Paul__B:
Sounding like my wife!
Dave Barry wrote something funny about that ages ago. He wrote something like:
I want to get a new PC, but my wife disagrees because --- get this! --- the old one works perfectly well.
I found the quote: http://www.ibiblio.org/jimmy/mcguinn/Barry.html
For example, as a guy, I feel I need a new computer every time a new model comes out, which is every 15 minutes. This baffles my wife, who has had the same computer since the Civil War and refuses to get a new one because -- get THIS for an excuse -- the one she has works fine.
mcnobby:
I agree with MrBurnette, the stm32diuno's are slowly become well supported are are awesome for the money !!As a sidenote : I have had many AVR running at 32MHz (tiny13, tiny85, '328, '1284) using a clock oscillator (very cheap !) I also have a 40MHz clock waiting to be tested, should work fine, there was no noticable temperature change at 32MHz and no unusual glitches over several months
It's not all about temperature. It can easily get unstable without overheating
I need to count 6000 pulses a second on 2 pins and possibly 2 more
I have been considering a teensy but this looks even better !
I am very faithful to arduino it has helped me get started into the world of microprocessors and the reason it bas been so sucessful is this forum ! A place we can go for knowledge, help and a sense of humour !
I recently bought a pcduino that is a neat product, it can run android and linux. I was hoping its fast processor could count more pulses - sadly the operating system sucks up all the extra power.
The biggest problem with the pcduino is the support ! It sucks so bad i have given up using it !
The arduino support is excellent. It is the main reason the product has been sucessful.
Anyway back to the maple mini :
Can it count 6k pulses on 2 pins ?
how do i find out which i/o pins are 5v tolerant ?
I am going to buy a couple and try them out
A place we can go for knowledge, help and a sense of humour !
Oh, aye, we have that here!
Can it count 6k pulses on 2 pins ?
My sketch on this page: Gammon Forum : Electronics : Microprocessors : Timers and counters counts up to 8 MHz so I don't think the Atmega328 will be too troubled by 6 kHz.
Gadget999:
<...>
The arduino support is excellent. It is the main reason the product has been sucessful.Anyway back to the maple mini :
Can it count 6k pulses on 2 pins ?
how do i find out which i/o pins are 5v tolerant ?I am going to buy a couple and try them out
2 things:
- The Arduino Forum is great: fantastic members with a broad spectrum of knowledge. While Arduino.cc as a company deserves great praise for paying for the costs with the understanding that a free forum for ideas and support is a key to their success. It is my understanding that Forum Moderators are unpaid and their job is very often thankless: Kudos to the company and the FM.
However, things are changing and with all the new boards being injected into the market, much of the old knowledge-base is not going to be 100% directly transferable to new products. What will transfer is the scientific method and rational reasoning; hopefully, this will sustain the forums which is the primary support vehicle.
- Other than to give you the link for "which i/o pins are 5v tolerant ?", I would suggest coming over to stm32duino.com and lurking around. If you are Arduino knowledgeable, you will find the forum reasonably comfortable. It is not newbie friendly as this forum, but there are good people willing to help out in a non-critical way assuming you have done your homework with Google: Please consult the older Maple and Maple Mini documentation first as most newbie questions should be there.
Ray
Thanks for the help guys
I will get a maple mini and have a play with it
Nick - thanks for sharing the frequency counter code
I wanted to use interrupts to do the counting, do some calcs and then transmit the data via the serial port. Have you tried the max frequency you can count using interrupts ?
mrburnette:
However, things are changing ...
For example: http://blog.arduino.cc/2015/04/30/microsoft-and-arduino-new-partnership/
Gadget999:
I wanted to use interrupts to do the counting, do some calcs and then transmit the data via the serial port. Have you tried the max frequency you can count using interrupts ?
I have multiple sketches on that page. One counts frequency, the other period (and deduces frequency). You can actually get a higher max frequency by using the hardware to count, otherwise there is an unavoidable overhead of around 4µS to maybe 6 µS for the ISR to kick in, add one to a counter, and leave again. Meanwhile the hardware can count pretty much at the system clock rate (maybe half that) which is more like every 125 nS.
As I said above, the sketch I mentioned counts up to 8 MHz - that's half the system clock rate. I don't think you can better that. Using interrupts it would be more like 125 kHz if not less.
Yes, I've seen the press release; but I am not impressed. IMO little end-user good will come from this mess. Arduino.cc is in a bad place right now and Microsoft is looking (IMO) for any way to become relevant again.
Ray
(Prior MCSE)
mrburnette:
Yes, I've seen the press release; but I am not impressed. IMO little end-user good will come from this mess. Arduino.cc is in a bad place right now and Microsoft is looking (IMO) for any way to become relevant again.Ray
(Prior MCSE)
Microsoft will probably crap all over it and the open source idea. Everything since Windows 8 has just gone straight down the sewer.
i bought some of the mini maples and also came across this
is it arduino ide compatible and is it just a counter chip ??
i do fear for the future of arduino if microsoft are involved, they have lost their grip on the pc world and may go for a grab of this technology
I would stay away from that board... a $2 pro-mini will serve you better.
Core Processor STM8
Core Size 8-Bit
Speed 16MHz
Connectivity I²C, IrDA, LIN, SPI, UART/USART
Peripherals Brown-out Detect/Reset, POR, PWM, WDT
Number of I/O 16
Program Memory Size 8KB (8K x 8)
Program Memory Type FLASH
EEPROM Size 640 x 8
RAM Size 1K x 8
===================
There is really much more going on in the ARM world than the processor... one must take into account the technology the chip manufacturer (Atmega, ST, etc.) is integrating via license from ARM for the Mx processor.
As you can determine from the above link - ARM M0+ is NOT ARM M3 ! Therefore, the M0+ being used in the new Arduino Zero will not perform the same as the ARM M3 used in the STM32F103 Maple boards being purchased for as low as $4 from China.
The other very serious issue is that the ATSAMD21J used in the Zero is significantly lower current per pin than the STM332F103CBT6 used in the Maple Mini. Always look at the sink/source CMOS driver I/O pins current capability! For example, the Zero can sink/source 7mA per pin... not even enough to brightly light a LED. The STM32F103 can sink/source is 25mA ... enough to easily supply a LED or even directly drive a small OLED display.
One must make an informed decision when purchasing Arduino "Genuino" products verses clone products. Advanced users will undoubtedly make a different decision than novices - well, at least I hope they do! IMO: a novice should not buy clones. The support simply is not available.
Another thing that goes deep into the technology is how the chip architecture is managed. Nothing can be more obvious that the memory address architecture: Von Neumann vs Harvard.
Access to integrated peripherals and "core" support for advanced feature such as DMA, I2S, and DAC must be considered in the light of usability. Unless you are competent on writing your own low-level driver code for a component, one should consider core and library and example code mandatory.
Often overlooked is the 3.3V design of the new chips. Interfacing can be a problem when using 5V sensors and other interfaces and can complicate a design. However, some chips such as the STM32F103 has a large number of 5V tolerant pins and thus can save time and component count in some situations. So two things must be considered: voltage levels of the pins and current capability of the pins.
As the new boards are introduced, clones will follow and the market will be even more complicated than today. So, if one does not know what they are doing - stay on the well supported path. Venturing off course into uncharted waters can easily cost you a great amount of frustration and even some significant money if you fry your board.
Ray