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Forum Index : Microcontroller and PC projects : Offerings to the Raspberry Gods

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Rickard5

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Joined: 31/03/2022
Location: United States
Posts: 463
Posted: 06:41pm 23 Jul 2022
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Everything is Smoke Machine if you use it improperly long enough. Last night I was trying to figure out driving  L298N Dual H Bridge Motor Driver Boards I gave up another sacrificial offering to the our Raspberry Overlords
on the upside it's only a $4.00 loss, but I got to either build up some bigger BADDER Bridge Drivers or quit using old DeFault drill motor Motors and gear Reductions



I may be Vulgar, but , while I'm poor, I'm Industrious, Honest,  and trustworthy! I Know my Place
 
Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 7937
Posted: 08:37pm 23 Jul 2022
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Where has that come from? The inputs to the bridge drivers are only low current logic level, they don't draw any current. Of course, if you are trying to put motor current through that pcb...

As the logic supply for those bridge drivers should be 5V I'd want to put level shifters between the PicoMite and the bridge anyway.
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
Rickard5

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Joined: 31/03/2022
Location: United States
Posts: 463
Posted: 08:44pm 23 Jul 2022
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  Mixtel90 said  Where has that come from? The inputs to the bridge drivers are only low current logic level, they don't draw any current. Of course, if you are trying to put motor current through that pcb...

As the logic supply for those bridge drivers should be 5V I'd want to put level shifters between the PicoMite and the bridge anyway.

I was only running 5v logic voltage though the H-Bridge, until I ran way too much Amperage though the Bridge and and everything went poof :) and 12V got mixed in the 5v logic is my guess
I may be Vulgar, but , while I'm poor, I'm Industrious, Honest,  and trustworthy! I Know my Place
 
Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 7937
Posted: 08:59pm 23 Jul 2022
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Ah... not good. Release of the Magic Smoke prevents things from working.

Opto-coupling?
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
Rickard5

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Joined: 31/03/2022
Location: United States
Posts: 463
Posted: 10:49pm 23 Jul 2022
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  Mixtel90 said  Ah... not good. Release of the Magic Smoke prevents things from working.


Not to worry I have a few bottles of smoke left over '70 BSA 441 Victor I had in the 80's






British Pico must run on British replacement Smoke :)
I may be Vulgar, but , while I'm poor, I'm Industrious, Honest,  and trustworthy! I Know my Place
 
Volhout
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Joined: 05/03/2018
Location: Netherlands
Posts: 5089
Posted: 10:57pm 23 Jul 2022
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Too bad Richard ypu did not put the series resistors in the signal lines for the bridge...working fast ... costs money...

Volhout
PicomiteVGA PETSCII ROBOTS
 
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