Notifications
Clear all
Search result for: WA 0812 2782 5310 Katalog Harga Rolling Door One Set Murah Lendah Kulon Progo
| # | Post Title | Result Info | Date | User | Forum |
| Answer to: How do I interface a 4–20 mA industrial sensor with an Arduino? | 2 Relevance | 10 months ago | TechSpark | Arduino | |
| ... voltage drop resistor. The most widely used value is 250 Ω, because it maps the 4–20 mA current range to exactly 1–5 V, which fits perfectly within the Arduino's 0–5 V analog input range. This WAy, 4 mA gives a 1 V drop, and 20 mA gives a 5 V drop across the resistor. The sensor typically has two wires: One connects to the +24 V power supply, and the other connects to One side of the 250 Ω resistor. The other side of that resistor goes to GND, which must be shared with the Arduino. To measure the voltage, the analog pin is connected to the node between the ... | |||||
| Answer to: What’s the difference between a Microprocessor and a Microcontroller? | 2 Relevance | 1 year ago | Admin | Theoretical questions | |
| ... Unit) and needs external components like memory (RAM/ROM), input/output interfaces, and peripherals to work. Think of it as what you’d find in a computer, like an Intel Core i7 or an AMD Ryzen. It’s designed for complex tasks and multitasking. Applications: Computers, laptops, and smartphones. Flexibility: You get to design the system around it by adding the components you need. Microcontroller (MCU): A microcontroller, on the other hand, is more like an all-in-one package. It includes a CPU(a processor), memory (RAM/ROM), and peripherals like GPIO pins ... | |||||
| Answer to: Best Engineering Branch for Future Job Opportunities? | 1 Relevance | 9 months ago | cooper | Theoretical questions | |
| The “best” engineering branch?It’s not CSE. It’s not ECE. It’s the One that actually excites you. Seriously. I’ve seen people chase “in-demand” branches and end up hating every semester. On the other hand, I’ve also seen students in lesser-known fields absolutely kill it—just because they enjoyed what they were doing. One of the highest earners from my batch? Not from CS or IT. They were from a niche branch most people hadn’t even heard of. Passion + effort > trend. Of course, look at job opportunities, but don’t let “scope” blind you. Every field has scope if you have the drive to make the most of it. So don’t ask “Which branch is best?”Ask “What can I see myself doing for 4 years without going insane?” | |||||
| Answer to: How to read resistor color codes? | 1 Relevance | 10 months ago | Paul | Theoretical questions | |
| A good rule of thumb when reading resistor color codes is to start from the end where the color band is closest to the lead. That first band usually marks the most significant digit, so if One side has a band that's clearly closer to the edge than the other, that’s your starting point. For instance, in many 4-band resistors, you’ll see something like red on One end and gold on the other. The gold band is usually spaced a bit farther from the edge, and since gold and silver are never used as the first digit, that’s a solid hint they mark the tolerance and should be read last. Resistors can have up to 6 color bands, with the extra Ones representing things like tolerance and temperature coefficient. These can be a bit trickier to read, but once you're familiar with the basic rules, it gets easier. Here’s a quick breakdown: 4-Band Resistor 1st Band = 1st digit 2nd Band = 2nd digit 3rd Band = Multiplier (i.e., how many zeros to add) 4th Band = Tolerance (accuracy) Example: Red (2), Violet (7), Orange (×1,000), Gold (±5%) → 27,000 ohms or 27kΩ ±5% If you still find it tricky, you can use an online calculator to make things easier: 👉Resistor Color Code Calculator | |||||
| Connecting Unequal Li-ion Batteries in Parallel | 1 Relevance | 10 months ago | Janet | Theoretical questions | |
| I'm working on a battery-powered project and came across something that seems simple but feels more complicated the more I think about it. Suppose I have two identical 3.7V Li-ion cells, both with the same capacity and chemistry, but One is sitting at 4.1V and the other at 3.9V. If I connect them directly in parallel (positive to positive, negative to negative), what exactly happens? I know current will flow from the higher voltage cell to the lower One, but: How much current are we talking about? Is there a risk of damaging the cells or causing overheating? Why doesn’t the higher-voltage cell just “wait” until they equalize gradually? Would internal resistance limit the surge, or is it still unsafe? I’m also curious how BMS (Battery Management Systems) handle this situation, and whether any passive or active balancing is required before connecting cells in parallel. If anyone has experience or insight (especially real-world examples or best practices), I’d really appreciate it! | |||||
| Answer to: Best Cheap as Possible ESP32 Boards? | 1 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! | |||||
| RE: new to electronics and needing some guidance with a circuit . 555 LED lights | 1 Relevance | 10 months ago | Admin | Circuits and Projects | |
