How hot does this board get controlling 8 light circuits when all are on at and running toward their max load?

They are okey. They are not getting too hot.. They have built in heatsink already. Please let me know if you have any question.

Can this be pwm driven or is the code much more complicated?

The code is more complicated. You have to use the zero cross functionality as an interrupt and then trigger the triacs based upon your countries AC sign wave frequency and how much dimming you want.

The wiring diagrams shows the "sync" pin connecting to an arduino i/o pin 3. what does this do?

SYNC pin - this is zero cross detector. It connected to the arduino external interrupt, which detect zero cross.

I looked at the sample code for using this with an arduino. where does the timerone.h code come from? i.e #include

You can down load this and other library files from the internet

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8 Channel Digital Ac Programmable Light Dimmer Module Controller Board Arduino Raspberry Compatible 50/60hz 110V, 220V IOT

8 Channel Digital Ac Programmable Light Dimmer Module Controller Board Arduino Raspberry Compatible 50/60hz 110V, 220V IOT

Product ID: 33273640

Details

Brand
KRIDA
CPU Manufacturer
ARM
Compatible Devices
Arduino Pi
Included Components
8 Triacs with
Operating System
Linux

⚡Supports 110V/220V & auto 50/60Hz detection

🔌8 channels for multi-device control

🤖Arduino & Raspberry Pi compatible

Description

💡 Dim Smarter, Live Brighter — Control Your World with Precision!

COMPACT MOUNTABLE - Sleek 5.16" x 3.58" PCB with four mounting holes for easy, tidy setup anywhere.
SAFE ISOLATED DESIGN - Low and high voltage sides are completely isolated, ensuring safer DIY installations.
SMART HOME INTEGRATION READY - Fully compatible with Arduino and Raspberry Pi for custom IoT automation projects.
MASTER YOUR LIGHTING AMBIANCE - 8 independent dimmer channels let you craft the perfect mood for every room or event.
PLUG PLAY POWER FLEXIBILITY - Seamlessly handles 110V or 220V AC with automatic frequency detection for global compatibility.

The 8 Channel Digital AC Programmable Light Dimmer Module by KRIDA is a versatile, Arduino and Raspberry Pi compatible controller designed for precise AC light dimming. Supporting 110V/220V input with auto 50/60Hz detection, it features 8 triac channels with zero-cross detection for smooth dimming of incandescent lamps, AC LED bulbs, and fans. Its isolated design ensures safety, while compact dimensions and mounting options make it ideal for home automation, IoT projects, and creative lighting setups.

Specifications

ASIN	B01BMSRVVE
Best Sellers Rank	#1,096,069 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,716 in Dimmer Switches
Brand	KRIDA
Built-In Media	8 Triacs with zero-cross detector, Four mounting holes
Compatible Devices	Arduino, Raspberry Pi
Customer Reviews	4.6 out of 5 stars 14 Reviews
Included Components	8 Triacs with zero-cross detector, Four mounting holes
Item Dimensions L x W x H	5.16"L x 3.58"W x 3.58"H
Item Weight	4.8 ounces
Manufacturer	Krda
Mfr Part Number	8ChAcDimmerK
Model Number	8ChAcDimmer
Number of Items	1
Number of Packs	1
Operating System	Linux
Processor Count	1
RAM Memory Technology	LPDDR
Total Usb Ports	1
UPC	636134999646
Unit Count	1 Count
Wireless Communication Standard	802.11n
Wireless Compability	802.11n

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