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| # | Post Title | Result Info | Date | User | Forum |
| Answer to: Is a capacitor really linear? | 8 Relevance | 9 months ago | Admin | Theoretical questions | |
| A capacitor is called linear because the relationship between the voltage across it and the current flowing through it is linear. The exponential curve you're seeing is its behavior over time, which is different. Here’s the breakdown: What "Linear" actually means here In circuit theory, a component is linear if it follows the rule of superposition and scaling.1 In simple terms: if you Double the cause, you Double the effect. For a capacitor, the relationship is defined by the equation 2I=CdtdV.3 This means the current (4I) is directly proportional to the rate of change of voltage (5dV/dt).6 So, if you Double the current going into the cap, its voltage changes twice as fast. If you halve the current, its voltage changes half as fast. That direct, proportional relationship is what makes it a linear component. So why the exponential curve? That famous exponential curve shows the capacitor's voltage versus time when it's part of a circuit with a resistor (an RC circuit). It's not a direct graph of voltage vs. current. Think about what happens when you charge it: At the start, the capacitor is empty, so a large current flows in. As it charges, voltage builds up across it. This built-up voltage opposes the source, which reduces the voltage across the resistor, and therefore reduces the current flowing into the cap. So, the charging slows down as it gets fuller. This process of "charging slower and slower as it fills up" is what creates that exponential curve. The capacitor itself is still behaving linearly at any given instant, but the behavior of the whole circuit over time is exponential. So: Component's V-I relationship: Linear. (The physics of the cap itself). Circuit's V-T response: Exponential. (The behavior you see over time in an RC circuit). Hope that clears it up! | |||||
| Answer to: Can I power my Arduino using a phone charger via USB? | 3 Relevance | 8 months ago | Mehjabeen | Theoretical questions | |
| A standard 5V phone charger (with at least 500 mA output) and a proper USB cable are usually perfectly fine for powering an Arduino Uno or Nano via USB. Just Double-check the specifications of your charger to be sure it's not outputting more than 5V | |||||
| Arduino Code Not Uploading – What Could Be the Issue? | 3 Relevance | 9 months ago | Zane_Tech | Arduino | |
| I'm trying to upload a sketch to my Arduino board, but it keeps failing. I'm using the Arduino IDE, and I’ve Double-checked my code—it compiles fine. However, during upload, I get an error message like “avrdude: stk500_recv(): programmer is not responding” or “timeout communicating with programmer.” | |||||
| RE: How to Identify the Neutral Wire Using a Multimeter? | 3 Relevance | 1 year ago | Admin | Equipments | |
| It’s not always safe to assume all outlets follow the same pattern, especially in older homes where wiring might have been altered over time, so it’s best to check each one individually. If the voltage between live and earth is lower than expected, there can be many reasons, can't just blindly say that the issue is with grounding. You can Double-check by testing other outlets. If something seems off, it’s worth having an electrician take a look for safety. | |||||
| Random garbled text on Serial Monitor? | 3 Relevance | 1 year ago | sharon | Arduino | |
| Hello everyone, I'm pretty new to Arduino programming, and I’m having trouble with serial communication on my Arduino Uno. I’m trying to use Serial. Begin(9600); in my code and have matched the baud rate with the Serial Monitor, but I either get random garbled text or no output at all. I’ve Double-checked the baud rate settings, but I’m still not sure what’s going wrong. Is this something common for beginners? Could I be missing something important in the code or setup? Any help on how to troubleshoot this would be really appreciated! | |||||
| Answer to: How does Arduino handle floating-point operations? | 6 Relevance | 9 months ago | Admin | Programming | |
