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AD8232 ECG Front End

ET-S50

AD8232 ECG Front End

Single-lead ECG and heart-rate front end (not medical)

AED 79.00

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Download datasheet (PDF)

OverviewKey featuresSpecificationsPerformancePinout

Overview

Single-lead ECG and heart-rate front end (not medical)

The ET-S50 is built around the ADI AD8232: instrumentation amp + 2-pole HPF + uncommitted op-amp + right-leg drive + lead-off detection. It runs from VIN 3.3–5.5V → 3.3V LDO.

Designed in Dubai by ElectroTrical — the full schematic, BOM and design notes are published below.

Good for

  • ECG learning and STEM labs
  • Heart-rate experiments
  • Biosignal research prototypes

Key features

What makes it different

IC

ADI AD8232: instrumentation amp + 2-pole HPF + uncommitted op-amp + right-leg drive + lead-off detection

Configuration

Heart-rate / single-lead ECG: ~0.5–40Hz band, gain ≈ 1100 (verify with datasheet reference design)

Output

Analog 0–3.3V for any ADC (ESP32/Arduino/ADS1115 S08)

Supply

VIN 3.3–5.5V → 3.3V LDO

Open documentation

Schematic, BOM and layout notes published for every board.

Breadboard friendly

Standard 2.54 mm pitch and M2.5 mounting holes.

Specifications

Technical specifications

Device
ICADI AD8232: instrumentation amp + 2-pole HPF + uncommitted op-amp + right-leg drive + lead-off detection
ConfigurationHeart-rate / single-lead ECG: ~0.5–40Hz band, gain ≈ 1100 (verify with datasheet reference design)
OutputAnalog 0–3.3V for any ADC (ESP32/Arduino/ADS1115 S08)
SupplyVIN 3.3–5.5V → 3.3V LDO
Board
Size38.1 × 25.4 mm
Mounting4 × M2.5 holes, 2.54 mm from each corner
Connectors7-pin 2.54 mm header
Main ICAD8232ACPZ-R7 (LCSC C43216)
RevisionRev B
Software
LibrariesSparkFun AD8232 examples (Arduino/Processing), any analog read + filter
Solder jumpers
JP1 (default Closed)Cut to turn off the LED

Performance

Signal bandwidth

Upper frequency limitThis board filters to about 0.5–40 Hz for clean heart-rate traces. Diagnostic ECG needs a wider band, which is one reason it is not a medical device.

Pinout

Pin map and connections

AD8232 ECG Front End pinout: VIN, GND, OUTPUT, LO+, LO-, SDN, REF
PinNameTypeFunction
1VINPower3.3–5.5V
2GNDGroundGround
3OUTPUTOutputAnalog ECG, centred at REF (~1.65V)
4LO+OutputLead-off +
5LO-OutputLead-off −
6SDNSignalLow = shutdown
7REFSignalMid-supply reference

Mechanical

Dimensions and what's in the box

Board 38.1 × 25.4 mm with M2.5 holes
Top view · 38.1 × 25.4 mm

In the box

  • 1 × ET-S50 AD8232 ECG Front End (assembled)
  • 1 × 7-pin 2.54 mm male header, unsoldered

Getting started

  • Wire the header: VIN, GND, OUTPUT, LO+, LO-, SDN
  • Libraries: SparkFun AD8232 examples (Arduino/Processing), any analog read + filter

Compare

Which health sensor?

AD8232 ECG Front End (this board)This boardET-S49 MAX30102 Pulse-Ox & Heart-Rate Sensor
What it doesSingle-lead ECG and heart-rate front end (not medical)SpO₂ and heart-rate optical sensor (not medical)
Interface—I²C 0x57 (open-drain pins tolerate 3.3V pull-ups)
Best forECG learning and STEM labsHeart-rate wearables
Price79 AED59 AED

Downloads

Documents and design files

PDFET-S50 schematicRev BLCSCAD8232ACPZ-R7 datasheet and stockC43216
STEP3D modelComing soon

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