David and me dropped by Darja’s place today to contemplate her work on the perfusion project.
And yeah!, they (Darja and her boyfriend) made a nice construction. It works like a charm except that the sensor is missing ! The pump is silent, and a little bit too powerful.
Well we’ve been very busy all of us theses weeks.
We decided to meet again at the lab, and this time we wanted to make it work! (sort of).
We chose to work on the project perfusion, the first project.
Project 1, Perfusion
Automatic watering for the poor plant. Maybe only mechanically.
Darja is very busy and sometimes she canâ€™t water her plant for days. This is a project to keep the plant in a better shape.
I built a little circuit for a relay on the “high voltage” alternate power from the wall plug (230v).
The purpose of this relay is to switch on and off a pump to water the plant.
The circuit is made so that it fits the arduino shield provided with the homesense kit.
Darja can simply set the output digital pin to switch it.
For the time being, Darja will write a piece of code to turn on the pump a certain number of times everyday.
During our next session, I will build a moisture sensor that will water the plant only when it needs it.
Darja dropped by the lab this time.
I worked on the led matrix and it was almost blinking…
So we decided, all together, that it’s not a good project. And we abandoned it, at least for the moment.
The reasons are the following :
– The matrix isn’t sold anymore
– It’s a lot of code and Darja isn’t very experienced in programming
– It’s a lot of wires for a little home
– It fulfills the fourth rule of the cult of done manifesto
Well, I made a replacement in aluminium for the acrylic idle wheel of my makerbot.
After breaking two acrylic wheel, I decided to change the last “weak” part (cross finger).
I don’t have easy access to a lathe or CNC (for the moment, cross finger), so I decided to re-use my punk skills on doing hardware.
Actually, it worked pretty well.
1. draw two circles that correspond to this thing on a 5mm aluminium plate
2. drill the center with the biggest drill you have (12mm in my case)
3. use a half round ring file to expend the ring to your drawing (a Dremel to speed up)
4. cut the external ring using a jigsaw, goggles and safety gloves
5. reduce the external ring using a sand paper/grinder ribbon
6. paste the ball bearing in you piece of aluminium using a good glue (loctite)
7. insert a long M8 screw in the ball bearing and make is turn on the sand paper ribbon with an angle of 45Â°. After few turns, the piece should be round enough and well centered.
Paul drop by the workshop with two bikes, to solder them together in one bike.
He did it very fast and the result is really funny.
I loved seeing someone so interested by getting a result, doing fast and experiencing its accomplishment right away.
Some work still is required, but yeah, it’s already ridable !
Theo, Julien and myself went to the arduino workshop organised by the guys at post tenebras labs.
The workshop was interesting and fun. It’s always nice to meet fellow geeks : )
Hope we will have another occasion to get together and work on some cool projects.