Hi there,
I am doing a project on an ESP8266 (Wemos D1 mini) and the digital output pins (3.3v, 12mA) go high during boot phase for around 100ms. The problem is I'd like to use these pins to drive three relays which switches onward processes - however the onward process only needs a brief connection on the relays to do the onward processes.
The problem is, as said, whilst the pins are normally low, they go high during boot up which would ultimately trigger my project - in this case, a garage door, to open, or close, or end up somewhere I don't want it to be. I was thinking of ways to overcome, perhaps by introducing a resistor and capacitor which would absorb 200ms or so of output so it wouldn't trigger on boot, however would work (albeit it with a small delay - not a problem) during normal use as I would just hold the pin high for a longer period.
Can anyone help me with the formula to derive a capacitor and accommodating resistor size (if needed), if this is a suitable solution?
Thanks
* Other solutions very much welcome.
Dan
I am doing a project on an ESP8266 (Wemos D1 mini) and the digital output pins (3.3v, 12mA) go high during boot phase for around 100ms. The problem is I'd like to use these pins to drive three relays which switches onward processes - however the onward process only needs a brief connection on the relays to do the onward processes.
The problem is, as said, whilst the pins are normally low, they go high during boot up which would ultimately trigger my project - in this case, a garage door, to open, or close, or end up somewhere I don't want it to be. I was thinking of ways to overcome, perhaps by introducing a resistor and capacitor which would absorb 200ms or so of output so it wouldn't trigger on boot, however would work (albeit it with a small delay - not a problem) during normal use as I would just hold the pin high for a longer period.
Can anyone help me with the formula to derive a capacitor and accommodating resistor size (if needed), if this is a suitable solution?
Thanks
* Other solutions very much welcome.
Dan