RickSA

Hi Everyone I wonder if anyone here could help me? I have started making a hood for my S3 to better control build volume temperature for more accurate and stronger ABS prints. My plan is currently to use a small MCU and fan to control the chamber temperature but it will need manual setting and turning on and off with the start and stop of prints. I intend to use the 24V supply from the UMB port to power it but would like to be able to use the communication through the UMB port like the "Air Manager" for the S5 to give control/setting through Cura. Has anyone attempted this or could someone assist with pinouts and data protocol? Is it UART, SPI, I2C or something else? Are there any other projects that anyone is aware of that could help me as I seem to have come to a dead end with online searches. Thanks in advance for any help! Rick