embeddedalpha/Digital-Humidity-Gauge🎯 Dry‑bulb Temperature 🎯 Relative humidity 🎯 Barometric pressure 🎯 Saturation vapour pressure 🎯 Actual vapour pressure 🎯 Humidity (mixing) ratio 🎯 Absolute humidity 🎯 Dew‑point temperature 🎯 Wet‑bulb…
Digital Humidity Gauge is an open-source printed circuit board by embeddedalpha, from the embeddedalpha/Digital-Humidity-Gauge repository on GitHub. It is a 2-layer board of 50 × 50 mm with 68 parts on 74 nets, routed with 75 tracks and 3 vias.
It is built around the THVD1450D, BME280 and TPS54302, with the SMAJ7.0CA among its other parts. Its parts include 30 capacitors, 20 resistors, 6 ICs, 4 diodes and 2 connectors. It belongs with the STM32 boards of this library.
🎯 Dry‑bulb Temperature
🎯 Relative humidity
🎯 Barometric pressure
🎯 Saturation vapour pressure
🎯 Actual vapour pressure
🎯 Humidity (mixing) ratio
🎯 Absolute humidity
🎯 Dew‑point temperature
🎯 Wet‑bulb temperature
🎯 Enthalpy
🎯 Specific volume
🎯 Moist‑air density 📁 Case
📁 Firmware
📁 Marketing and Documentation
📁 Media
📁 PCB
📁 Software
📁 Simulations
📁 Wires and Cables
📄 README.md| Qty | Value | Footprint | References |
|---|---|---|---|
| 11 | 100nF | Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C502, C506, C508, C509, C510, C511, C513, C514, C515, C516, C517 |
| 6 | 10R | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R801, R802, R803, R804, R805, R806 |
| 4 | 0.1uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C602, C603, C801, C902 |
| 4 | 100nF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C701, C702, C703, C704 |
| 4 | 4.7k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R701, R702, R703, R704 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1001, H1002, H1003, H1004 |
| 4 | SMAJ7.0CA | Diode_SMD:D_SMA | D801, D802, D901, D902 |
| 3 | 22uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C604, C605, C606 |
| 3 | 4.7K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R501, R502, R503 |
| 3 | 4.7uF | Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C505, C507, C512 |
| 3 | R | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R603, R604, R605 |
| 2 | 1uF | Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C501, C503 |
| 2 | 60R | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R901, R902 |
| 2 | BME280 | Package_LGA:Bosch_LGA-8_2.5x2.5mm_P0.65mm_ClockwisePinNumbering | U701, U702 |
| 2 | Conn_01x04 | Connector_JST:JST_PH_S4B-PH-K_1x04_P2.00mm_Horizontal | J801, J901 |
| 1 | 105K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R602 |
| 1 | 10nF | Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C504 |
| 1 | 10uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C601 |
| 1 | 10uH | Inductor_SMD:L_APV_ANR5045 | L601 |
| 1 | 4700pF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C901 |
| 1 | 511K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R601 |
| 1 | LOGO | Blackshield_Engineering:Company Logo | G*** |
| 1 | MCP2557FD-xMF | Package_DFN_QFN:DFN-8-1EP_3x3mm_P0.65mm_EP1.55x2.4mm | U901 |
| 1 | STM32G431CBTx | Package_QFP:LQFP-48_7x7mm_P0.5mm | U501 |
| 1 | THVD1450D | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U801 |
| 1 | TPS54302 | Package_TO_SOT_SMD:SOT-23-6 | U601 |
It measures 50 × 50 mm and has 2 copper layers, 1.6 mm thick.
68 parts, built around the THVD1450D, BME280, TPS54302 and SMAJ7.0CA. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the embeddedalpha/Digital-Humidity-Gauge repository on GitHub, at the commit this page was made from: the board is PCB/V101/V101.kicad_pcb and its schematic PCB/V101/Block_Diagram.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask embeddedalpha before reusing the design.
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