PWM signal generated using the TIMER1. In the end I also gave in to the temptation of playing with the tiny 10 cent RISC-V... #RISC_V #CH32V003 #MounRiver #Arduino

Kenbak-1 replica front panel ready. I used a PCB (FR4) to mount the keys, LEDs, and headers aligned with the motherboard connections. An aluminum printed circuit board was used to reproduce the machining of the front panel and its lettering. #KENBAK #retrocomputing

The KIM-1 circuit diagram. I have been restoring this image to print a vinyl poster to be hung in my studio. #6502 #MOS6502 #KIM1 #COMODORE #Retrocomputing

Impressive how LED efficiency has advanced, only 16mA to power 9-digit .28" display. This is part of an effort to reproduce the IMSAI 8048 Control Computer. #IMSAI8048 #D8748H #D8749H #INTEL #Retrocomputing #MCS48 #Microcontroller

When I finish copying the monitor listing (with the help of OCR), and adapt it to the cross-assembler, then I will surely find the rom somewhere hidden on the web. #IMSAI8048 #D8748H #D8749H #INTEL #Retrocomputing #MCS48 #Microcontroller

Experimenting with #M5Canvas and the use of Sprites #M5Stack #Arduino

This little keyboard seems to work fine on 3.3V, draws around 2 milliamps and works with the Arduino library #PS2Kbd ... awesome! #ESPRESSIF #Arduino #ESP32

Designing a keyboard to modify parameters in my applications... #ESP32 #CYD John Lee @Arduino

Kenbak-1 MEGA, a shield for the Arduino MEGA... #Arduino #kenbakuino #Kenbak #ArduinoSimulator #retrocomputing

I put a warning on the Kenbak MEGA's solder side. It is a known issue that some Arduino shields have solder-side pins that can potentially short against the USB connector on the Arduino board. #Arduino #kenbakuino #Kenbak #ArduinoSimulator #retrocomputing #Kenbakmega

Testing the Kenbak-1 MEGA Shield, Cylon-style led pattern, program included in the kenbakuino simulator. #Arduino #kenbakuino #Kenbak #ArduinoSimulator #retrocomputing

The Kenbak-1 Arduino UNO Shield could offer a second life to the countless Arduinos currently collecting dust on shelves, in drawers, and in forgotten boxes around the world... :-) #Arduino #kenbakuino #Kenbak #ArduinoSimulator #retrocomputing

"Kenbak-1 MEGA" is a shield for the #Arduino MEGA, running firmware based on Mark Wilson’s #Kenbakuino. It uses the MEGA’s abundant I/O pins instead of shift registers, reducing external components. #Kenbak #ArduinoSimulator #retrocomputing

"Kenbak-1 UNO" is an Arduino UNO Shield with firmware based on Mark Wilson’s Kenbakuino project. It replaces the shift registers by multiplexing to control LEDs and buttons. #Arduino #kenbakuino #Kenbak #ArduinoSimulator #retrocomputing

Reviving a Windows 98 computer setting to program the INTEL #D8748H using the Needham's Electronics EMP-20 programmer. #INTEL #Retrocomputing #MCS48 #Microcontroller #vintagecomputing #retrogaming #eprom

I'm sending a 1 kHz signal using Amplitude Shift Keying (ASK) modulation in the 433 MHz frequency band, using a pin on the #ESP32 and a spring antenna. The signal has a limited range due to the use of the 13th harmonic of a 33.3 MHz at the pin. John Lee

Insane #ChatGPT: "Can you write a sketch for the Arduino leonardo (ATmega32u4) to read two cuadrature encoders..." Knowing what you want is becoming more important than knowing how to do it...

Using #Procesing4 to draw size and centers of mass of each color detected by the ESP32-CAM (25 frames/second) #computervision #colordetection John Lee Processing @Arduino