- Thu Jul 21, 2016 3:15 pm
#51210
Anyway that isn't happening I will wait till I get some 12e's any other methods for saving battery life.
Moderator: igrr
- Thu Jul 21, 2016 3:18 pm
#51212
Hi when I did mine I soldered to the reset pin first - then tinned the other end of the resistor leaving a small blob of solder on the end of the wire - bent this round to the ESP and heated about 1/2" away from the ESP and let the heat travel down the wire to the pad.
It worked better than I expected.
But +1 on the 8266-12s, thats all I use now. I have a little 3D printed adapter that I use if I need ot refit an 8266-01.
It worked better than I expected.
But +1 on the 8266-12s, thats all I use now. I have a little 3D printed adapter that I use if I need ot refit an 8266-01.
- Thu Jul 21, 2016 3:24 pm
#51213
Cool I will try that now, good thinking. RE the 3d printed adapter is there an stl anywhere for it I have a few 3d printers. Defo going to buy 12es from now on. Do you have a photo of the end result of your hacked esp?
- Thu Jul 21, 2016 3:40 pm
#51216
@barnabybear: it is not as easy as that.
what limits the resitor on upper level? (for easy of demonstartion I assume perfect gpios)
If you have a 10k pullup on rst and choose a 10k to gpio16, when gpio goes low it builds an 10k/10k voltage divider leaving 3.3V/2 on rst, no reliable value for low ...
1k seems ok, giving a 1/11 ratio, 0.3V being a reliable low...
and for the lower level? consider having a 220Ohm between rst and gpio16,
if gpio16 is high, what R would be needed to connect external reset (needed for same reason as to gpio16)?
even 220Ohm would be too high, giving 220:220 ratio == 3.3V/2 as in first example.
So: it is not just preventing an overload of gpios (most likely they are current limited on cmos) but a delicate balance depending on the rest of the circuit.
A diode (low drop, cathode to gpio16) is easier, no calculation needed and allmost allways safe if it's not foreseen to apply vcc directly to rst.
what limits the resitor on upper level? (for easy of demonstartion I assume perfect gpios)
If you have a 10k pullup on rst and choose a 10k to gpio16, when gpio goes low it builds an 10k/10k voltage divider leaving 3.3V/2 on rst, no reliable value for low ...
1k seems ok, giving a 1/11 ratio, 0.3V being a reliable low...
and for the lower level? consider having a 220Ohm between rst and gpio16,
if gpio16 is high, what R would be needed to connect external reset (needed for same reason as to gpio16)?
even 220Ohm would be too high, giving 220:220 ratio == 3.3V/2 as in first example.
So: it is not just preventing an overload of gpios (most likely they are current limited on cmos) but a delicate balance depending on the rest of the circuit.
A diode (low drop, cathode to gpio16) is easier, no calculation needed and allmost allways safe if it's not foreseen to apply vcc directly to rst.
