#usbhost

[adafruit]

Fruit Jam RP2350B credit-card mini computer with all the fixin's 🍓🍇💾

We were catching up on a recent Hackaday hackchat with Eben Upton (https://hackaday.io/event/202122-raspberry-pi-hack-chat-with-eben-upton) and learned some fun facts: such as the DVI hack for the RP2040 was inspired by a device called the IchigoJam (https://www.hackster.io/news/ichigojam-combines-strawberry-and-raspberry-to-deliver-a-raspberry-pi-pico-powered-educational-micro-66aa5d2f6eec). We remember reading about this back when it was an LPC1114, now it uses an RP2040. Well, we're wrapping up the Metro RP2350 (https://www.adafruit.com/product/6003), and lately, we've been joking around that with DVI output and USB Host support via bit-banged PIO, you could sorta build a little stand-alone computer. Well, one pear-green-tea-fueled-afternoon later we tried our hand at designing a 'credit card sized' computer - that's 3.375" x 2.125", about the same size as a business card (https://hackaday.com/2024/05/07/the-2024-business-card-challenge-starts-now/) and turns out there's even a standard named for it: ISO/IEC 7810 ID-1 (https://www.iso.org/standard/70483.html).

Anyhow, with the extra pins of the QFN-80 RP2350B, we're able to jam a ridonkulous amount of hardware into this shape: RP2350B dual 150MHz Cortex M33 w/ PicoProbe debug port, 16 MB Flash + 8 MB PSRAM, USB type C for bootloading/USB client, Micro SD card with SPI or SDIO, DVI output on the HSTX port, I2S stereo headphone + mono speaker via the TLV320DAC3100 (https://www.digikey.com/en/products/detail/texas-instruments/tlv320dac3100irhbt/2353656), 2-port USB type A hub for both keyboard and mouse or game controllers, chunky on-off switch, Stemma QT I2C + Stemma classic JST 3-pin, EYESPI for TFT displays, 5x NeoPixels, 3x tactile switches, and a 16-pin socket header with 10 A/D GPIO + 5V/3V/GND power pins. The PSRAM will help when we want to do things like run emulations that we need to store in fast RAM access, and it will also let us use the main SRAM as the DVI video buffer.

When we get the PCBs back and assembled, what should we try running on this hardware? We're pretty sure it can run DOOM. Should that be first? :) We also need a name. Right now, we're just calling it Fruit Jam since it's inspired by the IchigoJam project.

[integrating-sphere]

Impedance Analyzer: Precision Instrument for Measuring Electronic Component Impedance Characteristics

An impedance analyzer is a specialized electronic instrument used to measure the impedance characteristics of electronic components, circuits, and material elements. It is capable of characterizing the impedance of devices and materials over a range of frequencies, making it suitable for applications in various fields including material science and electronic circuit design. Operating Principle The core principle of an impedance analyzer relies on phase-sensitive detection technology, which measures the current and voltage responses of the device under test during frequency scanning. Specifically, the analyzer accurately measures the magnitude and phase of complex impedance as it varies with frequency. Key Parameters • Frequency Range: Specifies the range of frequencies over which the impedance analyzer can perform tests. • Impedance Range: Indicates the range of impedance values that can be measured. • Accuracy of Magnitude and Phase: Ensures precise measurement of impedance magnitude and phase angle. • Measurement Speed: Refers to the rate at which the impedance analyzer conducts measurements. • Biasing Functionality: Allows the application of voltage or current bias during testing. Applications • Electronic Components: Used for measuring the impedance characteristics of resistors, capacitors, and inductors. • Electronic Circuits: Analyzes impedance matching and optimizes circuit performance. • Material Science: Characterizes the impedance properties of dielectric materials such as biological tissues, foods, and geological samples. • Research and Development: Provides essential impedance data support for researching new materials and developing high-performance electronic devices. LS90_Impedance analyzer Conclusion The impedance analyzer serves as a crucial tool in the field of electronic testing, offering precise measurement capabilities and supporting technological advancements in various domains. By measuring the frequency-dependent characteristics of complex impedance, the impedance analyzer provides reliable data for electronic components, circuit design, and material science, thereby driving innovation and development in diverse technological fields. LS70/80 series impedance analyzer is mainly used for ferroelectric, piezoelectric ceramics, piezoelectric crystals, ultrasonic transducers and other devices impedance analysis and testing. It’s the frequency scanning and impedance measurement and analysis of piezoelectric devices and equipment value solution and it can quickly and easily test the parameters of piezoelectric devices. LS90 series impedance analyzer can be widely used in such as inductors, capacitors, resistors, microphones, resonators, liquid crystal displays, varactor diodes, transformers and other impedance performance research and production line QC inspection. In addition to the function of computer scanning analysis, it also provides the function of direct display of impedance – frequency scanning curve analysis of piezoelectric devices on the instrument. This eliminates the need for a computer for each instrument. This method not only ensures the test efficiency, but also reduces the test cost, and is convenient for customers to use in the production line. At the same time, the product uses the principle of vector testing, and its good measurement accuracy, ultra-wide frequency range and excellent stability can meet most of the measurement requirements of ultrasonic devices and materials. Impedance analyzer is equipped with RS232C, USB DEVICE, USBHOST, HANDLER interface, and optional RS485 interface, GPIB interface. It can easily communicate with PC data and remote control in order to establish an automatic test system. LS8590 series uses automatic balance bridge technology and four-terminal Kelvin test terminal. The measurement frequency range covers 20Hz~25MHz, the minimum resolution of 1mHz. The basic measurement accuracy can reach 0.05%. Read the full article

