Full feature custom PCB prototype service:https://www.pcbway.com/One pcb board for free, for new pcb designers,try it.nokia 5110 lcd display and dht11 to make temp and humidity gadget:https://youtu.be/lpR8hmQY8JAArduino lcd 16x2 display and soil sensor to make watering system:https://create.arduino.cc/projecthub/PatelDarshil/soil-moisture-sensor-with-lcd-display-71d6dfFor DIY Led hourglass i got this info:https://www.reddit.com/r/arduino/comments/5uldig/arduino_hourglass_my_first_finished_project/MQ9 gas sensor experiment video:https://youtu.be/MlNrHiFGRKoISD1820 Sound Voice Recording Playback Module Recorder:https://ebay.to/2WecYxdDid you miss our previous article... https://coolstufftomake.com/gadgets/7-amazing-homemade-gadgets-that-will-blow-your-mind
