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How to power the ESP12E NODEmcu V3, dht22 and hx711 from a 6V battery?

Poczatkujacy11 3450 8
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  • #1 16110061
    Poczatkujacy11
    Level 7  
    Hello, I have a problem on how to power my circuit correctly. I want the whole thing to be powered by four batteries giving a total of 6V.
    Using a stabiliser I want to get 5V, with a current of 1A, and feed this to the VIN pin.
    I want to feed the dht22 sensor directly from pin 3V3 of my esp.
    However, I have a problem when it comes to the hx711 module, which also needs to be supplied with 5V. I cannot supply it directly from the esp, so I need an external source. The normal current consumption of the hx711 module is only 1.4mA. Does anyone have any idea how I should connect this?

    How to power the ESP12E NODEmcu V3, dht22 and hx711 from a 6V battery?

    Thank you in advance for your help :)
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  • #2 16110146
    Slawek K.
    Level 35  
    According to the note, this chip can be supplied with 2.6-5.5V, so you can easily connect it under 3.3V from the Nodemcu.
  • #3 16110297
    Poczatkujacy11
    Level 7  
    only the strain gauge bar it will operate is 5-12V :(
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  • #4 16110710
    Slawek K.
    Level 35  
    Then a logic state converter and problem solved. VCC to 5V and the two analogue lines via a 5v->3.3V logic converter or 1:1.5 resistor dividers to the Nodemcu.

    Best regards
  • #5 16110794
    Poczatkujacy11
    Level 7  
    So I can supply power via pin 3v3, but first I have to pass it through the converter to get 5V?
  • #6 16110885
    Anonymous
    Anonymous  
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  • #7 16110931
    Poczatkujacy11
    Level 7  
    Such a thing? Should the stabiliser be where the arrow shows, since up to 20V can be to the vin?

    How to power the ESP12E NODEmcu V3, dht22 and hx711 from a 6V battery?
  • Helpful post
    #8 16110952
    Anonymous
    Anonymous  
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  • #9 16322852
    andlukas
    Level 12  
    hello.
    i will join the topic and ask how to receive data from the hx711 using the esp8266?

    on other microcontrollers SPI works great, but i only found example programs sending data via SPI from esp8266 to slave. Should I maybe generate the clock signal directly, and check the state of the input?
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