Netduino Breadmachine

This is a page about the Netduino bread machine hack WARNING 240 volt information below is only for qualified people and if you damage anybody or anything it is your own sole responsibility. Epoxy resin on boards is a warning of high voltage components !!!!  ok now for some fun.

1st we will test the motor and heater element if they aren't working then we probably need to abandon project as these can be expensive to replace.  If its just a component failure on the power supply board then we can work around it with some other parts.  You need to test these out of circuit so disconnect the cables attaching them to the main board below. ( click on image below for larger one )


Software installer for breadmaker and Triac AC wave graphic.

Kemo M012 240 volt AC German made Triac for controlling bread crust darkness. Specifications you can control/separate the Triac with the M150 DC pulse module. Note the potentiometer or variable resistor for controlling the voltage phase of the alternating current to the heating element. ( click on image below for larger one )



Motor details ( click on image below for larger one )

Note the white plastic hand rotator for hand starting motor ? for factory people to test motor I guess.......... Its a high Torque 100 watt motor so needs to get started with another winding to help it get though tough doughs send that signal via a 240 volt ac 10 amp relay ( see top picture for Relay location on water cooler circuit I had ). Um to test it make sure you follow all safety procedures and then use the Triac Power Controller above to give it some juice you should hear a quite noticeable hum as the motor tries to start this is OK you have got the right connection for the continuous motor winding.

Equipment list. ( recipe :)

 Broken bread maker
 Source for Single phase dual winding motor, Heater element, and case for mounting them.
 Power Controller M012
 Electronics specialist store ( Jaycar electronics )
 Netduino Microcontroller
 Ebay shop around for a good price
 2 relay 5 volt  PLC board
 Ebay Hong Kong
 Test equipment
 Multimeter and a 240 volt 40 watt incandescent globe for testing 240 volt power connections and Triacs power output.

240 volt test lead kit with multi connectors ( alligator clip , probe points etc )

Terminal Strip of 10 blocks for connecting 240 volt cables and solder for data connections and/or breadboard.

Sensai 240 volt wall plug with 2 USB powered ports. ( useful for connection of the Netduino externally from main power circuits )


Some notes on the relay circuit ( click for larger image ) it basically follows the path from the terminal block to the data inputs from the Netduino/Arduino logic lines. See the note about isolating the power to the circuit using a separate 5 volt supply. ( an old plug pack from a mobile phone would do )


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