LOG 005 / ANALOG FRONT END / ACTIVE
ADS1115 16-bit ADC
The ADS1115 is a 16-bit delta-sigma analog-to-digital converter. For MycoTune, it can digitize a properly protected, biased, and conditioned bioelectric signal before an ESP32-S2 visualizes or sonifies it.
16 BIT
Four single-ended or two differential inputsProgrammable gain amplifierUp to 860 samples per secondI²C interface with comparator
RESEARCH SIGNAL FLOW
electrodes → protection / bias → ADS1115 → ESP32-S2 → display + soundMYCOTUNE USE CASES
◌ Differentially sample electrode pairs after signal conditioning
◌ Switch between multiple plant or mycelium channels
◌ Use programmable gain for small, slow changes
◌ Send calibrated samples to the ESP32-S2 for the Honest Squiggle
NEXT BENCH STEPS
→ Choose a safe analog front end and bias point
→ Add input protection and verify absolute input limits
→ Characterize mains hum, electrode drift, and baseline noise
→ Compare sample rates and PGA ranges with real electrodes