Michael Kohn
@mikeakohn.bsky.social
Vacuum Tube Oven Experiment: I built this circuit around an ATtiny2313 microcontroller which could turn on / off 2 vacuum tubes in a thermos based on temperature from a MAX31855 kit from @adafruit.com.
Tried to cook a kind of St. Louis style pizza..
More info: www.mikekohn.net/micro/easy_b...
Tried to cook a kind of St. Louis style pizza..
More info: www.mikekohn.net/micro/easy_b...
November 19, 2025 at 11:19 PM
Vacuum Tube Oven Experiment: I built this circuit around an ATtiny2313 microcontroller which could turn on / off 2 vacuum tubes in a thermos based on temperature from a MAX31855 kit from @adafruit.com.
Tried to cook a kind of St. Louis style pizza..
More info: www.mikekohn.net/micro/easy_b...
Tried to cook a kind of St. Louis style pizza..
More info: www.mikekohn.net/micro/easy_b...
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...
This is a musical MIDI keyboard with Kit Kat candy for keys. Longer video and more info here:
www.mikekohn.net/micro/edible...
October 12, 2025 at 8:13 PM
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...
This is a musical MIDI keyboard with Kit Kat candy for keys. Longer video and more info here:
www.mikekohn.net/micro/edible...
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...
www.mikekohn.net/micro/ip_ove...
September 28, 2025 at 11:01 PM
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...
www.mikekohn.net/micro/ip_ove...
Further progress on my latest FPGA project. This shows HDMI output with some Atari 2600 looking image and some sprites animating.
September 25, 2025 at 4:34 PM
Further progress on my latest FPGA project. This shows HDMI output with some Atari 2600 looking image and some sprites animating.
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...
More Info:
www.mikekohn.net/micro/guitar...
August 10, 2025 at 2:46 PM
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...
More Info:
www.mikekohn.net/micro/guitar...
Here's some of Post-it Note artwork I made.
June 27, 2025 at 4:02 PM
Here's some of Post-it Note artwork I made.
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...
June 19, 2025 at 2:50 PM
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...
Got a pin from the St. Louis Battlehawks for being a season ticket holder. Looking forward to the next season of the UFL!
June 11, 2025 at 4:49 PM
Got a pin from the St. Louis Battlehawks for being a season ticket holder. Looking forward to the next season of the UFL!
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...
June 7, 2025 at 3:24 PM
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...
Instead of a standard root beer float, here's a (non-alcoholic) beer float with strawberry shortcake ice cream.
June 6, 2025 at 9:12 PM
Instead of a standard root beer float, here's a (non-alcoholic) beer float with strawberry shortcake ice cream.
The past couple days of BlueSky has given me a craving for chicken TACOs. So made a couple for breakfast...
May 31, 2025 at 2:52 PM
The past couple days of BlueSky has given me a craving for chicken TACOs. So made a couple for breakfast...
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...
www.youtube.com/watch?v=FCKg...
Race Track For RC Car
YouTube video by Mike Kohn
www.youtube.com
May 15, 2025 at 9:15 AM
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...
www.youtube.com/watch?v=FCKg...
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...
www.youtube.com/watch?v=_FQi...
Mini Golf Circuit
YouTube video by Mike Kohn
www.youtube.com
May 14, 2025 at 1:26 PM
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...
www.youtube.com/watch?v=_FQi...
Caught this feral cat taking a nap on my deck the other day.
April 28, 2025 at 12:55 AM
Caught this feral cat taking a nap on my deck the other day.
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.
April 27, 2025 at 11:34 PM
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.
Took this picture last night at the St. Louis Battlehawks game before it started. They gave us a mascot :).
April 7, 2025 at 10:51 PM
Took this picture last night at the St. Louis Battlehawks game before it started. They gave us a mascot :).
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.
Running on an MSP430 microcontroller.. 100 ohms / 3.3v on each letter to get this level of brightness.
March 19, 2025 at 9:54 AM
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.
Running on an MSP430 microcontroller.. 100 ohms / 3.3v on each letter to get this level of brightness.
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.
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.
March 3, 2025 at 10:18 PM
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.
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.
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.
The currently running program is written in assembly language and writes to a @sparkfun.bsky.social LCD display over SPI.
March 2, 2025 at 7:14 PM
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.
The currently running program is written in assembly language and writes to a @sparkfun.bsky.social LCD display over SPI.
Short video of the feral cat that likes to visit me.
February 26, 2025 at 2:22 AM
Short video of the feral cat that likes to visit me.
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...
First part of a new project...
February 15, 2025 at 8:33 PM
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...
First part of a new project...
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.
February 2, 2025 at 9:54 PM
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.
This should be... 4 NAND gates and 1 AND gate made with transistors. Plus a could LED circuits.
February 1, 2025 at 6:34 PM
This should be... 4 NAND gates and 1 AND gate made with transistors. Plus a could LED circuits.
While attempting to take a picture of this feral cat before feeding her.. she smacked me and my phone.
January 27, 2025 at 11:58 PM
While attempting to take a picture of this feral cat before feeding her.. she smacked me and my phone.
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.
January 26, 2025 at 5:31 PM
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.