ET-S10
FDC1004 Capacitive Soil Moisture Probe
Corrosion-proof capacitive soil probe with I²C
AED 23.00
Out of stockOverview
Corrosion-proof capacitive soil probe with I²C
The ET-S10 is built around the TI FDC1004 — 4-channel 16-bit capacitance-to-digital converter, ±15pF range + 96pF CAPDAC offset, active shield drivers. It connects over I²C fixed 0x50 and is powered from VIN 3.3–5.5V, onboard LDO (IC needs 3.0–3.6V).
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
- Plant and garden monitoring
- Automatic irrigation
- Greenhouse sensing
Key features
What makes it different
IC
TI FDC1004: 4-channel 16-bit capacitance-to-digital converter, ±15pF range + 96pF CAPDAC offset, active shield drivers
Interface
I2C fixed 0x50
Supply
VIN 3.3–5.5V, onboard LDO (IC needs 3.0–3.6V)
Probe
Electrodes sealed under soldermask, no exposed copper anywhere (including board edges)
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 | TI FDC1004: 4-channel 16-bit capacitance-to-digital converter, ±15pF range + 96pF CAPDAC offset, active shield drivers |
|---|---|
| Interface | I2C fixed 0x50 |
| Supply | VIN 3.3–5.5V, onboard LDO (IC needs 3.0–3.6V) |
| Probe | Electrodes sealed under soldermask, no exposed copper anywhere (including board edges) |
| Size | 110.0 × 25.0 mm |
|---|---|
| Mounting | 4 × M2.5 holes, 2.54 mm from each corner |
| Connectors | 2 × Qwiic / STEMMA QT (JST SH 4-pin) · 5-pin 2.54 mm header |
| Main IC | FDC1004DGSR (LCSC C2865994) |
| Revision | Rev B |
| Libraries | Arduino FDC1004 libraries (Protocentral), CircuitPython via register access. We publish our own example + ESPHome YAML |
|---|
| JP1 (default Closed) | Cut to turn off the LED (saves power on battery nodes) |
|---|---|
| JP2 (default Closed) | Cut to remove the host-side pull-ups |
Performance
Speed settings
Pinout
Pin map and connections
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VIN | Power | Power in (3.3–5 V) |
| 2 | 3V3 | Power | 3.3 V regulator output |
| 3 | GND | Ground | Ground |
| 4 | SCL | I²C | I²C clock |
| 5 | SDA | I²C | I²C data |
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-S10 FDC1004 Capacitive Soil Moisture Probe (assembled)
- 1 × 5-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: Arduino FDC1004 libraries (Protocentral), CircuitPython via register access. We publish our own example + ESPHome YAML
- Run an I²C scanner to confirm the address: 0x50
Compare
Which ADC board?
| FDC1004 Capacitive Soil Moisture Probe (this board)This board | ET-S08 ADS1115 16-bit 4-Channel ADC | ET-S09 NAU7802 24-bit Load-Cell ADC | |
|---|---|---|---|
| What it does | Corrosion-proof capacitive soil probe with I²C | Four 16-bit analog inputs with programmable gain | 24-bit bridge ADC for load cells and scales |
| Interface | I²C fixed 0x50 | I²C 0x48 default / 0x49 / 0x4A / 0x4B (JP3) | I²C, fixed 0x2A |
| Best for | Plant and garden monitoring | Reading analog sensors precisely | Digital kitchen and parcel scales |
| Price | 23 AED | 49 AED | 19 AED |
Downloads
Documents and design files
Need a custom version of this board?
Different connector, size or sensor? We design and build custom variants.