The digispark and digispark pro are also some nice <$15 development boards that are USB programmable, use the Arduino IDE or AVR compiler, and have just enough pins to be useful.
On Wed, Dec 13, 2017 at 4:34 PM, jimlux <jim...@earthlink.net> wrote: > On 12/13/17 1:28 PM, Jerry Hancock wrote: > >> Well, if you haven’t selected a DDS and you need I/Q, I would go with the >> tried and true 9854 as it has I/Q outputs and I thought a 12bit DAC so the >> resulting spurs and sfdr are lower than other chips, or were, as I think >> they have 14bit DACs on other chips now. It also depends on the highest >> frequency range needed and power requirements as they all seem to run hot. >> There is a new DDS, a 9910 I think, that uses a 14bit DAC but it is a >> single output and would need to sync clocks if you need I/Q. I have used >> the 9854 with PIC, Arduino and STM32 and assuming the frequency range is >> ok, I found it to be the better of the chips. I don’t think they have a >> replacement for it (I/Q with 14bit DAC would be great) but I haven’t looked >> lately. >> >> The language is C but I think it has C++ and C# compilers out there. >> Also, once you have the code tested on the Arduino you can just run it on >> the equivalent AVR chip and build your own board. I don’t think there is a >> license or runtime compiler issue and if there is, I remember seeing a GNU >> compiler for the AVRs and Arduino. My only point is that for prototyping >> and testing, the Arduino seems to be the easiest with tons of support and >> many, many adapters and I/O, The STM32 boards are faster but the learning >> curve is just unbelievable. It took me months to master those boards >> compared to minutes for the Arduino. >> >> > > I agree - $20 for a Teensy, some jumper wires from solder holes on the > Teensy to your breadboard, load up the Teensyduino libraries into the > Arduino IDE and your SPI/I2C/serial interface is done. I did this to write > arduino code to drive a Silabs part. > > If it takes an hour, I'd be surprised (or you have an incredibly slow > download connection, like doing it on an airplane in the back rows where > the WiFi is clunky - which I have done). The hard part when going to a > standalone design is picking the right pins on the microcontroller (since > so many have multiple functions, you want to be careful about accidentally > using something that has another useful function). > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/m > ailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.