I have replaced Chinese made brains of air-source heat pump with my own microcontroller that makes whole system much more efficient even at very cold winter climate. It provides heating to water circulation system inside the house. All hardware and software parts are made open-source. Hardware source: https://www.instructables.com/id/Air-Source-Heat-Pump-Robot-Brain-Implant-Arduino/ Source Code: https://github.com/evaldsurtans/heat-pump-arduino-controller More Robots: http://yellowrobot.xyz/ ... https://www.youtube.com/watch?v=aNQKjjwb-MI

Subscribe to see more inventions. ... https://www.youtube.com/watch?v=rYRq5SbTQSQ

This is a Ardunio based robot that tells you with audible voice if your plant needs a water. Yellow Robot site: http://www.yellowrobot.xyz Instructions: http://www.instructables.com/id/Robot-Minion-Plant-Watering-Robot/ Source on GitHub: https://github.com/evaldsurtans/robot_minion References: http://www.tindie.com Water Me bird: https://www.tindie.com/products/tinkerelectric/water-me-bird Robo Birds on ebay: http://www.ebay.de/itm/GC-Mark-Feldstein-Robin-Moisture-Sensor-Plant-Pal-When-To-Water-Plants-/131821366491?hash=item1eb12a6cdb:g:2z4AAOSw9k5XP1fF http://www.ebay.de/itm/Plant-Pal-Singing-Cardinal-Moisture-Sensor-Alarm-Sings-when-plant-needs-water-/262251363549?hash=item3d0f663cdd:g:c5kAAOSwCypWoBgV Chirp! sensor: https://www.tindie.com/products/miceuz/chirp-plant-watering-alarm/ https://www.tindie.com/products/miceuz/i2c-soil-moisture-sensor/ Green thumb: https://www.tindie.com/products/ProtoArt/greenthumb-wifi-soil-moisture-sensor/ Flower Power: http://www.parrot.com/usa/products/flower-power/ Click and grow: http://www.clickandgrow.com/collections/all-products Lilo: https://www.kickstarter.com/projects/pretapousser/lilo-the-easy-way-to-grow-fresh-herbs-at-home Planty: https://nthing.net/en/planty Niwa: http://getniwa.com/store.html Grove Ecosystem: https://www.kickstarter.com/projects/grove-ecosystem/grove-ecosystem-grow-fresh-food-in-your-home Biopod: http://www.biopod.com/shop/ Tweeting plant: https://www.botanicalls.com/ Traffic lights robot for plants: http://www.instructables.com/id/Plant-Moisture-Alarm/ Robot with emotions for plants: http://www.instructables.com/id/More-Humane-Moisture-sensor/ ... https://www.youtube.com/watch?v=4_Oq1PAKOGk

... https://www.youtube.com/watch?v=dnkVbYnU2Xc