| Yes Arduino can do floating-point operations, but there’s a few things to keep in mind. 1. On boards like the Uno or Nano (which use the ATmega328P), it supports float and Double, but the funny thing is—they’re actually the same thing. Both are 32-bit IEEE 754 floating point numbers. So don’t expect extra precision with Double, it's just a float behind the scenes. 2. It can handle basic operations like addition, subtraction, multiplication, and division just fine. But it’s not super fast at it, since the 8-bit microcontrollers don’t have a floating point unit (FPU). That means it does all floating-point math in software, which can slow things down if you’re doing a lot of calculations in your loop. 3. Also, things like sin(), cos(), sqrt() and pow() work, but again, they’re kinda heavy on processing time. So if you’re working with sensors and need to process stuff quickly, it’s sometimes better to stick with integers where possible, or scale up the values and work in "fixed point" math if you can. 4. One more thing—printing floats with Serial.print() only shows two decimal places by default. You can control that though: float pi = 3.14159; Serial.print(pi); // prints 3.14 Serial.println(pi, 4); // prints 3.1416 So yeah, Arduino can handle floats, but it’s not optimized for heavy-duty number crunching. If you're doing more advanced math or need higher precision, better to move to something like a Teensy or a 32-bit board like the Arduino Due or even ESP32. But for basic stuff, it’s totally usable. | |||||
| Answer to: Random garbled text on Serial Monitor? | 6 Relevance | 1 year ago | Admin | Arduino | |
| Well usually, people forget to add the serial.begin() command inside the void setup. Since you’ve already matched the baud rate in your code and Serial Monitor, here are a few things to Double-check: Double-check you’re using the correct COM port in the Arduino IDE under Tools > Port. If it's wrong, it’ll seem like nothing is happening. Make sure you’re not using pins 0 (RX) and 1 (TX) for something else since they’re used for serial communication with your computer. If you're sending data too fast, the Serial Monitor can’t keep up, which might be causing the garbled output. Adding a delay() can help prevent that. | |||||
| Answer to: Measuring a transformer with an oscilloscope | 3 Relevance | 7 months ago | TechTalks | Equipments | |
| Measuring a transformer with an oscilloscope, especially in mains-powered circuits, requires caution to avoid damaging your equipment or risking personal safety. One major risk comes from grounding. Most benchtop oscilloscopes connect their probe ground clips directly to earth ground through the power cord. If you attach the ground clip to a point in the transformer circuit that isn’t referenced to earth ground—such as a floating secondary—you can unintentionally create a short circuit. This short can damage the oscilloscope, harm the transformer, or even cause electric shock. To prevent this, always ensure the oscilloscope and the circuit under test share the same ground reference. If that’s not possible, use an isolation transformer to power the circuit. This isolates it from the mains ground, allowing you to safely connect the oscilloscope. You can also use a differential probe, which measures the voltage between two points without relying on a common ground. This makes it ideal for measuring floating or ungrounded circuits. You also need to pay attention to voltage ratings. Oscilloscopes and their probes can only handle a limited amount of voltage. If you exceed that limit, you risk damaging both the probe and the oscilloscope. To stay within safe limits, use attenuating probes like 10:1 or 100:1 when working with high voltages, and always verify the maximum input ratings before connecting anything. Improper connections can also cause short circuits and overloads. If you connect probes incorrectly or create a ground loop, large currents might flow through unintended paths. This can burn out transformer windings, destroy probes, or even start fires. To stay safe, always Double-check your connections before powering the circuit. Set the oscilloscope’s input impedance correctly to avoid incorrect readings or signal distortion. When working with floating circuits, rely on isolation techniques or differential probes to create a safer test environment. If you follow these steps you can surely measure a transformer with an oscilloscope but make sure safety first. | |||||
| Why does my flip-flop circuit behave unpredictably at high frequencies? | 3 Relevance | 9 months ago | LogicLab | Theoretical questions | |
