- Fri Jul 03, 2015 3:47 pm
#22385
Hi,
Hope my analysis will help those who are designing with batteries and to help choose the apt power supply.
Please see the attached waveforms for a better insight.
Peak current at startup: approx 320mA @3.3V, so your power supply must be able to handle this. I use a large cap (470uF SMD) as the peak only comes up periodically.
Normal operation with AP connected: 35mA average. Note the peaks of 290+mA during packet operations. Interesting point is that when AP is not connected there is a constant drain of 70mA. (wifi.stat.disconnect()), so I guess for better battery usage you better be connected to an AP
In wifi.ap mode the drain is significantly more: approx 80mA
In deep sleep (node.dsleep(xxx,nnn)) it is about 0.1 mA. During wake up the power usage goes bat-crazy, so keep your deep sleeps far between to counter wakeup drains. For deep sleep you must connect RST to GPIO16 + Pullup with 10K or else the module will not wake up. For ESP-V7 you can leave the GPIO0 and GPIO2 floating.
To summarize in my experience a typical 2500mA AAx3 will give you approx 30hours of continuous service. Obviously you do not want that, so the typical 59 minute deep sleep and 1 minute wakeup pattern of 50 minute will get you around 15-20 days
PS: Please note that I removed the red LED before doing the analysis saving me 5mA constant drain
Hope my analysis will help those who are designing with batteries and to help choose the apt power supply.
Please see the attached waveforms for a better insight.
Peak current at startup: approx 320mA @3.3V, so your power supply must be able to handle this. I use a large cap (470uF SMD) as the peak only comes up periodically.
Normal operation with AP connected: 35mA average. Note the peaks of 290+mA during packet operations. Interesting point is that when AP is not connected there is a constant drain of 70mA. (wifi.stat.disconnect()), so I guess for better battery usage you better be connected to an AP
In wifi.ap mode the drain is significantly more: approx 80mA
In deep sleep (node.dsleep(xxx,nnn)) it is about 0.1 mA. During wake up the power usage goes bat-crazy, so keep your deep sleeps far between to counter wakeup drains. For deep sleep you must connect RST to GPIO16 + Pullup with 10K or else the module will not wake up. For ESP-V7 you can leave the GPIO0 and GPIO2 floating.
To summarize in my experience a typical 2500mA AAx3 will give you approx 30hours of continuous service. Obviously you do not want that, so the typical 59 minute deep sleep and 1 minute wakeup pattern of 50 minute will get you around 15-20 days
PS: Please note that I removed the red LED before doing the analysis saving me 5mA constant drain
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Last edited by dkdileep on Sat Jul 04, 2015 7:45 am, edited 1 time in total.
