4 ms·

What kind of power supply concerns? I've used quite a few of them and never had a problem. For USB-powered development boards IMO the best option is the raspbe

by tomn 3y ago

What kind of power supply concerns? I've used quite a few of them and never had a problem. For USB-powered development boards IMO the best option is the raspberry pi power supplies -- they are cheap, high quality, and can supply plenty of current. It's sometimes necessary to bridge over the input diode if you want to draw any significant current from the 5v pin. If making your own boards the maximum 3.3v current is higher than you might expect (0.5A), but it's perfectly doable.

regularfry 3y ago
Piggy-backing them on mains USB chargers has got me a long way, but what I want right now is something I can strap an 18650 to, wake the thing out of deep sleep once every five minutes to squirt a reading over MQTT, and recharge once a month (or whatever. As long as it's better than once a week). I haven't seen a board with the lipo management onboard to make it easy, but I also can't imagine it's that rare a use case.
- paxswill 3y ago
  The Adafruit Feather boards usually have built-in LiPo support.
  - chasd00 3y ago
    I use feathers a lot in hobby level projects. I wish they could use a 2s battery instead of 1s only. Other parts of my projects sometimes need the extra voltage and it would simplify things if the feather could handle (and charge) a 2s.
- 45ure 3y ago
  The Xiao BLE nRF52840 might be worth a look. https://wiki.seeedstudio.com/XIAO_BLE/ https://wiki.seeedstudio.com/XIAO_BLE/
- int0x2e 3y ago
  My smart home is also my home security solution, so I wanted it to work through a (short) power failure. Getting a UPS for my Home Assistant node was the easy part. Like you, I was worried about the many nodes scattered throughout the house that needed power. The solution I've come to for now is using a USB plug for mains power, that goes through a DIY USB battery bank charging board (that I got off AliExpress) that's plugged into an 18650 cell. Most of these boards can either charge or provide a 5v out, but some are happy to do both at the same time, and can act as a mini-UPS.

by tomn 3y ago

regularfry 3y ago

Piggy-backing them on mains USB chargers has got me a long way, but what I want right now is something I can strap an 18650 to, wake the thing out of deep sleep once every five minutes to squirt a reading over MQTT, and recharge once a month (or whatever. As long as it's better than once a week). I haven't seen a board with the lipo management onboard to make it easy, but I also can't imagine it's that rare a use case.

paxswill 3y ago
The Adafruit Feather boards usually have built-in LiPo support.
- chasd00 3y ago
  I use feathers a lot in hobby level projects. I wish they could use a 2s battery instead of 1s only. Other parts of my projects sometimes need the extra voltage and it would simplify things if the feather could handle (and charge) a 2s.
45ure 3y ago
The Xiao BLE nRF52840 might be worth a look. https://wiki.seeedstudio.com/XIAO_BLE/ https://wiki.seeedstudio.com/XIAO_BLE/
int0x2e 3y ago
My smart home is also my home security solution, so I wanted it to work through a (short) power failure. Getting a UPS for my Home Assistant node was the easy part. Like you, I was worried about the many nodes scattered throughout the house that needed power. The solution I've come to for now is using a USB plug for mains power, that goes through a DIY USB battery bank charging board (that I got off AliExpress) that's plugged into an 18650 cell. Most of these boards can either charge or provide a 5v out, but some are happy to do both at the same time, and can act as a mini-UPS.