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Michael Kohn

@mikeakohn.bsky.social

Software and electronics hobbyist and St. Louis Battlehawks fan. https://www.mikekohn.net/

181 Followers  |  94 Following  |  41 Posts  |  Joined: 17.11.2024  |  1.7009

Latest posts by mikeakohn.bsky.social on Bluesky

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Edible MIDI Keyboard:

This is a musical MIDI keyboard with Kit Kat candy for keys. Longer video and more info here:
www.mikekohn.net/micro/edible...

12.10.2025 20:13 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Two computers networked using lasers by using Linux's tunnel feature, a user land program that listens to the tun0 device, USB-UART cables, and an Atmel ATtiny85. The UARTs run at 2400 baud. More info here:

www.mikekohn.net/micro/ip_ove...

28.09.2025 23:01 β€” πŸ‘ 5    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Further progress on my latest FPGA project. This shows HDMI output with some Atari 2600 looking image and some sprites animating.

25.09.2025 16:34 β€” πŸ‘ 6    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Guitar hooked up to an #ESP32 microcontroller. The ESP32 converts frequency to a MIDI note and sends it to a computer over a UART cable.

More Info:
www.mikekohn.net/micro/guitar...

10.08.2025 14:46 β€” πŸ‘ 4    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Here's some of Post-it Note artwork I made.

27.06.2025 16:02 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
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Just got this tape player so I can make mix tapes for my friends. Or maybe not... have an idea for a weird project to try...

19.06.2025 14:50 β€” πŸ‘ 3    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0
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Got a pin from the St. Louis Battlehawks for being a season ticket holder. Looking forward to the next season of the UFL!

11.06.2025 16:49 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Here's a Mandelbrot generated by code written in PDP-11 assembly language. The software is assembled by naken_asm and the PDP-11 core is running in an FPGA. I'm hoping to expand it to a bigger project later...

07.06.2025 15:24 β€” πŸ‘ 4    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Instead of a standard root beer float, here's a (non-alcoholic) beer float with strawberry shortcake ice cream.

06.06.2025 21:12 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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The past couple days of BlueSky has given me a craving for chicken TACOs. So made a couple for breakfast...

31.05.2025 14:52 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Race Track For RC Car
YouTube video by Mike Kohn Race Track For RC Car

RC Car Race Track: An ESP32 times how fast the car crosses the laser beam and displays the results on a 4 line LCD display. Included is an ATtiny85 based racing light tree.

www.youtube.com/watch?v=FCKg...

15.05.2025 09:15 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Mini Golf Circuit
YouTube video by Mike Kohn Mini Golf Circuit

Here's a mini-golf circuit made from two ESP32's that talk over WiFi. An RFID tag in 3 different balls know which player is hitting and a NanoBeacon from @sparkfun.bsky.social in each ball broadcast data from 3 axis accelerometers for a hit count.

www.youtube.com/watch?v=_FQi...

14.05.2025 13:26 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Caught this feral cat taking a nap on my deck the other day.

28.04.2025 00:55 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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They handed out towels at the #Battlehawks game last night. I guess that's why I feel like signing up for Verizon Business now. Three more #UFL games left in the regular season here in St. Louis.

27.04.2025 23:33 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Took this picture last night at the St. Louis Battlehawks game before it started. They gave us a mascot :).

07.04.2025 22:51 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Funny story about the transistors... I designed the circuit to use them.. tested with regular LEDs.. when I got the letters I was in a hurry and soldered all the ground wires together later realizing that was wrong. I didn't feel like resoldering it correctly so I connected directly.. :(.

19.03.2025 14:06 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Got these LED letters from @adafruit.com ... figured I'd use them to let people at work know who I am.

Running on an MSP430 microcontroller.. 100 ohms / 3.3v on each letter to get this level of brightness.

19.03.2025 09:54 β€” πŸ‘ 28    πŸ” 1    πŸ’¬ 1    πŸ“Œ 0
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NanoBeacon modules from @sparkfun.bsky.social soldered with analog 3 axis accelerometers for an upcoming project.

These are configured to emit the X, Y, Z values of the accelerometers every 500ms using bluetooth. An ESP32 is being used to read these values.

03.03.2025 22:18 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Got this Sipeed Tang Nano 20k #FPGA board and got the Verilog implementation of the W65C832 (32 bit 6502) I did earlier working with it.

The currently running program is written in assembly language and writes to a @sparkfun.bsky.social LCD display over SPI.

02.03.2025 19:13 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Short video of the feral cat that likes to visit me.

26.02.2025 02:22 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Here's a @sparkfun.bsky.social NanoBeacon breakout board with a 3 axis accelerometer. It's currently set up to announce it's rotational position every second to an ESP32.

First part of a new project...

15.02.2025 20:33 β€” πŸ‘ 5    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Here's a 1 bit half adder made out of transistors. This consists of an XOR gate (at the top, made out of 4 NAND gates of 2 transistors each) to do an add and an AND gate (2 transistors for a NAND and a 3rd to invert the output) for the carry bit.

02.02.2025 21:54 β€” πŸ‘ 4    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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This should be... 4 NAND gates and 1 AND gate made with transistors. Plus a could LED circuits.

01.02.2025 18:34 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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While attempting to take a picture of this feral cat before feeding her.. she smacked me and my phone.

27.01.2025 23:58 β€” πŸ‘ 4    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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This is a cheap R/C car replaced with my own electronics / firmware and 2 big ducted fans. Runs 2 MSP430's and wireless XBee's. A relay on the front is hooked up to an ATtiny85 circuit to cut power if it hits anything. Finished 5 years ago but never tried it for fear of winning a Darwin award.

26.01.2025 17:31 β€” πŸ‘ 4    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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$1 Wooden airplane + ATtiny85 microcontroller, tiny motors with propellers, IR receiver, and a 3.7v lipo battery. Earlier tests got it to pick up off the ground but I didn't capture it on video. This was probably the last flight.

17.01.2025 23:06 β€” πŸ‘ 4    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0
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Mike Kohn! Mike Kohn's music, software, and electronics projects.

That remote came with a cheapo IR helicopter I got a long time ago to create a "no fly zone" at work:

www.mikekohn.net/micro/syma_s...

Someone reverse engineered the protocol and posted it online. It's a pretty nice remote, so I've used it on lots of other projects.

17.01.2025 11:34 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
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Pizza Box Propeller Car - Powered by an #MSP430 and two small motors running at 3.3v (sadly off the regulator .. not good). Instead of wheels there are 3 castors at the bottom so it's very difficult to control.

16.01.2025 22:54 β€” πŸ‘ 4    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Actually... that's impressive you recognized the MSP430 on there.

16.01.2025 22:38 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Yep! I'll have a video for this one posted soon too (hopefully).

16.01.2025 21:12 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

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