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24 Results for "ULN2803A"

  • Building The Board

  • Intro: This is the fun part of most things I do, building the PCB. I used Eagle CAD 7.6.0 for my PCB design because hey, I have a license and I know it already. If you have a CAD tool like KiCAD just make sure after importing the files that everything...
  • Raspberry Pi Connection

  • I connected the RasPi with an old floppy IDE cable (cut at one end). It has 8 more pins than the Raspberry Pi, so these are ignored (would be cable ids 27-34).Here is the mapping of RasPi pins to floppy cable ids (only the first 26 of 34 can have a connection):Mapping...
  • MQTT-driven IP-relay module

  • This main components is: - 8 Channel DC 12V Relay Module with ULN2803 driver and 12V to 5V DC-DC converter installed;- STM32F103C8T6 aka Blue Pill module;- Wizchip Ethernet W5500 module;- two 8-dip switches;- prototype printed circuit panel (green colored...
  • Raspberry talking to the relay

  • 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!

  • 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...