├── README.md
└── moisture.yaml


/README.md:
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 1 | # Capacitive-Soil-Sensor
 2 | This is a setup to use multiple capacitive soil sensors with one ESP8266 utilizing the great ESPHome library. Eventually this will will have 3D printed design files as well to enclose and waterproof the capacitive soil sensors and the ESP8266. 
 3 | 
 4 | Here are the sensors I am using:
 5 | https://www.aliexpress.com/item/10pcs-Capacitive-soil-moisture-sensor-not-easy-to-corrode-wide-voltage-wire-for-arduino/32859931034.html?spm=a2g0s.9042311.0.0.36424c4dca4OGe
 6 | 
 7 | I am using this Wemos D1 Mini Lite to read the sensor values:
 8 | https://smile.amazon.com/gp/product/B07BK435ZW/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
 9 | 
10 | Connect all of the sensors ground wires to ground, and connect all the analog outputs from each sensor to the same ADC pin. The positive wire on each sensor should go to its own GPIO on the ESP8266.
11 | 
12 | Some notes for parts I will use in this project:
13 | 
14 | I am going to use these connectors to make each sensor able to disconnect from a long cord, yet still stand up to outside weather
15 | https://smile.amazon.com/gp/product/B071NCK9WW/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1
16 | 
17 | I am going to use this AC to DC converter to power the Wemos
18 | https://smile.amazon.com/gp/product/B076K8HT8Z/ref=ppx_yo_dt_b_asin_title_o09_s00?ie=UTF8&psc=1
19 | 


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/moisture.yaml:
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 1 | esphome:
 2 |   name: wemos_moisture
 3 |   platform: ESP8266
 4 |   board: d1_mini_lite
 5 |   on_boot:
 6 |     then: # This ensures no sensors are getting power
 7 |       - output.turn_off: plant1Output
 8 |       - output.turn_off: plant2Output
 9 | 
10 | wifi:
11 |   ssid: !secret ssid
12 |   password: !secret wifi_password
13 | 
14 | api:
15 | 
16 | logger:
17 | 
18 | ota:
19 | 
20 | # These define the GPIO that are hooked up to the positive pin on the individual sensors
21 | output:
22 |   - platform: gpio
23 |     pin: D0
24 |     id: plant1Output
25 |   - platform: gpio
26 |     pin: D1
27 |     id: plant2Output
28 | 
29 | 
30 | # Dry 0.7 - taken from in the air, probably should do it directly in dry soil
31 | # Wet 0.264 - taken from in a glass of water, probably should do it directly in saturated soil
32 | sensor:
33 | # This is the actual reading of the various sensors
34 |   - platform: adc 
35 |     pin: A0
36 |     id: moisture
37 |     update_interval: 0.1s
38 |     internal: true # Don't expose this sensor to HA, the template sensors will do that
39 |     accuracy_decimals: 1
40 |     filters:
41 |       - sliding_window_moving_average: # averages the last 10 results, probably overkill
42 |           window_size: 10
43 |           send_every: 10
44 |       - lambda: |-
45 |           if (x > 0.7) { 				// if over 0.7 volts, we are dry
46 |             return 0;
47 |           } else if (x < 0.264) { 			// if under 0.264 volts, we are fully saturated
48 |             return 100;
49 |           } else {
50 |             return (0.7-x) / (0.7-0.264) * 100.0; 	// use a linear fit for any values in between
51 |           }
52 | # actual sensors reported to Home Assistant, pull the value from the internal ADC sensor
53 |   - platform: template
54 |     name: "Plant 1 Soil Saturation"
55 |     id: plant1
56 |     unit_of_measurement: "% Saturation"
57 |     icon: "mdi:water-percent"
58 |     update_interval: never
59 |     accuracy_decimals: 0
60 |     lambda: |-
61 |       return id(moisture).state;
62 |   - platform: template
63 |     name: "Plant 2 Soil Saturation"
64 |     id: plant2
65 |     unit_of_measurement: "% Saturation"
66 |     icon: "mdi:water-percent"
67 |     update_interval: never
68 |     accuracy_decimals: 0
69 |     lambda: |-
70 |       return id(moisture).state;
71 | 
72 | # This is the code that runs over and over again turning on the correct sensors then updating the template sensors
73 | interval:
74 |   - interval: 15s # if you add more outputs, increase this time as appropriate
75 |     then:
76 |       - output.turn_on: plant1Output # turn on sensor 1
77 |       - delay: 5s # let sensor 1's reading settle
78 |       - component.update: plant1 # update sensor 1's reading in HA
79 |       - output.turn_off: plant1Output # stop powering sensor 1
80 |       - output.turn_on: plant2Output # turn on sensor 2
81 |       - delay: 5s # let sensor 2's reading settle
82 |       - component.update: plant2 # update sensor 2's reading in HA
83 |       - output.turn_off: plant2Output # stop powering sensor 2


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