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Figure 2 | Journal of NeuroEngineering and Rehabilitation

Figure 2

From: Brain-Computer Interface Controlled Functional Electrical Stimulation System for Ankle Movement

Figure 2

BCI-FES control module. (A) The block diagram shows a microcontroller unit (MCU) interfaced with a digital potentiometer (digipot) and a relay. The digipot modulates the amplitude of the stimulating current, while the relay keeps the circuit between the surface FES electrodes and the stimulator normally open. The relay circuit closes when it receives a logical high from the MCU (coinciding with the detection of dorsifiexion state by the BCI computer). For safety reasons, a manually operated emergency power-off (EPO) switch is added to the stimulator power supply circuit. (B) The circuit diagram of the BCI-FES control module showing detailed wiring scheme. The digipot's resistance changes from 0 kΩ to 50 kΩ, thereby changing the amplitude of the stimulating current from 0 mA to 100 mA. Not shown in (A) is a field-effect transistor (BS170), used to ensure proper power-on sequence for the digipot.

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