Yeah, I've thought about it. The idea with this device is not as much creating something that can be used all the time by the students, but creating an alternative open-source DIY (and cheaper) replacement for the expensive dataloggers that teachers can (when they are lucky) use for didactical purposes. This device does not intend to replace the use of arduino-based systems, mobile phones, tablets or other electronic alternatives in the classroom, i see it as a tool for supporting the others. Already with the powerbank, the touchscreen and the raspberry pi we are over 100 € or 85 £. If you make it times 20 or 25 for every student it is just totally out of budget for any school. And it is also just too much compared with small dataloggers made with arduino that are more resistent and can cost only one tenth of what this device can cost. So trying to go in that direction would be a nonsense.bensimmo said:
A few challenges you may want to think about (given this is something I do at work in school science).
They'll get dropped.
They will get splashed with water and or weak acid/base.
If it is not easy to use and with little effort, it will not be used (teachers just will ignore them).
mtormo wrote:bensimmo I will definitely try it. I guess i will not include it in my master thesis, it is already far beyond the scope of the thesis, but my idea is to keep developing the device, as a long term project. About the connectors i don't now yet. For most of the sensors some circuitry is required so my plan is to choose a standard connector, make myself the PCBs, soldering it and build a case with a 3D printer. I've thought as a first step using pre-crimped jumper wires attached to crimp connector housings as a provisional solution while i look for something definitive.
skspurling, i thought exactly the same. I want anyway to make it as compact as possible so teachers interested in using it that have no clue or no interest at all in electronics are not overwhelmed, but flexible enough so interested teachers can make it apart, add sensors or improve the ones that are already prepared.
Gerhard, wow I didn't think about it. My plan was not comercializing it, but offer it to anyone interested. But now that i think about it, it would be also great testing it properly and check that meets the required standards and that it has multilanguage support and documentation etc. I still don't see it as something i could sell, but as something that everybody can build themselves with the proper instructions and documentation
OMG The D100059 looks amazing!! It is unfortunately to expensive for me. I'm checking the other one you wrote down and it could also be an option. I have already ordered itbensimmo wrote:Motion and Position sensor is an option for a mechanical pendulum, there may be cheaper options though as the part in this http://www.logitworld.com/index.php/sec ... ion-sensor is quite expensive.
(I have one of them and the old logger they used to make it can attach to, I have written the part down somewhere, but basically a low friction 360degree rotary resistor)
EDIT quick search and I see they do a digital hall one, can't remeber if that used these but maybe an idea https://www.aliexpress.com/store/produc ... 85996.html
I'm using the MCP3008 for that. I don't know if it is actually a good option but so far is doing very well its job. I would love also to try the Adafruit ADS1115 but that will need to wait until my Master thesis is done.skspurling wrote:
Maybe some sort of HAT with standard digital and analog input and output connectors? If you are doing analog measurements, you will want an I2C ADC chip (Pretty common) on the board.
I am unfortunately still far from that. My programming skills need to improved a lot until i can do that . At the end i am just a physics teacher who loves electronics But anyway, I would love to make my own Hat. That would be so great! By the way, I have been thinking about a proper name for the Project and i have decided that i want to call Peach Pi (Physics tEACHing with Raspberry PI)skspurling wrote:Then you write a short library that can query the different channels. On each I/O, you will want a power, ground, and signal. Isolate them from the GPIO on the board for safety. That way you can have a mutitude of sensors wired up for the connectors. You could specify the "mtormo" physics board standard, and put it under the GPL or Apache licence as open source hardware. That way you could make some profit off it if you wanted to build and sell some, but other small board and sensor interrogators could also make interchangeable modules to use on the standard. You may want to make a small run or get with someone that might find some interest in building and selling small runs of this type of board system to get it started.
That was exactly my idea when i thought for the first time about itskspurling wrote:That actually sounds exciting to me, but I'm a geek. I'm kind of tired of not having consistent interconnects on stuff, except as an expensive commercial standard or just by accident.
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