I was recently attending the Intel Developers Forum in San Franscisco as part of my job. In addition to all the tech Intel plans to offer up they also had a large section dedicated to the Maker community. It is interesting to see what was once a nerdy hobby of mine (electronics and programming) is now quite trendy. Here there were many Makers showing off their wares. Intel keen to get into this trend was offering their own versions of open computing platforms based in part on the Arduino community. (If you have at been interested in learning more about programming computers I encourage you to check this out. The community is friendly and the whole thing is much easier to learn than when I was in Junior High. It is relatively cheap and simple to get results.)
So Intel was giving away their Galileo boards which are Arduino compatible. Not being able to resist something free I picked one up with a vague idea that had been bouncing around in my head. I had been contemplating getting an enlarger timer but I do mostly split filter printing and two timers seemed like it would take a lot of room and while RH Designs has a very nice system it is too expensive for my budget. Now of course I had the basis to start another project and as my wife will attest I am not one to shy away from a project. As usual my ideas also get away with themselves and so the scope expanded. So what started out as an enlarger timer expanded...
Some thought had led me to set out what I wanted to have.
- Control of enlarger light for split filter timings.
- Automatic selection of filters (Hard vs Soft).
- Control of a light source for flashing paper.
- Must help with test strips (normal, split filter, and flashing)
- Develop/stop/fix timings
- Audible queues and metronome for timings
- Friendly/Simple user interface.
- Ability to operate it manually.
- Complete override it if the whole thing packs up.
The PartsFor a user interface I decided on a small touch screen LCD from Adafruit. This was the most expensive part of the system have come from America ($45) but I wanted to make sure it was of good quality. I got what I wanted. It is 2.8" and supports a simple one touch interface.
|FET Driver for LEDs|
A small speaker driven from software provides sounds.
|Breadboard that stacks on Arduino (speaker underneath)|
|Touchscreen stacks on top of the breadboard|
(To be Continued.)