Common Components

Common components are the parts and modules you'll most often encounter when assembling an iDryer-like device or 3D printer peripherals.

Purpose of this section:

This section serves as a reference for parts you'll actually hold in your hands during assembly.

You don't need deep electronics knowledge here. The main goal is to help you understand:

• what this component is;
• why you need it;
• how it's typically connected;
• what you can substitute it with;
• what parameters matter when buying;
• what most often breaks on first connection.

Format of each page:

• what it is;
• where it's used in iDryer and 3D printer peripherals;
• what a typical connection looks like;
• important characteristics;
• typical mistakes;
• a short checklist before buying.

Proposed files:

• 02-heaters.md - heaters: PTC, silicone pads, cartridges, 12V/24V/110-230V AC.
• 03-fans.md - fans: 2-pin, 3-pin, 4-pin PWM, voltage, current, noise, airflow.
• 04-thermistors.md - thermistors: NTC 100K, lookup tables, mounting, open/short circuits.
• 05-led-strips.md - LED strips: 5V/12V/24V, regular and addressable, current per meter.
• 06-servo-motors.md - servo motors: power, signal, angle, peak current.
• 07-load-cells.md - load cells: HX711, calibration, mechanical mounting.
• 08-oled-display.md - OLED: I2C/SPI, address, power, when needed.
• 09-touchscreen.md - TFT/touch: UART/SPI/HDMI, power, compatibility.
• 10-rfid-and-nfc.md - RFID/NFC: cards, tags, frequencies, connection.

Reference Materials

• Klipper Configuration Reference - official Klipper sections on heaters, fans, temperature sensors, servo motors and displays in configuration.
• DigiKey: Selecting A Fan - practical fan selection by airflow, static pressure, housing resistance and thermal task.
• Adafruit: MOSFET Driver - why high-power loads aren't connected directly to GPIO and why you need a power switch.
• SparkFun: Load Cell Amplifier HX711 Breakout Hookup Guide - example of load cell, HX711, power, signal wires and calibration.
• Adafruit: PN532 RFID/NFC Breakout Wiring - example of a component where you need to check power, logic levels and chosen interface beforehand.

See Also

• Heaters - the riskiest type of load: power, temperature, SSR/MOSFET and independent protection.
• Fans - airflow, static pressure, 2-pin/3-pin/4-pin and power.
• Thermistors - temperature sensor as the basis for heater feedback.
• Connecting a fan - practical example of component connection through a power switch.
• Heater and SSR errors - common mistakes with high-power and mains loads.