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30 Results for "ULN2803A"

  • Raspberry talking to the relay
  • Log     from Sous Vide cooker and more
  • Since the Raspberry GPIO only support 3.3V and the Sainsmart relay module need 5V to switch the relay I used a ULN2803A and an external power supply (the same I use to power the Raspberry PI, since it supports more then enough amps) to operate the optical...

  • V2.1 is on the horizon!
  • Log     from ZTO-80 Computer System
  • Recently, I have been putting my full focus of the project on designing and refining the SBC V2.1. I have some great new features on it while keeping the PCB just about the same size. The largest of the additions is likely the new expansion bus, which...

  • Testing v3.0
  • Log     from ZTO-80 Computer System
  • Hi everyone, Over the past couple of weeks, I've been working hard to test all of the features of the SBC v3.0. When I first plugged in the board to test it after soldering, I was sad to find that it did not work immediately, which I had hoped it would....

  • Flipdot prototype BOM
  • Log     from Flip-Dot Display & DIY Controller
  • With the PCB on their way and expected to arrive next week, it was time to order the components required for the assembly. Here is a table with the references used, quantity and unit price (for ONE display). DescriptionReferenceQuan-tityUnit PriceTotal...

  • OpenSpa
  • Details     from OpenSpa
  • The controller had these requirements: 24V to 5V and 3.3V regulatorInterface for the original Balboa display8 relay outputsMain (power to the other relays, should one stick then this relay can turn everything off)HeaterCirculation PumpJet Pump 1 - LowJet...

  • 0x04 NTTF - a matrix controller
  • Hacker page     by davedarko
  • CHANGE LOG2015-02-17 Joined with update page2015-02-14 first versionINTRODUCTIONSo I designed a circuit, without making a pcb and sending it to OSHPark today. First I want to make sure, if what I've done is correct or not and right now I'm too confused...

  • Prototype
  • Log     from IoT RGB Led Cube 4x4x4 with Bluetooth
  • This was originally published on my blog: chris-labs.deThis is the second part of my RGB-Cube series (here's the first) which describes my process of forming an idea to a working prototype. After spending hours of reading and ordering the first parts...

  • Clock Clock Clone
  • Details     from Clock Clock Clone
  • MotorsI may be a mechanical engineer, but I don't relish the idea of designing and fabricating the clockwork mechanisms to accommodate 48 separate motors. Fortunately, the automotive industry has faced exactly this situation, and so they produce a dual...

  • PCB components
  • Log     from Microfluidics control system
  • Now that we know what pneumatic components and microcontroller we are using, let's go over how to interface the two. The solenoid valves are controlled individually: apply 12V to power them on; open the circuit to shut them off (or vice-versa, for...
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