Quantity   Component name
1 × Wemos D1R1 We want to reduce the size of the electronical part of the previous device. To do that, we use a Wemos D1R1. It’s an arduino-like with a wifi module ESP8266 incorporated. With that, we can remove the huzzah feather and the bread board.
1 × Heart Monitor AD8232 The AD8232 is an integrated signal conditioning block for ECG and other biopotential measurement applications. It is designed to extract, amplify, and filter small biopotential signals in the presence of noisy conditions, such as those created by motion or remote electrode placement. This design allows for an ultralow power analog-to-digital converter (ADC) or an embedded microcontroller to acquire the output signal easily.