ET-S54
TMP102 Temperature Sensor
Tiny low-power ±0.5 °C temperature sensor, Qwiic
AED 17.00
Out of stockOverview
Tiny low-power ±0.5 °C temperature sensor, Qwiic
The ET-S54 is built around the TI TMP102 — ±0.5°C (−25…85°C), 0.0625°C resolution, 10µA active / 1µA shutdown. It talks over I²C 0x48 / 0x49, alert output and runs from VIN 3.3–5.5V, onboard LDO + level shifting.
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
- Battery-powered nodes
- Enclosure temperature
- Simple weather stations
Key features
What makes it different
Sensor
TI TMP102: ±0.5°C (−25…85°C), 0.0625°C resolution, 10µA active / 1µA shutdown
Interface
I²C 0x48 / 0x49, alert output
Supply
VIN 3.3–5.5V, onboard LDO + level shifting
Libraries
SparkFun TMP102, CircuitPython adafruit_tmp117-style tmp102 drivers, ESPHome tmp102
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 TMP102: ±0.5°C (−25…85°C), 0.0625°C resolution, 10µA active / 1µA shutdown |
|---|---|
| Interface | I²C 0x48 / 0x49, alert output |
| Supply | VIN 3.3–5.5V, onboard LDO + level shifting |
| 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) · 6-pin 2.54 mm header |
| Main IC | TMP102AIDRLR (LCSC C99269) |
| Revision | Rev A |
| Libraries | SparkFun TMP102, CircuitPython adafruit_tmp117-style tmp102 drivers, ESPHome tmp102 |
|---|
| JP1 (default Closed) | Cut to turn off the LED |
|---|---|
| JP2 (default Closed) | Cut to remove the host-side I2C pull-ups |
| JP3 (default Open) | Bridge ADD0 to 3V3 → 0x49 |
Performance
Power
Pinout
Pin map and connections
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VIN | Power | 3.3–5.5V |
| 2 | 3V3 | Power | LDO output |
| 3 | GND | Ground | Ground |
| 4 | SCL | I²C | I²C clock |
| 5 | SDA | I²C | I²C data |
| 6 | ALERT | Output | Open-drain, 3.3V level |
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-S54 TMP102 Temperature Sensor (assembled)
- 1 × 6-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 TMP102, CircuitPython adafruit_tmp117-style tmp102 drivers, ESPHome
tmp102 - Run an I²C scanner to confirm the address: 0x48, 0x49
Compare
Which temperature sensor?
| TMP102 Temperature Sensor (this board)This board | ET-S53 MCP9808 Precision Temperature | ET-S55 HDC1080 Temperature & Humidity | ET-S16 TMP117 ±0.1 °C Temperature Sensor | |
|---|---|---|---|---|
| What it does | Tiny low-power ±0.5 °C temperature sensor, Qwiic | ±0.25 °C typical digital temperature, Qwiic | Low-cost ±0.2 °C / ±2 %RH sensor, Qwiic | Medical-grade accuracy digital temperature sensor |
| Interface | I²C 0x48 / 0x49, alert output | I²C 0x18 (8 addresses), programmable alert output | I²C fixed 0x40 | I²C 0x48–0x4B |
| Best for | Battery-powered nodes | Room and incubator monitoring | Room climate monitors | Precision temperature logging |
| Price | 17 AED | 15 AED | 12 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.