This is PCB and Arduino IDE sketch for Creality Space Pi (Plus or not) automation.

Description:

• necessary the module itself and IDC10 female-male cable
• can be inserted into any Creality SpacePi dryer (double, single, built-in Creality CFS or not)
• other functions and cables are optional (backlights, external control and power are not required for operation, but can be connected additionally)
• the cable from the SpacePi display needs to be disconnected from the dryer board and inserted into the "display" socket on the module
• an additional IDC10 cable connecting between the module "mainboard" socket and the dryer board (power is supplied from the dryer board via this cable)
• RJ45 on the module connecting to any I2C master using a regular patch cord and provides data transfer in both directions, and also serves lighting (24V led strip) inside CFS or dryer
• two pin terminal block on the module used for connecting the led strip; pad J4 on the back of the module (via diode) used for supply 24 volts to the strip directly from CFS (without connecting a patch cord with external power)

Module/sketch features:

• interception of all signals between the display/buttons and the dryer board, the module sees the readings on the display and can control the dryer buttons
• automatic switching on SpacePi after power is supplied
• automatic switching on SpacePi drying mode to the values on the display when the module sees humidity above the set point (by default 30%, switching on for 4 hours, then a break of 4 hours, and so on)
• solving the problem with the E4 error (when the dryer does not reach the expected temperature within 10 minutes) by restarting the drying mode every 9 minutes (until heating to the working temperature)
• transferring data of temperature/humidity in the dryer via I2C as HTU21D sensor protocol
• any information from the dryer display (including an error), as well as pressing any buttons using special I2C commands (see the sketch)