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| # | Post Title | Result Info | Date | User | Forum |
| Answer to: How do I interface a 4–20 mA industrial sensor with an Arduino? | 13 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: Can i use EN pins for PWM speed control in L298N Motor driver? | 11 Relevance | 2 years ago | Admin | Hardware/Schematic | |
| Yes, you can hook these pins to the PWM pin on Arduino. The Enable pin on the L298N acts as a gatekeeper for the power supplied to the motor. When the pin is Set HIGH, the motor is enabled and can run. When Set LOW, the motor is disabled and stops. By connecting the Enable pin to a PWM-capable pin on the Arduino and sending a PWM signal, you can control the effective voltage supplied to the motor. This changes the speed of the motor: A higher duty cycle (e.g., 100%) means the Enable pin is HIGH most of the time, allowing full power to the motor and thus full speed.A lower duty cycle (e.g., 50%) means the Enable pin is HIGH only half the time, reducing the average power supplied to the motor and thus reducing the speed. Here's an example that demonstrates how to Set up and control the motor speed connected to A channel: // Define pins const int ENA = 9; // PWM pin for Motor A const int IN1 = 8; // Direction pin 1 for Motor A const int IN2 = 7; // Direction pin 2 for Motor A void Setup() { // Set pin modes pinMode(ENA, OUTPUT); pinMode(IN1, OUTPUT); pinMode(IN2, OUTPUT); } void loop() { // Set motor direction digitalWrite(IN1, HIGH); digitalWrite(IN2, LOW); // Set motor speed using PWM analogWrite(ENA, 127); // 50% duty cycle, half speed delay(2000); // Run for 2 seconds // Change motor speed analogWrite(ENA, 255); // 100% duty cycle, full speed delay(2000); // Run for 2 seconds | |||||
| How do I interface a 4–20 mA industrial sensor with an Arduino? | 10 Relevance | 10 months ago | Electronix | Arduino | |
| I’m building a data logger using an Arduino and a few Industrial sensors that output 4–20 mA current signals. Since the Arduino reads voltage on its analog pins, I plan to use resistors to convert the 4–20 mA current into a measurable voltage (0–5V range). Before I proceed, I’d appreciate some guidance: What resistor value is commonly used to convert 4–20 mA into a voltage safely readable by the Arduino ADC? Can I connect multiple sensors directly to separate analog pins using individual resistors? Do I need to worry about electrical isolation, common ground issues, or signal interference? Are there any recommended protection or filtering techniques for accurate readings? If anyone has a proven approach, example circuit, or tips for reading multiple 4–20 mA signals reliably with Arduino, I’d love to hear them. | |||||
| What does it mean to “set the trigger” on an oscilloscope? | 9 Relevance | 11 months ago | Nitin arora | Equipments | |
| I'm troubleshooting a communication circuit and often hear people say to “set the trigger” on the oscilloscope. I’m confused—what’s the difference between just connecting the scope and actually Setting the trigger? What does the trigger do, and how does it help in viewing signals properly? | |||||
| Answer to: STM32 vs Arduino: Which One is Better? | 3 Relevance | 11 months ago | Kanishk | Hardware/Schematic | |
| Arduino is excellent for beginners, rapid prototyping, and educational purposes. Its simplicity, massive community support, and easy-to-use libraries make it ideal for getting started with embedded systems. You can quickly connect sensors, write basic logic, and see results — no steep learning curve involved. STM32, however, is a more powerful and professional-grade platform. It’s widely used in Industrial, automotive, and consumer electronics (e.g., car ECUs, VR systems like Oculus, drones, and medical devices). By working with STM32, you gain exposure to ARM Cortex-M cores, which are the backbone of many real-world embedded applications. | |||||
| Answer to: What are interrupts in Arduino, and how are they used? | 9 Relevance | 11 months ago | Admin | Arduino | |
| ... to bake a cake. Your loop() function is carefully measuring flour, mixing ingredients, and so on. Now, what if the doorbell rings? Without interrupts (the loop() WAy): You'd have to finish a major step in your recipe (like mixing the batter) and then quickly run to the door to check if anyone is there. If your recipe step takes a long time, your visitor might get impatient and leave. This is called polling – repeatedly checking the state of something. With interrupts: The moment the doorbell rings, you'd immediately pause what you're doing (even if you're ... | |||||
