-
Thr 2017.06.01
From #14
Thank you @allObjects for the datasheets and detailed analysis.From #21
@trusktr after consideration of your project requirements, the suggestion that Gordon made of using a USB power pack makes more sense for the demo, my suggestion for the power adaptor (I use a Kindle charger) should you have one lying around or for long term power on requirementsFrom #19
Just to confirm, this is to the 3.3v pin (which the schematic calls "3.3v output"), NOT the VUSB pin?
As @trusktr had the same question, would @Gordon please expound on the following to add clarification for us all:
It is given that: (links found in #2 above)
- The schematic at github shows that there is a VBUS [ J2-2 ] and a VUSB
- The regulator shows an input of 5v but isn't clear on it's origin (after Fuse F1 perhaps)
- EspruinoWiFi documentation explains that the 3.3v pin [ J2-3 ] is an output
- There is a stern warning not to connect VBUS [ J2-2 ] when the micro USB connector is attached
Q1: Was this distinction VBUS vs VUSB made for schematic software reasons and not a typo?
Q2: What/Where is the connector showing VUSB/DM/DP or is this the input to the WiFi module?
Q3: Under the assumption the micro USB connector is feeding the power, is it true that VBUS [ J2-2 ] is available as an output and that it is electrically connected to the input (after Fuse F1 perhaps) of the regulator as 5v (the source a USB port supplies), and therefore also supplying 3.3v as VDD [ J2-3 ] as an output?
Q4: Under the assumption that supplemental power from a 3.3v battery is supplied, and that no micro USB connector is attached, that is could be applied as an input VDD at [ J2-3 ] bypassing the onboard regulator?
Note: This would mean there is no fuse protection and that input voltage would not be detectable at PA9/P30Q5: Similarly as above, upto 5v could be supplied by a regulated supply to VBUS [ J2-2 ], thus using the onboard voltage regulator, producing the 3.3v to the rest of the circuitry, and at VDD [ J2-3 ] as an output?
Thank you Gordon
- The schematic at github shows that there is a VBUS [ J2-2 ] and a VUSB
You are reading a single comment by @Robin and its replies.
Click here to read the full conversation.
Robin
Yes, it'd be fine.
Only if you are going to wire it up as @allObjects had suggested - if you do as in my post then you don't need to worry about the voltages (as long as the battery isn't much over 5v!).
Unfortunately not - the pin spacing is different. You might be able to bend pins and force it but I'd suggest a separate connector if possible (you can always buy the socket quite cheaply and then solder that direct to the pins).
Yes - it doesn't matter how you do it though - you could use one long bit of wire and strip the insulation in the middle if you wanted.
Yes, that's the one!
Just to add though - the USB power pack idea is easy, cheap, and tidy, and it'll easily run the Espruino WiFi for far more than a day, which would probably be enough for you?