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| # | Post Title | Result Info | Date | User | Forum |
| DIY an RF power meter Based on STM32F103 + MAX4003 | 3 Relevance | 1 month ago | anselbevier | Hardware/Schematic | |
| ... for beginners who are new to RF like me, and even the cheapest RF power meters cost hundreds of RMB. For electronics enthusiasts who follow the principle of "spend when you should, save when you can", DIYing an RF power meter is a great alternative. The first step WAs to define the functions and design the hardware circuit. To test RF power, a chip called a detector is required. I had not found a suitable option for a long time as it WAs my first time working with an RF detector, until I saw the power detection module on the E25-C test baseboard, which use ... | |||||
| RE: What is bandwidth in oscilloscope? | 3 Relevance | 9 months ago | Rashid | Equipments | |
| You're right—3x can be fine for clean sine WAves. The 5x rule is mainly for digital signals or sharp edges where higher harmonics matter more. Depends on the signal Type and what you're measuring. | |||||
| Can I use Analog pins as digital output pin? | 3 Relevance | 10 months ago | Rahav | Programming | |
| Is it possible to use analog pins as digital output? If yes, how to do this? I mean what command should I Type? | |||||
| How can I build a basic RC car using Arduino? | 3 Relevance | 1 year ago | PCBChronicles | Arduino | |
| I WAnt to create a simple RC car using Arduino and need some guidance on the necessary components and setup. The plan is to control the car wirelessly but am unsure whether Bluetooth, RF, or Wi-Fi would be the best option. Additionally, I would like to know which Arduino board would be most suitable for this project and what Type of motor driver should be used to control the DC motors. If there are any recommended libraries, circuit diagrams, or example codes to help get started, I would appreciate any suggestions. | |||||
| Answer to: STM32 vs Arduino: Which One is Better? | 3 Relevance | 1 year ago | electronicb_brain | Hardware/Schematic | |
| I think it really depends on the Type of projects you're working on. If you're mainly doing simple LED displays, motor control, or basic IoT projects, Arduino boards are perfect. They’re simple and get the job done without much hassle. But if you WAnt to dive into audio processing, real-time data acquisition, or anything that requires heavy computation, STM32 is a beast. I switched over when I started working on a DIY oscilloscope project because I needed faster ADC and more memory. | |||||
| Answer to: Multimeter continuity beeps with no contact — false positives? | 3 Relevance | 9 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: How to calculate decoupling capacitor values? | 3 Relevance | 10 months ago | Neeraj Dev | Theoretical questions | |
| Decoupling capacitors are essential for stabilizing the power supply and suppressing noise in microcontroller and digital circuits. A common starting point is placing a 100 nF ceramic capacitor (X7R Type recommended) close to the Vcc and GND pins of each IC to handle high-frequency transients. To support sudden current demands and filter lower-frequency noise, it's also good practice to add a bulk capacitor—typically 1 µF to 10 µF—near the microcontroller or groups of ICs. The exact values depend on several factors, including the switching speed of the ICs, current consumption, and the quality of the PCB layout. Faster ICs may require additional smaller capacitors like 10 nF or 1 nF in parallel with the 100 nF to cover a broader frequency range. High-current circuits may benefit from larger bulk capacitors up to 47 µF. Proper placement is critical—capacitors should be located as close as possible to the power pins, with short, direct traces. Using a mix of capacitor values in parallel helps improve overall decoupling performance. While 100 nF is a solid default, evaluating layout and load conditions can help you fine-tune your choices for a more robust and reliable design. | |||||
| Answer to: Good Arduino IoT projects for a beginner? | 3 Relevance | 10 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 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. | |||||
| Difference between active and passive buzzer and how to identify them? | 3 Relevance | 2 years ago | Paul | Theoretical questions | |
| I'm working on a project based on a tank WAter level control system. I need to include a buzzer for sound alerts, but I know nothing about buzzers. I've come across active and passive buzzers, but I'm not sure which one would be the best choice for this project. Can anyone provide information on which would be more suitable, the key differences between active and passive buzzers, and how to identify each Type? | |||||
| 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: 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 ... | |||||
