Forum: General Electronics Technical Discussion
01-03-2021, 06:21 PM
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Replies: 178
Views: 4,566
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Forum: General Electronics Technical Discussion
01-03-2021, 07:13 AM
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Replies: 178
Views: 4,566
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Forum: General Electronics Technical Discussion
12-15-2020, 03:22 PM
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Replies: 178
Views: 4,566
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Forum: General Electronics Technical Discussion
12-15-2020, 10:56 AM
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Replies: 178
Views: 4,566
Re: Remote pump control ideas.
use a 12v psu - easy to get.
then add a 5v regulator for the electronics.
ideally a linear one using a 7805 for long term reliability.
not that i dont trust buck convertors - but they do have more...
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Forum: General Electronics Technical Discussion
11-02-2020, 01:03 PM
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Replies: 178
Views: 4,566
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Forum: General Electronics Technical Discussion
11-02-2020, 09:51 AM
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Replies: 178
Views: 4,566
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Forum: General Electronics Technical Discussion
11-02-2020, 05:35 AM
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Replies: 178
Views: 4,566
Re: Remote pump control ideas.
instead of the optocoupler you could use a darlington driver like a ULN2803
https://www.ti.com/product/ULN2803A
these have been used in gambling machines for a couple of decades to link the...
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Forum: General Electronics Technical Discussion
10-31-2020, 12:40 PM
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Replies: 178
Views: 4,566
Re: Remote pump control ideas.
hardwire it to 3v3 at the regulator (for max current) and see if you can blow out the shorted gate.
nothing to lose trying! :D
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Forum: General Electronics Technical Discussion
10-31-2020, 08:49 AM
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Replies: 178
Views: 4,566
Re: Remote pump control ideas.
well if you are sure it's the chip holding it's own reset line down.
btw, a bit of a bodge, but try adding a pullup resistor to 3v3
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Forum: General Electronics Technical Discussion
10-31-2020, 04:01 AM
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Replies: 178
Views: 4,566
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Forum: General Electronics Technical Discussion
10-28-2020, 12:36 PM
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Replies: 178
Views: 4,566
Re: Remote pump control ideas.
what the hell is that diagram?
why are you using a schmit trigger anyway?
i think later i'll have to do a diagram myself! :D
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Forum: General Electronics Technical Discussion
10-28-2020, 10:18 AM
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Replies: 178
Views: 4,566
Re: Remote pump control ideas.
i dont know about your desk, but you need to be carefull with these type of large explosed boards - put them on/in a case or something
you may want to run your inputs through opto islolators on the...
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Forum: General Electronics Technical Discussion
10-28-2020, 08:11 AM
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Replies: 178
Views: 4,566
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Forum: General Electronics Technical Discussion
10-27-2020, 11:58 AM
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Replies: 178
Views: 4,566
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Forum: General Electronics Technical Discussion
10-27-2020, 05:21 AM
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Replies: 178
Views: 4,566
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Forum: General Electronics Technical Discussion
10-27-2020, 02:57 AM
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Replies: 178
Views: 4,566
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Forum: General Electronics Technical Discussion
10-26-2020, 03:14 PM
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Replies: 178
Views: 4,566
Re: Remote pump control ideas.
i think if you put a 1n4148 diode between the mcu and relay you should be good.
it will block the 12v through the lamp from the mcu
if that even happens.
i have some led indicators that dont...
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Forum: General Electronics Technical Discussion
10-26-2020, 12:44 PM
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Replies: 178
Views: 4,566
Re: Remote pump control ideas.
wtf?
use the relay to pull to ground,
out the led & resistor(2k2) to +12v or use 5v and 470ohm or higher
the microcontroller has internal pullups
btw - your circuit will blow the led to bits -...
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Forum: General Electronics Technical Discussion
10-25-2020, 02:19 PM
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Replies: 178
Views: 4,566
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Forum: General Electronics Technical Discussion
10-25-2020, 07:29 AM
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Replies: 178
Views: 4,566
Re: Remote pump control ideas.
that's not how it's done,
you have a main loop that branches to each task.
tasks like checking buttons, checking sensors etc.
none of the tasks go into a closed loop.
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Forum: General Electronics Technical Discussion
10-24-2020, 03:28 PM
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Replies: 178
Views: 4,566
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Forum: General Electronics Technical Discussion
10-23-2020, 07:14 AM
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Replies: 178
Views: 4,566
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Forum: General Electronics Technical Discussion
10-23-2020, 04:21 AM
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Replies: 178
Views: 4,566
Re: Remote pump control ideas.
lol
did you go to my link to check your stlink is up to date?
btw, you can move a couple of jumpers on the stlink part and use it standalone to program other stm32 chips. :)
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Forum: General Electronics Technical Discussion
10-22-2020, 03:33 AM
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Replies: 178
Views: 4,566
Re: Remote pump control ideas.
power can be reduced to nothing,
you can shutdown the i/o in blocks so only the core runs, and even change the clockspeed on the fly.
you can also stall the core and have it start on an interupt...
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Forum: General Electronics Technical Discussion
10-21-2020, 12:39 PM
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Replies: 178
Views: 4,566
Re: Remote pump control ideas.
https://www.carminenoviello.com/2016/01/22/getting-started-stm32-nucleo-f746zg/
thid guy is a master - he writes books on this stuff
and this link should be bookmarked - it's the firmware...
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