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Step 2Adjusting the popcorn machine
The popcorn machine itself is adjusted by placing a temperature sensor, disconnecting the heating coil and fan motor contacts and installing wires and a solid state relais. Be sure to read my previous instructable as well, since that was my starting point.
Temperature sensor:
The sensor is installed on the inside of the aluminium cup, just above the sleeves, as it needs to measure the temperature of the beans while roasting. I used a piece of silicon (from a silicon hose) to make a heat resistant housing to keep the sensor in place and prevent short circuit. Drill a hole in the cup and place the sensor as shown on the photo's. Take care the sensor leads don't touch the metal of the cup. Outside the cup, the sensor is connected to wires long enough the lead out of the popcorn machine. The sensor and wires are secured with a tierap. Take care that the wires don't touch the cup either, as they can melt.
Installing a solid state relais to the heating coil:
The heating coil needs to be disconnected from the motor and from the heat security build into the popcorn machine. The electricity cord of the machine (220V) should be directly connected to the heating coil and the switch. In this circuit you build the solid state relais. Wires to control the solid state relais run out of the popcorn machine to the Arduino.
Fan motor:
The contacts of the fan motor are disconnected from the rest of the electronics and connected to two wires running out of the popcorn machine. A diode is placed between the two contacts to stop electricity being produced by the motor, after it is switched off but still turning. As power supply, a plug is installed to attach the 19v adapter of my laptop.
Temperature sensor:
The sensor is installed on the inside of the aluminium cup, just above the sleeves, as it needs to measure the temperature of the beans while roasting. I used a piece of silicon (from a silicon hose) to make a heat resistant housing to keep the sensor in place and prevent short circuit. Drill a hole in the cup and place the sensor as shown on the photo's. Take care the sensor leads don't touch the metal of the cup. Outside the cup, the sensor is connected to wires long enough the lead out of the popcorn machine. The sensor and wires are secured with a tierap. Take care that the wires don't touch the cup either, as they can melt.
Installing a solid state relais to the heating coil:
The heating coil needs to be disconnected from the motor and from the heat security build into the popcorn machine. The electricity cord of the machine (220V) should be directly connected to the heating coil and the switch. In this circuit you build the solid state relais. Wires to control the solid state relais run out of the popcorn machine to the Arduino.
Fan motor:
The contacts of the fan motor are disconnected from the rest of the electronics and connected to two wires running out of the popcorn machine. A diode is placed between the two contacts to stop electricity being produced by the motor, after it is switched off but still turning. As power supply, a plug is installed to attach the 19v adapter of my laptop.
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