Ohm’s Law Calculator
Enter any two values (V, I, R). Leave one box empty and the calculator will solve for that one.
LED Resistor Sizing
Compute a series resistor for one or more LEDs in series from supply voltage, Vf, and target current.
Relay Configurator
Find relay coil current and any needed series resistor when driving a relay from a supply.
Voltage Divider Calculator
Compute Vout and divider current for R1 from Vin to Vout and R2 from Vout to ground.
Pull-Up / Pull-Down Helper
Suggests a pull resistor from supply voltage and target pull current, plus a nearby standard value.
Solstice Board Pin Mapper
Generate a pin map for any Solstice board: set pin count, label each pin, choose direction, add notes, and export as JSON for documentation or firmware work.
