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Laser cutter, start slicing stuff for under 50 dollars
DIY Stencil for PCBs
Arduino + AD9850 30MHZ DDS Signal Generator In 12$
It generates the functions.
Nice project but I thought instructables.com is for diy instructables not advertising.
The Wooden Light Bulbs
Zip Tie Starlight
Segmented Log Lamp
PCB UV Exposure Unit
How to DIY a Gatling Gun-Style Voice-Controlled Wi-Fi Speaker
Vinyl Sticker PCB - How To
That was incredibly easy, my first "printed" PCB (I've done a lot using nail polish 30 years ago). My printer didn't like high quality photo paper so I printed on newspaper.
DIY Constant current load
Tiny Load - constant current load
ESP8266 Wi fi module explain and connection
It is unclear where the 100 ohm resistor should be. On one of your schematics it's between Arduino RX and BT TX which doesn't make sense as the BT is 3.3V logic level and Arduino is 5V. On the other schematic you connect BT RX to Arduino RX and TX to TX which is a simple mistake I assume.
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