Hello,
does someone has a code for the D1 Mini for a rain detection sensor?
Thank you!!
Some stuff here should help. But the bigger issue will be the corrosion on that sensor will render it next to useless after a few weeks in the rain.
yes, but its not the code for a D1
All you have to change is the analogue input pin assignment and the board type.
could you tell me how depending on the connection scheme at the image? that would be great. thank you in advance!!
Just change the lines
pin: GPIOxx
To whatever GPIO pin you have them connected to.
I wonder if you can just hook these up directly as a GPIO binary sensor without the intermediate hardware similar to the door sensor set-up?
For the board type:
esphome:
name: rain-sensor
platform: ESP8266
board: d1_mini
For the pin allocation change this section to use the correct pin for the D1 as per below.
- platform: adc
pin: A0
name: "Rain Sensor"
attenuation: 11db
internal: true
Which should be avoidable by not permanently connecting DC voltage to the sensor but only turning it on when taking a measurement - this and other improvements can be found here 
Hi. Could you finish your project? Can you write your latest working config pls? I would like to make the same rain sensor, but i couldn’t get the right code for it.
My Solution:
esphome:
name: wetterstation
friendly_name: wetterstation
platform: ESP8266
board: d1_mini
logger:
api:
encryption:
key: "xxx"
ota:
password: "xxx"
wifi:
ssid: xxx
password: xxx
domain: ".fritz.box"
ap:
ssid: "Wetterstation Fallback Hotspot"
password: "xxx"
web_server:
local: true
time:
- platform: homeassistant
timezone: Europe/Berlin
id: homeassistant_time
switch:
- platform: restart
name: "Restart Wetterstation"
text_sensor:
- platform: version
name: Wetterstation Version
sensor:
- platform: adc
pin: A0
name: "Regen Wert"
id: RegenWert
internal: true
update_interval: 10s
accuracy_decimals: 1
unit_of_measurement: 'V'
- platform: template
name: "Regen Sensor Volt"
unit_of_measurement: "V"
lambda: return id(RegenWert).state;
update_interval: 10s
binary_sensor:
- platform: gpio
pin:
number: D1
inverted: true
name: "Regensensor"
Regen Sensor Volt:
1V = No Rain
if below 1V than its raining
Regensensor = Rain / No Rain
1 Like
I have rebuilt it, but my sensor reports 0.5v when there is no rain.
So I always have rain. Any idea how I can change this?
Thanks
found my mistake 
What was the problem?
wrong wireing 
Hello
I have the Rainsensor running like the one above.
It works very well.
The only question I have is how to leave the sensor on for a certain time when rain is detected, for example. Could also be a second sensor.
I plan to use the rain sensor for my lawnmower robot, as soon as it rains go into the garage for 3 hours.
I think it’s better if the sensor itself can do this than if I trigger it via an automation. Or do you have any better suggestions.
Thank you
A “delayed_off” should be sufficient for that task
2 Likes
You could do what indeeed said but put that filter on a copy binary sensor if you’d like to keep the original sensor separate.
1 Like
Thank You both!
binary_sensor:
- platform: gpio
id: Regensensor
pin:
number: D1
inverted: true
name: "Regensensor"
- platform: copy
source_id: Regensensor
id: Regensensor_Verzoegert
name: "Regensensor_Verzoegert"
filters:
- delayed_off: 1h
works perfect!
2 Likes
Would you please show me your wiring diagram ?
Thank you!