Maker tools.
Free interactive calculators, pinout viewers, and BOM builders. Every result links to the parts on Manila shelf.
LED resistor calculator
Compute current-limiting resistor for any LED. E12/E24 snap. Wattage recommendation.
open → viewerPinout viewer
Interactive pinout for ESP32 DevKitC, Pi Pico W, Arduino UNO R3, Raspberry Pi 5. Filter by function.
open → builderBOM-to-cart
Paste a parts list. One click adds the whole project to your cart. Live stock lookup.
open → calculatorVoltage divider
Pick R1 + R2 to drop a voltage from any rail. E12/E24 snap, power + current draw.
open → decoderResistor color code
4 / 5 / 6-band resistor color picker. Tolerance + temp coefficient. (Tab on LED calc.)
open → calculatorBattery life
Runtime from capacity (mAh) + duty cycle + sleep current. Efficiency factor.
open → checkerLogic-level checker
3.3V ↔ 5V compatibility. Recommends shifter / divider / direct connect.
open → calculatorPCB trace width
IPC-2221 minimum trace width for a given current + copper weight + temp rise.
open →Building something?
2,394 parts on Manila shelf. Same-day ship before 4 PM weekday cutoff.