Sonoff SV - what are the other GPIO pins for?

Hardware
1

Hi all

I’ve been expanding my collection of connected devices and am now playing around with the Sonoff SV.
Thanks to the incredible guidance by this community I’ve been able to connect it to a switch and a sensor on GPIO14 (like in the famous DrZZs garage video)

My question is about the rest of those pins. The SV has 9 GPIO pins. I’m assuming 4 of those are the 3.3V, RX, TX, and ground pins. One is GPIO14. What are the other for?

Is there a way to connect more sensors to the rest of the pins? Like is there a GPIO13 and GPIO7 that I could connect more reed switches to?

Thanks for all the help!

2

Of those 9 pins, 3 are GPIO (Signal), 3 are power (Vcc), and 3 are Ground. Labelled S, V and G respectively on the board.

Screen-Shot-2019-02-18-at-12.28.37-PM-1

GPIO4, 5 and 14 are the only 3 GPIO pins you have available:

dce01ceb9819552d4e295ae5f57f62aff115720f_2_456x499

3

Tom, looks like you are my champion. Thanks for this too.

That makes a lot of sense. Can you recommend a place where I can read more in how to use GPIO4 & 5 in the same way as 14? I’m not bad at Googling, but couldn’t really find anything. Can I just assign Switch3 and Switch 4 to GPIO4 and 5?

The board is on Tasmota 8.3.1

4

Yes indeed you can. Both those pins have no special caveats. Here’s a handy table that tells you the best pins to use and it looks like Sonoff chose wisely:

Screenshot_2020-06-18 ESP8266 Pinout Reference Which GPIO pins should you use Random Nerd Tutorials
Screenshot_2020-06-18 ESP8266 Pinout Reference Which GPIO pins should you use Random Nerd Tutorials831×777 45.7 KB

1 Like
5

Hi all - I’m wondering if anybody knows what these are?

I want to add additional LEDs for the power and status LEDs and a button all external to a case my SV is sitting in.

The button I could solder but the LEDs are tiny and all I’ll end up doing is butchering the board!

image

6

Hi

You have three GPIOs there that you can assign for different uses… as you say, could be an LED but more commonly used for sensors or other devices.

I use these SVs with temperature (18DS20) and humidity (various) as well as mains power measurement (home consumption).

The block of pins provides three GPIO, three power and three ground.

Hope that helps.

David

7

Thank you for the info …

I just want to confirm that we are talking about the same pins. The block of 9 pins (3x3) I get - it’s the other 9 that I’m curious about. Actually, they are not pins but a header (is that the right word?!). I’m curious about the ones I’ve more carefully highlighted here.

image

image

8

Hi MJ,
Did you ever find out what the row of headers are?
Do you happen to know what pin the relay is?
Adrian

9

No - That row of 9 holes remains a mystery.

Just checked and there are traces from there so somebody with a little more PCB smarts than me could probably tell.

image
image441×521 75.7 KB

GPIO12 is the relay and red led pin - info from here:

10

I’m not sure if you are using ESPHome but if so, this config is working for the green power indicator LED and the relay with it’s associated red LED.

esphome:
  name: driveway_gate_monitor
  platform: ESP8266
  board: esp01_1m

wifi:
  ssid: "xyz"
  password: "abc123"

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Driveway Gate Monitor"
    password: "Bx3SLUgNuBZx"

captive_portal:

# Enable logging
logger:

# Enable Home Assistant API
api:

ota:

binary_sensor:
  - platform: gpio
    pin:
      number: GPIO5
      mode: INPUT_PULLUP
      inverted: True
    name: "Driveway gate monitor"
    device_class: door

switch:
  - platform: gpio
    name: "Status LED"
    pin: GPIO13
    inverted: true
    restore_mode: ALWAYS_ON
    
  - platform: gpio
    name: "Relay LED"
    pin: GPIO12
    restore_mode: ALWAYS_OFF
1 Like
11

i also want to know

12

You are the one with the board. Trace them out.