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Connection

Wiring Diagram

The iHeater controller can operate both as part of a Klipper system (as an additional MCU) or autonomously using the integrated standalone firmware.

Connecting for use with Klipper

For proper operation within Klipper, connect the following:

  • USB cable to the main host (Host-MCU) — provides data communication and 5V power supply.
  • Power supply 220V / 110V — depending on device version and heater type.
  • Heater thermistor — to monitor heater temperature.
  • Chamber thermistor — to monitor air temperature inside the printer chamber.
  • Trigger port — optional, used for automatic control from an external signal.

During operation, the iHeater is located inside the 3D printer chamber.

It is recommended to place the chamber thermistor at the level of the toolhead, preferably above the heated bed.

Wiring Diagram

GPIO Configuration

Pin Alias Function
PA0 TH1 Chamber temperature sensor
PA1 HEATER Heater control
PA2 FAN Fan control
PA3 TH0 Heater temperature sensor
PA4 MODE Mode button
PA5 LED3 LED 3
PA6 LED2 LED 2
PA7 LED1 LED 1
PB1 TH2 Optional temperature sensor

Standalone mode usage

In standalone mode, additional functions and connection methods are available:

  • Trigger port in thermistor mode By connecting a thermistor to the trigger port and placing it near the heated bed element, automatic control can be enabled:

  • Heater turns on when the bed heats above 45°C.

  • Heater turns off when the temperature drops below 85°C.

  • Power from an external 5V source If USB power is unavailable, you can directly supply power through the corresponding connector.

  • Experimental option Connect 5V power supply directly to the board.

Power Connection

General Wiring Diagram

Wiring Diagram