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Search: Posts Made By: stj
Forum: General Electronics Technical Discussion 01-03-2021, 06:21 PM
Replies: 178
Views: 4,566
Posted By stj
Re: Remote pump control ideas.

lol
yea, been there - done that!
nothing better than having to put loads of caps and resistors back!
Forum: General Electronics Technical Discussion 01-03-2021, 07:13 AM
Replies: 178
Views: 4,566
Posted By stj
Re: Remote pump control ideas.

nice - getting the pins aligned must have been a bitch! :D
Forum: General Electronics Technical Discussion 12-15-2020, 03:22 PM
Replies: 178
Views: 4,566
Posted By stj
Re: Remote pump control ideas.

78s05 can supply 1.5-2A

so how much current at 5v do you actually need?
Forum: General Electronics Technical Discussion 12-15-2020, 10:56 AM
Replies: 178
Views: 4,566
Posted By stj
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...
Forum: General Electronics Technical Discussion 11-02-2020, 01:03 PM
Replies: 178
Views: 4,566
Posted By stj
Re: Remote pump control ideas.

dont overthink it - a common ground will exist
Forum: General Electronics Technical Discussion 11-02-2020, 09:51 AM
Replies: 178
Views: 4,566
Posted By stj
Re: Remote pump control ideas.

i'm suggesting the 2803 for outputs :D
Forum: General Electronics Technical Discussion 11-02-2020, 05:35 AM
Replies: 178
Views: 4,566
Posted By stj
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...
Forum: General Electronics Technical Discussion 10-31-2020, 12:40 PM
Replies: 178
Views: 4,566
Posted By stj
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
Forum: General Electronics Technical Discussion 10-31-2020, 08:49 AM
Replies: 178
Views: 4,566
Posted By stj
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
Forum: General Electronics Technical Discussion 10-31-2020, 04:01 AM
Replies: 178
Views: 4,566
Posted By stj
Re: Remote pump control ideas.

there is no programming for the main chip, only the stlink mcu has code on it.
(and i have that! :) )
Forum: General Electronics Technical Discussion 10-28-2020, 12:36 PM
Replies: 178
Views: 4,566
Posted By stj
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
Forum: General Electronics Technical Discussion 10-28-2020, 10:18 AM
Replies: 178
Views: 4,566
Posted By stj
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...
Forum: General Electronics Technical Discussion 10-28-2020, 08:11 AM
Replies: 178
Views: 4,566
Posted By stj
Re: Remote pump control ideas.

check the schematics to see where it goes - i think it's linked to the stlink mcu
Forum: General Electronics Technical Discussion 10-27-2020, 11:58 AM
Replies: 178
Views: 4,566
Posted By stj
Forum: General Electronics Technical Discussion 10-27-2020, 05:21 AM
Replies: 178
Views: 4,566
Posted By stj
Re: Remote pump control ideas.

what os you running on the laptop?
Forum: General Electronics Technical Discussion 10-27-2020, 02:57 AM
Replies: 178
Views: 4,566
Posted By stj
Re: Remote pump control ideas.

yes, anode to mcu input you can also use a series resistor to limit the current to the limit of the pin if you want.
Forum: General Electronics Technical Discussion 10-26-2020, 03:14 PM
Replies: 178
Views: 4,566
Posted By stj
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...
Forum: General Electronics Technical Discussion 10-26-2020, 12:44 PM
Replies: 178
Views: 4,566
Posted By stj
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 -...
Forum: General Electronics Technical Discussion 10-25-2020, 02:19 PM
Replies: 178
Views: 4,566
Posted By stj
Re: Remote pump control ideas.

i was avoiding interupt based stuff :)
Forum: General Electronics Technical Discussion 10-25-2020, 07:29 AM
Replies: 178
Views: 4,566
Posted By stj
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.
Forum: General Electronics Technical Discussion 10-24-2020, 03:28 PM
Replies: 178
Views: 4,566
Posted By stj
Re: Remote pump control ideas.

that's what multi-threading is, jumping between stuff so fast that nobody can tell :)
Forum: General Electronics Technical Discussion 10-23-2020, 07:14 AM
Replies: 178
Views: 4,566
Posted By stj
Re: Remote pump control ideas.

record speed compared to your AVR stuff then. :)
Forum: General Electronics Technical Discussion 10-23-2020, 04:21 AM
Replies: 178
Views: 4,566
Posted By stj
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. :)
Forum: General Electronics Technical Discussion 10-22-2020, 03:33 AM
Replies: 178
Views: 4,566
Posted By stj
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...
Forum: General Electronics Technical Discussion 10-21-2020, 12:39 PM
Replies: 178
Views: 4,566
Posted By stj
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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