Search found 663 matches

by ag123
Thu Jul 20, 2017 12:14 pm
Forum: Projects
Topic: STEP GPS LOGGER, GPS CLOCK, Bicycle computer and more
Replies: 6
Views: 120

Re: STEP GPS LOGGER and more

wow, but do post in english as more people in the world would be able to read this as well :D
normally i'd simply program this on an android phone as it needs gps + mobile (gsm/3g-wcdma/lte) etc
to do all that on stm32f103cb 20k sram with a gui is quite an achievement :D
by ag123
Tue Jul 18, 2017 7:26 pm
Forum: General discussion
Topic: pricing disparity implies higher forward prices?
Replies: 2
Views: 59

pricing disparity implies higher forward prices?

bluepills are presently selling for $2 maple mini (clones) about double that https://www.ebay.com/sch/i.html?_from=R40&_nkw=stm32f103&_sacat=0 however the list prices on ST's web site http://www.st.com/content/st_com/en/products/microcontrollers/stm32-32-bit-arm-cortex-mcus/stm32-mainstream-mcus/stm...
by ag123
Mon Jul 17, 2017 2:59 pm
Forum: Projects
Topic: stm32 car fuel injection ecu
Replies: 6
Views: 248

Re: stm32 car fuel injection ecu

oops i forget about this thread, but speeduino do look pretty interesting & possibly fun, but do agree that if things go wrong it may be possibly explosive stm32 given its speed vs atmega would likely run both the engine & show you all the graphs e.g. fuel economy on an lcd while the car is running....
by ag123
Thu Jul 06, 2017 4:47 pm
Forum: Off topic
Topic: Help with preprocessor macro/xmacro
Replies: 2
Views: 102

Re: Help with preprocessor macro/xmacro

would an array work? e.g. instead of
led1 = 1;
led2 = 2;
led3 = 3;

use an array instead
int led[10] = { 1, 2, 3, 4, 5, 6, 7, 8, 9 10 };
:)
by ag123
Tue Jul 04, 2017 6:52 am
Forum: Projects
Topic: Porting Marlin to STM32.
Replies: 32
Views: 715

Re: Porting Marlin to STM32.

the L6470 is a much better stepper driver than the Pololu Ramps style drivers 1/128 microstepping and SPI interface it would really make the 3d printing run extremely smooth a4988 and drv8825 has only 16 and 32 microsteps respectively http://reprap.org/wiki/A4988_vs_DRV8825_Chinese_Stepper_Driver_Bo...
by ag123
Tue Jul 04, 2017 6:27 am
Forum: Projects
Topic: RTC CLOCK on BLUE PILL with Four 7 segments
Replies: 15
Views: 577

Re: RTC CLOCK on BLUE PILL with Four 7 segments

i'd guess stm32f103 can take quite a bit of abuse (with leds), i simply lit up my ILI9341 lcd backlight led with a gpio pin across a 900 ohm on board resistor but for 7 segment leds, it is better to be safe and add some resistors perhaps, otherwise 1'd likely be playing dice with the magic smoke mon...
by ag123
Mon Jul 03, 2017 5:10 pm
Forum: Projects
Topic: Porting Marlin to STM32.
Replies: 32
Views: 715

Re: Porting Marlin to STM32.

@Chriss I was having a look at the steppers and the board config file. I see the steppers support an SPI interface, and they can even be daisy chained one to another, so they shift out data to the next stepper as long as CS is kept low, but can also be managed independently with their own CS line e...
by ag123
Sun Jul 02, 2017 5:22 pm
Forum: Projects
Topic: Porting Marlin to STM32.
Replies: 32
Views: 715

Re: Porting Marlin to STM32.

no worries, victor, i appreciate your efforts and sticking with marlin is probably a best solution after all. it is a 'most prominent' open sourced 3d printing firmware 'out there'. if we make enhancements, e.g. to organise codes so that they could more easily be ported / run on different platforms,...
by ag123
Sun Jul 02, 2017 9:20 am
Forum: Projects
Topic: Porting Marlin to STM32.
Replies: 32
Views: 715

Re: Porting Marlin to STM32.

i'm not too sure if using RepRap Firmware may be easier to port as it is targetted on ARM and that it is organised around c++ classes http://reprap.org/wiki/RepRap_Firmware accordingly it is a derivative of marlin however, i'd think RepRap_Firmware codes itself possibly somewhat more complex given t...
by ag123
Sat Jul 01, 2017 7:18 pm
Forum: Projects
Topic: Porting Marlin to STM32.
Replies: 32
Views: 715

Re: Porting Marlin to STM32.

found a video and a discussion thread on reprap marlin forums
https://translate.google.com/translate? ... 7%2C702090

this is based on RAMPS-FD (for Due 3.3v)
https://youtu.be/yWifSMP6Kdw