[patrickdsp]

Happy little birthday gift for me just arrived. Iconnectivity Mio XM #midi #sync #usbhost #tighter https://www.instagram.com/p/B4MrZI4gOZV/?igshid=w1a4ww8ygshe

[enewground]

📸 Photo of the day: USB host shield for Arduino. #Enewground #arduino #arduinoshield #arduinouno #arduinomega #usb #usbhost #maker https://www.instagram.com/p/B0Kij4DHtTt/?igshid=gunlhn5mj0gv

[t2mip]

T2M USB 3.1 Host Controllers used in wide range of products such as Graphics Controller, Flash Storage Controllers, SATA Bridges with support for Embedded Hosts, Docking Stations, Mobile Application Processors.

[ergautam]

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[bassaam11]

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[ensnowtech-blog]

ES-Z307 Optical Sensor biometric fingerprint time attendance machine RS232/485, T CP/IP,USBhost https://ensnow.onloon.net/detail?itemId=f081ab6d5150412190342daa5776e390 #accesscontrolpanel #biometricreader #dooraccesspannel #rs483 #tcpip #timeattendance #biometricfingerprint #fingerprintreader #rfidreader #accesscontrol #exitreader https://www.instagram.com/p/BobkmCGH5YY/?utm_source=ig_tumblr_share&igshid=vni9a0ohq7id

[adafruit]

We designed and prototyped an RP2350 Metro a few months ago, and it worked OK, but we were really short on pins, which meant a lot of annoying compromises - so we ended up only fabbing the RP2350 Feather to start. With that design flying off the shelves, It's time to revisit the Metro. We wanted to jam-pack this design, and with the extra GPIO on the B we have plenty of peripherals: the 22-pin HSTX for DVI output, Stemma QT port, NeoPixel, JST 3-SH SWD debug port, 16MB flash, an extra spot for PSRAM, MicroSD card with SPI or SDIO connections, and 5V buck converter that can give us 2 Amp easily, which we'll need since we also have a USB Host port pinout for connecting USB peripherals. We even managed to get a couple of niceties like switchable power for the USB host power, a USB boot button as user input, and an SD card detect GPIO.

[adafruit]

HSTX DVI output on Fruit Jam! 🎨🖥️🎶🚀🔌

Woo! This xscreensaver-like demo shows random lines and colors displaying on a mini 7-inch HDMI monitor

it's a 320x240 'pixel doubled' display that is running from the Fruit Jam, an RP2350-based mini computer board

But what's cool is that we're now using the HSTX interface rather than PIO+core bit-banging. That means we now have plenty of extra resources for running the USB host… which is still being worked on.