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| # | Post Title | Result Info | Date | User | Forum |
| Shift Register Cascading Issues | 5 Relevance | 10 months ago | Electronix | Theoretical questions | |
| I'm trying to cascade multiple 74HC595 shift registers to expand the number of digital outputs in my project. While one shift register works perfectly on its own, as soon as I add the second (and especially the third), I start getting strange or inconsistent output—some LEDs don’t light up correctly, or they shift out of Order. Is there a timing issue I might be overlooking? Do I need to delay between latching and shifting? Could signal integrity or voltage drop be the issue when chaining several ICs? | |||||
| 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 | 10 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: 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 = ... | |||||
| Answer to: Looking for Reliable Sites to Buy Display Modules | 4 Relevance | 9 months ago | Dinesh bhardwaj | Arduino | |
| For college projects, you can get reliable display modules from Adafruit, SparkFun, and Digi-Key. For Budget-friendly options, Amazon and AliExpress offer plenty, but always check seller ratings. These sites cover LCD, OLED, and LED displays commonly used in student-level projects. If you’re in India, Robu.in is also a solid local option with good availability. | |||||
| 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. | |||||
| Suggestions for a Handheld or Compact Oscilloscope? | 4 Relevance | 9 months ago | PCBChronicles | Equipments | |
| I’ve mostly used benchtop oscilloscopes available in my college lab, but now I’m looking to buy a portable oscilloscope that I can easily carry around for on-site testing and general electronics work. Portability is important to me, but I don’t WAnt to compromise too much on performance or usability. Can anyone recommend a good portable oscilloscope—either handheld or tablet-style—that offers a decent balance of features, screen quality, and reliability? I’d prefer something with at least 2 channels, good battery life, and support for basic measurements lik ... | |||||
| Answer to: Best Cheap as Possible ESP32 Boards? | 4 Relevance | 10 months ago | Harper | ESP32 | |
| I've tested several ESP32 boards, both branded and ultra-cheap clones, for basic IoT projects like Wi-Fi control, sensor data logging, and general experimentation. In terms of price-to-performance, the ESP32 DevKit V1 (based on the ESP32-WROOM-32 module) remains one of the most reliable and affordable options. You can usually find it for around $4–5 on AliExpress or Amazon. It offers stable Wi-Fi, full GPIO access, and solid support in both the Arduino and ESP-IDF environments. However, some clones use low-quality voltage regulators (like the AMS1117), which can heat up or cause brownouts during Wi-Fi transmission. Another good option is the ESP32-C3 dev board, which usually costs around $3–4. It uses a RISC-V core and supports native USB, which eliminates the need for a separate USB-to-Serial chip. It's also more power-efficient, making it a great choice for battery-powered applications. The only downside is that it has fewer GPIO pins and lacks dual-core performance. If you're willing to spend a little more, the ESP32-S3 boards (typically priced at $5–7) are also worth considering. They offer advanced features like USB-OTG and AI acceleration but may be overkill for basic use cases. As for ultra-cheap boards from platforms like AliExpress or Amazon, they do work—but with some caveats. While they’re perfectly usable for most beginner and intermediate projects, you may encounter issues such as weak voltage regulators, noisy ADC readings due to poor PCB layout, and lack of auto-reset for uploading code. Some of these boards also come with obscure USB-to-Serial chips, so it's better to stick with ones using CH340 or CP2102. When buying ultra-budget boards, look for those that use genuine Espressif modules (usually marked “ESP32-WROOM” on the metal shield), and always check seller ratings or community feedback. I hope this information will help you choose the right one! | |||||
| ESP32 Vs ESP8266 - Which one to choose? | 4 Relevance | 1 year ago | Nitin arora | ESP32 | |
| I am a college student working on a project that requires a Wi-Fi-enabled microcontroller, but I am unsure whether to choose the ESP8266 or ESP32. I WAnt to understand how they compare in terms of processing power, memory, and additional functionalities. Also, since the Budget is a factor, would the ESP8266 still be a good option, or is it worth spending more on the ESP32? Which one would be more suitable for a college project? | |||||
| Answer to: Good circuit simulation softwares- Any suggestions? | 4 Relevance | 2 years ago | nathan | Softwares | |
| If you're looking for free simulation software, I’d recommend LTspice; however, it lacks built-in Arduino support. For a professional option, OrCAD and Proteus are great choices. There are also many other options available at a moderate Budget that you could try. | |||||
| Answer to: Can anyone suggest a new ESP32 board? | 4 Relevance | 10 months ago | Rashid | ESP32 | |
| ... also the P4-Function-EV-Board if you WAnt to experiment with multimedia interfaces or build smart displays (it supports a 7-inch touchscreen). For IoT stuff, ESP32-C6 is really Catching on. It supports Wi-Fi 6, BLE 5.3, Thread, and is Matter-ready. Boards like the XIAO ESP32C6 (from Seeed) or the ESP32-C6 DevKitC-1 from Espressif are solid picks if you're working on low-power or Matter-based devices. Also worth mentioning: 1.Arduino Nano ESP32: Compact, beginner-friendly, and based on the ESP32-S3. 2.ESP32-S3-BOX-3: Powerful AIoT dev kit in a ni ... | |||||
