1. Two Ways to Detect a Magnet A magnet approaching a sensor can be detected in two fundamentally different ways: by using the magnetic field to physically move something, or by measuring the electrical effect of the field on a semiconductor. The first approach gives us the reed switch; the second gives us the Hall […]
1. Project Overview and Parts List The system works on a simple principle: read the soil moisture level, and if it falls below a threshold, run the pump for a fixed number of seconds. Then wait. This prevents the pump from running continuously if the sensor reading is slow to update after watering, and it […]
1. What a Stepper Motor Driver Actually Does A stepper motor is a brushless DC motor with a rotor divided into many magnetic poles and a stator wound with multiple coils. By energising those coils in sequence, you pull the rotor around in discrete angular steps — typically 200 steps per revolution for a standard […]
1. The Three Types and When to Use Each Jumper wires come in three configurations, defined by what is on each end. Understanding the difference is less about memorising names and more about recognising what each end physically does: a male end has an exposed pin that inserts into something; a female end has a […]
1. What the W1209 Is and Who It Is For The W1209 is a self-contained digital thermostat module built around an STC15F104W microcontroller. It reads temperature from an NTC thermistor, compares it against a set point you define, and switches a relay on or off accordingly. The entire decision-making loop happens inside the module’s firmware […]
1. What Is a Potentiometer? A potentiometer — often shortened to pot — is a variable resistor with three terminals. Inside the housing sits a resistive track (commonly carbon or cermet) with a fixed resistance between its two outer pins. A third pin, called the wiper, slides along that track when you rotate the shaft. […]
Why OLED Displays Are Worth Learning There is a meaningful difference between a project that blinks an LED to indicate status and one that displays a live readout of temperature, pressure, and battery voltage on a crisp, sharp screen. The SSD1306 OLED module is what makes the second kind of project accessible to beginners — […]
What the GT2 Standard Means GT2 stands for Gates Tooth profile 2 — a specific tooth geometry developed by Gates Rubber Company for their PowerGrip GT timing belt system. The “2” refers to the 2 mm pitch: the centre-to-centre distance between adjacent teeth on the belt. This 2 mm pitch is the defining characteristic of […]
Why Maintenance Matters — The Real Cost of Ignoring It A 3D printer that hasn’t been maintained doesn’t fail dramatically. It degrades. Prints that used to come out clean start showing layer shifting, then stringing worsens, then bed adhesion becomes unreliable, then a belt snaps mid-print and the part is ruined. At no single point […]
What PETG Is Chemically PETG stands for Polyethylene Terephthalate Glycol — the “G” at the end is the critical difference from standard PET, the polymer used in plastic drink bottles. Standard PET is highly crystalline, which makes it strong and barrier-resistant but also brittle and difficult to process on desktop 3D printers. Adding glycol during […]