Marine LED Controller Design

flux

1:54

Consulting on touch connectors.

Exploring WLED touch features.

Addressing WLED touch replication.

Linking components accurately.

Mapping ESP32 touch GPIOs.

Accessing knowledge base.

Looking for "capacitive touch pins list" in esp32_datasheet_en.pdf

Looking for "GPIO mapping for touch channels T0 to T9" in esp32_datasheet_en.pdf

Looking for "recommended pins for capacitive touch on module" in esp32_datasheet_en.pdf

Looking for "touch sensor peripheral electrical characteristics input capacitance cable length guidelines" in esp32_datasheet_en.pdf

Searching web for: "ESP32 touch pins T0 T9 mapping GPIO list datasheet"

Found 1 results.

Proposing remote touch solutions.

Great idea. Short version: the ESP32 can expose many touch channels, but raw capacitive touch does not travel well over wires. Break out several local touch pads/connectors on the master, and if you need remote touch at slaves, use a small touch-to-digital converter locally and return a clean digital signal to the master.
What WLED/ESP32 can support
  • Hardware: U3 supports up to 10 capacitive touch channels (T0–T9). Safe-to-use pins (avoid boot strapping pins) are typically: T8=GPIO33, T9=GPIO32, T7=GPIO27, T6=GPIO14, T4=GPIO13, T0=GPIO4.
  • Software: WLED supports at least one touch/button input out of the box. Multiple independent touch inputs may require custom configuration/usermod. Plan hardware breakouts now; firmware can map them later.
Proposed touch breakouts on this board (through-holes or pads)
  • TOUCH1: GPIO33 (T8) on U3
  • TOUCH2: GPIO32 (T9)
  • TOUCH3: GPIO27 (T7)
  • TOUCH4: GPIO14 (T6)
  • TOUCH5: GPIO13 (T4)
  • TOUCH6: GPIO4 (T0) Notes:
  • Label each as TOUCHx and provide an adjacent GND through-hole for shield/frame wiring.
  • Place a small series resistor at the MCU side (100–470 Ω) and an ESD path near the connector (e.g., a low-cap TVS Diode). We can also tie these lines into the existing ESD array D1 if channels are available.
About long cables and multiple slaves
  • Raw capacitive touch over long leads is very sensitive to cable capacitance and noise. Expect unreliable behavior as length increases; shielding and careful routing help but only to a point.
  • Recommended for remote/slave locations:
    • Put a tiny touch IC at each remote point (e.g., AT42QT1010 or TTP223) and output a clean digital signal back to the master. Protect with series resistor + TVS at the connector.
    • If you only need an “any touch” signal from 6 slaves, wire-OR the open-drain outputs (or diode-OR) to a single input on the master with a pull-up at the master.
    • For long runs or noisy marine wiring, consider differential signaling (RS-485 transceivers) for robustness, still driven by the remote touch IC’s digital output.
WS driver data routing recap
  • Keep ESP32 D1 (selected GPIO) -> WS2805 DIN1.
  • Board “DATA IN” connector -> WS DIN2 (or selectable via solder-jumper).
  • WS DOUT -> “DATA OUT” connector.
  • This preserves master/slave chaining without needing the ESP32 populated.
Want me to add six TOUCHx + GND through-hole pairs (with series resistors and ESD footprints) and assign them to GPIO33, 32, 27, 14, 13, 4 on U3? If yes, also tell me:
  • Approximate cable lengths to the touch contacts.
  • Whether you prefer local remote touch ICs at slaves (recommended) or raw touch lines back to the master.
Define cable lengths
Choose remote IC approach
Ask about WLED limits
Request connector guidance
Ask about combining slave signals
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D4
D3
D4
D2
D4
D4
R11 P2 - D3 2
R1 P2 - Q1 G
C2 P1 - U2 LX
J1 2 - GND GND
J1 2 - GND GND
C4 P1 - U2 BOOT
D3 1 - D2 2
J1 2 - GND GND
J1 2 - GND GND
J1 2 - GND GND
U1 VS - U2 VIN
U1 VS - U2 VIN
Q1 D - R11 P1
D3 1 - D2 2
Q4
Not Recommended for New Designs
C3
Capacitance
22 uF
C1
Capacitance
10 uF
Q3
Not Recommended for New Designs
C4
Capacitance
0.1 uF
C2
Capacitance
0.1 uF
D1
Q5
Not Recommended for New Designs
Q2
Not Recommended for New Designs
Q1
Not Recommended for New Designs
  • Ground
    Ground
    A common return path for electric current. Commonly known as ground.
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  • Generic Resistor
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  • 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
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    RMCF0805JT47K0
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Led Design thumbnail
Marine-Grade 5-Channel PWM LED Controller with ESP32 and Integrated 12V→5V Buck

Properties

mm
mm

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$0.52–$1.98

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