| Answer to: What does it mean to “set the trigger” on an oscilloscope? | 7 Relevance | 11 months ago | Deboojit | Equipments | |
| When you simply connect an oscilloscope to a signal, the screen may show a WAveform that appears unstable, jittery, or rolling. This happens because the scope doesn’t know when to start drawing each WAveform—it just keeps refreshing as data comes in. That’s where the trigger comes in. The trigger tells the oscilloscope when to begin drawing the WAveform on the screen. It locks the display to a specific event—like when the signal crosses a certain voltage level going up (rising edge) or down (falling edge). By doing this, it ensures that each sweep starts a ... | |||||
| Answer to: BJT VS MOSFET- Current controlled vs Voltage controlled | 3 Relevance | 11 months ago | TechTalks | Theoretical questions | |
| MOSFETs are great for fast switching and are commonly used in inverter circuits, DC-DC converters, and motor drivers — up to a few hundred volts and moderate power levels. But when you start dealing with high voltages and power (like in Industrial inverters or motor drives), IGBTs are preferred. They’re not as fast as MOSFETs but handle high voltage and current better. | |||||
| Answer to: What is the role of CoAP in IoT? | 3 Relevance | 11 months ago | Tech Geek | Theoretical questions | |
| CoAP (Constrained Application Protocol) is designed specifically for resource-constrained IoT devices and networks. It’s preferred over HTTP because it’s lightweight, uses UDP (not TCP), and has lower overhead, making it ideal for low-power devices and lossy networks. Compared to MQTT, CoAP is better for request/response models and supports multicast and built-in resource discovery. It’s commonly used in constrained environments like smart homes, Industrial sensors, or low-power mesh networks. | |||||
| Answer to: ESP32 or STM32: Which is better for IoT? | 3 Relevance | 1 year ago | Harper | ESP32 | |
| I would recommend the STM32 for its robust peripherals, low power consumption, and scalability in Industrial or high-performance applications. | |||||
| Answer to: Is it safe to use the multimeter’s amp setting on live circuits? | 2 Relevance | 7 months ago | Neeraj Dev | Equipments | |
| Definetly not, Dont switch to amps or move the red lead to the A/10A jack while your probes are on a live circuit. In A mode the meter is basically a short; flipping to it or probing voltage with the lead in A can blow the fuse, make an arc, or worse. Set the meter and leads with power off, break the circuit, insert the meter in series, then power up. For mains, use a clamp meter; for 12 V high-current systems be extra cautious or use a clamp/shunt. And always move the red lead back to V when you’re done to avoid the classic “next-time short.” | |||||
| DIY an RF power meter Based on STM32F103 + MAX4003 | 7 Relevance | 2 months 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 ... | |||||
| Answer to: What are some innovative ways to use an HC-SR04 ultrasonic sensor? | 2 Relevance | 12 months ago | abhinav singh | Arduino | |
| There are a lot of WAys you can use the HCSR04 Ultrasonic sensor. Try making a gesture-controlled light switch—wave your hand to turn it on! Or build a musical instrument that changes pitch based on how far your hand is. If you WAnt something practical? Try to Set up a smart trash can that opens when you get close, or count how many times you do push-ups with a sensor tracking your chest movement. You could even rotate it on a servo to scan a room like a mini radar. The possibilities are endless. | |||||
| How to interface a 16x2 LCD with Arduino without a potentiometer? | 2 Relevance | 1 year ago | CircuitFlow | Arduino | |
| I'm trying to connect a 16x2 LCD to an Arduino Uno, but I currently don't have a 10k potentiometer (the one usually connected to the VO pin) to adjust the contrast. Is there a reliable WAy to control the contrast without using a potentiometer? For example, can I use a fixed resistor, or is there a WAy to Set contrast through software or a PWM pin? I'd really appreciate your suggestions if anyone has tried this or has a workaround that works well. Thanks! | |||||
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