Smart Lock Controller Design

flux

Work completed
  • Removed U5 and other duplicate 8-pin headers
  • Severed all nets exclusively tied to those removed headers
Remaining tasks
  • Orphan nets and portals cleanup (requires manual removal)
  • Reassign and verify TFT connections on J2: VCC, GND, SCK, SDA, A0/DC, RESET, CS, LED
  • Sever any residual mis-assigned connections and rename nets as needed
  • Run ERC and resolve any errors
Success criteria status
  • Sole 8-pin header retained: in progress
  • Extra headers removed: ✔️
  • Orphan nets cleaned: ❌
  • ERC pass with no header-related errors: ❌
Next step Reassign the TFT signal nets to J2, then run ERC to validate the schematic.

flux

Work completed
  • Removed duplicate 8-pin headers including U5
  • Updated J2 properties to match the ST7735 TFT pinout
  • Severed and deleted nets and net portals exclusively tied to the removed headers
Tasks remaining
  • Rename and verify the eight TFT signal nets on J2 (VCC, GND, SCK, SDA, A0/DC, RESET, CS, LED)
  • Run ERC and fetch the report
  • Resolve any ERC errors (orphan nets, missing connections)
Success criteria review
  • Sole 8-pin TFT header retained: ✅
  • Extra headers removed: ✅
  • Orphan nets/portals cleaned: ✅
  • ERC passes without header-related errors: ❌ (pending ERC run)
Recommended next step Rename the J2 nets to their correct TFT signal names, then run ERC to validate and fix any remaining schematic errors.
U2
U3
U1 3V3 - U3 OUT+
U1 3V3 - U3 OUT+
U1 D22 - U4 IN
U1 3V3 - U3 OUT+
U1 D21 - U6 IN
U1 3V3 - U3 OUT+
U1 3V3 - U3 OUT+
U1 3V3 - U3 OUT+
U1 3V3 - U3 OUT+
R_BL P2 - U5 8
R2 P2 - LED2 A
U1 3V3 - U3 OUT+
U1 3V3 - U3 OUT+
U1 3V3 - U3 OUT+
R1 P1 - U2 OUT+
U1 3V3 - U3 OUT+
C1 P1 - U2 IN+
U1 3V3 - U3 OUT+
U1 3V3 - U3 OUT+
LED2
LED1
F1
U5
C2
Capacitance
0.1uF
U5
U6
GND
  • Generic Inductor
    Generic Inductor
    A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
    jharwinbarrozo
    16.3k
  • Generic Capacitor
    Generic Capacitor
    A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibrary
    jharwinbarrozo
    1.5M
  • Generic Resistor
    Generic Resistor
    A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibrary
    jharwinbarrozo
    1.5M
  • Ground
    Ground
    A common return path for electric current. Commonly known as ground.
    jharwinbarrozo
    20.5M
  • Terminal
    Terminal
    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
    natarius
  • Net Portal
    Net Portal
    Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
    jharwinbarrozo
    43.0M
  • RMCF0805JT47K0
    RMCF0805JT47K0
    General Purpose Thick Film Standard Power and High-Power Chip Resistor 47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film Features: - RMCF – standard power ratings - RMCP – high power ratings - Nickel barrier terminations standard - Power derating from 100% at 70ºC to zero at +155ºC - RoHS compliant, REACH compliant, and halogen free - AEC-Q200 compliant
    jharwinbarrozo
    1.2M
  • 875105359001
    875105359001
    10 µF 16 V Aluminum - Polymer Capacitors Radial, Can - SMD 30mOhm 2000 Hrs @ 105°C #commonpartslibrary #capacitor #aluminumpolymer #radialcan
    jharwinbarrozo
    1.2M
  • CTL1206FYW1T
    CTL1206FYW1T
    Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric)
    jharwinbarrozo
    1.1M
  • 1070TR
    1070TR
    Battery Holder (Open) Coin, 20.0mm 1 Cell SMD (SMT) Tab bate or batt #forLedBlink
    jharwinbarrozo
    700.5k

Instant Chocolate Holodeck

Instant Chocolate Holodeck thumbnail
ESP32 Single Relay Controller with 1.8" ST7735 TFT Display and Enhanced Power Management

Properties

10

Arduino

96.0 mm x 60.0 mm

Display

Consumer Electronics

WiFi

graph LR P12[+12V_IN] --> F1[Fuse F1] F1 --> D1[SS54 Schottky Diode] D1 --> D2[SMBJ18A TVS] D2 --> BulkCap[Input Bulk Capacitor] BulkCap --> Buck5[MP1584 Buck 5V] BulkCap --> Buck3.3[MP1584 Buck 3.3V] Buck5 --> V5[+5V Rail] Buck3.3 --> V3[+3V3 Rail] V3 --> ESP[ESP32 Dev Module] ESP --> TFT[ST7735 TFT Display] ESP --> RL1[Relay Module U4] ESP --> RL2[Relay Module U6] RL1 --> Sol1[Solenoid 1] RL2 --> Sol2[Solenoid 2] V5 --> LED5[5V LED Indicator] V3 --> LED3[3.3V LED Indicator] ESP -->|BLE| BLE ESP -->|WiFi| MQTT

RoHS

Top and Bottom layers

2-layer FR4, 1.6 mm thickness, 1 oz copper

Mains

Bluetooth

15 mm x 5 mm; apply keepout at module antenna region as per footprint

graph LR P12[+12V_IN] --> F1[Fuse F1] F1 --> D1[SS54 Schottky Diode] D1 --> D2[SMBJ18A TVS] D2 --> BulkCap[Input Bulk Capacitor] BulkCap --> Buck5[MP1584 Buck 5V] BulkCap --> Buck3.3[MP1584 Buck 3.3V] Buck5 --> V5[+5V Rail] Buck3.3 --> V3[+3V3 Rail] V3 --> ESP[ESP32 Dev Module] ESP --> TFT[TFT Header (8-pin)] ESP --> RL1[Relay Module U4] RL1 --> Sol1[Solenoid 1] V5 --> LED5[5V LED Indicator] V3 --> LED3[3.3V LED Indicator] ESP -->|BLE| BLE ESP -->|WiFi| MQTT

Pricing & Availability

Distributor

Qty 1

Arrow

$2.62–$35.59

Digi-Key

$3.01–$94.21

LCSC

$4.69–$5.46

Mouser

$3.74–$6.70

TME

$0.99

Verical

$2.70–$51.79

Controls