Hey! I've been trying to use the ADS1299 through an ESP32, as shown in the schematic.
The firmware, written in circuitpython, is here: https://pastebin.com/2RCkCnXd. We follow the initialization procedure, but the registers remain zero, and data never becomes available. We've tried other microcontrollers and other firmware, so I assume the problem is in how our ADS1299 is wired. Let me know what other information would help. Thanks!
