This is a dual channel 0-10V dimmer. It can be used to control LED drivers, fans, dampers and more. The PCB is designed to fit into a 4 module wide DIN enclosure.

Features

• ATMega328P-AU
• NRF24L01 PA+LNA SMD module
• ATSHA204A for signing
• AT25DF512C for OTA updates
• Two 0-10V outputs, 40mA max per output
• Two 0-10V inputs (or digital input with external pull-up)
• Two inputs for CT sensors
• External 12V power supply required

Progress

• Schematic
• PCB design
• PCB fabrication
• Assembly
• Test
• Software

Test

Discovered that the silkscreen in rev 1.0 was incorrect. +12V and GND labels were swapped which caused some smoke during initial test. Next problem was a missing connection to the 3.3V regulator which required a blue wire fix. Both these issues have been fixed in rev 1.1.

After the initial problems I have managed to verify:

• ATMega328 and support circuits
• AMS1117 voltage regulator
• NRF24L01 radio
• SHA204A signing chip
• MCP4922 DAC and LM358 Op-Amp for 0-10V output
• LEDs
• AT25DF512 SPI Flash
• 0-10V inputs
• CT sensor inputs