Step Switch with LED - Three Pack of Blue Plastic with Red LED

These hinged momentary step switches are evocative of the 16-step sequencer keys on TR-808 sythesizers. Also sometimes used on A/V equipment, they're very tactile, with a good clicky feel.

COM A
One of the two common/pole pins for the momentary SPDT step switch. Adafruit states two of the four switch pins act as the common and connect to one of the throws when pressed; use continuity testing or the product diagram for exact PCB footprint orientation.
Type · switch contact
COM B
Second common/pole pin for the same momentary SPDT switch mechanism, provided as part of the four mechanical/electrical switch legs. Exact physical footprint orientation is diagram-dependent.
Type · switch contact
THROW 1
One throw contact of the SPDT switch. The common pins naturally connect to one or the other throw depending on button state.
Type · switch contact
THROW 2
Second throw contact of the SPDT switch. The product page describes the switch as momentary SPDT with two commons and two throws.
Type · switch contact
LED anode
Positive side of the built-in red indicator LED in the step switch. Drive with current limiting.

Start wiring

I2S · SPI · Red LED forward voltage about 2.1V to 2.3V, 20mA max per Adafruit product page.

Verify supply voltage and logic levels before powering up.

Related groups

4 groups

Connectors

Sort passive connector adapters from Qwiic boards, LCD modules and microSD card adapters before assuming anything with the right plug will substitute safely.

Connectors & cables · Connectors · 28 parts

Displays

Character LCDs, SPI TFTs, e-paper modules and larger capacitive-touch TFT panels solve different display jobs. Treat display class, interface, controller, resolution, touch, refresh behaviour, storage, voltage and mounting as separate swap checks.

Displays · TFT & LCD displays · 35 parts

Air quality

Choose between MQ gas sensors, VOC/eCO2 indoor-air sensors, true CO2 modules and particulate sensors without treating every air-quality breakout as the same detector.

Sensors · Gas & air-quality sensors · 31 parts

MCUs and boards

ESP32, Arduino Uno, Raspberry Pi Pico, and compatible add-on boards for running builds.

Boards · Microcontroller boards · 25 parts

Pin	Type	Function	Voltage
COM A	switch contact	One of the two common/pole pins for the momentary SPDT step switch. Adafruit states two of the four switch pins act as the common and connect to one of the throws when pressed; use continuity testing or the product diagram for exact PCB footprint orientation.
COM B	switch contact	Second common/pole pin for the same momentary SPDT switch mechanism, provided as part of the four mechanical/electrical switch legs. Exact physical footprint orientation is diagram-dependent.
THROW 1	switch contact	One throw contact of the SPDT switch. The common pins naturally connect to one or the other throw depending on button state.
THROW 2	switch contact	Second throw contact of the SPDT switch. The product page describes the switch as momentary SPDT with two commons and two throws.
LED anode	led power	Positive side of the built-in red indicator LED in the step switch. Drive with current limiting.	Red LED forward voltage about 2.1V to 2.3V, 20mA max per Adafruit product page.
LED cathode	led ground	Negative side of the built-in red indicator LED in the step switch.	Red LED forward voltage about 2.1V to 2.3V, 20mA max per Adafruit product page.

Pinout

Start wiring

Connectors

Displays

Air quality

MCUs and boards