ET-S55
HDC1080 Temperature & Humidity
Low-cost ±0.2 °C / ±2 %RH sensor, Qwiic
AED 12.00
Out of stockOverview
Low-cost ±0.2 °C / ±2 %RH sensor, Qwiic
The ET-S55 is built around the TI HDC1080 — ±0.2°C, ±2%RH, 14-bit, integrated heater, 1.3µA average. It talks over I²C fixed 0x40 and runs from 2.7–5.5V direct.
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
- Room climate monitors
- Greenhouses
- HVAC projects
Key features
What makes it different
Sensor
TI HDC1080: ±0.2°C, ±2%RH, 14-bit, integrated heater, 1.3µA average
Interface
I²C fixed 0x40
Supply
2.7–5.5V direct
Libraries
ClosedCube HDC1080, CircuitPython hdc1080 community driver, ESPHome hdc1080
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
| Sensor | TI HDC1080: ±0.2°C, ±2%RH, 14-bit, integrated heater, 1.3µA average |
|---|---|
| Interface | I²C fixed 0x40 |
| Supply | 2.7–5.5V direct |
| 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) · 4-pin 2.54 mm header |
| Main IC | HDC1080DMBR (LCSC C82227) |
| Revision | Rev A |
| Libraries | ClosedCube HDC1080, CircuitPython hdc1080 community driver, ESPHome hdc1080 |
|---|
| JP1 (default Closed) | Cut to turn off the LED |
|---|---|
| JP2 (default Closed) | Cut to remove the host-side I2C pull-ups |
Performance
Speed
Pinout
Pin map and connections
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VIN | Power | Sensor supply = host logic level |
| 2 | GND | Ground | Ground |
| 3 | SCL | I²C | I²C clock |
| 4 | 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-S55 HDC1080 Temperature & Humidity (assembled)
- 1 × 4-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: ClosedCube HDC1080, CircuitPython hdc1080 community driver, ESPHome
hdc1080 - Run an I²C scanner to confirm the address: 0x40
Compare
Which temperature sensor?
| HDC1080 Temperature & Humidity (this board)This board | ET-S53 MCP9808 Precision Temperature | ET-S54 TMP102 Temperature Sensor | ET-S16 TMP117 ±0.1 °C Temperature Sensor | |
|---|---|---|---|---|
| What it does | Low-cost ±0.2 °C / ±2 %RH sensor, Qwiic | ±0.25 °C typical digital temperature, Qwiic | Tiny low-power ±0.5 °C temperature sensor, Qwiic | Medical-grade accuracy digital temperature sensor |
| Interface | I²C fixed 0x40 | I²C 0x18 (8 addresses), programmable alert output | I²C 0x48 / 0x49, alert output | I²C 0x48–0x4B |
| Best for | Room climate monitors | Room and incubator monitoring | Battery-powered nodes | Precision temperature logging |
| Price | 12 AED | 15 AED | 17 AED | 39 AED |
Downloads
Documents and design files
Need a custom version of this board?
Different connector, size or sensor? We design and build custom variants.