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| # | Post Title | Result Info | Date | User | Forum |
| Answer to: What exactly is PWM resolution ? | 3 Relevance | 1 year ago | catElectronics | Hardware/Schematic | |
| To put this PWM resolution concept into a practical context: If you’re dimming an LED with an Arduino UNO’s 8-bit PWM, you might see noticeable brightness steps when changing the duty cycle. This is because each step is about 0.4% of the Total brightness. With the ESP32’s 16-bit PWM, each step is only 0.0015%, so the LED brightness change is much smoother and almost imperceptible. This is crucial if you’re working on projects that require precise control, like mood lighting or audio signal modulation. But keep in mind, that the lower frequency at higher resolutions might introduce visible flicker in LEDs, so you’ll need to find a balance between resolution and frequency depending on your application. | |||||
| Answer to: What is EEPROM in Arduino and how to use it? | 3 Relevance | 1 year ago | Sebastian | Hardware/Schematic | |
| EEPROM (Electrically Erasable Programmable Read-Only Memory) allows you to store data even after the board is powered off. It's non-volatile. This makes it useful for storing things like settings, calibration values, or any data you WAnt to retain. Let's understand the different memory types in Arduino: SRAM: Works as temporary storage while the program is running. Data in SRAM is lost when the power is turned off. Flash Memory: The Arduino stores your program code here. Like EEPROM, flash memory is non-volatile, but you can't store or retrieve any data d ... | |||||
| Answer to: How Does an Ultrasonic Sensor Like HC-SR04 Measure Distance? | 3 Relevance | 2 years ago | Alfred Alonso | Theoretical questions | |
| ... ultrasonic WAves propagate through the air until they hit an object, and when the WAves encounter an object, they reflect back towards the sensor. Immediately after the sensor transmit the signal, the Echo pin goes high. This signifies the start of the sensor's listening period. The sensor now awaits the return of the reflected ultrasonic WAve. If an object is within range, the receiving signal will be detected, causing the Echo pin to transition from high to low. The duration the Echo pin remains high corresponds to the Total time taken for the ultrasoni ... | |||||
| RE: Is Arduino still relevant in 2024? | 3 Relevance | 2 years ago | Jeffmon | Arduino | |
| ... charger that I WAs recently involved in ran into over $23,000. The unit used a PIC Microcontroller and could charge 4 batteries of all construction types. 70% of this charge WAs in the 9 prototypes that were required. The PCB engineer and the software engineer put in many, many hours. Have you seen the dollars amount an engineer commands these days? My job WAs simple. I designed the power switching interface between the Microcontroller and the battery. An Arduino MEGA would have made this task much cheaper but we are aligned with Microchip and are ther ... | |||||
| Answer to: Need help with the working of this circuit | 3 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. | |||||
| Answer to: How can servo jitter be reduced in Arduino projects? | 2 Relevance | 4 months ago | Neeraj Dev | Arduino | |
| Servo jitter in Arduino projects is usually caused by power instability, electrical noise, long signal wires, or software timing conflicts. To reduce it, use a separate and stable power supply for the servo (not the Arduino 5V pin), and connect all grounds together. Add a 100 µF–470 µF electrolytic capacitor near the servo’s power pins and a small 0.1 µF ceramic capacitor for noise filtering. A 220–470 Ω resistor in series with the signal line can also help. On the software side, avoid writing the same servo position repeatedly, filter noisy input signals, and use small delays or smoothing functions to prevent rapid position changes. These steps usually eliminate most servo jitter problems. | |||||
| Answer to: How does capacitor ESR affect decoupling performance? | 2 Relevance | 5 months ago | Amelia | Theoretical questions | |
| ESR (Equivalent Series Resistance) plays a big role in how effective a decoupling capacitor is. Low ESR capacitors, like ceramics, are great at handling high-frequency noise and fast transients, which is why they’re used near IC power pins. However, ultra-low ESR isn’t always ideal—some regulators actually require a certain ESR range for stability, and higher ESR capacitors (like electrolytics) can help by damping resonances and providing bulk decoupling at lower frequencies. The best practice is to use a mix: low ESR ceramics for high-frequency suppression, and higher ESR electrolytics or tantalums for bulk energy storage and damping, while always checking the regulator’s ESR requirements in its datasheet. | |||||
| Answer to: Can ESP32 stream audio over Wi-Fi or Bluetooth? | 2 Relevance | 6 months ago | Neil_Overtorn | ESP32 | |
| Yes, it’s possible to stream audio from an ESP32 over both Wi-Fi and Bluetooth, but the method depends on what you need. For Wi-Fi, many developers use the ESP-ADF (Espressif Audio Development Framework), which supports protocols like HTTP, WebSocket, or RTP for audio streaming. Some lighter approaches involve ESPAsyncWebServer to stream raw or encoded data such as MP3. For Bluetooth, the ESP32-A2DP library works well for sending audio to headphones or speakers using the A2DP profile. In terms of performance, the ESP32-S3 and ESP32-A1S (with an external audio codec) are better suited than the standard ESP32 since they handle audio tasks more efficiently and have stronger support in ESP-ADF. Wi-Fi generally provides higher bandwidth and better quality but can introduce noticeable latency, while Bluetooth offers simpler real-time streaming at the cost of codec limitations and range. Overall, the ESP32 is capable of decent audio streaming for IoT or hobby projects, though it won’t match dedicated audio hardware for high-fidelity or ultra-low-latency applications. | |||||
| Answer to: Multimeter continuity beeps with no contact — false positives? | 2 Relevance | 8 months ago | Anju | Equipments | |
