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| # | Post Title | Result Info | Date | User | Forum |
| Why hasn't Arduino added a USB-C port to the UNO R3? | 3 Relevance | 2 years ago | Yvette | Hardware/Schematic | |
| Hello everyone, Arduino still uses USB Type-B instead of the latest USB-C, and to me, it doesn't seem like there's a particular reason for sticking with the older port. Why haven’t they changed it? Are there specific technical or design considerations that have influenced this decision? | |||||
| Answer to: How do you safely discharge a big capacitor? | 3 Relevance | 6 months ago | CircuitSphere | Theoretical questions | |
| Firstly, don’t try to discharge a large capacitor by shorting it directly, as that can damage the capacitor and possibly hurt you. The safe WAy is to use a resistor with a suitable value (for example, 10 kΩ–100 kΩ, a few WAtts). Connect it across the capacitor terminals and let the voltage bleed off slowly. Always confirm with a multimeter that the voltage has dropped close to zero before handling the circuit. This WAy you stay safe, and the capacitor stays intact. | |||||
| Answer to: Do I really need anti-static precautions when handling ICs? | 3 Relevance | 7 months ago | Anju | Theoretical questions | |
| Yes, you do. Static electricity, even in amounts you can't feel, can permanently damage or destroy sensitive ICs. Many components, especially CMOS-based ICs, have extremely low ESD (Electrostatic Discharge) tolerance — sometimes as low as 100 volts, while a static discharge from your finger can exceed 3,000 volts. Damage isn't always immediate; latent defects caused by ESD can reduce the lifespan or cause intermittent failures later. Taking anti-static precautions like using a grounded wrist strap, anti-static mat, and proper storage methods is essential to prevent both immediate and future component failure. | |||||
| Answer to: What is bandwidth in oscilloscope? | 5 Relevance | 1 year ago | Rashid | Equipments | |
| ... few key points below: Signal Accuracy: If your oscilloscope's bandwidth is too low, it will attenuate (weaken) higher-frequency components, distorting the signal shape. Capturing Fast Transients: Digital signals (like square WAves) contain high-frequency harmonics. Insufficient bandwidth causes edges to round off, making it hard to analyze fast transitions. Noise and Spikes: A higher-bandwidth scope can reveal high-frequency noise, while a lower-bandwidth scope might filter it out. A general rule is to select an oscilloscope with a bandwidth at least 5 ... | |||||
| Answer to: Difference between EEPROM and Flash? | 5 Relevance | 1 year ago | Admin | Hardware/Schematic | |
| Both are very different from each other. Here's how: Flash Memory Purpose: Primarily used to store the program (firmware) that runs on the microcontroller. Access Method: Works at the block level, meaning you write or erase data in chunks, not byte by byte. Endurance: Lower than EEPROM, typically around 10,000 to 100,000 write/erase cycles per block. Speed: Faster read speeds compared to EEPROM. Capacity: Much larger than EEPROM (e.g., Arduino Uno has 32 KB of Flash memory). EEPROM (Electrically Erasable Programmable Read-Only Memory) Purpose: Designed to store small amounts of data that need to be saved even when the power is off (e.g., device settings or user preferences). Access Method: Data is accessed and written byte by byte, making it perfect for small, frequently changing data. Endurance: It has a high write endurance, typically allowing 100,000 to 1,000,000 write/erase cycles. Speed: Slower compared to Flash. Capacity: Usually much smaller (e.g., Arduino Uno has only 1 KB of EEPROM). What is their purpose in Arduino boards? Flash Memory: This is where your Arduino sketch is stored when you upload it via the IDE. If you need to store constant data like lookup tables, you can use Flash with the PROGMEM directive. EEPROM: You can use it to store user-defined values like calibration data or device settings using the EEPROM library to store it permanently. | |||||
| RE: What exactly is PWM resolution ? | 3 Relevance | 1 year ago | Admin | Hardware/Schematic | |
| @FullBridgeRectifier Thanks for clarifying this. To summarize, there’s a subtle but important distinction here between “how many counts the hardware timer cycles through” (which is indeed 2^n counts) versus “how you usually compute the duty‑cycle fraction” (which typically uses 2^n − 1 in the denominator so that the maximum register value maps to 100 %). I have edited my answer and added the explanation for this as well. | |||||
| RE: What exactly is PWM resolution ? | 3 Relevance | 1 year ago | Sebastian | Hardware/Schematic | |
| Good point by @FullBridgeRectifier . Just to clarify for anyone new to this: when we say “divide by 255 instead of 256,” it’s because we’re looking at the maximum value the PWM can take, not the total count of values. This WAy, your duty cycle calculations always correctly reach 100%. | |||||
| Answer to: Why Does analogWrite Use a 0-255 Range for PWM? | 3 Relevance | 2 years ago | Sebastian | Programming | |
