Summer is coming, in the heat, the aquarium water quickly evaporates.
These little device check the aquarium water level every ~12hours, and refill if need.
Size: 20x25mm / ~0.8x1 inch
Powered from 5V USB mini.

Step 1: The parts

- A small PCB
- Attiny45 SU (1x)
- BC847 smd transistor (1x)
- Diode smd (1x)
- 3,5mm 1x2 terminal block (2x)
- 100K resistor 0805 (1x)
- USB mini connector (1x)
- G5V1 relay (1x)
- 9-12V brushless water pump (1x)
- 5V adapter (1x)
- 9-12V adapter (1x)
- Some aquarium air tube
- wire for sensors. (im using breadboard cable)

To programming Attiny
- Arduino panel
- 10uF capacitor
- SOP to DIP adapter to programming smd Attiny
<p>Really cool. This maybe a part for my plant growing and watering system. Why you are using the Attiny45 instead of a Attiny85 ? </p>
<p>Attiny45 was in the drawer. :)</p><p>Now in the planning phase my adjustable plant watering system.</p><p>In the next few week i hope done and tested, then upload here too.</p>
<p>Hello. I would be very interested how you achieved your plant watering system - I am considering the same system too. Thank you for uploading your design and your story here. Kind regards. </p>
<p>What sensor did you use for measuring the water level? :)</p>
<p>Im using two pcb pinhead, soldered on the cable.</p><p>No specific sensor need, you can use any wire as sensor.</p>
<p>Nice simple design. Have you thought about using solid state relays instead of mechanical relays?</p>
<p>Thanks. </p><p>Yes, but on this small PCB and for 9-12V devices im using these relays. </p><p>(Cheaper and smaller than SSR).</p><p>When controlling AC device, im usin solid state relay.</p>
<p>KISS) one float valve will do same job, </p><p>two of them in series adds extra safety against overfilling. </p>
<p>Yepp, but that realy nasty in the aquarium, especially in nano. ;)</p><p>The sensors size looks a jumper connector, can hide behind filter tube, in the corner...</p>
Great idea! I really want to learn more about arduino stuff!<br>Your english is fine ;-)

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