Adafruit
Adafruit 555 PWM Output STEMMA - 1.5K~25 KHz or 1.5~250 Hz
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The Adafruit 555 PWM Output STEMMA is a fully assembled 555 timer board that generates an adjustable square-wave PWM signal — no breadboard wiring or externa...
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The Adafruit 555 PWM Output STEMMA is a fully assembled 555 timer board that generates an adjustable square-wave PWM signal — no breadboard wiring or external components needed. An onboard trimmer pot lets you tune the frequency across two selectable ranges: approximately 1.5 KHz to 25 KHz, or 1.5 Hz to 250 Hz.
The output is buffered by a 74HC1G04 inverter, capable of sourcing or sinking up to 12.5 mA — enough to drive piezos, modulate IR signals, generate audio tones, or fake a PC fan tachometer signal. Power the board from 3–12V DC; an onboard regulator caps the 555 and buffer at 5V, so the output stays at logic level regardless of input voltage.
Key Features
- Two Frequency Ranges – Selectable ~1.5 KHz–25 KHz or ~1.5 Hz–250 Hz
- Adjustable Output – Onboard trimmer pot for precise frequency tuning
- Buffered Output – 74HC1G04 inverter can source/sink up to 12.5 mA
- Wide Input Voltage – 3–12V DC with onboard 5V regulator
- STEMMA JST PH Connector – 3-pin 2 mm pitch for power, ground, and signal
- Optional Header – 0.1" spaced header pads if you prefer soldering
- No Microcontroller Needed – Standalone analogue signal generation
Ideal For
- PC fan tachometer signal emulation
- Driving piezos and buzzers
- Audio signal generation and testing
- IR signal modulation
- General-purpose square-wave generation
Package Contents
- 1× Adafruit 555 PWM Output STEMMA (assembled and tested)
Jargon buster
Plain-language definitions for the technical terms used above.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- JST PH
- A small keyed plug-and-socket connector with 2 mm pin spacing, often used for low-power electronics connections. You need the correct JST PH cable, and its current rating limits how much power should be passed through it.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
- pH
- A measure of how acidic or alkaline a liquid is, on a scale from 0 to 14 where 7 is neutral, lower is acidic and higher is alkaline. When a probe or sensor quotes a pH range and accuracy, check they cover the readings your project needs.
- PWM
- Pulse Width Modulation is a way for a digital pin to simulate variable output power by switching on and off very quickly. It matters for controlling things like LED brightness, motor speed, or servo-style signals from a microcontroller pin.
- STEMMA
- A plug-and-cable connection system used on some maker electronics boards to make wiring simpler. If a product uses STEMMA, you need the matching cable or connector type to plug it in without soldering.
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