A menu incorporates the device’s several operating modes. The data logging shield provides gigabytes of storage, as the signal is recorded to a microSD card adapter.
The digitized ECG signal can be transmitted by serial cable, via Bluetooth to a PC, or to an Android smartphone system for visualization. This required modifying the microchip with the breadboard-friendly Arduino Nano board in addition to a data logger and a Bluetooth breakout board. Starting with the evaluation board of the chip, open-source hardware and software components were integrated into a breadboard prototype. Relevant to mobile health, the design of a portable electrocardiograph (ECG) device using AD823X microchips as the analog front-end is presented.
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