| To the point answer by Techtalks. Just WAnt to add one important point here: The PWM pins on UNO have an 8-bit resolution. This gives us 256 discrete duty cycles, since 2^8 = 256. Example: 2 bit means 4 possible duty cycles. For PWM, they would be: 0, 33.33%, 66.66%, and 100%. Similarly, 4-bit means 16 duty cycles, and 8-bit means 256 cycles. Now why does the PWM range from 0 to 255 and not 256? Because when you count 0, the total values from 0 to 255 are 256. | |||||
| Answer to: Why Does analogWrite Use a 0-255 Range for PWM? | 5 Relevance | 2 years ago | TechTalks | Programming | |
| Hello paul, In Arduino, the analogWrite function is used to generate a PWM signal on a specified pin. The value parameters ranging from (0-255) you provide determines the duty cycle of the PWM signal. Value of 0: This means the pin is always off (0% duty cycle). Value of 255: This means the pin is always on (100% duty cycle). Values between 0 and 255: These values correspond to duty cycles between 0% and 100%. For example, a value of 127 would create a 50% duty cycle. This allows for precise control of analog devices, such as LEDs or motors, using digital signals. | |||||
| Answer to: Can i use EN pins for PWM speed control in L298N Motor driver? | 5 Relevance | 2 years ago | Admin | Hardware/Schematic | |
| Yes, you can hook these pins to the PWM pin on Arduino. The Enable pin on the L298N acts as a gatekeeper for the power supplied to the motor. When the pin is set HIGH, the motor is enabled and can run. When set LOW, the motor is disabled and stops. By connecting the Enable pin to a PWM-capable pin on the Arduino and sending a PWM signal, you can control the effective voltage supplied to the motor. This changes the speed of the motor: A higher duty cycle (e.g., 100%) means the Enable pin is HIGH most of the time, allowing full power to the motor and thus full speed.A lower duty cycle (e.g., 50%) means the Enable pin is HIGH only half the time, reducing the average power supplied to the motor and thus reducing the speed. Here's an example that demonstrates how to set up and control the motor speed connected to A channel: // Define pins const int ENA = 9; // PWM pin for Motor A const int IN1 = 8; // Direction pin 1 for Motor A const int IN2 = 7; // Direction pin 2 for Motor A void setup() { // Set pin modes pinMode(ENA, OUTPUT); pinMode(IN1, OUTPUT); pinMode(IN2, OUTPUT); } void loop() { // Set motor direction digitalWrite(IN1, HIGH); digitalWrite(IN2, LOW); // Set motor speed using PWM analogWrite(ENA, 127); // 50% duty cycle, half speed delay(2000); // Run for 2 seconds // Change motor speed analogWrite(ENA, 255); // 100% duty cycle, full speed delay(2000); // Run for 2 seconds | |||||
| Answer to: Multimeter continuity beeps with no contact — false positives? | 3 Relevance | 7 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: Good Arduino IoT projects for a beginner? | 3 Relevance | 8 months ago | Admin | Arduino | |
| Start with these simple IoT projectsJust Type the project name in Google search.Tip: The best WAy to dive into IoT projects is to use an ESP32 board and program it using Arduino IDE. Smart Plant Monitoring SystemMonitor soil moisture, temperature, and humidity, and send data to the server in real time. Wi-Fi Controlled Home AutomationUse an Arduino and a relay module to control lights and fans via a web browser IoT Weather Station with DHT & BMP SensorsCreate a weather station that logs humidity, temperature, and pressure online using sensors li ... | |||||
| Need help with the working of this circuit | 3 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 | |||||
| Answer to: How does a piezoelectric sensor generate voltage? | 3 Relevance | 1 year ago | Deboojit | Theoretical questions | |
| Piezoelectric sensors convert mechanical force into electrical energy. They work using the piezoelectric effect, which occurs in certain materials with a unique crystal structure. When you press, squeeze, or vibrate these materials, their internal charges shift, creating a voltage across the material. The amount of voltage they generate depends on several factors, including the amount of applied force, the Type of piezoelectric material used, and the sensor’s shape and thickness. If the vibrations match the material’s natural frequency, the voltage output can get a significant boost. Temperature also plays a role, as some materials are more stable than others. Additionally, how the sensor is connected to a circuit affects how much charge it stores and releases. That’s why these sensors are commonly found in devices like accelerometers, microphones, ultrasound equipment, and even energy-harvesting gadgets. | |||||
| Answer to: RAM VS ROM VS Flash memory in Microcontrollers like Arduino? | 3 Relevance | 1 year ago | Admin | Hardware/Schematic | |
| ... sketch, it gets stored here permanently. It's like the hard drive on your computer – it keeps the code even when you turn the power off. So, when you power your Arduino back on, it knows what to do because the code is safe and sound in the Flash. SRAM (like RAM on your computer): This is your Arduino's working memory. When your code runs, it uses SRAM to store variables, temporary values, and all the stuff it needs to keep track of while it's running. Think of it like your computer's RAM – it's super fast, but it's volatile. That means when you turn the po ... | |||||
