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  • Open Indirect Ophthalmoscope

  • OverviewCurrently there are over 422 million people worldwide suffering from diabetes. 28.5% of them suffer from Diabetic Retinopathy(1) . 50% of diabetics are unaware about the risk of losing their vision(2). The number of cases of diabetic retinopathy...
  • Sensor and Actuator board for AUV

  • https://jlcpcb.com/RATAn autonomous submarine is an extremely versatile tool for simple underwater jobs. Many tasks can be executed in a safer way with robots, sparing life and limb of professional divers that once were the only option. This is now exclusive...
  • BeeStalker UsbLog

  • Some basic keyfacts:2 board design: 1 double sided PowerBoard and a 4 Layer PCB with a Compute Module 3 on itEverything is built do be modular. So you can easily exchange the Powerboard with an 5V regulator, connect your mouse, a keyboard and an USB-Graphics...
  • Nano Fpv Tank Inspection Bot

  • After gutting the tank of its stock control board and replacing with the better receiver, escs and fpv system, I set about designed and 3d printing a new shell to hold everything in. Building this thing was a bit fiddly due to its tiny size, but all...
  • TNS 1i

  • RulesNo strings. We really don't like the string systems.5 volts only. It lasts longer and unify everything to one battery.4 fingers. It just works better and makes a statement, form follows function.Schematic
  • 74xx Discrete Clock

  • Design Principles: * clock with hours, minutes and seconds display, 24h format* 7-segment display to have the nice 70s/80s charm* everything is driven by a single 1Hz clock* everything runs on 5V* use discrete-logic only - no "hidden" AVR or something...
  • Peltier Cloud Chamber

  • Short demo video: ---------- more ---------- For this I took a single TEC2-25408 Peltier element, which sits on a Thermalright Peerless Assassin 120 CPU air cooler. On the cold side of the Peltier sits a 100 x 100 x 2mm copper plate into which I drilled...
  • Coffee machine v2

  • This coffee machine is by now up and running for about 1.5 years. I started documenting and open sourcing everything offline; this month's Hackaday Prize was the motive to speed things up a bit and put it online. Project logs will follow...In the project...
  • 192:LED redesign

  • Compared to the original #192:LED design. Nearly everything did changesmaller: 15.8mm x 14.6mmNo complicated Multiplexing anymore! LEDs are WS2812 style ones in a metric 1515 packagesmarter: MCU is a SAMD21USB: quite more convienat and easier to...
  • Ratch

  • Ratch Aurora has got a color sharp memory display with a backlight. A LSM6DSOX IMU for motion tracking. NOR flash to store apps. A vibration motor for notifications and a Lipo battery. Its got 4 buttons called up, down, select and back. Everything is...
  • Nixius

  • You can get the detailed bill of materials on github. But basically you will need:4 IN-1 Nixie tubes STM32F051R4T6 ARM Micro DHT22 temperature sensor if you want temperature display 30 FMMTA42 transistors that are used to drive the Nixies - so no special...
  • Portable Stereo Speaker

  • The amplifier is based on 2x2 LM380N-8 that gave a pretty sound on the first tests. Stereo circuit is also doing well, look at the scheme attached to see how I built the whole thing.It needs a 12V voltage supply and give back a 2.5W output power. I linked...
  • Peercoin Minting Station

  • Requirements To start and designing such product is to understand how Peercoin algorithm work : everything is well explained here https://university.peercoin.net and here https://www.peercoin.net/wallet to download wallet on your machine...