| If your multimeter is acting strangely—like giving false continuity readings—my advice is to first check the manual. If you don’t have a physical copy, most manufacturers provide manuals online. Make sure the test probes are inserted into the correct sockets for the type of measurement you're doing, and also verify that the batteries are in good condition and properly installed. If everything appears fine and the problem still exists, there’s a good chance the multimeter itself is faulty—especially if it’s a low-cost Model. I wouldn’t recommend trying to repair it yourself, as defects might affect other functions and make it potentially unsafe to use. In such cases, it's better to replace it with a quality multimeter that’s safety-rated. This ensures greater reliability and safety, especially for household electrical work. | |||||
| Answer to: Raspberry Pi OS vs Ubuntu vs DietPi — Which one is better? | 2 Relevance | 8 months ago | Dinesh bhardwaj | RPi Pico | |
| I’ve tested all three — Raspberry Pi OS, Ubuntu, and DietPi — and honestly, each one has its strengths depending on what you’re trying to do. If you're using a lower-end Model like the Pi 3 or Zero, DietPi is a beast in terms of performance. It's super lightweight and boots fast, with very minimal background processes. Great for headless or server-style setups. Raspberry Pi OS is the most balanced in my opinion. It’s stable, well-supported, and has excellent compatibility with GPIO, camera modules, and most accessories. Plus, it’s officially maintained by the Pi Foundation, so updates and long-term support are pretty solid. Ubuntu (especially Server) is decent, but I’ve found it to be a bit heavier on Pi 3 and not ideal for Zero. It works better on Pi 4, and is nice if you're already used to Ubuntu on desktops or other servers. That said, sometimes peripherals or GPIO need extra tweaks to work smoothly. In terms of ease of use — Pi OS with Desktop is very beginner-friendly. DietPi is command-line based but has a great first-boot installer that lets you choose only what you need, so it’s pretty efficient. Ubuntu is more for those who are already comfortable with Linux. For community and support, Pi OS is the winner. Tons of tutorials, help forums, and guides tailored specifically to the Pi. DietPi and Ubuntu both have good communities too, but they’re a bit more general. My personal picks: For simple or GPIO-heavy projects → Raspberry Pi OS For lightweight, headless, or server projects → DietPi For more advanced server use on Pi 4 → Ubuntu Server Hope that helps — happy to share more if you’ve got a specific use case in mind! | |||||
| Connecting Unequal Li-ion Batteries in Parallel | 2 Relevance | 8 months ago | Janet | Theoretical questions | |
| I'm working on a battery-powered project and came across something that seems simple but feels more complicated the more I think about it. Suppose I have two identical 3.7V Li-ion cells, both with the same capacity and chemistry, but one is sitting at 4.1V and the other at 3.9V. If I connect them directly in parallel (positive to positive, negative to negative), what exactly happens? I know current will flow from the higher voltage cell to the lower one, but: How much current are we talking about? Is there a risk of damaging the cells or causing overheating? Why doesn’t the higher-voltage cell just “wait” until they equalize gradually? Would internal resistance limit the surge, or is it still unsafe? I’m also curious how BMS (Battery Management Systems) handle this situation, and whether any passive or active balancing is required before connecting cells in parallel. If anyone has experience or insight (especially real-world examples or best practices), I’d really appreciate it! | |||||
| Answer to: ESP32 or STM32: Which is better for IoT? | 2 Relevance | 8 months ago | NextGenTech | ESP32 | |
| Each has its strengths—no need to choose sides. Use the ESP32 when you need wireless, the STM32 when you need control. They're affordable enough to keep both on hand for whatever the project demands. | |||||
| Answer to: Difference between asynchronous and synchronous resets in flip-flops? | 2 Relevance | 8 months ago | Kanishk | Theoretical questions | |
| Asynchronous and synchronous resets both serve to bring flip-flops to a known initial state, but they differ significantly in how and when they operate. An asynchronous reset takes effect immediately, regardless of the clock. This means that the moment the reset signal is asserted, the flip-flop resets—whether or not the clock is running. On the other hand, a synchronous reset only takes effect on the active edge of the clock (usually the rising edge). So even if the reset signal is asserted, the flip-flop will not reset until the next clock edge occurs. In digital design or when writing HDL like Verilog or VHDL, it is generally recommended to default to synchronous resets. They are easier to work with in timing analysis, more predictable in simulation, and better supported by most FPGA tools. Synchronous resets ensure that all logic changes happen in sync with the clock, which reduces the risk of glitches and metastability. However, there are situations where an asynchronous reset is necessary, such as when dealing with logic that receives a clock from an external device (a source-synchronous system) where the clock can stop. In such cases, a synchronous reset would not work because the flip-flop wouldn’t reset without a clock edge, so an asynchronous reset becomes essential to ensure proper initialization or fault handling. That said, asynchronous resets come with critical caveats, particularly around how they are removed. If the reset signal is deasserted (goes low or inactive) while the clock is not running, the circuit may enter an unpredictable state. To prevent this, designers often use a technique called synchronous reset removal, where the asynchronous reset is passed through a synchronizer (usually a two-stage flip-flop chain) so that the system only comes out of reset on a clean, clocked edge. This ensures stable behavior and avoids metastability issues. It’s also important to avoid relying on the reset value of an asynchronously reset flip-flop immediately after reset; doing so can lead to inconsistent behavior across builds, as synthesis tools may handle this differently. | |||||
| Answer to: Ghosting or crosstalk in my matrix keypad or display? | 2 Relevance | 8 months ago | Divyam | Theoretical questions | |
| Ghosting in keypads and LED matrices is usually caused by missing diodes and incorrect scanning logic, not just electrical interference. For keypads, always add isolation diodes if you expect multiple simultaneous keypresses. For LED matrices, ensure you scan the display correctly and fast enough. In both cases, keep wiring tidy, and avoid crosstalk by separating signal lines. These steps will eliminate most ghosting and unintended behavior in matrix systems. | |||||
