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| # | Post Title | Result Info | Date | User | Forum |
| Answer to: How does PID control work in automation? | 8 Relevance | 12 months ago | Tech Geek | Theoretical questions | |
| PID (Proportional-Integral-Derivative) control is a fundamental feedback mechanism used in automation to maintain the stability and accuracy of a system. It continuously calculates an error value as the Difference between a desired setpoint and a measured process variable, then applies corrections based on three terms: proportional, integral, and derivative. The proportional term (P) reacts to the current error. It produces an output that is Directly proportional to the magnitude of the error. The larger the error, the stronger the corrective response. However, relying on proportional control alone often leaves a steady-state error, where the system stabilizes near the setpoint but not exactly at it. The integral term (I) addresses this by considering the accumulation of past errors. It integrates the error over time and adds a correction based on the sum of those errors. This helps eliminate the steady-state error and brings the output closer to the exact setpoint. However, too much integral action can cause the system to become unstable and oscillate. The derivative term (D) predicts future error by looking at the rate of change of the error. It provides a damping effect by slowing the response as the system approaches the setpoint, reducing overshoot and helping stabilize the system. A common example of PID control is in temperature regulation, such as in an oven. If the oven is set to maintain 200°C, the PID controller compares the actual temperature with the setpoint. If the temperature is too low (error), the proportional term increases the heater output. If the temperature has been low for a while, the integral term adds more power. As the temperature rises quickly, the derivative term kicks in to prevent overshooting beyond 200°C. PID controllers are widely used in industrial automation for applications like motor speed control, robotic arm positioning, pressure control in chemical processes, and flight control systems in drones. Their ability to provide precise and stable control makes them essential in systems where accuracy and reliability are critical. | |||||
| Answer to: Effect of PWM frequency on motors and LEDs | 4 Relevance | 8 months ago | nathan | Theoretical questions | |
| PWM frequency doesn’t change the basic control of speed or brightness (that’s handled by duty cycle), but it does affect how smooth and practical the control feels. For DC motors, too low a frequency can cause audible whining and jerky torque, while using a frequency in the 2–20 kHz range keeps operation smoother and moves the noise above the human hearing range. Going too high can reduce efficiency due to increased switching losses. For LEDs, low frequencies below ~100 Hz cause visible flicker, which is unpleasant and can be noticeable on cameras as well. Frequencies in the 200–500 Hz range reduce flicker significantly, but for professional lighting or Display applications, 1 kHz and above is generally preferred to ensure flicker-free performance. | |||||
| Why is LM317 still used over modern switching regulators? | 4 Relevance | 11 months ago | Suraj | Theoretical questions | |
| I’ve noticed that the LM317 linear voltage regulator is still widely used in various hobbyist and even some professional circuits, despite the availability of efficient and compact switching regulators. Considering that switching regulators offer better efficiency, less heat Dissipation, and smaller footprints, what are the reasons engineers or designers still opt for LM317 in certain designs? Is it due to simplicity, cost, noise sensitivity, or something else? | |||||
| Answer to: ESP32 vs RP2040 – Which is better after Arduino? | 4 Relevance | 1 year ago | Janet | ESP32 | |
| The table below will definitely give you an idea of what’s best for you, according to me: If your project needs wireless communication and more built-in features, the ESP32 is the better step forward.If you're experimenting on a budget or WAnt to Dive deeper into hardware control, the RP2040 is also a great pick (especially the Pico W if you still WAnt Wi-Fi). Attachment : Screenshot-1583.png | |||||
| Answer to: Program to toggle LED state with a single button? | 4 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 = ... | |||||
| Program to toggle LED state with a single button? | 4 Relevance | 1 year ago | tricky_logic | Programming | |
| ... tried using DigitalRead() in a simple if condition, but I suspect I need to debounce the button properly. Should I use delay(), or is there a better approach using millis()? Here’s my basic code: const int buttonPin = 2; const int ledPin = 13; bool ledState = false; void setup() { pinMode(buttonPin, INPUT); pinMode(ledPin, OUTPUT); } void loop() { if (digitalRead(buttonPin) == HIGH) { ledState = !ledState; DigitalWrite(ledPin, ledState); delay(200); // Debounce delay? } } Is there a more reliable ... | |||||
| Answer to: What is the maximum operating frequency? | 4 Relevance | 1 year ago | Admin | Theoretical questions | |
| Hi, You can check its datasheet for this. The maximum operating frequency depends on its internal components and architecture: M9K Embedded Memory Blocks:Maximum operating frequency: 315 MHz for Cyclone III devices. Global Clock Networks:Maximum frequency: 315 MHz. Internal Logic:Achievable frequencies depend on the design, but a typical maximum is 200 MHz, influenced by factors like logic depth and routing. | |||||
