Meet the NeuroStimDuino: an open source neurostimulator made with students and researchers in mind. It is an Arduino shield with 2 output channels that can be used to contract flexor and extensor muscles. It has a stackable design and safety features to limit the power density generated to stay within the safety margins.
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The board can generate biphasic, rectangular and constant current stimulation pulses with programmable frequency, pulse-width, and amplitude. You can power it with a 9V battery. The below video gives you an idea what you can do with it:
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