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Questions tagged [power-sources]

For questions about how a device is powered in general, where that is the primary purpose of the question.

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Mains circuit phase balancing relay?

I am looking for a device, like a special relay that would allow me to dynamically switch/move some of my home appliances between the 3 phases that I have on my mains circuit. Is this possible? The ...
Gabor Herman's user avatar
4 votes
0 answers

Alarm system built with raspberry + sonoff rf bridge

I am developing a personal project at the end of which I should be able to create a homemade alarm system. All this should be protected against voltage drops/failures, the whole circuit will be inside ...
Mattia's user avatar
  • 141
1 vote
1 answer

Can portable routers be connected to power supply for months without damaging their batterry?

I am looking for a solution to provide internet connectivity to my iot device through a router which would not be affected by power failures (of no more than 3 hours). The options that I can see are ...
Marinos An's user avatar
2 votes
1 answer

All possible Wired communication protocols that also transmit power supply in IoT [closed]

I am on the lookout for Wired networks deployed in Industrial and other IoT applicable sectors which use cables to transfer Power + Data. I am aware of: Power over Ethernet (PoE) IEEE standard ...
Shan-Desai's user avatar
  • 1,558
0 votes
0 answers

ESP32 - using 3.3V Dual relay

I have an issue- which I guess is has some power issue. I'm using ESP32 and a 3.3v Dual relay. My code is simple ( switch up and switch down ), and works fine. The thing is that when all wires are ...
guyd's user avatar
  • 871
5 votes
1 answer

Does powering NodeMCU with 3.3 V also power USB-UART module?

I want to power my nodemcu module with 3.3 V. Does powering it with 3.3 V also power USB-UART module? If so I do not want this as it eats the battery.
a-c-sreedhar-reddy's user avatar
2 votes
0 answers

ESP32 - 5V output to operate a Relay

I'm playing around with a new ESP32 flashed with Micropython from eBay in order to replace a Rpi Zero W. Am I missing the 5v output? I need it to operate a Relay. Can a 5vDC Relay be operated as ...
guyd's user avatar
  • 871
3 votes
1 answer

Solar panel + battery power for IoT device with 802.11n [closed]

I've only got basic skills but i am trying to hack together an ESP32 + temperature sensor to send periodic readings out via Wi-Fi. I've managed to get the board to connect to Wi-Fi, read the sensor, ...
davidgo's user avatar
  • 173
5 votes
0 answers

How mature is massive MIMO energy harvesting (in the 3GPP standards)?

About a year ago I attended a presentation where it was explained that a successful and thorough proof-of-concept for LTE massive MIMO had been conducted and was hopefully going to make it to into 5G1....
Chris Steinbach's user avatar
16 votes
2 answers

ESP8266 with ethernet connection

I was wondering if someone knows a way to convert a ESP8266 to non-WiFi. I.e. have it connected through Ethernet, preferably with PoE possibility. Reason for asking: My plan is to have sensors in a ...
Jimmy Westberg's user avatar