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embedded-systems

Sizing an LED's series resistor from supply, forward voltage, and target current

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Required by

Local knowledge map

Local knowledge map

Finding absolute maximums, recommended conditions, typical v… Producing PWM from firmware: analogWrite on the Uno R4 and the… Protecting circuits with fuses, series resistors and TVS… Reading a button on a digital input with the internal pull-up,… Using an NPN transistor as a low-side switch and… Driving a GPIO pin as a digital output within its current… Reading a board's per-pin and total GPIO current limits from… Using diodes for one-way flow, flyback protection,… Sizing an LED's series resistor from supply, forward voltage, and… Choosing a linear or switching regulator from dropout,… Computing and choosing resistors for a voltage divider's… Driving addressable LEDs: data timing, power budget per LED,… Estimating average current and battery life from a duty-cycl… Explaining how setup() and loop() run, and the main() the Arduin… Explaining the voltage spike when current through a coil is… Reading resistor values (E-series, color code),… Applying Kirchhoff's voltage and current laws to check or solv… Computing power with P = VI and checking it against a part's… Finding equivalent resistance, and the current and voltage o… Using V = IR to find a missing voltage, current, or resistance

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Solid arrows are required prerequisites; dashed are recommended or helpful. Lower rows are more foundational. Click any box to jump to that concept.