Posts Tagged ‘UK supplier’

Modular Music Box – Hall Effect Sensors

I wanted to test the hall effect sensors I’d bought to see if they could be used for my idea of a rotary magnetic sequencer for the Modular Music Box.

There’s a link to the data sheet and a handy Hall_ Applications_Guide.PDF as well as some useful advice on the Sparkfun Hall Effect Sensor page and in the comments… and the Arduino:Playground provided a bit of code to test the sensor in action…

“You’ve got 3 pins from the front (the triangle edge). Left to right, power, ground, output.
Stick a 10k pull up between 5v and output. Then it’ll latch on/off depending on the poll you use.”

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Modular Music Box – Stepper Motors

While worth buying to test the Adafruit Motor/Stepper/Servo shield and get some hands-on experiments done I suspected the Solarbotics GM17 might not be the best motor for the job(s) in the Modular Music Box – requiring +9V, having little torque at low speed and being quite noisy – though it is quite compact and did just manage to fit centrally in the monome size casing alongside an Arduino Duemilanove clone…

Further research suggested that a stepper motor would be the best choice to drive the sequencer and animation turntables. In the interim I tested a stepper motor from Fab Lab Manchester – the six wire PF35T-48L4 – a 7V (though it will supposedly run as low as 5V) 20ohms UNIPOLAR, S/A 3.6deg stepper motor. The makingthings.com Stepper Motor How-tos helped me identify the yellow and orange as one pair, the black and brown as the other and the red and green wires as the center taps.

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