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watsy v2

6 months ago 110
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Watering System

This is a simple watering system based on ATTinyX5 MCU.

Note: this project is intended to be powered by a 3xAA battery pack and a CR2032. The MOSFETs used in this project might not be able to dissipate power from voltage-stabilized source - this case was not tested.

The components are

  • Control board (this project)
  • 3V-6V powered DC motor water pump with flyback diode
  • 3V-5V powered capacitive soil moisture sensor with 3V output
  • Normally open momentary switch (SPST NO)
  • ~3V coin cell battery (CR2032)
  • ~4.5V battery (3xAA)
  • Enclosure

More description is on github


schematic v2

pcb v2


ID Name Designator Footprint Quantity
1 ATTinyX5-20SU U1 ATTINY85-20SU-SOIC-8 1
2 Probe CN_P 3P 1
3 IRLML2502TRPBF Q1_1,Q2_1 SOT-23_L2.9-W1.3-P0.95-LS2.4-BR 2
4 IRLML6401TRPBF Q1_2 SOT-23_L2.9-W1.3-P0.95-LS2.4-BR 1
5 0.1uF C1 0805 1
6 1M-10M R1_4,R1_2,R2_2 0805 3
7 1M R3_1 0805 1
8 220 R1_3,R2_1,R1_1 0805 3
9 10k R3_2 0805 1
10 Motor CN_M 2P 1
11 Button CN_B 2P 1
12 Power CN_PWR 2P 1
13 BS-2-1 B1 BATTERY-1 1




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