For this project replace the sound card in the DIY ECG with AD8232 of Scott W. Hardens Sound Card ECG with the ADS1115 16-Bit Analog-to-Digital Converter The Adafruit version of the ADS1115 is also available in Switzerland: And Adafruit has a manual for the ADS1115: https://cdn-learn.adafruit.com/downloads/pdf/adafruit-4-channel-adc-breakouts.pdf Which shows for instance how to connect the ADS1115 …