| Hi! I checked the circuit on TinkerCad. There were some mistakes, like wrong capacitor connection and value. Here's the edited One: A couple of points worth mentioning here: 1. On running the simulation, TinkerCad shows too much current drawn from the IC and may damage it. 2. This is true if you are running it continuously. In this case, all LEDs are ON at the same time for a very small duration, so it somehow works. 3. Still, not a good idea in the long run. I will suggest: 1. Use a 220-ohm resistor instead of 100. And connect two LEDs per pin to only One resistor. Meaning a total of 8 resistors for an 8-pin. This will reduce the overall current draw from the IC and per pin as well. 2. Better use 330 ohm..but not that it will reduce the brightness of the LEDs further. | |||||
| Difference between asynchronous and synchronous resets in flip-flops? | 1 Relevance | 10 months ago | J.Smith | Theoretical questions | |
| My teacher mentioned that there's an important distinction between asynchronous and synchronous resets used in flip-flops, but I’m still a bit confused about how they actually differ in behavior. From what I understand, both types reset the flip-flop to a known state, but: How does the timing of an asynchronous reset differ from a synchronous One? When designing digital circuits or writing HDL (like Verilog or VHDL), how do I decide which type to use? Are there any pros, cons, or common pitfalls I should be aware of with either reset type? I'd appreciate a practical explanation or examples that clarify when and why One might be preferred over the other. | |||||
| Why are there two separate registers in 74HC595? | 1 Relevance | 10 months ago | Rahav | Circuits and Projects | |
| Hi,I WAs trying to understand the working of the 74HC595 Shift register, so I opened its datasheet.It has two registers(one called shift and the other One storage). But I am confused.. why do you need an extra storage register? What's the purpose of the register? How these two registers are working together to shift the O/P? Attachment : Block-diagram-of-74HC595-Shift-register.png | |||||
| Answer to: Why do ceramic capacitors have no polarity? | 1 Relevance | 10 months ago | Admin | Theoretical questions | |
| It's all about what they're made of inside. Basically, ceramic capacitors use a ceramic material as the dielectric (the stuff between the metal plates). This material doesn't care which WAy the electricity flows. you can hook it up forwards, backwards, sideways... it'll still work just fine. It's a "non-polarized" material. Capacitors that do have polarity, like electrolytic capacitors, are different. They use a super-thin layer of metal oxide that's created through a chemical process. This layer only works as an insulator in One direction. if you hook it ... | |||||
| Answer to: Difference between Wi-Fi, Bluetooth, Zigbee, and LoRa? | 1 Relevance | 10 months ago | Admin | Theoretical questions | |
| ... etc. range is basically just One room. Zigbee - this is the go-to for smart homes. think philips hue lights or smart sensors. they all talk to each other to create a bigger network (a "mesh"). super low power so batteries can last for ages. Lora - This is the long-distance king. LITERALLY means Long Range. We're talking KILOMETERS. The trade-off is you can only send tiny amounts of data. Perfect for a sensor WAy out in a field and uses almost zero power. So, For battery-powered devices? Go with Zigbee or LoRa. They're built for it. For long-range stuff ... | |||||
| Answer to: Arduino vs Teensy: Why will anyone choose Uno or Nano? | 1 Relevance | 10 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: How to use Arduino to read values from a potentiometer? | 1 Relevance | 10 months ago | Admin | Arduino | |
| ... input pin, like A0 on your Arduino This Setup allows the potentiometer to act as a voltage divider, and the middle pin will give you a variable voltage between 0V and 5V as you turn the knob. Upload this program: const int potPin = A0; void Setup() { Serial.begin(9600); } void loop() { int potValue = analogRead(potPin); // Read value (0–1023) Serial.println(potValue); // Output the value to Serial Monitor delay(100); // Small delay for readability } Once the code is uploaded, open the Serial Mo ... | |||||
| Answer to: Arduino Code Not Uploading – What Could Be the Issue? | 1 Relevance | 10 months ago | Deboojit | Arduino | |
| This is a common issue, and it usually means the Arduino IDE is unable to communicate with your board during the upload process. Here are several things you should check: 1. Check Board Selection Tools → Board – Make sure the correct board (e.g., Uno, Nano) is selected. 2. Check Port Tools → Port – Choose the correct COM port (replug board to see which One appears). 3. Use a Proper USB Cable Some cables are charge-only. Try a different One that supports data. 4. Install Drivers For clone boards (e.g., CH340), make sure USB drivers are installed. 5. Disconnect from Pins 0 & 1 Remove anything connected to RX (0) and TX (1) during upload. 6. Try Reset Press the Reset button just before or during upload (for older boards). 7. Bootloader If the board is new or a clone, it might not have a bootloader. You'll need to burn it using another Arduino. | |||||
