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[Solved] Powering 20 ESP8266 modules at once with one cable - how to do it?

filipdudek29 582 5
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  • #1 21133483
    filipdudek29
    Level 2  
    By powering the esp8266 using usb, I can power a maximum of 6 such modules. However, I need to power as many as 20, and I don't know how it would be possible to power 20 boards at once with one cable.
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    #2 21133802
    Slawek K.
    Level 35  
    What exactly are the esp8266 modules ? if it is a D1 Mini, you have a 5V pin and supply power to it from an external power supply and not from USB. You need to anticipate about 0.3A per module, as this is how much it can take in peak for WiFi. So if you have 20 modules, you will need a power supply of at least 6A 5V.

    Best regards
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  • #3 21134446
    JacekCz
    Level 42  
    Slawek K. wrote:
    That is, if you have 20 modules, you need a minimum 6A 5V power supply.


    Significant current, there will be voltage drops "in transit"
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  • #4 21134935
    filipdudek29
    Level 2  
    >>21133802 Specifically, the ESP8266 NodeMCU V3
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    #5 21135209
    Slawek K.
    Level 35  
    Ok, so you have two possibilities, either you apply 7-12V to the VIN pin or you apply 5V to the VU pin.

    NodeMCU V3 board schematic with labeled pins. .
  • #6 21135575
    filipdudek29
    Level 2  
    Powering 20 modules using a 10A 5V power supply.
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