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by ddrown
Fri Jan 13, 2017 3:09 am
Forum: General discussion
Topic: PPM sensor using the timer.
Replies: 3
Views: 96

Re: PPM sensor using the timer.

sashmich wrote:Thanks. As I understand it is a problem.


Yeah, I found it easier to use STM32CubeMX to do input capture
by ddrown
Thu Jan 12, 2017 3:02 am
Forum: Custom design boards
Topic: STM32F030 custom board
Replies: 15
Views: 668

Re: STM32F030 custom board

Adding some more filtering to the Vref value (average of 1024 seconds of data collected 1/second) and comparing it to temperature is interesting: https://dan.drown.org/rpi/temp/vref-temp.png The full vref axis on that graph is 1.8mV, which is just over 2 LSB (+1 count@3.3V = 0.8mV) of the ADC! That'...
by ddrown
Wed Jan 11, 2017 4:05 am
Forum: General discussion
Topic: PPM sensor using the timer.
Replies: 3
Views: 96

Re: PPM sensor using the timer.

This thread has some relevant info: http://www.stm32duino.com/viewtopic.php?f=3&t=1029
by ddrown
Wed Jan 11, 2017 3:56 am
Forum: Projects
Topic: Neopixel christmas lights
Replies: 17
Views: 256

Re: Neopixel christmas lights

Which digital LED strip did you use? Looking on eBay and AliExpress there seems to be a lot of different types available. But its hard to tell. Do you have any recommendations ? I bought mine off Amazon, but it shipped from China: https://www.amazon.com/gp/product/B00B4UKG2W/ref=oh_aui_detailpage_o...
by ddrown
Tue Jan 10, 2017 5:30 pm
Forum: Projects
Topic: Neopixel christmas lights
Replies: 17
Views: 256

Re: Neopixel christmas lights

racemaniac wrote:should be fixed now. entered the wrong portnumber >_<


Yup, it works now. Those are fun christmas lights, what are you using for your controller?
by ddrown
Tue Jan 10, 2017 2:53 am
Forum: Custom design boards
Topic: STM32F030 custom board
Replies: 15
Views: 668

Re: STM32F030 custom board

To investigate temperature measurements in more detail, I setup a blue pill to sample the internal Vref, the internal Temperature sensor, and a TMP36 (10mV/C analog sensor) on PA0 every second and log it via USB serial. This data is averaged over 60 seconds worth of samples. https://dan.drown.org/rp...
by ddrown
Fri Jan 06, 2017 4:35 pm
Forum: Libraries & Hardware
Topic: Ethernet_STM + W5500: maximum parallel connections from same client
Replies: 12
Views: 166

Re: Ethernet_STM + W5500: maximum parallel connections from same client

--- Socket status --- Socket 0 is ESTABLISHED, port: 80, D: 192.168.100.51(58222), RX: 0 Socket 1 is ESTABLISHED, port: 80, D: 192.168.100.51(58223), RX: 371 Socket 2 is CLOSED, port: 80, D: 192.168.100.51(57950), RX: 0 Socket 3 is CLOSED, port: 80, D: 192.168.100.51(58096), RX: 0 <--- client end. ...
by ddrown
Thu Dec 08, 2016 10:41 pm
Forum: Maple mini
Topic: I2C hardwire library communication between 2 (two) stm32 maple mini
Replies: 12
Views: 275

Re: I2C hardwire library communication between 2 (two) stm32 maple mini

I'm not sure if this will help you because it isn't Arduino, but I have a code example for an i2c slave for STM32CubeMX: https://github.com/ddrown/stm32-output-pps/blob/master/Src/i2c_slave.c I chose a very simple slave protocol, when the master signals a read, it just writes all registers out (the ...
by ddrown
Wed Nov 16, 2016 4:34 pm
Forum: Custom design boards
Topic: STM32F030 custom board
Replies: 15
Views: 668

Re: STM32F030 custom board

Pretty impressive results. Which TCXO did you use? Where did you source it? I used this one from digikey: https://www.digikey.com/product-detail/en/abracon-llc/ASTX-H11-12.000MHZ-T/535-12043-1-ND/3907423 Part of this result is from the narrow temperature range it experienced. Quick temperature chan...
by ddrown
Wed Nov 16, 2016 5:27 am
Forum: Custom design boards
Topic: STM32F030 custom board
Replies: 15
Views: 668

Re: STM32F030 custom board

Checking back in after running this board for over a month now. After the strange second week, the frequency stabilized. I'm thinking it was an affect of aging. Below is a graph of frequency error averaged over every 16 second interval https://dan.drown.org/stm32/tcxo-1month/tcxo-16s.png And the nex...

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