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| # | Post Title | Result Info | Date | User | Forum |
| Answer to: Best Cheap as Possible ESP32 Boards? | 1 Relevance | 7 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! | |||||
| RE: New Pi Pico 2 by Raspberry Pi—What are your opinions? | 1 Relevance | 1 year ago | nathan | RPi Pico | |
| @sebastian Talk about being negative. It's priced at $5- $1 more than the original Pico and WAy cheaper than any original Arduino Board. And did you forget about RISC-V. I don't think any sane person will prefer PICO 1 over PICO 2 | |||||
| RE: Is Arduino still relevant in 2024? | 1 Relevance | 2 years ago | Harper | Arduino | |
| I totally agree with Jeff. Building a custom PCB including a microcontroller chip for a personal project such as automating your room is one thing and you may even save a few bucks than buying the dev Board separately. But when you WAnt to sell this product to consumers that's a whole different story. You can't possibly think that assembling some parts on 10 PCBs and saving money is anything like doing business. It takes a lot to create a profitable business out of this. | |||||
| Maximum current limitation of a digital pin on UNO | 1 Relevance | 2 years ago | Harper | Hardware/Schematic | |
| Hey folks, I'm new to Arduino and tinkering with digital pins for a project. I'm trying to control a DC motor that I've hooked up to one of the digital pins. I've heard it's important to stay within the current limits of the pins, around 40mA per pin. Can someone confirm this for me? And also, what happens if I exceed this limit while powering the motor? Will it damage my Board? | |||||
| RE: new to electronics and needing some guidance with a circuit . 555 LED lights | 1 Relevance | 8 months ago | basilwatson | Circuits and Projects | |
| @ankunegi Thank you Really appreciative of the reply. Interesting about "Ai" ,,,i asked it many times and the circuits I got back even I could see were Junk So here is the Tinkercad link ... No bread Board, just in desperation , randomly joining things together to see if I get a response. I hope this link works .... Now bass usual for me ,,, I have probably , A; over looked the obvious ...B; done something stupid, Im looking forward to finding out .... My guess is Ive got the pins round the wrong WAy.... Thanks in advance Stephen | |||||
| Answer to: How does Arduino handle floating-point operations? | 1 Relevance | 8 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: Arduino vs Teensy: Why will anyone choose Uno or Nano? | 1 Relevance | 8 months ago | Admin | Arduino | |
| Spoke like a beginner 😉 Teensy definitely has WAy more power—faster processor, more memory, better I/O—but honestly, most people don’t need all that for basic projects. Uno and Nano are just simple and work straight out of the box. Like if you're just blinking LEDs, reading sensors, or making a small robot, a Nano does the job perfectly. Also, there’s just so much support for Uno and Nano. Almost every beginner tutorial or sensor breakout example online is written for those Boards. You plug it in, upload the sketch, and it works. Teensy is awesome ... | |||||
| Answer to: Good Arduino IoT projects for a beginner? | 1 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 ... | |||||
| Answer to: How do you design a PCB for high-frequency circuits? | 1 Relevance | 8 months ago | LogicLab | Theoretical questions | |
| You're absolutely right—when moving into high-frequency PCB design (in the MHz to GHz range), layout becomes critical for ensuring signal integrity and performance. At these frequencies, traces behave like transmission lines, so maintaining controlled impedance is essential. For most RF applications, a 50-ohm microstrip or stripline trace is standard, and you’ll need to calculate trace width based on your PCB stack-up, dielectric material, and copper thickness. Trace layout should avoid right-angle bends, use 45° angles or curves, and keep high-speed traces as short and direct as possible. Differential signals (like USB or LVDS) require matched trace lengths and consistent spacing to maintain impedance and minimize skew. The PCB stack-up plays a huge role in high-frequency performance. It's best to place signal layers adjacent to solid ground planes to provide a continuous return path and minimize loop area, which helps reduce EMI. A 4-layer or higher Board with dedicated power and ground planes is generally recommended. When choosing a stack-up, consult your PCB fabricator to ensure the dielectric thicknesses and materials support your impedance requirements. Common mistakes in high-speed PCB design include failing to provide a solid ground reference under signal traces, using excessive or poorly placed vias that introduce unwanted inductance, and improperly terminating high-speed lines, which can result in reflections and ringing. Power integrity is also crucial—decoupling capacitors should be placed close to power pins, and using a mix of values helps cover a wider frequency range. Lastly, improper grounding between analog and digital sections can lead to noise coupling, so careful partitioning or single-point grounding is advised. With proper attention to these details and the use of simulation tools, designing high-frequency PCBs becomes much more manageable and repeatable. | |||||
