@KiraKiraSoul said in Expansion Board 3.0 Vin (3.5-5.5V) pin: In other words, is the input voltage regulated in any way on the expansion board? No. It's the same signal, just differently labeled. When connected to USB, you should see 5V at that pin coming from USB. Otherwise you can supply a xxPy device at that pin with input voltages from 3.5-5.5 V.

@brossingo It's unclear if you mean voltage supplied BY the device, or voltage supplied TO the device. If you're using USB, the voltage is obviously supplied by an external device (PC, power supply...) TO the device, and the device can't change that. If you want to use a different voltage, your probably want to use the battery connector instead, though it depends a lot on what actual voltage you can feed the device and a lot of other considerations. Could you give more details about what exactly you are trying to achieve?

Hello @crasu if you use the pycom firmware tool and select "development" in the type dropdown on the communication page instead of "stable" you'll flash the latest release candidate that should have a fix for this.

@jmarcelino It's without ADC (maybe I need to do it with an ADC). It's just a pin defined as input like : pin = Pin('P19', mode = Pin.IN, pull = Pin.PULL_DOWN) pin.value() which gives me a simple 0 or 1 (I guess 1 when the voltage is at least half of the 3v3?). I will check what the ADC version gives me next week (I have no module with me unfortunately this week-end). It might give me the reading I want. Also thanks Robert for your answer, I will have a look into the pin sheets of the module.

Could you use a battery and inductively charge the battery?

@robert-hh Sorry, I misunderstood. I didn't take the pin's voltage with the 1V connected, however I took the voltages of other pins without anything connected. I think the input-only pins were fine, as was pin 20 (and a few others) but some GPIO pins were outputting between 1-3 volts.

@robert-hh - Thanks - I'll get a couple and take a look. Since I only do this stuff for my own use, my volume scale is usually 1!

Just tried to power my sensor as you said and it is indeed working, are there any risks of doing so ?

@Officina I just tried running the device with 3.3 V on Vin, and it works. At the moment, the DC in is at 2.95 V, and still running. According to the data sheet of the regulator, it goes into a bypass mode if the input voltage is too low, and that's what I wanted to confirm. So it looks as if is more safe to run with a low Voltage on Vin.

@Eric24 we will update the data sheets with more detailed info about operating ranges soon, but in the meantime, from 2.7 to 3.6 V is the recommended range. Same during deep sleep.

Hi...i am a new user here. As per my knowledge 5.6v is out of spec and should be considered unsafe. Most likely it will work, since USB ports tend to be poorly regulated and these devices take that into account with lots of safety margin, but you risk your player doing so. You might want to look into putting together a 5v regulator circuit to be safe. complete pcb