ADS1220 24-bit Precision ADC (ESP32)
Read microvolt-level signals with a precision SPI ADC.
- Track
- SENSE
- Level
- L2
- Prerequisites
- 1
- Status
- Coming soon
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This board is on the bench. Leave your email and you'll be first in when it ships, and your interest helps decide what we build next.
What you'll build
Step up from the noisy internal ADC to a real precision instrument: the 24-bit ADS1220 SPI ADC, able to resolve microvolt-level signals. You'll learn the layout discipline that makes high-resolution measurement actually work — a clean low-noise voltage reference and a carefully separated analog ground. It's the first step toward reading biopotentials like ECG, and eventually EEG.
It sits on the SENSE track: reading real-world signals and turning voltages, currents, and biopotentials into clean digital data.
Tools for this build
Free calculators that do the math this board needs. Each is worked from a real OTD board, with the formula and a cited source.
- Voltage divider calculator (Vout, R1, R2)Compute a resistive divider's output voltage and quiescent current from Vin, R1, and R2. Sized for fitting a higher voltage into an ESP32's 3.3 V ADC.
- RC filter cutoff frequency calculator (first-order)Find a first-order RC filter's −3 dB cutoff (fc = 1 / 2πRC) and time constant from R and C. For ADC anti-alias and noise filtering.
The build pipeline
Part of the path from your first board to a brain-computer interface. See the full skill tree →