Category Archives: Tutorials

Three parts — an LM393 rain sensor, an Arduino UNO and an SG90 servo winch — and your model clothesline pulls the laundry in the moment rain is detected.

A 180° servo moves to the angle you command and holds it; a 360° (continuous) servo cannot hold an angle at all — its write() value controls speed and direction instead. A 270° servo is simply a positional servo with a wider sweep. All three look identical from the outside, so below is a 30-second […]

If your ESP32 is not detected in Arduino IDE, the cause is almost always one of three things: a charge-only USB cable, a missing CH340 or CP2102 driver, or a board that needs its BOOT button held during upload. Swap to a proper data cable first — that one step fixes over half the cases […]

To solder header pins, push the header’s long side into a breadboard, sit the module on top, then touch a 350 °C iron to both the pad and the pin for 1–2 seconds while feeding solder into the joint — about 3 seconds per joint. A good joint looks like a shiny little volcano, and 15 […]

Your LM2596 buck converter ships at a random output — often 9V or 12V — and that is normal, not a defect. To set it to 5V, connect a 7–12V input to IN+/IN−, probe OUT+ and OUT− with a multimeter set to DC volts (the 20V range on manual meters), and slowly turn the trimmer […]