ET-S09
NAU7802 24-bit Load-Cell ADC
24-bit bridge ADC for load cells and scales
AED 19.00
Out of stockOverview
24-bit bridge ADC for load cells and scales
The ET-S09 is built around the Nuvoton NAU7802 — 24-bit ΔΣ, PGA 1–128, internal LDO for bridge excitation, 10–320 SPS. It connects over I²C (fixed 0x2A) and is powered from VIN 2.7–5.5V (DVDD); excitation from the internal LDO 2.4–4.5V.
Two Qwiic / STEMMA QT connectors let you chain it with other boards without soldering, and the 2.54 mm header fits a breadboard.
Designed in Dubai by ElectroTrical — the full schematic, BOM and design notes are published below.
Good for
- Digital kitchen and parcel scales
- Force and thrust measurement
- Strain-gauge experiments
Key features
What makes it different
IC
Nuvoton NAU7802: 24-bit ΔΣ, PGA 1–128, internal LDO for bridge excitation, 10–320 SPS
Interface
I2C, fixed 0x2A
Supply
VIN 2.7–5.5V (DVDD); excitation from the internal LDO 2.4–4.5V
Inputs
Channel 1 = load cell A+/A−; channel 2 pads (B±)
Qwiic / STEMMA QT
Two JST-SH connectors plus a 2.54 mm header — 3.3 V and 5 V hosts.
Open documentation
Schematic, BOM and layout notes published for every board.
Specifications
Technical specifications
| IC | Nuvoton NAU7802: 24-bit ΔΣ, PGA 1–128, internal LDO for bridge excitation, 10–320 SPS |
|---|---|
| Interface | I2C, fixed 0x2A |
| Supply | VIN 2.7–5.5V (DVDD); excitation from the internal LDO 2.4–4.5V |
| Inputs | Channel 1 = load cell A+/A−; channel 2 pads (B±) |
| Size | 25.4 × 17.8 mm |
|---|---|
| Mounting | 4 × M2.5 holes, 2.54 mm from each corner |
| Connectors | 2 × Qwiic / STEMMA QT (JST SH 4-pin) · 0-pin 2.54 mm header |
| Main IC | NAU7802SGI (LCSC C2614351) |
| Revision | Rev B |
| Libraries | SparkFun Qwiic Scale NAU7802, Adafruit_NAU7802 / CircuitPython |
|---|
| JP1 (default Closed) | Cut to turn off the LED |
|---|---|
| JP2 (default Closed) | Cut to remove the I2C pull-ups |
Performance
Speed settings
Pinout
Pin map and connections
| Pin | Name | Type | Function |
|---|
Qwiic / STEMMA QT pins: GND, VIN, SDA, SCL (same on both connectors). I²C pull-ups (10 kΩ) are on the board; cut JP2 to remove them.
Mechanical
Dimensions and what's in the box
In the box
- 1 × ET-S09 NAU7802 24-bit Load-Cell ADC (assembled)
- 1 × 0-pin 2.54 mm male header, unsoldered
Getting started
- Plug in a Qwiic / STEMMA QT cable, or solder the header and wire VIN, GND, SDA and SCL
- Libraries: SparkFun Qwiic Scale NAU7802, Adafruit_NAU7802 / CircuitPython
- Run an I²C scanner to confirm the address: 0x2A
Compare
Which ADC board?
| NAU7802 24-bit Load-Cell ADC (this board)This board | ET-S08 ADS1115 16-bit 4-Channel ADC | ET-S10 FDC1004 Capacitive Soil Moisture Probe | |
|---|---|---|---|
| What it does | 24-bit bridge ADC for load cells and scales | Four 16-bit analog inputs with programmable gain | Corrosion-proof capacitive soil probe with I²C |
| Interface | I²C, fixed 0x2A | I²C 0x48 default / 0x49 / 0x4A / 0x4B (JP3) | I²C fixed 0x50 |
| Best for | Digital kitchen and parcel scales | Reading analog sensors precisely | Plant and garden monitoring |
| Price | 19 AED | 49 AED | 23 AED |
Downloads
Documents and design files
Need a custom version of this board?
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