Yes, it’s possible to power an Arduino directly from a solar Panel, but not reliably without extra components. A solar Panel’s voltage and current fluctuate with sunlight, which can cause the Arduino to reset or even get damaged. To make it work safely, you’ll need at least a regulator (buck or buck-boost) to keep the voltage stable, a blocking diode to prevent reverse current at night, and some capacitors or a supercapacitor to smooth out short drops in power. Without a battery, the project may still cut off under clouds or low light, so if continuous operation is required, even a small buffer battery or supercap is highly recommended.

@neeraj-dev What do you mean by, "I’d like to have a WAll-mounted switch that can wirelessly communicate with an Arduino-based controller connected to the lights". Why do you need a WAll-mounted switch to make this project wireless?

Is it possible to power an Arduino project directly from a solar Panel without using a battery? I’m concerned about voltage fluctuations and whether the Arduino can handle them, or if additional components are required to make it work safely.

The main reason Teensy is preferred for DIY keyboards is its native USB support. Unlike most Arduino boards (like Uno, Nano, Pro Mini) that use a separate USB-to-serial chip, Teensy’s microcontrollers handle USB directly. This allows them to appear as a true USB HID device (keyboard, mouse, MIDI, etc.) without extra work. On top of that, Teensy boards generally offer more flash, RAM, and faster processors, which makes them well-suited for complex keyboard firmware like QMK or TMK that require Custom layouts, macros, and lighting effects. The Arduino Uno/Nano can’t natively emulate a keyboard without workarounds, while Teensy supports it out of the box.

I’ve seen many DIY keyboard projects where people use a Teensy microcontroller rather than popular Arduino boards like the Uno, Nano, or Pro Mini. What makes the Teensy a better choice for keyboards? Is it related to USB support, performance, or something else.

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?

Hi everyone! I'm an electrical engineering student who is new to home automation projects but has started working on one and needs some advice. I WAnt to create a system where I can control the lights in my house wirelessly. Specifically, I’d like to have a WAll-mounted switch that can wirelessly communicate with an Arduino-based controller connected to the lights. The goal is to replace the traditional wired switches with wireless ones that can send on/off commands to the Arduino, which will then control a relay to turn the lights on or off. I've researc ...

Yes, much of the heating behaviour is inherent to older bipolar-driver ICs like the L293D and L298N. Those chips use bipolar transistors (Darlington or bipolar output stages) with large voltage drops, so a significant fraction of motor power is dissipated in the chip as heat. Wiring and supply issues (thin wires, poor decoupling, undervoltage, high stall currents) can worsen the problem, but replacing the driver with a Modern MOSFET-based H-bridge or dedicated MOSFET motor driver typically reduces losses by orders of magnitude and greatly lowers heat.

I’ve been using L293D and L298N motor drivers and noticed they heat up quickly, even under light loads.Is this inherent to these older ICs, or could it be a wiring/power supply issue on my side? How much of a difference would Modern MOSFET-based drivers make in terms of efficiency and heat dissipation?

Nicely explained! Do you know if the ESP32-C3’s USB Serial/JTAG can be extended to support HID with Custom firmware, or is it strictly limited to debugging and flashing?

A capacitor is called linear because the relationship between the voltage across it and the current flowing through it is linear. The exponential curve you're seeing is its behavior over time, which is different. Here’s the breakdown: What "Linear" actually means here In circuit theory, a component is linear if it follows the rule of superposition and scaling.1 In simple terms: if you double the cause, you double the effect. For a capacitor, the relationship is defined by the equation 2I=CdtdV​.3 This means the current (4I) is directly proportional to the rate of change of voltage (5dV/dt).6 So, if you double the current going into the cap, its voltage changes twice as fast. If you halve the current, its voltage changes half as fast. That direct, proportional relationship is what makes it a linear component. So why the exponential curve? That famous exponential curve shows the capacitor's voltage versus time when it's part of a circuit with a resistor (an RC circuit). It's not a direct graph of voltage vs. current. Think about what happens when you charge it: At the start, the capacitor is empty, so a large current flows in. As it charges, voltage builds up across it. This built-up voltage opposes the source, which reduces the voltage across the resistor, and therefore reduces the current flowing into the cap. So, the charging slows down as it gets fuller. This process of "charging slower and slower as it fills up" is what creates that exponential curve. The capacitor itself is still behaving linearly at any given instant, but the behavior of the whole circuit over time is exponential. So: Component's V-I relationship: Linear. (The physics of the cap itself). Circuit's V-T response: Exponential. (The behavior you see over time in an RC circuit). Hope that clears it up!

I need a board with native USB support for HID or Custom USB projects, and I’m trying to decide between the ESP32-C3 and ESP32-S3. Do both support native USB, and which one is more reliable for this purpose?