Open ambient sensor
Open ambient sensor is an open source ESP32 PCB design by hubertciebiada: a 2-layer, 120 × 103.5 mm board with 52 components (30 distinct parts). It is built around the LM2596S-5.0/NOPB, TPS62933DRLR. Filed under sensors and iot & wireless.
OAS — Open Ambient Sensor: DIY multi-sensor indoor environmental monitor (CO2, PM, VOC/NOx, temperature/humidity, mmWave presence) on ESP32-C6 with ESPHome / Home Assistant integration
DIY multi-sensor environmental monitor for indoor spaces. Measures air quality and presence; mounts on a standard wall-recessed electrical box; runs ESPHome and integrates natively with Home Assistant.
v0.54 — manufactured, bench-validated and in use. Boards of this revision were fabricated and SMT-assembled at JLCPCB, brought up on the bench with a repeatable per-unit check, and run in a multi-unit deployment as the sensor input for Home Assistant HVAC automations. Working on the delivered hardware: the 24 V power chain, the Sensirion SEN66 (CO₂ / PM / VOC / NOx / T / RH, with Sensirion's…
Built around
Parts list
52 components, 30 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LM2596S-5.0/NOPB LM2596S-5.0 Texas Instruments | TO-263-5_LM2596 | U1 |
| 1 | TPS62933DRLR TPS62933 Texas Instruments | SOT-583-8 | U2 |
| 1 | AO3401A Alpha & Omega Semiconductor | SOT-23 | Q1 |
| 1 | Phoenix_MSTBA_2,5/3-G-5,08 (24V input) | PhoenixContact_MSTBA_2,5_3-G-5,08_1x03_P5.08mm_Horizontal | J1 |
| 1 | SM06B-GHS-TB(LF)(SN) JST SM06B-GHS-TB (SEN66 connector) JST Sales America | JST_GH_SM06B-GHS-TB_1x06-1MP_P1.25mm_Horizontal | J3 |
| 1 | 1x5 P2.54mm header (HLK-LD2410C) | PinHeader_1x05_P2.54mm_Vertical | J4 |
| 1 | ESP32 row A (pins 1..15, antenna-side row) | PinSocket_1x15_P2.54mm_Vertical | J5 |
| 1 | ESP32 row B (pins 16..30, USB-side row) | PinSocket_1x15_P2.54mm_Vertical | J6 |
| 1 | SM04B-SRSS-TB(LF)(SN) JST SM04B-SRSS-TB (Qwiic / Stemma QT) JST Sales America | JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal | J9 |
| 1 | 1812L075/33DR Littelfuse | Fuse_1812L_4532Metric | F1 |
| 1 | SMBJ24A Brightking | D_SMB | D1 |
| 1 | SS14 MDD (Microdiode Semiconductor) | D_SMA | D2 |
| 1 | BZT52C10S 10V Zener 200mW Nanjing Semtech Electronics | D_SOD-323 | D3 |
| 7 | SK6812SIDE-A SK6812-SIDE OPSCO Optoelectronics | SK6812-SIDE | D11, D12, D14, D15, D16, D17, D18 |
| 1 | CKCS5040-33uH/M 33uH CENKER | L_Cenker_CKCS5040 | L1 |
| 1 | CKCS5040-2.2uH/M 2.2uH CENKER | L_Cenker_CKCS5040 | L2 |
| 2 | 100uF/50V | CP_Radial_D8.0mm_P3.50mm | C1, C3 |
| 1 | GRM21BR72A103KA01L 10nF Y2 Murata Electronics | C_0805_2012Metric | C2 |
| 1 | 220uF/10V | CP_Radial_D6.3mm_P2.50mm | C4 |
| 2 | CL21A106KAYNNNE 10uF Samsung Electro-Mechanics | C_0805_2012Metric | C5, C9 |
Show 10 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | CL21A226MAQNNNE 22uF Samsung Electro-Mechanics | C_0805_2012Metric | C6 |
| 8 | CC0603KRX7R9BB104 100nF Yageo | C_0603_1608Metric | C7, C10, C11, C13, C14, C15, C16, C17 |
| 1 | CL10B473KB8NNNC 47nF Samsung Electro-Mechanics | C_0603_1608Metric | C8 |
| 7 | CL05B104KO5NNNC 100nF Samsung Electro-Mechanics | C_0402_1005Metric | C20, C21, C23, C24, C25, C26, C27 |
| 1 | 0603WAF1003T5E 100k 1% UNI-ROYAL (Uniroyal Elec) | R_0603_1608Metric | R1 |
| 1 | 0603WAF1003T5E 100k UNI-ROYAL (Uniroyal Elec) | R_0603_1608Metric | R2 |
| 1 | 0603WAF3092T5E 30.9k UNI-ROYAL (Uniroyal Elec) | R_0603_1608Metric | R3 |
| 1 | 0603WAF1001T5E 1k UNI-ROYAL (Uniroyal Elec) | R_0603_1608Metric | R4 |
| 2 | 0603WAF4701T5E 4.7k UNI-ROYAL (Uniroyal Elec) | R_0603_1608Metric | R5, R6 |
| 1 | 0603WAF1002T5E 10k UNI-ROYAL (Uniroyal Elec) | R_0603_1608Metric | R7 |
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