Solid state relay SSR-40DA - D1 Mini not starting

ESPHome
1

Hi everybody,

I want to use my Wemos D1 Mini to control a water valve by switching it with a relay. As the pump needs about 1000W of power I wanted to use the SSR-40DA I already had at home.
This is the code I use to define the relay:

switch:
  - platform: gpio
    pin: D4
    id: valve_1
    name: "Valve 1"
    icon: "mdi:gate"

And this is how I connected it:

relay - → D1mini GND
relay + → D1mini pin D4

Code is validated and I can install it to my D1 mini, but afterwards it does not start when the relay is connected.
If I disconnect the relay the D1mini is starting and showing as “online” on ESPHome.

Cannot find out what’s the problem here, the SSR-40DA can be switched with 3-32VDA, and the D1mini can send 3,3V on D4.

2

D4 HIGH at boot
connected to on-board LED, boot fails if pulled LOW

3

Hi pepe59,

thanks for your reply, but does not change anything. Both PINs work when another relay is connected, but D1mini won’t boot when I use the SSR-40DA.
Booting first and connecting SSR-40DA will work, very strange.

To be clear:
with this relay the Arduino can boot:
relay-33v

and with this it can not:

relay-ssr-40da
relay-ssr-40da1600×1600 115 KB

4

Have you tried a different GPIO pin?
For example D1

switch:
  - platform: gpio
    name: "Valve 1"
    pin: GPIO5
    id: valve_1
    inverted: True
    restore_mode: RESTORE_DEFAULT_OFF
5

Ok, tried with D1 now, and it’s working. D0 also.
D4 and D3 did not, very strange.

Anyway, thanks for your help!!!