KiCad project files for a breakout board using the Rohm Semiconductor BH1900NUX temperature sensor.
The breakout board simplifies the integration of the BH1900NUX temperature sensor into your projects.
The main goal of this PCB is to have a very compact design that ultimately fits into a stainless steel sleeve with a diameter of around 5mm.
- Compact design of less than 18mm² (0,028 square inch).
- Connector compatible with many I²C ecosystems
- A1 pin Supported (solder jumper on the back)
- A2 pin Supported (solder jumper on the back)
- A3 pin Supported (solder jumper on the back)
- ALERT pin NOT supported (Pin is not exposed on the PCB)
| Pin # | Function |
|---|---|
| 1 | GND |
| 2 | 3.3V |
| 3 | SDA |
| 4 | SCL |
The pinout layout is widely used across different vendors of breakout boards with JST SH connector, allowing to use multiple different sensors on one bus more easily. Although the pin layout is (often) the same, each vendor uses their own brand names (e.g: Qwiic/STEMMA, μŠup, easyC)
Caution
The design is not 5V compliant and 5V will destroy the sensor.
Use 3.3V only.
Figure: BH1900NUX sensor breakout board top view (Rohm Semiconductor)
Figure: BH1900NUX sensor breakout board top view (Rohm Semiconductor)
Figure: BH1900NUX sensor breakout board back view (Rohm Semiconductor)
Figure: BH1900NUX sensor breakout board bottom view (Rohm Semiconductor)
| ID / Ref. | Designator | Quantity | Description | Part No. |
|---|---|---|---|---|
| R1,R4,R5 | R_0201_0603Metric | 3 | Resistor, 10k Ohm, SMD | ERJ-1GNF1002C |
| R3,R2 | R_0201_0603Metric | 2 | Resistor, 3.3k Ohm, SMD | ERJ-1GNF3301C |
| J1 | JST_SH_SM04B-SRSS-TB_1x04 | 1 | 01x04 JS SH 1.0mm Horizontal | SM04B-SRSS-TB |
| U1 | VSON008X2030_ROM | 1 | Rohm BH1900NUX-TR IC | BH1900NUX-TR |
| C1 | C_0201_0603Metric | 1 | Capacistor, Ceramic 100nF | GRT033C81E104KE01D |
PCBWay was so kind to help me to realize this project by sponsoring it.
Overall I am very statisfied with the quality of the PCB.
If you plan to produce and assembly the board I can recommend using PCBWay.
The board looks high-quality, the corners and edges are cleanly cut, and there are no rough breaks, as is often the case with other boards.
There are no visible residues of flux, which is important not only for aesthetic reasons, but also because flux residues can be corrosive.
Moreover my service contact during the order process was very patient with me and helped me to fix two issues I had with my design.
Have a look on you own below:
Official BH1900NUX Product Page (ROHM Website)
PCBWay (Offical Website)
BH1900NUX ESPHome component (ESPHome support)