How to control many actuators like relays from one Arduino output pin? Use a strip of NeoPixel LEDs with LDRs as self-made optocouplers!
Project tutorial by Pedro52
Many publications exist about moisture sensors for applications, e.g. plant watering systems. Making a DIY Sensor is fun and cost-saving.
A self-made (cheap) water level sensor and water level indicator to measure 5 water levels in a reservoir tank.
I built my own, fully functional claw machine/ crane game!
Project tutorial by -MMM-
A connected universal remote.
Project tutorial by BuddyC
Disassemble an old printer (in this case a dot matrix) and drive the stepper motor(s) for linear motion or rotation. With Arduino.
Hi Eric, excellent inspiring project and so many views and reactions, great!
Thank You!, Good to hear that it can be done on a Mega as well, very useful tip. The stainless steel welding rod is an excellent idea
Dear Stauffski, thank you for your message, indeed I used the strip that I had available and yes you are right, it is the resin that is causing the optical cross-talk. I solved that by reducing the luminance of the LED's (strip.setPixelColor(RelaisNo, RelaisState*15, RelaisState*15, RelaisState*15); and that works perfectly. Using a shift register is another approach, that could be considered depending on the application.
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