boernerc20/esphome-room-nodeESPHome-based smart room node for Home Assistant — temp/humidity, e-ink display, voice satellite, LED ring
Room node is an open-source printed circuit board by boernerc20, from the boernerc20/esphome-room-node repository on GitHub. It is a 4-layer board of 89.5 × 38 mm with 57 parts on 59 nets, routed with 447 tracks and 155 vias.
It is built around the ESP32-S3-WROOM-1-N16R8, AHT20 and MAX98357AETE+T, with the USBLC6-2SC6, KT-0805G and SPH0645LM4H-B among its other parts. Its parts include 17 capacitors, 15 resistors, 5 ICs, 4 connectors and 2 switches. It belongs with the home automation and IoT and lEDs and displays boards and the ESP32 boards of this library.
An ESP32-S3 voice assistant and room sensor for Home Assistant, built on ESPHome. Wake word ("hey jarvis") on the device, temperature and humidity, e-ink display, LED status ring.
Status: breadboard works end to end. Next: rev A PCB in KiCad.
| Path | What |
|---|---|
room-node.yaml | ESPHome firmware (breadboard pins) |
docs/breadboard.md | Breadboard wiring |
docs/pcb/pinout.md | Rev A PCB pinout |
docs/pcb/schematic.md | Rev A schematic, sheet by sheet — draw from this |
docs/pcb/layout.md | Rev A board (placed + routed), assembly and bring-up |
docs/enclosure.md | Enclosure notes |
kicad/room-node/ | KiCad project |
reports/bom/rev-a-bom-lcsc.csv | Rev A BOM with LCSC numbers |
models/ | Wake word model |
secrets.yaml.example to secrets.yaml and fill it in. Git ignores it.esphome run room-node.yaml — USB the first time, then OTA (192.168.1.50).Built by Chris Boerner.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 0.1µF | Capacitor_SMD:C_0603_1608Metric | C2, C5, C7, C9, C10, C21, C40, C50 |
| 4 | M2 | MountingHole:MountingHole_2.2mm_M2 | H1, H2, H3, H4 |
| 3 | 33Ω | Resistor_SMD:R_0603_1608Metric | R9, R10, R11 |
| 2 | 100k | Resistor_SMD:R_0603_1608Metric | R8, R20 |
| 2 | 100k 1% | Resistor_SMD:R_0603_1608Metric | R6, R7 |
| 2 | 10k | Resistor_SMD:R_0603_1608Metric | R3, R4 |
| 2 | 10µF 16V | Capacitor_SMD:C_0805_2012Metric | C1, C22 |
| 2 | 1µF | Capacitor_SMD:C_0603_1608Metric | C3, C8 |
| 2 | 22µF 10V | Capacitor_SMD:C_0805_2012Metric | C4, C6 |
| 2 | 4.7k | Resistor_SMD:R_0603_1608Metric | R40, R41 |
| 2 | 5.1k 1% | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 1 | +3V3 | TestPoint:TestPoint_Pad_D1.5mm | TP5 |
| 1 | +5V | TestPoint:TestPoint_Pad_D1.5mm | TP6 |
| 1 | 1000µF 16V | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C30 |
| 1 | 100pF C0G | Capacitor_SMD:C_0603_1608Metric | C11 |
| 1 | 1k | Resistor_SMD:R_0603_1608Metric | R12 |
| 1 | 470µF 16V | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C20 |
| 1 | 470Ω | Resistor_SMD:R_0603_1608Metric | R30 |
| 1 | AHT20 | room-node:AHT20 | U6 |
| 1 | AP7361C-33ER-13 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U2 |
| 1 | CC_SENSE | TestPoint:TestPoint_Pad_D1.5mm | TP8 |
| 1 | EN | TestPoint:TestPoint_Pad_D1.5mm | TP1 |
| 1 | ESP32-S3-WROOM-1-N16R8 | RF_Module:ESP32-S3-WROOM-1 | U1 |
| 1 | GND | TestPoint:TestPoint_Pad_D1.5mm | TP7 |
| 1 | IO0 | TestPoint:TestPoint_Pad_D1.5mm | TP2 |
| 1 | KT-0805G green | LED_SMD:LED_0805_2012Metric | D1 |
| 1 | LED strip | Connector_JST:JST_XH_S3B-XH-A_1x03_P2.50mm_Horizontal | J4 |
| 1 | MAX98357AETE+ | Package_DFN_QFN:TQFN-16-1EP_3x3mm_P0.5mm_EP1.23x1.23mm | U3 |
| 1 | RXD0 | TestPoint:TestPoint_Pad_D1.5mm | TP4 |
| 1 | SPH0645LM4H-B | Sensor_Audio:Knowles_SPH0645LM4H-6_3.5x2.65mm | MK1 |
| 1 | Speaker 8Ω | Connector_JST:JST_PH_B2B-PH-SM4-TB_1x02-1MP_P2.00mm_Vertical | J2 |
| 1 | TL3342 BOOT | Button_Switch_SMD:SW_SPST_TL3342 | SW2 |
| 1 | TL3342 RESET | Button_Switch_SMD:SW_SPST_TL3342 | SW1 |
| 1 | TXD0 | TestPoint:TestPoint_Pad_D1.5mm | TP3 |
| 1 | USB4085-GF-A | Connector_USB:USB_C_Receptacle_GCT_USB4085 | J1 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U5 |
| 1 | Waveshare e-paper | Connector_JST:JST_PH_S8B-PH-SM4-TB_1x08-1MP_P2.00mm_Horizontal | J3 |
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It measures 89.5 × 38 mm and has 4 copper layers, 1.6 mm thick.
57 parts, built around the ESP32-S3-WROOM-1-N16R8, AHT20, MAX98357AETE+T and USBLC6-2SC6. 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 boernerc20/esphome-room-node repository on GitHub, at the commit this page was made from: the board is kicad/room-node/room-node.kicad_pcb and its schematic kicad/room-node/audio_out.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 boernerc20 before reusing the design.