Matrix user forums

Hi Abhi, It's not easy to do a straight conversion from the binary representation of a float to an integer.. You'll just need to do *100 however for pretty good result (some values can't be exactly represented in the float type) So int = float * 100 will give an int with two decimal places.. You cou...

I think the problem is - the program might execute the main loop multiple times per increment of the timer... (this is less of problem in simulation as it runs a lot slower than the MCU) One solution is to keep a record of where the 'change' time occurs and only change once... led test 2.fcfx Martin

Glad it's (sort of) working for you.

The flashing was a bit odd in simulation too - and I thought it was just timing issues there..

I'll have another play later today - but you'll maybe have it working by then.....

Martin

Thanks Martin,

Thought I'd gone with the clock interrupt... Interesting that the simulation worked

Martin

Hi Frank, What hardware are you using? - as per chart above or changed from that? The program relies on ticks being incremented by the interrupt to mark the passage of time.... So if the interrupt isn't working for some reason (or clock is dramatically slower - say MCU running at 4MHz instead of 40)...

Okay - a simple demonstration (works okay in SIM and should work better on hardware - timings may vary in SIM depending on your PCs performance) led test.fcfx Note that I've 'simplified' slightly for the sake of clarity - the timer actually runs at 30.518Hz - so the number of ticks in minute would a...

Yes, something odd with the forums (fora?) yesterday - powercut or DDOS???

I'll tray and make an example program this evening...

Martin

The delays 'block' so - here you'll have one channel run - then the 2nd... What I would suggest doing is having a timer interrupt incrementing a timer (for the sake of simplicity here lets say at 1s intervals) Then have in the main loop: if (tick < 60) Set Channel1 on, Set Channel2 off. if (tick > 6...

I wrote a basic component - see https://www.matrixtsl.com/mmforums/viewtopic.php?t=22246 There wasn't much interest so left as was - but should work on AVR or PiC (but not MCUs that use i2c transaction mode (Arm and ESP32 amongst others) If there is interest I could alter it to use transactions. Try...

That's an interesting idea. Of course the simplest way to draw a circle with two motors is to just use one of them :D If you use two motors you will have to combine horizontal and vertical steps - using an algorithm such as https://www.google.com/url?sa=t&source=web&rct=j&url=https://web.engr.oregon...

Just been experimenting with i2c on the interface board. Can't get it to work reliably - initially I used wi-fi and sometimes results would be correct - other times just 0 returned from i2c reads. Tried with USB and again sometimes results correct / sometimes not... Reading multiple (128) bytes from...

And a datasheet (which seems to show the layout as RGBW) https://cdn-shop.adafruit.com/product-files/2757/p2757_SK6812RGBW_REV01.pdf To confuse the issue - they are also available in RGB form - which accept 24 bit colour (GRB as per ws2812) https://cdn-shop.adafruit.com/product-files/1138/SK6812+LED...

Hi Chad, Won't work as is then... The source for the ws2812 component is on the forum @ https://www.matrixtsl.com/mmforums/viewtopic.php?f=76&t=22045&hilit=ws2812 - along with my refresh code which should be easier to modify. Basically need to extend the data transmitted to 32bits (which will make t...

Hi Chad, Just had an experiment with one of these. They take a 32bit value using the same timing as ws2812 leds. I modified my ATTiny85 ws2812 code to take a 32bit colour (note the ws2812 component has 24 bit color - no white - so would need modifying to have a 32 bit buffer. Here I just 'push' valu...

Looks an interesting project..

Good luck and keep us informed. I might have a go at making one if it works....

Martin

Sorry - not at computer now.. but is your value a float?

Just looked and it's an integer value - you'll need a floating point value for your result...

Martin

In a calculation use:

str = FloatToString$(value, 2) (or change 2 to required number of digits...)

Then print str.. (str defined a string variable..)

Martin

Glad to hear you got it working. That bar graph - graduated display looks great!

This forum doesn't have a specific section - I've posted stuff in the 'hints and tips' section....
The new v9 forum has a specific area https://www.flowcode.co.uk/forums/viewforum.php?f=10

Martin

One way to do it is with '|' (or operator) or to clear bits '&' (and operator)
will set bit 4 will clear bit 4

To set a 'variable' bit To set or clear multiple bits you can use a mask will set bits 7..4

Martin

A couple of ideas to try... In the first program: The max string length is limited to 10 chars (receive_pos = (receive_pos + 1) % 10 - receive_pos will go from 0..9 then back to 0 - so increase the 10 to allow for max length of string - might need to increase size of buffer (Data_string) too. What i...

Hi Ronny,

Can you post your code to date? - and I'll try and see why it's just getting the tail of the string...

Martin

Hi Ronny, The isCharWaiting function doesn't really have an equivalent in FC - what to do is to have an Rx interrupt that puts received characters into a circular buffer (either the FC component or a simple array and counter) There are examples here https://www.matrixtsl.com/mmforums/viewtopic.php?f...

Progress - so far...

See https://youtu.be/1rtbY4XN9Tc

Martin

Thanks, yes it didn't seem to cause a problem - and gone in v9...

Martin

Something like: senddata.JPG Where data (an array - you can use any value in the parameter definition, data[2] for example - and then pass any size array (data[10000]). Also pass the length - as mentioned this will allow data arrays (including 0) - if you want to use strings (0 is termination charac...