Extruder and heated bed temperature controller for EMC repstrap
Posted by Petrus
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Extruder and heated bed temperature controller for EMC repstrap October 24, 2011 03:21PM |
I am building an EMC repstrap, all the axis are controlled by a PC but I needed a controler to regulate the temperature of the extruder and heated bed, so here it is :
It is based on a Atmel atmega 324p microcontroller, there is 4 multiplexed thermocouple inputs, 2 for the extruder and 2 for the bed.
The outputs are :
-1 high current PWM output for the bed
-1 medium current output for the extruder
-2 PWM outputs for fans.
The temperatures are set manually using the rotary switch, but I can choose between 2 different settings automatically during print using outputs set in the Gcode, I can also change the temperature manually during print. 10 different settings can be saved in EEPROM.
There is also a logging function to record the temperature using the serial output of the microcontroller.
The two bi-color leds are used to indicate quickly the state of the extruder and bed (yellow = heat up, green = temperature OK, red = error)
The power supply for the electronics and the extruder is built in the box (The box with power supply came from an old external hard drive), for the heated bed, I will need to add an external 12V high current power supply.
The controller can trig an emergency stop if there is a problem.
It is based on a Atmel atmega 324p microcontroller, there is 4 multiplexed thermocouple inputs, 2 for the extruder and 2 for the bed.
The outputs are :
-1 high current PWM output for the bed
-1 medium current output for the extruder
-2 PWM outputs for fans.
The temperatures are set manually using the rotary switch, but I can choose between 2 different settings automatically during print using outputs set in the Gcode, I can also change the temperature manually during print. 10 different settings can be saved in EEPROM.
There is also a logging function to record the temperature using the serial output of the microcontroller.
The two bi-color leds are used to indicate quickly the state of the extruder and bed (yellow = heat up, green = temperature OK, red = error)
The power supply for the electronics and the extruder is built in the box (The box with power supply came from an old external hard drive), for the heated bed, I will need to add an external 12V high current power supply.
The controller can trig an emergency stop if there is a problem.
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Re: Extruder and heated bed temperature controller for EMC repstrap October 25, 2011 11:41AM |
Yep, here is a .zip with schematics, board and the kicad files:
controller.zip
I designed it to work with both an AD597 integrated thermocouple amplifier or an instrumentation amplifier + a 10k NTC for software icepoint compensation.
To use the AD597, you will need an adapter :
AD597_adapter.pdf
controller.zip
I designed it to work with both an AD597 integrated thermocouple amplifier or an instrumentation amplifier + a 10k NTC for software icepoint compensation.
To use the AD597, you will need an adapter :
AD597_adapter.pdf
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