# Cautious Aqua TV Glasses ## Description Smart Intercom Adapter for Analog Door Intercom using ESP32 ## Project Details - **Owner:** kghayad - **Created:** 3/7/2026 - **Last Updated:** 3/7/2026 - **Visibility:** Public - **System Architecture:** flowchart TD Phone["Smartphone SIP App"] -->|"WLAN"| ESP["ESP32-LyraT-Mini"] subgraph Adapter["Smart Intercom Adapter PCB"] PWR["5V input and 3.3V LDO"] Ring["Ring detect divider rectifier RC opto"] AudioIn["Audio in 600:600 xfmr AC couple"] AudioOut["Audio out 10k pot AC couple optional xfmr via jumper"] Door["Door unlock GPIO driver PhotoMOS"] Hdr["ESP32 interface header"] Term["Intercom 6p terminal"] end ESP -->|"AUDIO_OUT"| AudioOut AudioOut -->|"MIC+ MIC-"| Term Term -->|"SPK+ SPK-"| AudioIn AudioIn -->|"AUDIO_IN"| ESP Term -->|"SPK+ SPK-"| Ring Ring -->|"GPIO_RING"| ESP ESP -->|"GPIO_DOOR"| Door Door -->|"DOOR_SW1 DOOR_SW2"| Term PWR -->|"3.3V"| Hdr PWR -->|"GND"| Hdr Hdr -->|"Signals"| ESP PWR -->|"5V"| Adapter ## Key Components ### D1 — [1N4148WS-7-F](https://www.flux.ai/adrian95/1n4148ws-7-f~jvm.md) - Part Type: Diode - Manufacturer Part Number: 1N4148WS-7-F - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Ring detect rectification (envelope detector) - Role: Rectifier - Datasheet URL: https://www.diodes.com/assets/Datasheets/1N4148WS_BAV16WS.pdf - Package: SOD-323 - Manufacturer Name: Diodes Incorporated **Pins:** - A [pin 2] - K [pin 1] ### D2 — [1N4148WS-7-F](https://www.flux.ai/adrian95/1n4148ws-7-f~jvm.md) - Part Type: Diode - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: 1N4148WS-7-F - Role Details: Ring detect rectification (envelope detector) - Package: SOD-323 - Datasheet URL: https://www.diodes.com/assets/Datasheets/1N4148WS_BAV16WS.pdf - Role: Rectifier - Manufacturer Name: Diodes Incorporated **Pins:** - A [pin 2] - K [pin 1] ### J1 — [Pin Header 01x06 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x06-2p54mm-vertical~lzd.md) - Package: THT_1x6_2.54mm - License: https://creativecommons.org/licenses/by/4.0/ - Role: Connector - Role Details: ESP32 interface: 3.3V, GND, GPIO_RING, GPIO_DOOR, AUDIO_IN, AUDIO_OUT - Part Type: Connector **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] - Pin_5 [pin 5] - Pin_6 [pin 6] ### J2 — [691137710006](https://www.flux.ai/adrian95/691137710006~j0n.md) - Manufacturer Name: Würth Elektronik - License: https://creativecommons.org/licenses/by/4.0/ - Connector Positions: 6 - Role: Connector - Connector Rows: 1 - Manufacturer Part Number: 691137710006 - Package or Case Code: //www.snapeda.com/parts/691137710006/W%25C3%25BCrth+Elektronik+Midcom/view-part/?ref=eda - Voltage: 300V - Datasheet URL: https://www.we-online.com/katalog/datasheet/691137710006.pdf - Operating Temperature: -30°C ~ 120°C - Part Type: Connector - Role Details: Intercom connector: SPK+, SPK-, MIC+, MIC-, DOOR_SW1, DOOR_SW2 - Package: THT - Current: 16A - Connector Pitch: 5mm **Pins:** - ~ [pin 5] - ~ [pin 2] - ~ [pin 3] - ~ [pin 6] - ~ [pin 1] - ~ [pin 4] ### J3 — [DG250-3.5-02P-11-00A(H)](https://www.flux.ai/adrian95/dg250-3p5-02p-11-00ah~77l.md) - License: https://creativecommons.org/licenses/by/4.0/ - Package: THT - Manufacturer Part Number: DG250-3.5-02P-11-00A(H) - Manufacturer Name: Degson - Role Details: 5V input screw terminal (VIN_5V, GND) - Part Type: Connector - Role: Connector - Datasheet URL: https://www.tme.com/Document/74a50bb60bd70b3c953bc54e89073085/DG250-3.5.pdf **Pins:** - 1 [pin 1] - 2 [pin 2] ### JP1 — [68786-202LF](https://www.flux.ai/adrian95/68786-202lf~c2w.md) - Manufacturer Part Number: 68786-202LF - Datasheet URL: https://cdn.amphenol-cs.com/media/wysiwyg/files/drawing/68786.pdf - Package: THT_1x2_2.54mm - Manufacturer Name: Amphenol ICC (FCI) - Role: Jumper - Part Type: Connector - Role Details: Select direct AC-coupled audio-out vs transformer-isolated path - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 1 [pin 1] - 2 [pin 2] ### Q1 — [MMBT3904LT1G](https://www.flux.ai/openpartlist/mmbt3904lt1g~s5.md) - Datasheet URL: https://www.onsemi.com/pdf/datasheet/mmbt3904lt1-d.pdf - Role: Driver - Manufacturer Part Number: MMBT3904LT1G - Manufacturer Name: onsemi - Part Type: Transistor - Role Details: NPN low-side switch to drive PhotoMOS input LED from GPIO_DOOR via base resistor - License: https://creativecommons.org/licenses/by/4.0/ - Package: SOT-23 **Pins:** - B [pin 1] - C [pin 3] - E [pin 2] ### T1 — [TY-145P](https://www.flux.ai/adrian95/ty-145p~glw.md) - Role Details: 600:600 audio isolation transformer (1:1) for visitor audio from SPK lines - Role: Transformer - Manufacturer Part Number: TY-145P - Part Type: Transformer - Package: THT - Datasheet URL: http://catalog.triadmagnetics.com/Asset/TY-145P.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Triad Magnetics **Pins:** - ~ [pin 6] - ~ [pin 2] - ~ [pin 1] - ~ [pin 3] - ~ [pin 4] - ~ [pin 5] ### U1 — [AMS1117-3.3](https://www.flux.ai/adrian95/ams1117-33~v2u.md) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.snapeda.com/parts/AMS1117-3.3/Advanced%20Monolithic%20Systems/view-part/?ref=search&t=AMS1117-3.3 - Manufacturer Name: ams - Role Details: 5V input to 3.3V rail for logic/optocoupler and interface circuits - Part Type: Integrated Circuit - Package: SOT-223 - Manufacturer Part Number: AMS1117-3.3 - Role: Regulator **Pins:** - GND [pin 1] - VI [pin 3] - VO [pin 2] ### U2 — [PC817C](https://www.flux.ai/lcsc/pc817c~3vwa.md) - Package: DIP-4 - Manufacturer Name: 华润华晶 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1809251512_Wuxi-China-Resources-Huajing-Microelectronics-PC817C_C115500.pdf - Manufacturer Part Number: PC817C - Role Details: Optocoupler for ring detect output to GPIO_RING - Product Info Url: https://lcsc.com/product-detail/DIP-Optocouplers_PC817C_C115500.html - LCSC Part Number: C115500 - Role: Isolation - Part Type: Optocouplers - Phototransistor Output - Package or Case Code: DIP-4_L4.6-W6.5-P2.54-LS7.6-BL - JLCPCB Part Class: Extended Part **Pins:** - AN [pin 1] - CAT [pin 2] - COL [pin 4] - EM [pin 3] ### U3 — [AQY212GS](https://www.flux.ai/lcsc/aqy212gs~k2jr.md) - Package or Case Code: SOP-4_L4.4-W4.3-P2.54-LS6.8-BL - Part Type: Solid State Relays - MOS Output (PhotoMOS) - Manufacturer Part Number: AQY212GS - LCSC Part Number: C719745 - JLCPCB Part Class: Extended Part - Role Details: PhotoMOS relay in parallel with intercom door button - Manufacturer Name: PANASONIC(松下) - Package: SOP-4 - Role: Switch **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 4] - 4 [pin 4] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/kghayad/cautious-aqua-tv-glasses~kr](https://www.flux.ai/kghayad/cautious-aqua-tv-glasses~kr).* --- *Generated from [https://www.flux.ai/kghayad/cautious-aqua-tv-glasses~kr](https://www.flux.ai/kghayad/cautious-aqua-tv-glasses~kr)*