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home offers electronic mechanical plus en es fr a mechanical and opensource scale for remote beehive monitoring robust and affordable easy to use adaptable track honey flow and colony strength improve your beekeeping offers option 1 diy : free you want to do everything yourself? go ahead! you like the idea, but would rather build it your own way? help yourself! you want to share your improvements with others? welcome! you simply like the idea of knowing that you can easily modify or repair whenever you want? we’ve thought of that. all the blueprints, electronic schematics, pcb designs and source code are available on github . all the software used is free and/or open-source. option 2 : we supply the kit, you assemble it 230 € incl. vat scale kit, electronic board, sigfox connectivity module with a 1 year subscription, then 15 €/year incl. vat 200 € incl. vat scale kit, electronic board, wifi connectivity (hotspot available or slave-mode to another scale with sigfox) 170 € incl. vat mechanical kit only gsm option under development (240 € incl. vat complete kit with sim card and a 1 year subscription, then 15 €/year incl. vat) available summer 2018 web site for data consultation and email alerts included option 3 : scale assembled and ready to use 350 € incl. vat scale assembled and ready to use with sigfox connectivity, then 15 €/year incl. vat 320 € incl. vat scale assembled and ready to use with wifi connectivity web site for data consultation and email alerts included gsm option under development orders this project has been quietly maturing for several years. all our prototypes have worked wonderfully. today we are confidently launching our beta programme. woohoo! you will be our very first customers and we are counting on you to tell us about your experiences. above and beyond the standard guarantee that you would expect we are committed to delivering to you any improvements made that arise from the beta programme. we are currently producing 100 kits, we expect to deliver around mid-april 2018. if you are interested then please send us an email at [email protected] indicating your country (for the shipping and handling) and the type of module (none/sigfox/gsm). when we’ll be closer to shipping we’ll send details about payment (wire tranfer). you can verify the sigfox coverage of your hives at sigfox.com or you can let us know their approximate location. under development: gsm module (summer 2018) lora module (depending upon interest shown) sms interrogation electronic connectivity wifi included in every board cheapest option if you have a hotspot accessible user-friendly configuration with a smartphone or laptop master-slave scenario, for sharing a single gsm or sigfox endpoint wifi connection allows future slave modules sigfox (optional) sigfox is a new cellular network dedicated to iot. low bandwidth, low power, long range. best option for battery life if no hotspot subscription cheaper than gsm network coverage complementary with gsm world roll-out in progress gsm (optional) best coverage all around the world possible to interrogate via sms without internet connection autonomy best energy is the one you don’t use… first, highly optimized electronic 100na sleep current motor driving strategy to reduce motor use modulable measurement frequency and data send along the year then we look for the best trade-off between environmental impact, cost, availibility of batteries we managed to achieve a good autonomy with simple alkaline batteries on a 10 years lifecycle, rechargeable battery, li-ion or ni-mh, with or without solar panel as an higher cost and impact aa alkaline batteries are the most available battery all around the world with 3xaa alkaline batteries, we expect 2-5 years autonomy, depending on climate, measurement frequency etc… mechanical original steelyard roman balance we add a motor to put counter-weight in motion an optical endstop detects balance a microcontroller drives the system and send the data why a mechanical scale, and not using load cells? because load cell are not supposed to be under continuous load typical use case implies a tare between each measurement, not possible in hive monitoring scenario a creep phenomen make measurement unstable after some time, this is well documented, that we check on our first prototype mechanical scale is not subject to this phenomen. even if structure creeps, measurement wouldn’t change. https://dipot.ulb.ac.be/dspace/bitstream/2013/146415/1/ram_hbm.pdf “ transducer manufacturers provide only information on the short-time stability like maximum creep after 30 minutes or maximum 1 hour under full load, but appear very reticent to provide figures on the long-term stability of their products…… recording strains over long periods of time without having the opportunity to unload the test specimen or the structure and check zero reference is considered to be one of the most difficult applications of strain-gauges…. ” http://www.analog.com/en/analog-dialogue/articles/a-reference-design-for-weigh-scales.html because we don’t depend on any complicated part that we must outsource on the mechanical part (motor, optical endstop) this makes possible to keep cost low easier to understand what could go wrong and repair diy-ers friendly electronic is much simpler : no analog layer on which measurement quality depends from concept to reality enjeu : intégration sous la ruche unlike steelyard that is suspended, our scale has to intergrate under the hive given the object to weigh (100kg), the expected counter weight (500g), and available space, having a single beam is impossible (1:200, 40cm, primary beam should be 2mm long). here is why a 2 stages design we designed a long lasting, fixable, customisable kit. it’s made of aluminium profiles and laser cut stainless steel, joint by stainless bolts. very few ‘other’ parts, a simple motor, a belt, linear bearing, optical end stop. that’s it. no special skills required for assembly. if you’re able to mount an ikea furniture, you should be fine. the picture doesn’t show modifications that will be on the kit sold : a waterproof case for electronic, and a protection above beams. résultats test example made with a sigfox module: after having placed a hive base, we added a weight a, b, and c, we removed them and put them back in the same order. we get a range of 1325 weights with 3 aa batteries. resolution 6g, precision 30g whatever the load is from 0 to 125kg (documentation of the tests allowing to control linearity and repeatabiliy is under progress) plus forum come chat, ask your questions… here! about us pierre and juan, hacker and beekeeper we live near bordeaux, france our friends (and neighbors) openbeelab “openbeelab is a free and opensource research programme about bees.’ by meeting its founder, pgp, that the idea of mechanical scale was really born. openbeelab propose an alternative electronic, more powerful, base on an embedded linux, compatible with the kit proposed here. openhivemanager beekeeping management website, opensource. when we heard about this project, weight was already there, we just had to integrate automatic post! still french-only, but we have some hope that we could help to internationalize it. pierre beck - juan gonzalez [email protected]

URL analysis for openhivescale.org

http://www.openhivescale.org/index-es
http://www.openhivescale.org/#mechanical-en
http://www.openhivescale.org/#offer-en
http://www.openhivescale.org/index-fr
http://www.openhivescale.org/#electronic-en
http://www.openhivescale.org/#plus-en
http://www.openhivescale.org/#intro-en
http://www.openhivescale.org/forum

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  DNS15.OVH.NET 213.251.188.134

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