Power Specifications
Posted: Thu Jul 30, 2015 11:25 pm
Can anyone point me to the power Specification for the WiPy. I would need to put it into sleep mode 98% of the time.
Thanks
Thanks
Please see the new forum at
https://forum.micropython.org/
Because an access point needs to fulfill certain requirements like sending beacons, keeping the receiver ON all the time, etc. This needs to be done like this in order to be fully WiFi compliant.1. Why is the power requirement so high in suspended WiFi AP mode as compared to suspended WiFi Station mode?
Do you mean that it will be able to assign IP addresses automatically? In the case the answer is YES, and this is the default setting. Bare in mind that in AP mode only ONE other device can be connected to the WiPy.2. In Wifi AP mode is it possible to configure the WIPy as a DHCP Server?
It is possible, but I haven't implemented this feature yet. In principle, WiFi is always ON, because, due to the way the CC3200 has been designed, access to the serial flash must be done via the Network Processor, and when WiFi is OFF, accesing the /flash file system is not possible. This means than any file operation on /flash will fail. I could add a method to disable WiFi on demand3. When waking from Hibernation mode (5uA) is it possible to keep the Wifi module in a disabled mode (off) in order to minimize power?
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WLAN().disable()
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OSError
The current only drops 800uA, therefore I don't think that the benefit is worth the hassle. So instead of 14mA it consumes 13.2. The CC3200 Network Processor was designed from the ground up to be ultra low power, hence when in Station mode and not connected the Network processor itself only consumes ~300uA. Instead of disabling WiFi completely, just do:Active (WiFi Disable mode) MCU @ 80MHz
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WLAN(WLAN.STA)
WLAN().disconnect()
This is not possible, when the MCU is active the frequency is fixed to 80MHz. The CC3200 doesn't support frequency scaling.Active (WiFi Disable mode) MCU @ 40MHz
We launched an expansion board that is also available via our webshop. The microSD card socket is of the luxury push-push type, and besides that it also has some other cool features. Check it out here: http://wipy.io/product/expansion-board-pre-order/Also, since the WiPy does not have an SD card do you have one to recommend?
I finally found an interesting application for my Wipy (v1) however I am running into a much higher consumption. in WiFi AP mode the board is consuming 70mA base instead of 45mA, with peaks up to 300mA. The power supply is only capable of ~100mA so the current peaks are killing the application. Adding a bunch of capacitors did not help. I placed an ceramic 10uF and 2xelco on both 3v3 and 5V (Vin) but no improvement Even adding 560uF or 1000uF on the 5V did not change a thing.danicampora wrote: ↑Fri Jul 31, 2015 8:12 amWe will add detailed tech specs with this info to our website. In the mean time, here they are:
Active (WiFi Station mode) MCU @ 80MHz ---> 14mA
Active (WiFi AP mode) MCU @ 80MHz ---> 45mA
Suspended (WiFi Station mode) ---------------> 850uA
Suspended (WiFi AP mode) -------------------> 30mA
Hibernating (WiFi is always disabled) -------------> 5uA