the built-in 12x8 Led matrix on the UNO R4 WiFi to display custom animations and graphics. A great project for beginners to practice coding and Led control.Project Link: Led Matrix Programming 5. Smartphone-like Device with AppsTransform the Arduino UNO R4 WiFi into a smartphone-like device with multiple apps, a keyboard, and cloud sync. An innovative project showcasing the board's capabilities.Project Link: Smartphone-like Device Project 6. SparkFun Qwiic Kit IntegrationConnect various sensors and components using the SparkFun Qwiic Kit with the Arduino UNO R4 WiFi. This guide is ideal for experimenting with multiple peripherals.Project Link: SparkFun Qwiic Kit Guide P.S.: I tried some of these not all. | |||||
| How to identify LED terminals? | 6 Relevance | 2 years ago | Aiden | Theoretical questions | |
| Hi everyone, I'm working on a school project that involves Leds. I came across an Led where both the anode and cathode leads are of equal length, making it difficult to distinguish between them using the typical lead length method. Additionally, the internal structure of the Led is not visible. What are some reliable methods or techniques I can use to accurately identify the anode and cathode terminals in this situation? | |||||
| RE: How to identify LED terminals? | 4 Relevance | 7 months ago | Deboojit | Theoretical questions | |
| @sebastian Good explanation! But what if the Led is part of a circuit and cannot be easily removed—what’s the safest WAy to identify the anode and cathode in-circuit? | |||||
| Need help with the working of this circuit | 4 Relevance | 2 years ago | nathan | Circuits and Projects | |
| Hello everyone, I found this circuit in the "100 transistor circuits" ebook. Can somebody explain the working? Thank you Attachment : LED-flasher-circuit.jpg | |||||
| RE: new to electronics and needing some guidance with a circuit . 555 LED lights | 3 Relevance | 10 months ago | basilwatson | Circuits and Projects | |
| @ankunegi thank you thats very kind of you ! Stephen | |||||
| Answer to: Multiple LEDs using fewer Pins- how to expand Arduino GPIO pins? | 7 Relevance | 1 year ago | Admin | Arduino | |
| ... shift register, and you can daisy-chain multiple registers to control even more Leds. This is a great solution if you need simple on/off control for your Leds. Multiplexing – If you don’t need all Leds to be on simultaneously, you can use a multiplexing approach. This involves arranging Leds in a matrix where rows and columns are controlled separately, significantly reducing the number of GPIOs needed. However, since Leds are turned on one at a time in rapid succession, brightness might be affected unless you use high-speed switching. Led Driver ICs (e.g. ... | |||||
| Answer to: Program to toggle LED state with a single button? | 6 Relevance | 1 year ago | Admin | Programming | |
| ... tries to debounce but isn't ideal because it blocks the loop and prevents the Arduino from doing anything else during that time. Direct Button Read Without Edge Detection – Since you're checking digitalRead(buttonPin) == HIGH, if you hold the button down even slightly too long, it keeps toggling instead of switching just once per press. Try the program given below. Better program to toggle Led state with a single button: const int buttonPin = 2; const int LedPin = 13; bool LedState = false; bool lastButtonState = LOW; unsigned long lastDebounceTime = ... | |||||
| RE: new to electronics and needing some guidance with a circuit . 555 LED lights | 3 Relevance | 10 months ago | Admin | Circuits and Projects | |
| @basilwatson glad to be of help 🙂 If you have any other doubts, feel free to reach out. | |||||
| Answer to: new to electronics and needing some guidance with a circuit . 555 LED lights | 3 Relevance | 10 months ago | basilwatson | Circuits and Projects | |
| @ankunegi Thank you that WAs kind of you, I had connected up the capacitor and tinker cad said "wrong WAy round " so I left them ,,, not knowing what I WAs doing ... Another "similar" circuit I have suggests 440 ohm resistors I will use your suggestion. Once I know the circuit works ..I have a safe point to retreat back to Once again thank you for taking the time to look at the tinkercad sim kind regards Stephen | |||||
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