| Answer to: Raspberry Pi Pico vs ESP32? | 1 Relevance | 9 months ago | DabieTech | RPi Pico | |
| If you prefer a Board that maintains a workflow similar to the Arduino Uno or Nano, the Raspberry Pi Pico offers a familiar development experience. It supports both C/C++ and MicroPython, making it a great option for experimenting with new programming environments while retaining a simple and straightforward approach to hardware control. Its Programmable I/O (PIO) feature also opens the door to custom protocol development and precise timing applications, which aren’t easily achievable on traditional Arduino Boards. On the other hand, if you're ready to explore more advanced capabilities such as Wi-Fi and Bluetooth connectivity, multitasking, or real-time data streaming, the ESP32 provides significantly more flexibility. It supports multiple programming environments—including the Arduino IDE—while offering powerful hardware features like dual-core processing, built-in wireless communication, touch sensors, and high-resolution ADCs. While the development process might initially seem more involved due to the richer feature set, the ESP32 is well-suited for complex or connected projects and offers long-term value for those interested in expanding their skill set. | |||||
| How to interface a temperature sensor with an ESP32? | 1 Relevance | 9 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: Are there any Arduino-compatible Wi-Fi modules that support 5GHz? | 1 Relevance | 10 months ago | TechPulse | Arduino | |
| You see, most of the Mainstream Boards don't support it, there are a few options: ESP32-C6 and ESP32-C5 (newer chips by Espressif) are designed to support both 2.4GHz and 5GHz. However, they are relatively new and not yet as widely available or supported in the Arduino ecosystem as the original ESP32. Other options include using more powerful SBCs (Single-Board Computers) like Raspberry Pi, which can support dual-band Wi-Fi and integrate with Arduino if needed. | |||||
| Answer to: Difference Between delay() and millis() in Arduino? | 1 Relevance | 12 months ago | Admin | Programming | |
| In-depth explanation of delay() VS millis() in Arduino: What is delay()?The delay(ms) function is a simple WAy to pause your program for a specific duration (in milliseconds). While using delay(), the microcontroller does nothing except WAit, effectively blocking all other code execution. Example: Blinking an LED using delay()Here’s a basic example of using delay() to blink an LED every second: const int ledPin = 13; void setup() { pinMode(ledPin, OUTPUT); } void loop() { digitalWrite(ledPin, HIGH); // Turn LED on delay(1000); // WAit for ... | |||||
| Answer to: Arduino UNO R4 Wi-Fi Project ideas! | 1 Relevance | 1 year ago | Admin | Arduino | |
| ... on a web interface.2. Remote-Controlled LEDs – Create a simple web-based LED controller using the Board’s Wi-Fi, allowing you to turn LEDs on/off from your phone.3. Wireless Sensor Hub – Connect multiple sensors (LDR, temperature, gas) and send the data wirelessly to another device using MQTT. Intermediate Projects 4. IoT-Based Smart Lock – Use an RFID module or fingerprint sensor to control a servo-motorized lock, with access logs stored on a cloud database.5. Real-Time Data Logger – Log sensor readings onto an SD card and simultaneously send them to Goo ... | |||||
| Answer to: RAM VS ROM VS Flash memory in Microcontrollers like Arduino? | 1 Relevance | 1 year ago | Kanishk | Hardware/Schematic | |
| Think of these memory types in this WAy: const int myConstant = 42; // Stored in Flash (permanent) int myVariable = 10; // Stored in SRAM (temporary) EEPROM.write(0, 25); // Stored in EEPROM (permanent small data) Flash: Where the program itself is stored (const values stay here too). SRAM: Where runtime variables live (int myvariable). EEPROM: Stores values permanently (but with limited writes). ROM (bootloader in Flash): Loads your program when the Board starts. If you turn off the power, only Flash and EEPROM keep their data, while S ... | |||||
