Board Connections

Power input:

Main power supply for the Arduino, OLED display, cooling fan, pump and drop solenoid. +12V DC supply with reverse polarity protection diode. LED power indicator next to connector.

Temp sensor:

3 wire connection to temp sensor using DS18B20 chipset. This sensor is optional but recommended. Either use pin header and jumper wires or screw terminal block.

Current sensor:

3 wire connection to ACS712 +/-20A analog current sensor. This sensor is optional but useful for determining how loaded the 48V supply is. Use pin header and jumper wires to connect between sensor and controller.

OLED display:

4 wire connection to OLED display with I2C interface. Either use pin header and jumper wires or screw terminal block.

Time button:

Wire directly to a momentary push button switch. This switch does not have an LED

Mode button:

Wire directly to a momentary push button switch. This switch has an LED+ output that returns via the – wire of the switch.

Start/stop button:

Wire directly to a momentary push button switch. This switch has an LED+ output that returns via the – wire of the switch.

ZVS relay:

This output drives the solid state relay that applies the 48V to the ZVS induction board. LED indicator next to connector. Maximum current on this output is 50mA.

Cooling fan/pump:

12V output that connects directly to the case cooling fan and the cooling pump for the coil. Max output current of 1A combined with the drop gate solenoid. LED indicator next to connector.

Drop solenoid:

12V output to energise drop gate solenoid. Max output current of 1A combined with the cooling fan and pump. LED indicator next to connector.

Drop servo:

Alternative method for dropping the case instead of a solenoid. Standard RC model servo will plug directly into the PCB pin header.

Revision C Board only features (Red board):

Stepper motor driver breakout header:

This breakout header is used to drive the automatic case feeder stepper motor. It can be operated in 2 ways:

1) direct motor drive using a commonly available A4988 driver used on 3D printers and CNC machines.

2) connecting to the breakout adaptor of a closed loop stepper motor like a Makerbase MKS SERVO42B or BigTreeTech S42B closed loop motor.

Stepper motor connector:

This 4 pin header connects directly to a NMEA17 stepper motor when using a A4988 stepper driver daughterboard.

Stepper motor feedback:

Not currently used.

REV A & B BOARD

REV C BOARD