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→Electronics
==Electronics==
==Electronics==
The MPR121 capacitive touch sensor can be connected to up to 12 capacitive electrodes (e.g., 12 sipper tubes). Its GND, 3.3V, SCL and SDA pins are connected to the corresponding Teensy-LC pins. The 5V and GND Teensy-LC pins provide the logic power supply to the DRV8825 motor driver, which is connected to a 12V DC power supply with a 100 uF decoupling capacitor to power to the stepper motor. The direction (DIR), step (STP) and enable (ENA) pins of the motor driver receive signals from the Teensy-LC digital pins D0, D1 and D2 respectively. Because the reset (RES) and sleep (SLP) motor driver pins are active low pins, they are connected to the logic power supply to ensure they remain inactive. [https://drive.google.com/drive/folders/1_GCll42MNhbK981q99WKfd3auBnq7ENU Fritzing schematic of electronic esophagus circuit.]
==Hardware and 3D Printed Parts==
==Hardware and 3D Printed Parts==