USB – RS232 converter, uses only Tx and Rx lines, with selectable 2400, 9600, or 38400bps. PCB projected to fit in old mobilephone cable, most of parts is surface-mounted. For more info see original autor Osamu Tamura site. Pcb’s, driver, and firmware is attached below.
Converter USB – RS232 – [Link]
3in1 universal converter. Based on FTDI 232R chip seen as normal COM port, and two serial converters MAX232 and MAX485. Allow to be used as RS232, RS485, or UAR TTL converter. Connections parameters can be set through the system, as in normal COM port. Supported speeds: 110 to 921600bps.
3in1 converter – USB to RS232, RS485, UART - [Link]
Arhi tested out the VEHO Discover VMS004 Delux USB microscope: [via]
As expected – the “tripod” is crappy but could be used with some modifications…
The unexpected “con” wrt this microscope is that it can only do 20x and 400x – nothing in between. Not really what I expected, but not too big of a problem at the end. The 400x is ok for examining joints only dof is so shallow that it will take some getting used to ..
VMS004 delux USB microscope - [Link]
I have designed many small footprint PIC projects (such as, pocket watches and wristwatches) but I cannot make them really portable. To make them portable, I need small power sources. Of course, Coin Cell battery would be the smallest DC source that I can buy. The problem is that a Lithium button cell provides 3 V. which is not enough to drive my projects. I thought about using DC-DC step-up converter to boost 3 V. to 5 V. However, it’s a little bit complex to add DC-DC converter to the projects. Moreover, my projects consume a lot of power as they consist of many LEDs, a button battery will not last for a day. So, I stopped my think at that point.
USB Coin/Button Cell Battery Charger - [Link]
I’ve recently built a single-sided, through-hole version of the USB IR Toy v2, using the schematic posted on the wiki for it without the pin breakout area…
Mine is 40x50mm using an USB-A connector and includes a USB pin header, VCC/GND/RX/TX header for serial communications and ICSP – had to dispense with the pin breakout area though.
gSchem and PCB formatted design files are posted.
Single-sided, through-hole USB IR Toy v2 – [Link]
bidouille.org writes: [via]
The Kvarts DRSB-01 (Кварц ДРСБ-01) is a simple consumer Geiger counter. It does not feature a display of any kind like most modern Geiger counters do, but instead each particle detected by the tube make a very characteristic “click”. It was manufactured in the early 1990’s and is not made any more, but you can still find it commonly on places like eBay. I got mine for about 15€ a few years ago, but unfortunately prices have skyrocketed recently after the events in Fukushima brought back the reality that is radioactivity into everyone’s minds.
Geiger Counter USB Hack – [Link]
This is a USB interface board I’ve built around a PIC 18f4550 microcontroller from Microchip. As many of you probably know, I’ve used my computer’s parallel port to connect many things to my computer. However, most laptops don’t have parallel ports these days, so I needed a way to connect things without a parallel port. This board does exactly that (and actually much, much more). I found a really nice tutorial on building this board here – http://eegeek.net/content/view/13/32/
Homemade USB interface board using a PIC – [Link]
One of the biggest hurdles for the mythTV community seems to be providing an IR receiver so that you can use your remote control with it. I had been using a serial ir receiver but decided to try building my own USB receiver. This is based on the work by Dick Streefland found here: http://www.xs4all.nl/~dicks/avr/usbtiny/
USB IR Receiver – [Link]
Here is an easy an popular way to start using USB in your designs without going into learning the complicated USB protocol. This circuit converts normal USART signals from any microcontroller into USB compatible signals which can be directly connected to the PC. If u r designing a circuit and u need pc interface, then this is the best way, use USB, as the RS232 ports are disappearing from PCs and laptops very fast.
USART-to-USB converter using FT232BM chip – [Link]