Replied to Uno on a 12 V adapter and USB at the same time: will it fry my laptop?

It was the diode. Put a 1N4007 on the valve and moved the relay to its own 5 V supply. The COM port hasn't…

1 week, 6 days ago

Replied to Uno on a 12 V adapter and USB at the same time: will it fry my laptop?

Relay module VCC is on the Uno's 5V pin. Valve is 12 V through the relay contact, from the same adapter. Everything shares one…

1 week, 6 days ago

Started Uno on a 12 V adapter and USB at the same time: will it fry my laptop?

hi, first year student, so sorry if this is obvious. I have an Uno reading a capacitive soil moisture sensor on A0 and switching…

2 weeks ago

Replied to Eight meters on 30 m of RS-485 at 9600 baud: do I need termination, or is it something else?

Added 680 ohm bias at the Pi end and swapped to a proper twisted pair with a ground wire. 24 hours without a single…

4 weeks ago

Started Eight meters on 30 m of RS-485 at 9600 baud: do I need termination, or is it something else?

Student here, first time with RS-485, so sorry for basic questions.Our lab has eight small Modbus RTU energy meters on one RS-485 line, about…

1 month ago

Replied to Switching Wi-Fi bulbs from a board Switch through my Pi, no vendor app

Why does it have to be a catalog command, couldn't the board send anything?

1 month, 2 weeks ago

Replied to Python call to the latest-values endpoint hangs for two minutes on our Pi

Could it be the API key's IP allowlist blocking you sometimes?

2 months ago

Replied to HC-05 vs HC-06 vs HM-10 for an Uno that has to reach a Pi gateway six metres away

Following, I have exactly the same confusion.

3 months, 1 week ago