I'd like to use this as a soft-start controller for some outdoor incandescent lights. Can I configure it to do that without a cpu board attached?

You can use this item with potentiometer and adjust the brightness of dimmable lights https://www.amazon.com/dp/B06Y1DT1WP?ref=myi_title_dp

What PWM frequency sould one use to control this dimmer? Should it match the A/C frequency?

I tried those and you can’t really control a triac with PWM. When a triac turns on it will stay on until the current invert means when the sinusoid passes the Ov axis. You need to delay the triac command from the Zero information. More you delay it more you dim. The delay is from Oms full on to 8.333ms for off. If you control a light between about 6ms to 8ms it’s going to flake. The Zero information needs to trigger an interruption and in the interruption function you delay the command. I use delayMicroseconds().

What is the maximum wattage I can put through this?

They support up to 2A. So 110V*2A= 220watt

Where is some simple code for one unit connected to one arduino uno? if i have to reverse engineer what's on github it gets one star.

Hi We love to help our customers. Did you check this link for sample code? please see below link. If it does not help you can you please give me more information why it does not help you. Thank you https://github.com/RobotDynOfficial/RBDDimmer

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3 pcs Genuine PWM Ac Programmable Light Dimmer 110V - 220V AC Module Controller Compatible 50/60hz 3.3V/5V Logic Compatible with Arduino, STM, ARM, Raspberry

3 pcs Genuine PWM Ac Programmable Light Dimmer 110V - 220V AC Module Controller Compatible 50/60hz 3.3V/5V Logic Compatible with Arduino, STM, ARM, Raspberry

Product ID: 208400096

Details

Brand
IOT DynRobot
CPU Model
None
Cache Size
2 MB
Color
White
Graphics Card Description
This is the of
Included Components
Dimmer

⚡240V/8A max power control

🔄50/60Hz AC phase control

🧠3.3V/5V logic compatible

AED 149

Duties & taxes included

In stock

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Description

💡 Dim your world, amplify your smart home vibe!

TRIPLE PACK ADVANTAGE - Get 3 modules in one set—perfect for multi-room or multi-device setups.
SEAMLESS AC POWER MASTERY - Control up to 240V/8A for lamps, motors & pumps with precision.
SMART ZERO CROSS DETECTION - Zero crossing derived from rectified mains ensures smooth dimming & minimal noise.
PLUG PLAY HOME AUTOMATION - Easily integrate into smart home projects for mood lighting and device control.
UNIVERSAL LOGIC COMPATIBILITY - Works flawlessly with 3.3V & 5V microcontrollers like Arduino, Raspberry Pi, STM, ARM.

This 3-piece AC PWM dimmer set offers robust 240V/8A power control with zero-cross phase detection, compatible with 3.3V and 5V logic microcontrollers including Arduino and Raspberry Pi. Ideal for smart home automation, it enables smooth dimming of filament lamps, motors, pumps, and more, making it a must-have for professional projects and DIY enthusiasts aiming to elevate their connected living experience.

Specifications

ASIN	B0893K6ZPK
Additional Features	Motion sensor
Aspect Ratio	16:9
Best Sellers Rank	#3,873 in Single Board Computers (Computers & Accessories)
Brand	IOT DynRobot
Built-In Media	Dimmer
CPU Model	None
CPU Model Number	ATMEGA32A
Cache Memory Installed Size	2 MB
Cache Size	2 MB
Color	White
Compatible Devices	Heater, Lamp, Motor, Pump
Connectivity Technology	USB
Customer Reviews	4.3 out of 5 stars 14 Reviews
Display Resolution Maximum	1920 pixels
Graphics Card Description	This is the description of the pc graphics
Graphics Card Interface	Integrated
Graphics Description	This is the description of the pc graphics
Hard Disk Description	SSD
Hard Disk Interface	Solid State
Hardware Interface	USB
Human-Interface Input	Keyboard
Item Dimensions	2.48 x 1.18 x 1.18 inches
Keyboard Description	Membrane, QWERTY
Keyboard Layout	QWERTY
Manufacturer	ElectronicNuts
Model Name	1ChDimmerHeat2pcs
Model Number	1ChDimmerHeat2pcs
Number of Component Outputs	1
Operating System	Triac
Personal Computer Design Type	Barebone
Processor Brand	Ark Componenet
Processor Series	None
Processor Socket	Socket 7
RAM Type	DIMM
Specific Uses For Product	Home Automation, School Projects, Work Projects
Style Name	Minimalist
Total Usb Ports	1
Unit Count	3 Count
Video Output	VGA, HDMI
Video Output Interface	VGA, HDMI
Video Processor	arm

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