farmer

A WiFi-connected plant-watering rig built on an Arduino MKR1000: it reads soil moisture, waters the plant when the soil dries out, logs readings to ThingSpeak, and exposes a web UI plus IFTTT hooks for remote and voice control.

Features

• Auto-watering: pumps for 2 seconds when the smoothed moisture reading drops below a threshold
• Rolling-average smoothing over 10 analog reads to suppress sensor noise
• Logs moisture readings to a ThingSpeak channel every 15 seconds
• IFTTT Webhooks notification when the soil goes dry
• On-board HTTP server with a small web UI for manual pump control and threshold adjustment
• Voice control via IFTTT applets (Siri Shortcuts, Google Assistant) hitting the same webhook

Hardware

• Arduino MKR1000
• Capacitive or resistive soil moisture sensor (analog out)
• 5V electromagnetic relay module
• Small DC water pump
• Grove connectors / shield (optional, for tidy wiring)
• 5V power supply for the pump

Pinout

Pin	Connection
A0	Soil moisture sensor
D4	Relay control (pump)

Threshold defaults to 300. As a rough guide: ~700 is humid soil, ~300 is dry.

Setup

1. Install the Arduino IDE and add board support for the Arduino SAMD Boards package, then select Arduino MKR1000 as the target.

2. Install the required libraries via the Library Manager:

   • WiFi101

3. Create a ThingSpeak channel with one field (field1 = moisture) and copy its Write API Key.

4. Create an IFTTT Webhooks applet with the event name moistureStatus and copy your Webhooks key (from https://maker.ifttt.com/use/<key>).

5. Copy the secrets template and fill in your values:

   cp secrets.h.example secrets.h

   Then edit secrets.h:

   #define SECRET_SSID         "YOUR_WIFI_SSID"
   #define SECRET_PASS         "YOUR_WIFI_PASSWORD"
   #define SECRET_APIKEY       "YOUR_THINGSPEAK_WRITE_API_KEY"
   #define SECRET_IFTTT_APIKEY "YOUR_IFTTT_WEBHOOKS_KEY"

   secrets.h is gitignored.

Build & flash

1. Open main.ino in the Arduino IDE.
2. Confirm the board is set to Arduino MKR1000 and the right serial port is selected.
3. Click Verify, then Upload.
4. Open the Serial Monitor at 9600 baud to see the device's IP address once it joins WiFi.

Usage

Once flashed, the device prints its local IP to serial on every cycle. Visit it in a browser:

http://<device-ip>/

The UI exposes four endpoints:

Endpoint	Action
/A	Toggle pump between auto and manual modes
/B	Water the plant now (2-second pump pulse)
/C	Increase moisture threshold by 25
/D	Decrease moisture threshold by 25

In auto mode, the pump fires whenever the smoothed reading falls below the threshold. In manual mode, it only fires when you hit /B.

Voice control via IFTTT

Wire an IFTTT applet (Siri Shortcut or Google Assistant) to a Webhooks action that GETs your device on the local network, e.g.:

http://<device-ip>/B

Example phrases:

• "Hey Siri, water the plant" -> GET /B
• "Hey Google, set the plant to manual" -> GET /A

For this to work over voice, the device and the phone/assistant must be on the same network (or you need a tunnel / port-forward in front of it).

License

MIT (c) Jeon Wonje