- Sun Apr 29, 2018 12:38 pm
#75674
Thank you for this detailled answer.
I will try with shorter cables.
I will try with shorter cables.
- Sun Apr 29, 2018 9:18 pm
#75676
As I have said, cable length is a part of your problems. It alone may not be sufficient.
You may want to also add a larger capacitor at the ESP-07. 100uF minimum and up to 470uF. Keep the 22uF. As capacitors get larger in value they lose the ability to provide effective bypass at higher frequencies.
Some people have done tests on current consumption at different supply voltage, and they have found that operating the ESP at the top of it's voltage range (3.6 volts) results in higher current consumption. This is said to drain the battery faster than than operating it at 3.3 volts or lower. I have not performed similar tests, and I am going by what I remember. It would be worth checking into if battery run time is a concern.
You may want to also add a larger capacitor at the ESP-07. 100uF minimum and up to 470uF. Keep the 22uF. As capacitors get larger in value they lose the ability to provide effective bypass at higher frequencies.
Some people have done tests on current consumption at different supply voltage, and they have found that operating the ESP at the top of it's voltage range (3.6 volts) results in higher current consumption. This is said to drain the battery faster than than operating it at 3.3 volts or lower. I have not performed similar tests, and I am going by what I remember. It would be worth checking into if battery run time is a concern.
- Mon Apr 30, 2018 1:03 am
#75678
with a LiFePO4 that shouldn't be a problem. This cell can provide enogh current even over 10cm cable with a minimum of decoupling and no additional regulation.
This "mock-up" works flawlessly for over a year now; it was moved over from a breadboard that also worked flawless for over a year before with a ldo on a regular liIon.
So don't be more catholic than the pope...
This "mock-up" works flawlessly for over a year now; it was moved over from a breadboard that also worked flawless for over a year before with a ldo on a regular liIon.
So don't be more catholic than the pope...
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- Mon Apr 30, 2018 7:52 am
#75685
Because you have decent decoupling as close to the ESP8266 as you could.
The wire length is not in itself problem, proper decoupling/bypass is.
This cell can provide enough current even over 10cm cable with a minimum of decoupling and no additional regulation.
Because you have decent decoupling as close to the ESP8266 as you could.
The wire length is not in itself problem, proper decoupling/bypass is.
