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ESP32 3.3V and 74HC595 and the OMRON G3MB-202P SSR control from 5V?

wachcio 243 3
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  • #1 21885409
    wachcio
    Level 24  
    Posts: 1045
    Help: 61
    Rate: 73
    Hello

    I am building a garden irrigation controller the "heart" of which will be an ESP32 powered by 3.3VDC it will control two 74HC595. About 8 years ago I did something similar on an AVR but there the supply voltage was 5VDC. I have a question about controlling the popular OMRON G3MB-202P SSR relays. In the datasheet I found info that the control voltage for them is min 5VDC. Will the diagram below, which I had in my previous device and still works, also be correct here where the ESP32 pin has 3.3VDC and separately I would give 5VDC to power the SSR?

    ESP32 3.3V and 74HC595 and the OMRON G3MB-202P SSR control from 5V?

    The 24VAC solenoid coils have the following parameters:
    - inrush current 350 mA, holding current 190 mA , 60 HZ
    - inrush current 370 mA, holding current 210 mA , 50 HZ
    There will be 9 of them in the unit and I want to use a TTH0120 toroidal transformer - TS 120VA 230/24V H or 150VA transformer. Will it be suitable?
    I will put a Gretz bridge behind the transformer. Which inverters for 5 and 3.3 VDC to use preferably SMD?
    Or even another idea for controlling solenoid coils based on an optotriac e.g. MOC3021?
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  • #2 21885443
    tos18
    Level 42  
    Posts: 7032
    Help: 1093
    Rate: 1816
    should work.
    transformer ok
    the inverter must be able to withstand a minimum of 42V on the input e.g. R-78HB5.0-0.5L recom or LCW78_05-1.0 gaptec
    what is there to choose from https://www.tme.eu/pl/katalog/przetwornice-dc...71,2029188,2022980,2036169,2036166&page=5

    Link

    Unless it is to be insulated - e.g. SCWN06C-05 mean-well

    I would go from 5V to 3.3V with an LDO linear stabiliser.
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  • #3 21885763
    wachcio
    Level 24  
    Posts: 1045
    Help: 61
    Rate: 73
    The controller will consist of:
    - board with ESP32-S3 N16R8 (wifi enabled, bluetooth disabled)
    - module with ds3231
    - dS18B20 sensor
    - OLED ssd1308
    - approx. 15 leds
    - 2x 74HC595

    I guess a 1A rectifier bridge and 500mA inverter will be enough or also 1A?
  • #4 21885844
    tos18
    Level 42  
    Posts: 7032
    Help: 1093
    Rate: 1816
    esp alone can draw 300mA. 15led connected in parallel is 150mA. It's getting tight.
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