Search found 824 matches

by ag123
Fri Jan 12, 2018 5:38 pm
Forum: Projects
Topic: Alternative USB Discovery Circuit
Replies: 3
Views: 164

Re: Alternative USB Discovery Circuit

i think maple mini (and clones) has something similar https://github.com/leaflabs/maplemini/blob/master/maplemini.pdf i never quite examined it closely, but now i noted that there are 2 transistors which could be used to disable the D+ pull up to VCC (which interestingly is 3.3v). This seem to work ...
by ag123
Sun Jan 07, 2018 8:28 pm
Forum: General discussion
Topic: analog watchdog in adc
Replies: 4
Views: 134

Re: analog watchdog in adc

actually i'm looking for a comparator and in stm32f103, the simple analog comparator isn't there. instead st substituted the comparator with 2 digital threshold comparators hide it in the adc and called it 'analog watchdog', that sounds good as well :lol: a conventional LC meter circuit based on the...
by ag123
Sun Jan 07, 2018 8:21 am
Forum: General discussion
Topic: analog watchdog in adc
Replies: 4
Views: 134

analog watchdog in adc

https://jeelabs.org/article/1619b/
Image
it seemed to be there in stm32f103 (i.e. all the BP & MM etc), has anyone played with it?
it seemed like an underutilised useful stuff
:D
by ag123
Sat Jan 06, 2018 2:26 pm
Forum: Off topic
Topic: Linux Journal
Replies: 43
Views: 783

Re: Linux Journal

by ag123
Sat Jan 06, 2018 10:00 am
Forum: Projects
Topic: Temperature logger with Bluepill, microSD card and DS18B20
Replies: 9
Views: 314

Re: Temperature logger with Bluepill, microSD card and DS18B20

i used 1 of those 10,000 mah LIPO power bank, last 'forever' in my use case hardly switched on, occasional logging, last for ages, recharge once in a while, place VBAT on a coin cell keeps the rtc running literally perpetually :mrgreen: https://www.ebay.com/sch/i.html?_nkw=powerbank&_sacat=0 i'm thi...
by ag123
Fri Jan 05, 2018 9:48 am
Forum: General discussion
Topic: Happy New Year for 2018
Replies: 16
Views: 334

Re: Happy New Year for 2018

i'm late but Happy New Year all :D
by ag123
Fri Jan 05, 2018 5:13 am
Forum: Off topic
Topic: Meltdown and Spectre - Cortex M3 M4 not affected
Replies: 3
Views: 307

Re: Meltdown and Spectre - Cortex M3 M4 not affected

my guess is with 20k ram there isn't enough room for meltdown or spectre to live alongside the sketch as well :lol:
by ag123
Sat Dec 23, 2017 4:56 am
Forum: STM32F103 Boards
Topic: Timer setup
Replies: 4
Views: 247

Re: Timer setup

i think the 'old' timer examples from the original leaflabs documents still works
http://docs.leaflabs.com/docs.leaflabs.com/index.html
http://docs.leaflabs.com/static.leaflab ... dwaretimer
by ag123
Sat Dec 23, 2017 12:57 am
Forum: General discussion
Topic: Need advise on logic analyser
Replies: 20
Views: 1169

Re: Need advise on logic analyser

i've been thinking that the stm32f407ve boards e.g. the black f4 etc would make pretty good logic analysers and oscilloscopes fast cpu speeds and decent amount of on chip memory a google search turned these up https://www.fussylogic.co.uk/blog/?p=1226 https://www.youtube.com/watch?v=uD3_PqbAgV0 and ...
by ag123
Wed Dec 20, 2017 4:06 pm
Forum: Projects
Topic: STM32 OTA on Arduino IDE for STM32-Arduino and STM32GENERIC repo
Replies: 20
Views: 539

Re: STM32 OTA on Arduino IDE for STM32-Arduino and STM32GENERIC repo

thanks and oh ok here come's stm's own nrf51822 competitor - BlueNRG2 http://www.st.com/content/st_com/en/products/wireless-connectivity/bluetooth-bluetooth-low-energy/bluenrg-2.html the wireless competition is certainly heating up unfortunately that evaluation board is tad bulky (compared to maple ...