The TFMini-S has a 4-wire connector identical to TF-Luna’s. The main difference is current draw — 140 mA vs 70 mA — so a heavier supply may be needed if you’re running multiple sensors.
Pinout
| Pin | Color (typical) | Function |
|---|---|---|
| 1 | Red | VCC (+5 V, ~140 mA) |
| 2 | Black | GND |
| 3 | White | TX → MCU RX |
| 4 | Green | RX ← MCU TX |
Notes
- Common ground mandatory.
- 5 V supply must handle 140 mA per sensor + transient peaks.
- No I²C mode on standard TFMini-S — it’s UART only. (Vs TF-Luna which has selectable I²C.)
Where to go next
- TFMini hub
- Description
- TF-Luna wiring — similar approach