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BL602 IoT Lamp Breakout Board: Pinout Layout & Flashing Tips

bl602newbie 7539 34
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How do I identify the BL602 breakout board pinout and connect it for flashing?

Use the pads on the back side of the board: 3.3V, BT (bootloader), RX1, TX1, and GND are the only connections needed for flashing [#20102439] BT means the bootloader/boot pin, and the UART lines must be crossed: board RX goes to USB-UART TX, and board TX goes to USB-UART RX [#20102808] Power it from 3.3V only, because 5V on the 3.3V pin can burn the BL602 [#20102808] To avoid misreading the footprint, align the pinout image with the dot mark on the module, since that marks the first pin [#20103128] The reply also points to a BL602 flashing guide for the full procedure [#20102439]
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  • #31 21792340
    tadeu1
    Level 5  
    I'm with my baby right now. 10 days :-) I'll do later. Thanks for now, you guys are awesome.

    Added after 58 [minutes]:

    Perfect, the button is working right now, I'll leaving something to check if I an meter the energy
    Tasmota configuration screen with GPIO settings for BL602 ESP MOD


    For now to replace the BL602 to ESP-02S
    the energy meter its not working yet
    {"NAME":"BL602 ESP MOD","GPIO":[0,32,2720,0,0,0,0,0,2592,320,224,2656,0,0],"FLAG":0,"BASE":18}

    Added after 1 [hours] 27 [minutes]:

    >>21792161

    its weird because its say
    GPIO2 = Primary output channel (channel0_pin) – relay
    its gpio15 on esp8266 but the relay just wokr on GPIO14

    its ok:
    GPIO20 = Channel / relay indicator LED (channel0_led_pin)
    GPIO17 = Primary button input (key0_pin)

    I'm based on this map
    GPIO pin mapping table for BL602 and ESP8266 modules with functions and colors
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  • Helpful post
    #32 21793011
    divadiow
    Level 38  
    >>21792093

    boot log from this dump

    Code: Text
    Log in, to see the code
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  • #33 21793356
    tadeu1
    Level 5  
    I figured out now.
    Just need to calibrate the energy meter sensor.

    {"NAME":"BL602 ESP MOD","GPIO":[0,32,0,0,2720,2656,0,0,2624,320,224,0,0,0],"FLAG":0,"BASE":18}


    Tasmota interface screen showing energy usage data and device status ON

    GPIO configuration for BL602 ESP MOD device in Tasmota interface

    you have to go to the console and set
    I use a light 15w for example for calibration

    VoltageSet 213 (example)
    PowerSet 15.0 (example)
    CurrentSet 70 (0,070A)

    also SetOption21 1 to show voltage when is off

    Tasmota dashboard showing voltage, current, and energy consumption data
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  • #34 21793421
    p.kaczmarek2
    Moderator Smart Home  
    It's worth to mention that you need to connect a known, measured load first, and then enter calibration values. Beginners may be reading our threads.

    So, good job, is it fully functional now?
    Helpful post? Buy me a coffee.
  • #35 21793429
    tadeu1
    Level 5  
    Yeah, it's working right now. It's weird because the map from BL602 to ESP GPIO won't match. I have to try each one.
    Yeah, you all right about the calibration. I use a 15 W light to do that. Thanks a lot, guys, for your support.
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Topic summary

✨ The discussion focuses on identifying the pinout layout and flashing procedure for a BL602-based IoT lamp breakout board, specifically an E27 smart lamp holder using the SM-028_V1.3 module. Key pins required for flashing include 3.3V power, GND, Boot (BT), RX, and TX. The RX and TX pins on the board must be cross-connected to the TX and RX of a USB-to-UART converter, respectively, with caution to use a 3.3V power supply to avoid damaging the BL602 chip. The board’s pin labels such as 22, 17, C, and W correspond to RGB and white LED channels (C = cool white, W = warm white), while other pins like 14 and 20 are associated with button and relay functions. Pin identification can be aided by aligning the chip’s pinout diagram with the board’s dot mark and using reference images. Additional resources and guides are available in linked forum topics for detailed flashing instructions and device information.
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FAQ

TL;DR: Need to flash a BL602 lamp board? Its factory boot log shows 6 partitions, and “BT = BooT = Bootloader.” Power at 3.3V, cross RX/TX, and use the rear BT pad to enter flashing mode. [Elektroda, divadiow, post #21305303]

Why it matters: This FAQ helps newcomers quickly identify pins and safely flash the SM-028_V1.3 BL602 lamp holder without guesswork.

Quick Facts

Which pads do I actually need to flash the BL602 lamp board?

Use five pads on the back: 3.3V, GND, RX1, TX1, and BT (bootloader). That’s sufficient for flashing. [Elektroda, p.kaczmarek2, post #20102439]

Which pad is the bootloader pin on this board?

The bootloader pad is labeled BT. As the expert put it, “BT = BooT = Bootloader.” Hold it appropriately during flashing. [Elektroda, p.kaczmarek2, post #20102808]

How do I wire RX and TX to my USB‑to‑UART adapter?

Connect board RX to adapter TX and board TX to adapter RX. If the board uses non‑standard labels, swap them. [Elektroda, p.kaczmarek2, post #20102808]

Is there a clear, step‑by‑step flashing guide I can follow?

Yes. Follow the author’s BL602 flashing guide linked in the thread; it covers pads, wiring, and tool usage. [Elektroda, p.kaczmarek2, post #20102439]

How do I orient the pinout when tracing pads on an unknown module?

Match the chip’s dot mark (pin‑1) to the pinout image, then trace the pads from that reference. [Elektroda, p.kaczmarek2, post #20103128]

Which module is inside the E27 AC90‑250V smart lamp holder, and what GPIOs matter?

It uses the SM-028_V1.3 BL602 module. Typical assigns: P14=Button, P20=Relay, P22=Wi‑Fi LED. [Elektroda, divadiow, post #21305303]

What useful data can I read from the boot log?

You’ll see partition count, flash geometry, and UART speed. Example: 6 partitions and 2,000,000‑baud UART. [Elektroda, divadiow, post #21305303]

Can I enter bootloader mode without soldering directly to the microchip?

Yes. Use the exposed rear pads, especially BT, RX1, TX1, 3.3V, and GND, to avoid chip‑level soldering. [Elektroda, p.kaczmarek2, post #20102439]

My blue LED flashes until Wi‑Fi connects; is that expected on this module?

Yes. Template notes show WifiLED on P22. The blue LED flashes until connection, then turns off. [Elektroda, divadiow, post #21305303]

The red LED turns on with the relay; is that normal?

Yes. Reports show the red LED tracks the relay state, indicating the socket is live when ON. [Elektroda, divadiow, post #21305303]

Quick 3‑step: how do I flash this board safely?

  1. Wire 3.3V and GND; cross RX/TX; connect BT.
  2. Enter boot mode per the guide; open your flasher.
  3. Flash firmware; power‑cycle and verify serial log at 2,000,000 baud. [Elektroda, p.kaczmarek2, post #20102439]
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