| I'm working with a basic flip-flop (using 74-series logic) in a sequential circuit, and everything works fine at lower clock speeds. But as I increase the frequency, the circuit starts behaving erratically—sometimes it misses clock edges, changes state unpredictably, or stops working altogether. I've Double-checked the wiring and power supply, and there doesn’t seem to be any loose connections. I'm not sure if it's a propagation delay issue, a problem with setup/hold times, or something else related to timing. What could be causing this kind of instability at higher frequencies? And how can I make my flip-flop circuit more reliable as the clock speed increases? | |||||
| Answer to: Why do ceramic capacitors have no polarity? | 3 Relevance | 9 months ago | Admin | Theoretical questions | |
| It's all about what they're made of inside. Basically, ceramic capacitors use a ceramic material as the dielectric (the stuff between the metal plates). This material doesn't care which WAy the electricity flows. you can hook it up forwards, backwards, sideways... it'll still work just fine. It's a "non-polarized" material. Capacitors that do have polarity, like electrolytic capacitors, are different. They use a super-thin layer of metal oxide that's created through a chemical process. This layer only works as an insulator in one direction. if you hook it ... | |||||
| Answer to: Why does my ESP8266 keep restarting? | 3 Relevance | 9 months ago | Jignesh | ESP32 | |
| ... that could cause resets. WAtchdog reset – If your code runs a long loop without delay(), yield(), or ESP.wdtFeed(), the internal WAtchdog timer will reset the ESP. Try adding a small delay(1) inside long loops. Incorrect GPIO boot states – The ESP8266 checks GPIO0, GPIO2, and GPIO15 at boot. They need to be: 1. GPIO0: HIGH 2. GPIO2: HIGH 3. GPIO15: LOW If these are wrong, the ESP may not boot properly and keeps resetting. Faulty code or firmware – A crash or corrupt firmware can cause repeated resets. Try uploading a basic sketch (like Blink) to r ... | |||||
| Answer to: How to interface a temperature sensor with an ESP32? | 3 Relevance | 9 months ago | Amelia | ESP32 | |
| This issue is common with the DHT11 on ESP32. Here’s what you can try: Use a 10K pull-up resistor between DATA and VCC (essential for signal stability). Power the DHT11 with 5V instead of 3.3V, if your module supports it (most do). Switch to the “DHTesp” library—it’s more reliable on ESP32 than the Adafruit one. Double-check wiring and ensure you're using the correct GPIO number (GPIO4, not a labeled pin like D4). Use short wires, and try another sensor if nothing works—some cheap modules are faulty. These steps usually fix the "Failed to read from DHT sensor!" issue. If the error still persist you can comment. | |||||
| How to interface a temperature sensor with an ESP32? | 3 Relevance | 10 months ago | Electronix | ESP32 | |
| Hi everyone, I'm working on my college project titled "Temperature Monitoring System using ESP32", where I'm using a DHT11 sensor to measure temperature and humidity. I connected the sensor to my ESP32 board as follows: 1. VCC to 3.3V 2. GND to GND 2. DATA to GPIO4 I installed the Adafruit DHT library, uploaded the example sketch, and opened the Serial Monitor. But instead of getting temperature readings, it keeps printing Failed to read from DHT sensor! And sometimes it shows 0.00 °C, which is wrong. I tried the following, but still couldn’t get consistent results: 1. Double-checked wiring 2. Used different GPIO pins 3. Increased delay between reads Any help would be greatly appreciated! | |||||
| Answer to: ESP32 Vs ESP8266? | 3 Relevance | 1 year ago | Admin | ESP32 | |
| Ok, I will make the choice of choosing between an ESP32 and ESP8266 as simple as possible for you: Price: If you check the online stores, the price of ESP32 is almost Double that of the ESP8266. So if you have a tight budget, ESP8266 is the more WAllet-friendly option. Processing Power: The ESP32 has dual cores and more memory, making it faster and better at handling multiple tasks. The ESP8266 has a single core, which might slow things down if your project is big. Extra Features: The ESP32 comes with Bluetooth (and sometimes more I/O pins), while the ESP8 ... | |||||
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