Electronics > Beginners
How to add soft-start feature to a PSU?
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Arjunan M R:
Yes, it's cheaper than arduino.
Siwastaja:

--- Quote from: Arjunan M R on June 23, 2019, 10:13:59 am ---Yeah , but then I have to buy the programmer

--- End quote ---

$1.42:
https://www.ebay.com/itm/USB-To-RS232-TTL-UART-PL2303HX-Auto-Converter-USB-to-COM-Cable-Adapter-Module/201539573206?hash=item2eecb1d5d6:g:sUoAAOSwyXVbaQjC

(using the bootloader. I have never used anything else than the built-in UART bootloader, or my own bootloaders written later. This is just fine, ignore the naysayers.)


--- Quote ---learn how to programm it.

--- End quote ---

This is true, there's quite a bit of learning curve involved. The bright side is, it's going to be a very universal skill, over wide range of projects.

I jumped in the STM32 world (from 8-bit AVR) by directly designing it in in an actual customer project and promising delivery in one month :-DD. Funny times. In the end, the customer was satisfied despite delays (took two months to have anything work at all), and I learned a lot, but it happened quickly, and with the customer, we designed a proper V2 (using STM32 as well) a year later, with more realistic schedules.
TheHolyHorse:

--- Quote from: Arjunan M R on June 23, 2019, 10:13:59 am ---
--- Quote from: TheHolyHorse on June 23, 2019, 10:09:23 am ---
--- Quote from: Arjunan M R on June 23, 2019, 08:03:50 am ---
--- Quote from: exe on June 23, 2019, 07:29:10 am ---As for MCU, for my PSU I chose stm32f373 as it has three DACs and and two or so 16bit ADC (datasheet claims 14bits noise-free). This way I reduced BOM, and avoided i2c/spi devices (and writing drivers for them). But I'm yet to finish the project, so not sure how the MCU is good for the job.

--- End quote ---
Stm32 is expensive.
I will stick with what i have to keep the cost down.

--- End quote ---

Well not really, the STM32F373 cost less than MCP3421A0T-ECH and MCP4922 combined and you'll get everything in one package. And as exe stated higher precision SDADC and IIRC the internal DACs are also better.

--- End quote ---
Yeah , but then I have to buy the programmer and learn how to programm it.

--- End quote ---

You can just plug in the usb download the DFU tool from st and flash it real easy. As for the programming it will probably be a bit more complicated, but that all depends on programming experience. The arduino will by far be easier, so if you're more comfortable with that go for it.
TheHolyHorse:

--- Quote from: Siwastaja on June 23, 2019, 10:18:26 am ---
--- Quote from: Arjunan M R on June 23, 2019, 10:13:59 am ---Yeah , but then I have to buy the programmer

--- End quote ---

$1.42:
https://www.ebay.com/itm/USB-To-RS232-TTL-UART-PL2303HX-Auto-Converter-USB-to-COM-Cable-Adapter-Module/201539573206?hash=item2eecb1d5d6:g:sUoAAOSwyXVbaQjC


--- End quote ---

You don't have to buy anything but a usb connector for like 0.4€ :)
Siwastaja:
Yeah, some indeed have the USB bootloader. UART works for the smaller STM32's not equipped with the USB peripheral or factory bootloader functionality for it.
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