A review of the Tiny Code Reader, a $7 QR code sensor, detailing its setup, functionality with I2CDriver, limitations (tight centering requirement), and internal components (RP2040 microcontroller and Arducam image sensor).
This article details the design and construction of a 512-bit magnetic core memory system running at 200kHz, including the challenges faced, scaling techniques, and practical advice for building your own system.
Documentation for the ESP32-2432S028R, nicknamed the "Cheap Yellow Display" (CYD), a 2.8" LCD with touchscreen. Includes setup, examples, troubleshooting, and community links.
Building a community around a cheap ESP32 Display with a touch screen. This display is an ESP32 with a built in 320 x 240 2.8" LCD display with a touch screen called the "ESP32-2432S028R".
This article discusses the history of cassette data storage used with early home computers. It details the Kansas City standard, how data was encoded using frequency shift methods (2.4 kHz for ones, 1.2 kHz for zeros), and the challenges posed by the imperfect nature of consumer-grade audio recorders. It also mentions alternative schemes and the use of 555 timers and op-amps for decoding.
This project details building a system to send images in real-time from high altitude using SSTV (Slow-Scan Television) and PMR walkie-talkies. It covers hardware setup, code configuration, and launch results. Note: PMR is under ham radio license in US.
Recycle1234 offers free business pickups and recycling services for e-waste, solar panels, batteries, lamps, and other electronics. They serve businesses, data centers, homes, schools, government facilities, churches, recyclers, and non-profits. Their services include white glove certified e-waste pickup, no-contact self-service drop-off, and reselling of electronics with high resale value. They are located in Union City, California and are CalRecycle, DTSC, and CA EPA certified.
Everyone who deals with electronics knows that grounding is important. However, Kristen K6WX » has news: the idea of ground is kind of a myth. She explained at a talk at the recent ARRL National Convention, and if you didn’t make it, you can watch it in the video below.
