Search found 1650 matches

by victor_pv
Thu Oct 19, 2017 8:31 pm
Forum: Off topic
Topic: Making your own pcb's.
Replies: 11
Views: 317

Re: Making your own pcb's.

That idea doesn't seem so mad to me... it makes sense. You dont even need an oven, or a functional one to start with, just a good enough enclosure.
I'll do some search in google to see if someone has experimented with that.
by victor_pv
Thu Oct 19, 2017 6:36 pm
Forum: Off topic
Topic: Making your own pcb's.
Replies: 11
Views: 317

Re: Making your own pcb's.

Reviving this old thread since it's all related.

Does anyone has link to a good cheap solder paste syringe for a few boards?

And has anyone successfully made a reflow oven out of a toaster oven?

I'm about to try the skillet method, but don't want to "cook" the boards if there is some better way...
by victor_pv
Wed Oct 18, 2017 6:40 pm
Forum: Libraries & Hardware
Topic: Is anyone interested in helping to make an Arduino Due which uses [edited:] a 100-pin STM32L471
Replies: 89
Views: 1519

Re: Is anyone interested in helping to make an Arduino Due which uses [edited:] a 100-pin STM32L471

I saw this stm32 version, but may not be for the F030:
https://github.com/x893/CMSIS-DAP

May give you a head start if you can't find an F030 version. Not sure how large
by victor_pv
Wed Oct 18, 2017 4:15 pm
Forum: Projects
Topic: F405 & F411 versions of the BluePill
Replies: 207
Views: 2360

Re: F405 & F411 versions of the BluePill

http://wiki.stm32duino.com/index.php?title=Blue_Pill pinout's towards the bottom. i did the analysis a couple days ago: for pin-compatibility / interoperability with pre-existing bluepill shields there is no other option but to use this particular pin as GPIO. right at the beginning of the thread (...
by victor_pv
Wed Oct 18, 2017 3:59 pm
Forum: Projects
Topic: F405 & F411 versions of the BluePill
Replies: 207
Views: 2360

Re: F405 & F411 versions of the BluePill

Regarding the 1k resistor, if it's planned between the USB ID pin and the header pad, then it would not affect if the user doesn't use USB on the go. Something like (where the dashes is the electrical connection): USB ID PIN------1k------header_pin------MCU PIN. If nothing is connected in the USB co...
by victor_pv
Wed Oct 18, 2017 3:16 pm
Forum: Libraries & Hardware
Topic: Is anyone interested in helping to make an Arduino Due which uses [edited:] a 100-pin STM32L471
Replies: 89
Views: 1519

Re: Is anyone interested in helping to make an Arduino Due which uses [edited:] a 100-pin STM32L471

There is cmsis-dap, which I understand is open source and similar capabilities to ST-Link.
I have seen it used in some Nucleo clones coming from China, but can't confirm if it provides the exact same capabilities (debugging, serial, mass storage).
by victor_pv
Tue Oct 17, 2017 4:52 pm
Forum: Custom design boards
Topic: Alternative BluePill sized F4
Replies: 14
Views: 206

Re: Alternative BluePill sized F4

Racemaniac, this article from Linear can provide some information on using several LDOs to share the load: http://www.linear.com/solutions/5759 About voltage regulators, I just noticed this one in Mouser, listed as new: LDL1117S33R Only 250uA quiescent current, and 350mV dropout Still the AP2114 Squ...
by victor_pv
Sun Oct 15, 2017 12:31 am
Forum: Projects
Topic: F405 & F411 versions of the BluePill
Replies: 207
Views: 2360

Re: F405 & F411 versions of the BluePill

From the 405/407 reference manual, section 34.3.2: Pull-up/pull-down resistor ECN circuit. The DP pull-up consists of 2 resistors controlled separately from the OTG_FS as per the resistor Engineering Change Notice applied to USB Rev2.0. The dynamic trimming of the DP pull-up strength allows for bett...
by victor_pv
Sat Oct 14, 2017 7:03 pm
Forum: Code snipplets
Topic: Unique device ID (and flash size)
Replies: 18
Views: 4463

Re: Unique device ID (and flash size)

In fact if the MCU is "STM32F103CB" as you wrote, that should have 128KB according to the specs. The STM32F103C8 (note is a number 8 not upper case b) is supposed to have only 64KB. So if you have a CB with 128KB, you are exactly within specs. If you have a C8 with 128Kb, then as Dannyf pointed is c...