MuTech RoboticsLearning Hub
Kids OK with adultArduino NanoLevel 2/3

Smart Plant Watering

A soil sensor reads moisture and a small pump waters the plant through a 3D-printed drip ring, even while you're away.

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Smart Plant Watering
Kids OK, with an adult

DIY project. Children must build this only with an adult (16+ years) beside them at all times. Not suitable for children under 8 years.

Keep the electronics above and away from the water.

Strictly follow the description given with this video.

Video

The video link will be added here soon.

How it works

  1. The capacitive sensor reads soil moisture; the OLED shows it.
  2. Below 35% the pump runs in short bursts until the soil reaches 60%.
  3. Water drips evenly from the printed ring around the stem.
  4. A float switch stops the pump when the tank is empty, so it never runs dry.

Parts you need

  • Arduino Nano₹345× 1Buy
  • Capacitive soil moisture sensor₹57× 1Buy
  • 5V mini submersible pump + 1 m silicone tube× 1Buy
  • Logic-level MOSFET module× 1Buy
  • Float switch× 1Buy
  • 1N4007 diode₹17.2× 1Buy
  • 5V 2A adapter× 1Buy
Kit for this projectPrice on request
Get the kit

Wiring

5V railAdapter+5VGNDGND railSoilAOVCC / GNDNanoA0A4A5D9D2GND5V /GNDOLEDSDASCLVCC / GNDMOSFETSIGIN+IN−OUT+ / OUT−Pump+ / −Across the pump, stripe to+1N4007 diodeFloat switchAB
PowerGroundSignal
#FromConnect to
1 PowerAdapter +5V5V rail
2 GroundAdapter GNDGND rail
3 SignalSoil AONano A0
4 PowerSoil VCC / GND5V / GND
5 SignalOLED SDANano A4
6 SignalOLED SCLNano A5
7 PowerOLED VCC / GND5V / GND
8 SignalMOSFET SIGNano D9
9 PowerMOSFET IN+5V rail
10 GroundMOSFET IN−GND rail
11 PowerMOSFET OUT+ / OUT−Pump + / −
12 Signal1N4007 diodeAcross the pump, stripe to +
13 SignalFloat switch ANano D2 (INPUT_PULLUP)
14 GroundFloat switch BNano GND
A wiring step from the video
A wiring step from the video

3D print files

  • drip_ring.stlPETG · 0.2 mm · 20% · no supports · ~1 h 30 minDownload
  • sensor_stake_pump_clip.stlPETG · 0.2 mm · 30% · no supports · ~1 h 10 minDownload

Code

The tested Arduino / ESP32 code for this project will be posted here, ready to copy.