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[[File:hacked_toy_matrix_ohm.jpg]]<br><br> | [[File:hacked_toy_matrix_ohm.jpg]]<br><br> | ||
[[File:hacked_toy_matrix.jpg]]<br><br> | [[File:hacked_toy_matrix.jpg]]<br><br> | ||
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[[File:matrix_sketch_1.jpg]]<br><br> | [[File:matrix_sketch_1.jpg]]<br><br> | ||
[[File:matrix_ardu_1.jpg]]<br><br> | [[File:matrix_ardu_1.jpg]]<br><br> | ||
'''5) using different matrix systems as a) a resistive sensor and b) a switch based in- and output structure''' | |||
The idea of using a matrix as a variable resistor was a good way of connecting the toy-keyboard to the arduinos analog input.<br> | |||
My hacked version of the toy keyboard does not really work as a system of clear state switches as I rather used a resistive than a conductive material in order to access the matrix (graphite lines). <br> | |||
The multimeter shows that - if I combine all the vertically and all the horizontally connected „lines“ together - I get a certain value of resistance for each button.<br><br> | |||
[[File:resistor_values_toy_matrix.jpg]]<br><br> | |||
This way it is possible to use the matrix for instance as a variable resistor for an astable 555 timer chip between pin 6 and pin 7:<br><br> | |||
[[File:555_toy_matrix.jpg]]<br><br> | |||
VIDEO<br><br> | |||