I'm very new to eletctronic world. I have made a circuit using a ESP8622 That will go to another project with Arduino.
This little circuit has a connection to a Sensor that is powered on VIN and GND and return on another channel.
I forgot to turn it off when trying to find out a problem on the circuit and happened that the VIN and GND that goes to the sensor short circuited, and my ESP8266 almost died (fried on protective diode).
I searched but found nothing, I want to make some protection that could turn the power source OFF when something like that happens.
Is it possible ? Could somebody point me the way ?
The best protection is to learn to exercise caution when working on live circuits or changing connections. No matter what fix you come up with, there's always going to be another way something can fail. Take your time and get used to double checking everything.
That’s simple for me. I use a lab power supply that lets me set both the voltage and current. If the current exceeds the set point, the voltage drops back to limit the current to the set value. The voltage stays stable unless the current limit is surpassed.
Yes we can't overestimate how important this is. It can cause all sorts of problems like "latch up" this in effect causes high current to flow without actually having a short circuit. It just looks like one.
My comment is not directly related to your query but... I've cooked a board once when I accidentally touch the pins next to the reset button while trying to press the reset button and I had static electricity zap the board !! So now I always press the reset button with the eraser end of a pencil.
Yes. I will, however, cop to modifying live circuitry:
using jumpers which are serving where switches will be
jumping in an LED and series current limiting resistor
I think it is one of those "never" things we tell noobs, but we really mean it's best not to unless you know what you are doing and are always prepared to pay any consequences.
The rule should inform, at least in the back of one's mind, the design of the system. If powering down and up is so burdensome as to motivate one to take short cuts, there may be an opportunity to fix that.
Same with general testing. A good design and proper test recipes should mean not having to go to a great deal of trouble to get to the point where the test is applied.
I've used spare resources in unblocked code to stand up means to rapidly operate what otherwise would be human input just to get to the part where, e.g., returning from a deep submenu goes off the rails.
Back in the early 60's I was an industrial electrician in Canada's biggest steel mill. I once crawled under a moving steel ribbon big enough to make a whole car and grabbed the disconnected wires of one of the safety circuits. I twisted them together and got out. That wasn't even the most dangerous thing I did. I don't know why I survived.
Yeah, my fault. But a broken cable due to use time may also cause a short circujit. There's a lot of causes that may happen to cause it. just a simple protection is good not to loose the entire ESP. thanks.
Thought about that, will search about available fuses, but the circuit is small, I think that, if I put one, it would be the glass and I dont know if I can easily find here, will search for it, and if it will fit the space. The ESP has a diode that burned on the short. I could also put one of those protections, and substitute if it burn, but I know nothing about it. Will also search... thanks.
Yeah... my fault. I forgot. But this reminded me that I should put extra protection, on the case something else, that is not on my control, happens. I know only fuses, but if there's another kind of protection, I'll be glad to studdy about to see if it fits the project better. It is still in prototyping phase.
