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My simple and minimalistic calculator with only two buttons

Volos Rakic 26 Jul 2016, 08:26 last edited by

Here is my last project, it was fun and i learned alot. I am school teacher, i started to play with electronic year ago and next year i am planing to teach my students simple electronic with arduino. You can see my project at this link.

attiny85 calculator – 01:43
— Volos Projects
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arduino 119 lcd 5 attiny85 3
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mfalkvidd Mod 26 Jul 2016, 08:53 last edited by

Nice work! Reminds me of this great short story by Isaac Asimov from 1958.
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Advantage of this sensor is fast and easy installing by the non qualified personal. The sensor is designed for large agriculture facility with many greenhouses where is needed to be controlled temperature and humidity, the atmospheric pressure is for control the motor of air inlet and outlet. With help of the sensor installed outside the greenhouse provide information about positive/negative pressure inside the greenhouse. Finlay the software read accurate temp/humid value of the Si7021, and only atmospheric pressure of BMP180, the temperature sensor inside the BMP180 is used only by the sensor itself to provide accurate atmospheric pressure measurements. The sensor can be used also for home automation, and drone applications where is needed correction of the UAV barometric sensor compared to the ground barometric sensor, also humidity measurement can help the pilot to calculate more accurate flying time.
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Really interesting, maybe I could build something cool around the Arduino HeatpumpIR (https://github.com/ToniA/arduino-heatpumpir) library I've been building. Right now I'm integrating it with Domoticz (http://www.domoticz.com/forum/viewtopic.php?f=34&t=7179#p69647). I'm an ex-Microsoft employee from Finland (resigned about a month ago).
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26 May 2020, 08:43

@GLAB No worries, was in a similar situation.. My perspective was on what the Node could be made to provide, not what could be done within Domoticz to address the requirement - eg Had heard of Dummy counters but had no experience nor understood their purpose, nor had ever used scripts. I had been sending a logical ON/OFF as well as a cumulative total from the Node and hit the same hair-pulling scenario as yourself. Now only the ON/OFF is sent and the short script makes the transposition within Domoticz to a dummy meter (I think kWhr) using the internal clock in Domoticz. Have fun
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@BulldogLowell Yes, all is working, thanks. If you want to use this code for reference it is fully functional.
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Think that would be @CORTEX-Systems I'm also curious.
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@nono8223 I think it will be a good idea as long as there are people actively developing & supporting the platform now and in the future. Recently the Raspberry Pi port (or Linux, in general) has been updated and included in the core library, so MySensors is no longer Arduino-only.
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@hek Thanks for the comments. Sounds good. I'll report back when I have some progress.
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@fets So far, I have only built the 5x5 board (but the others should be schematically identical). The only issue I have found so far is that I cannot get the ISP port to work. But I have checked and I have an identical setup on the 1.0 board and that worked, so I suspect the programmer is too weak to drive the net on this one. So it is not a board-issue per se, and might only be an issue on the 5x5 board as routing is the most complex on that one due to the size.

My simple and minimalistic calculator with only two buttons

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My simple and minimalistic calculator with only two buttons

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