Features:

• Dimmer Board for selecting any voltage between 0 VAC - 120 VAC  or  0 VAC - 240 VAC

• Zero-Cross detection
  
• Programmable Atmel ATtiny85 via 6-pin ICSP header
• Compatible with any Arduino!
  
• Can be controlled using voltage [ 0.55V - 2.77V] or by using PWM
• Available for 50Hz or 60Hz  (But can be reprogrammed using ICSP header).
• 120V or 240V
• LED 'AC ON' indicator
• 4-Corner Mounting Holes
• Triac rated for:
  • Peak Non Rep Surge Current Itsm 50Hz:   140A
  • Peak Repetitive Off-State Voltage, Vdrm:   600V
  • On State RMS Current IT(rms): 16A

Controls the amount of dimming based on input voltage on the CTRL pin or a PWM signal on the pin between '+' and '-'

You can select the mode (CTRL voltage signal or PWM signal) by making the pin under '+' LOW or HIGH, respectively.

0 - 0.65V:	100% Dim (Fully OFF)
0.65V - 2.65V:	100% - 0% Dim (Based on 'CTRL' Voltage)
2.65V - 5V:	0% Dim (Fully ON)

Note that for Normally OFF some applications require a resistor (tested with 65K) between CTRL and Ground, while directly powering from an Arduino does not.

• 5V connects to '+' pin on the ICSP header (marked on PCB)
• Ground connects to '-' on the ICSP header (marked on PCB)

Example uses: Control the speed of a fan, drill, motor, etc.  Dim lights.  Control temperature using a heater. Chicken coops, brewing beer, maintaining a set-point using AC, etc.

While high voltage systems are interesting experimentally, they can be dangerous, and if not treated with care, respect and intelligence, they can result in a fatal injury.