Search found 714 matches

by ag123
Fri Sep 22, 2017 12:17 am
Forum: Ideas & suggestions
Topic: Differential ADC (ADC1-ADC2)
Replies: 12
Views: 249

Re: Differential ADC (ADC1-ADC2)

on this topic about noise, in part as i use low pass filtering, i've inherently 'escaped' some of the noise issues. ecg signals are in the low orders of 5 hz - 40 hz (accordingly the range do extend upwards to say 50hz or somewhat more but of low amplitude), nevertheless low pass filtering set at 40...
by ag123
Thu Sep 21, 2017 3:12 pm
Forum: Projects
Topic: Anyone tried to make a 3D Printer controller?
Replies: 247
Views: 18655

Re: Anyone tried to make a 3D Printer controller?

i'm halfway wondering if marlin or more correctly both marlin and 'gcode senders' if there are any desktop 'g-code sender' that routes g-codes to multiple 3d printer controllers i found at least this http://winder.github.io/ugs_website/ but i'm not too sure if the more popular variants e.g. http://o...
by ag123
Thu Sep 21, 2017 2:25 pm
Forum: Ideas & suggestions
Topic: Differential ADC (ADC1-ADC2)
Replies: 12
Views: 249

Re: Differential ADC (ADC1-ADC2)

thinking through this it would seem this differential adc could help remove some of that common mode noise, i could feed that ad8232 output into 2 ADCs and perhaps it may remove some of that artefact spikes :?
by ag123
Thu Sep 21, 2017 1:40 pm
Forum: Ideas & suggestions
Topic: Differential ADC (ADC1-ADC2)
Replies: 12
Views: 249

Re: Differential ADC (ADC1-ADC2)

oh well, i actually messed with this: https://www.sparkfun.com/products/12650 and of course there are cheaper 'knock offs' from here: https://www.ebay.com/sch/i.html?_from=R40&_sacat=0&_nkw=ad8232&_sop=15 (think the 'cheap' ones may not be as safe it's good to measure the resistances of the smd resi...
by ag123
Thu Sep 21, 2017 12:31 pm
Forum: General discussion
Topic: short on VBAT?
Replies: 5
Views: 145

Re: short on VBAT?

Btw, MMinis do not have 32kHz RTC crystal mounted, how did you wire it? thanks pito, this is tad ugly but it here is the hack, guess it's about time i solder a new MM :lol: https://i.imgur.com/aWySYZg.jpg looks ilke that huge blob of solder at the crystal joints looks pretty bad, would probably nee...
by ag123
Thu Sep 21, 2017 12:29 am
Forum: General discussion
Topic: short on VBAT?
Replies: 5
Views: 145

Re: short on VBAT?

thanks pito ! it seemed the coin cell which has already drained to 1.5v is possibly completely drained, as measuring it across when connected to VBAT - GND gives 0 v, i think you are right about the clamping diodes. i'd use a new coin cell and possibly connect a small series resistor and measure vol...
by ag123
Tue Sep 19, 2017 4:36 pm
Forum: Code snipplets
Topic: Waveform Generator (Two DAC examples)
Replies: 23
Views: 7854

Re: Waveform Generator (Two DAC examples)

this is itching me to try out the DAC on the stm32f407vet6 black boards :lol:
by ag123
Tue Sep 19, 2017 4:16 pm
Forum: General discussion
Topic: short on VBAT?
Replies: 5
Views: 145

short on VBAT?

recently i tried to meddle with RTC on my Baite MM clone, RTC 'simply works' thanks much for the really good effort here. then i hooked up a CR3032 coin cell on VBAT pin on the MM, it seemed to run quite well initially keeping the clock going after removing USB power. after less than a month the CR3...
by ag123
Thu Sep 07, 2017 12:55 pm
Forum: General discussion
Topic: BluePill on Hackaday again
Replies: 4
Views: 240

Re: BluePill on Hackaday again

actually i think hackaday should feature our 3 different arduino cores libmaple, stm32generic and stm's very own stm32duino core
it is probably one platform with concurrent 3 different cores that you can choose
:lol:
by ag123
Thu Sep 07, 2017 12:46 pm
Forum: General discussion
Topic: Graphing calculator feat. STM32F412VGT6
Replies: 25
Views: 532

Re: Graphing calculator feat. STM32F412VGT6

our stm32duino calculator does a different feat, it isn't quite that beautiful but maybe it is possible to draw an fft chart on an ili9341 what our stm32duino calculator excel at is that it can crunch floating point numbers at 500 mflops - no other beautiful stm32 f4 calculators may come close, but ...