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5V Double Channel Relay Module 10A pinout

Explore the relay contacts, control inputs and split-supply jumper on Kobee’s 5 V double-channel relay module, with prominent low-voltage safety guidance.

GenericElectronic moduleDual-channel optocoupled relay circuitCurrent Kobee listing, board revision unconfirmed13 connections
5V Double Channel Relay Module 10A board artworkKobee

Mains voltage can kill

This exposed hobby module is sold for low-voltage loads only. Do not connect household mains to NO, COM or NC; use properly rated enclosed equipment and a licensed electrician for mains work.

VCC, JD-VCC and the jumper

With the factory jumper fitted, VCC and JD-VCC share one regulated 5 V supply. Removing it can separate the relay-coil supply, but the exact ground and isolation arrangement must be verified on the physical board first.

Revision still needs a bench check

Confirm the PCB markings, jumper orientation, input active level and relay part number against physical Kobee stock before publishing this draft.

Qualified electrical ratings

recommended operating5 V voltage · inputNominal VCC / JD-VCC relay-module supply; exact tolerance and control thresholds remain unverified

Fast answers

Which GPIO should I use?

Start with what you are connecting. Click any GPIO to locate it in the interactive diagram and inspect the full reason.

Interactive shortlist
Pin colour keyKobee
RecommendedUse with careAvoidSpecial case
Recommendation and GPIOs
Easy choice
No matching pins declared

Input-capable, no declared boot warning, and suitable for the ESP32 internal pull resistor.

Add an external resistor
No matching pins declared

Excellent inputs, including ADC1, but these input-only pins have no internal pull-up or pull-down.

Works with care
No matching pins declared

These pins are sampled during boot or share the programming serial connection. Your button circuit must not force the wrong reset-time level.

Do not use
No matching pins declared

Connected to the module flash. Treat these header positions as reserved.

Reference by function

See only the pins relevant to your circuit.

Each view removes the unrelated labels, then keeps the exact channel, bus role, and assignment status beside the physical board position.

What this reference covers

This draft models the current Kobee listing for the blue 5 V two-channel relay module shown in the product photography. The board has two three-position load terminal blocks, a four-pin control header and a three-pin relay-supply header with a removable VCC / JD-VCC jumper.

The exact PCB revision and relay manufacturer markings still need to be checked against physical Kobee stock before publication. Similar-looking relay boards can use different input circuits, active levels and jumper arrangements.

Low-voltage projects only

Kobee’s current product record deliberately limits this module to low-voltage loads. Do not use the exposed screw terminals for household mains. Electricity can cause shock, burns, fire or death; mains electrical work belongs with an appropriately licensed electrician and properly rated, enclosed equipment.

Relay contacts

Each channel is a single-pole, double-throw switch:

  • COM is the moving common contact.
  • NC is connected to COM while the relay is not energised.
  • NO is connected to COM while the relay is energised.

The contact labels describe switching state only. They do not make a load safe or establish a usable current for every voltage, load type or enclosure.

Control and relay power

The control header exposes VCC, IN2, IN1 and GND. The separate JD-VCC header powers the relay side. With the factory jumper fitted, VCC and JD-VCC share the same 5 V supply. Removing the jumper can separate the controller-side and relay-side supplies, but only when the exact board revision and grounding arrangement have been verified.

Do not assume that a 3.3 V controller will reliably trigger IN1 or IN2. The input threshold and active polarity remain unverified for this generic revision.

Quick explanations

Dual-channel optocoupled relay circuit pinout FAQ

What do NO, NC and COM mean on a relay module?

COM is the moving common contact. NC is connected to COM while the relay is not energised, and NO is connected to COM while it is energised. Those labels describe switching state, not a safe voltage or current rating.

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Complete pin table

Every physical connection and declared alternate function is included here for accessibility, printing and search discovery.

PhysicalPinInput / outputGeneral suitabilityFunctionsImportant notes
R1-NONO1Normally open, Channel 1 NO—Outputconditional
  • Relay contact · NO · CH1 · fixed
  • • Open while relay 1 is de-energised
  • • Connected to COM1 while relay 1 is energised
  • • Low-voltage loads only; do not connect household mains.
R1-COMCOM1Common, Channel 1 commonInput + Outputconditional
  • Relay contact · COM · CH1 · fixed
  • • Connects to NC1 when de-energised and NO1 when energised
  • • Low-voltage loads only; do not connect household mains.
R1-NCNC1Normally closed, Channel 1 NC—Outputconditional
  • Relay contact · NC · CH1 · fixed
  • • Connected to COM1 while relay 1 is de-energised
  • • Open while relay 1 is energised
  • • Low-voltage loads only; do not connect household mains.
R2-NONO2Normally open, Channel 2 NO—Outputconditional
  • Relay contact · NO · CH2 · fixed
  • • Open while relay 2 is de-energised
  • • Connected to COM2 while relay 2 is energised
  • • Low-voltage loads only; do not connect household mains.
R2-COMCOM2Common, Channel 2 commonInput + Outputconditional
  • Relay contact · COM · CH2 · fixed
  • • Connects to NC2 when de-energised and NO2 when energised
  • • Low-voltage loads only; do not connect household mains.
R2-NCNC2Normally closed, Channel 2 NC—Outputconditional
  • Relay contact · NC · CH2 · fixed
  • • Connected to COM2 while relay 2 is de-energised
  • • Open while relay 2 is energised
  • • Low-voltage loads only; do not connect household mains.
J1-1VCCLogic supplyInputunavailable
  • Power · controller-side 5 V supply · fixed
  • • Supply with regulated 5 V only; do not apply a higher voltage.
  • • recommended operating: 5 V input — Nominal controller-side module supply; exact tolerance unverified
J1-2IN2Channel 2 triggerInputconditional
  • Control signal · relay trigger · CH2 · fixed
  • • Do not assume 3.3 V logic compatibility or active-low behaviour; verify the exact board revision.
J1-3IN1Channel 1 triggerInputconditional
  • Control signal · relay trigger · CH1 · fixed
  • • Do not assume 3.3 V logic compatibility or active-low behaviour; verify the exact board revision.
J1-4GND—unavailable
  • Ground · controller-side return · fixed
    J2-1GNDRelay supply return—unavailable
    • Ground · relay-side return · fixed
    • • Grounding and isolation arrangement require verification with the jumper removed
    J2-2VCCJumper linkInputunavailable
    • Power · controller-side supply jumper · fixed
    • • Normally jumpered to JD-VCC for a single 5 V supply
    • • Confirm jumper orientation before applying power.
    • • recommended operating: 5 V input — Nominal module supply; exact tolerance unverified
    J2-3JD-VCCRelay coil supplyInputunavailable
    • Power · relay-side 5 V supply · fixed
    • • Use regulated 5 V only and verify the ground/isolation arrangement before removing the jumper.
    • • recommended operating: 5 V input — Nominal relay-coil supply; exact tolerance unverified

    Keep making

    Use this pinout on the bench.

    Product5V Double Channel Relay Module 10A