ESP8266 Community Forum

- Fri Apr 08, 2016 11:51 am #45116 The above circuit should work well, the only thing is that it is not showing a pullup on RES.

Maybe you've done a mistake in the wiring ...

- Fri Apr 08, 2016 2:56 pm #45129 What value should have the pullup, 10K ?
I will check the wires and I hope I miss something

Thank you

- Fri Apr 08, 2016 11:57 pm #45146 Hi,

In the attachment picture I have the circuit:

Yellow wire it's going to ESP's pin RST
Blue wire it's the signal ... to simulate an alarm I put it on +3.3V, the circuit is working, the RST pin is going to ground for a few milliseconds and the ESP is resetting. After the "alarm" if I put it again to +3.3v the ESP it's not resetting.

To make it work again I must put the blue wire to discharge the capacitor (on the red arrow or at GND) .. this is like an "reactivating" the system after an alarm.

If I pull up the capacitor and +3.3v is present in the gate the transistor is keeping the RST pin to ground as long as the power exists in the gate (in this situation the ESP is resetting only after the alarm)

I simullated the circuit on Proteus and the same result

thank you

Attachments

- Tue Apr 12, 2016 1:29 am #45323 Problem solved! Because I tested the circuit with a 100nF the discharge of the cap is taking too long so I put a 1M resistor between the capacitor and the ground to discharge it more quickly.