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Week 16 - Applications and Impplications

aka Hard questions week


For this week we just had to answer a bunch of hard questions. Here they are:

What will it do?

My device, a ferry clock, will tell you in the blink of an eye which ferry is the best to take if you leave now. The clock switches on using a doppler radar when a person approaches it.

Who's done what beforehand?

This is all original work. Altough I did draw design and contruction inspiration from numerous other fab- and maker related projects that I have seen in the last few months.

What will you design?


  • PCB's
  • Casing + wallmount
  • Code
  • Powermanagement

What materials and components will be used?

  • White LED's
  • Acrylic plates
  • RF1 plates
  • solderpaste + solder
  • USB cable wires
  • ESP32
  • various resistors, capacitors, switches and buttons

Where will they come from?

Amount Item + Shop link Price
9 LED COOL WHITE 5000K 80CRI 0,24
1 ESP32-WROOM-32 (8MB) 4,5
9 RES 49.9K OHM 1-4W 1% 1206 SMD 0,10
1 RES 10.0K OHM 1-4W 1% 1206 SMD 0,10
1 CAP CERAMIC 1PF 50V NP0 1206-$0.04200 0,31
2 CAP CERAMIC 1PF 50V NP0 1206-$0.04200 0,28
1 IC REG LDO 3.3V 1A SOT223-3 0,10
1 2 sided FR1 circuit board 1,69 (when buying a 25 pack)
3,56m Recycled Black PLA Filamanet 0,27

The USB cable, Acrylic and screws i found in the lab or in my home. And so should you. The quantities needed are so small that it is better to look for left-overs you can use then to order a whole pane. Also good from a recycling perspective.

If you really want specific colour, try to find a shop that has some samples for you for a small price and use those.

How much will they cost?

Total cost of the project was: €12,63

(+ €6000,- research, making a total of 6012,63)

What parts and systems will be made?

  • The casing; a mostly acrylic casing to hold everything together with
  • holes for light to shine through
  • holes for switches
  • hole for power
  • holes on the back to approach the rx and tx in case of need for programming
  • a 3D printed wall mount plate
  • The boards
  • A double sided PCB with LED's on one side and the radar + esp32 on the other side
  • the electronics

What processes will be used?

  • Lasercutting for the case
  • 3D printing for the wallmount
  • Small milling machine for making the PCB's
  • soldering
  • Arduino IDE for programming

What questions need to be answered

Is this going to be a self-contained project, or is it going to be wired? One he one hand I like the idea that the project can be made and then left to itself. Using a Real Time Clock and hardcoded time table this is real option. Otherwise future spirals would benefit from a flexible more flexible MCU.

How will it be evaluated?

On the basis of successful integration of the above mentioned techniques. Operationability and cleanliness. With that last part I mean that I want my project to be environmentally as clean as possible; not using parts that are not necessary for its function.Also it should of course help me to arrive on time at the ferry from now on.