I have been looking a long time for a USB-Serial cable that works at 1.2V signal voltage for use with FPGAs. Most USB-Serial cables work at 5V or 3.3V signal voltage. FDTI have a cable that works down to 1.8V, but not lower. It would of course be possible to design some kind of voltage converter to sit between the USB-Serial cable and the FPGA, but it is a little bit of hazzle. Why is isn't there a cable that has the voltage converter built-in, I thought, and googled a lot. Finally I happened to find the correct combination of key words for Google, and ended up Duppa. Hint to Duppa: add tags 1.2V, 2.5V, 2.8V etc to your web site, and I would probably have found you a long time ago.
I bought a couple of USB to Uart with Voltage Translator. I have tested with an FPGA at 1.2V signal voltage, and at bit rates 115.2 kbit/s and 3Mbit/s. It works perfectly. Recommended!
Dec. 9, 2019
Beautiful product & ingenious idea, but has one small issue
I'm continuously amazed by how cool this looks. It's so much better than my boring old plastic badge holder. The only problem is that it blocks my badge's RFID access in one particular door in my office building. I don't know if its the fake antenna on the PCB or just the copper that throws it off, but I need to remove my badge to get into that door. Even with this slight annoyance, I'm still rocking this badge holder.
Response from DUPPA | Dec. 9, 2019
Thank you for the review! I'm sorry for that problem! First time that i heard about that issue! Probably it's the inner border that make a loop... i will fix it in the next release!
May 8, 2019
Useful way to incorporate an encoder with minimum pins
This is a low cost method of incorporating an encoder with RGB or with an RGB LED for the minimum number of pins ( 2 or 3) and without loss of responsiveness if using a low end micro controller.
Getting it working was not exactly painless as it is easier to find the V1 Arduino libraries than the V2 version but once working it is easy to control LEDs and encoder interactions. It is also possible to use it without the library making for very compact code.
Shipping was inexpensive but did not win prizes for rapidity. However receiving and unboxing the encoder was a mini-joy: the shipment arrived safely in a small padded bag. Inside was a sturdy but really micro-sized cardboard box complete with the board, RGB encoder, knob, RGB LED, male and female right-angled headers and pullup resistors presoldered plus a small but nicely conceived compliments slip.
Boards can be purchased without the pullup resistors but these are essential and a better system would be to include them on all boards with a solder jumper to bypass them. This might increase production costs slightly but would improve flexibility and easy of use.
Response from DUPPA | May 14, 2019
Thank you for the review!