ET-S61
AHT20 Temperature + Humidity Sensor
Budget ±0.3 °C / ±2 %RH sensor, 2.2–5.5 V, Qwiic
AED 14.00
Out of stockOverview
Budget ±0.3 °C / ±2 %RH sensor, 2.2–5.5 V, Qwiic
The ET-S61 is built around the Aosong AHT20 — ±0.3°C, ±2%RH, factory calibrated. It talks over I2C fixed 0x38 and runs from 2.2–5.5V direct from Qwiic (no LDO needed).
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 and greenhouse monitors
- Classroom kits
- ESPHome climate sensors
Key features
What makes it different
Sensor
Aosong AHT20: ±0.3°C, ±2%RH, factory calibrated
Interface
I2C fixed 0x38
Supply
2.2–5.5V direct from Qwiic (no LDO needed)
Libraries
Adafruit_AHTX0 / CircuitPython, ESPHome aht10 (variant AHT20)
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 | Aosong AHT20: ±0.3°C, ±2%RH, factory calibrated |
|---|---|
| Interface | I2C fixed 0x38 |
| Supply | 2.2–5.5V direct from Qwiic (no LDO needed) |
| 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 | AHT20 (LCSC C2757850) |
| Revision | Rev A |
| Libraries | Adafruit_AHTX0 / CircuitPython, ESPHome aht10 (variant AHT20) |
|---|
| JP1 (default Closed) | Cut to turn off the LED |
|---|---|
| JP2 (default Closed) | Cut to remove the host-side I2C pull-ups |
Performance
Accuracy
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-S61 AHT20 Temperature + Humidity Sensor (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: Adafruit_AHTX0 / CircuitPython, ESPHome
aht10(variant AHT20) - Run an I²C scanner to confirm the address: 0x38
Compare
Which temperature + humidity sensor?
| AHT20 Temperature + Humidity Sensor (this board)This board | ET-S70 SHTC3 Temperature + Humidity Sensor | ET-S11 SHT41 Temperature & Humidity Sensor | ET-S55 HDC1080 Temperature & Humidity | |
|---|---|---|---|---|
| What it does | Budget ±0.3 °C / ±2 %RH sensor, 2.2–5.5 V, Qwiic | ±0.2 °C, ±2 %RH, low-power Sensirion sensor, Qwiic | ±0.2 °C / ±1.8 %RH Sensirion sensor, Qwiic | Low-cost ±0.2 °C / ±2 %RH sensor, Qwiic |
| Interface | I²C fixed 0x38 | I²C fixed 0x70 | I²C, fixed 0x44 | I²C fixed 0x40 |
| Best for | Room and greenhouse monitors | Battery climate sensors | Accurate room climate sensing | Room climate monitors |
| Price | 14 AED | 25 AED | 19 AED | 12 AED |
Downloads
Documents and design files
Need a custom version of this board?
Different connector, size or sensor? We design and build custom variants.