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?
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?
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?
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?