owenn93

@owennguyen · Joined July 2026

Newcomer

Engineering student · university · new to IoT

Topics: 2
Replies: 6
Points: 0

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Forum Replies Created

Posted October 31, 2026 at 2:58 pm · in Uno on a 12 V adapter and USB at the same time: will it fry my laptop? #6

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 dropped once in two days and the reading stays around 405-415 when the valve switches. Also added the one second pause. Thanks!

Posted October 31, 2026 at 12:14 pm · in Uno on a 12 V adapter and USB at the same time: will it fry my laptop? #4

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 ground on the breadboard. No diode anywhere, I didn’t know I needed one.

Posted October 16, 2026 at 7:28 pm · in Eight meters on 30 m of RS-485 at 9600 baud: do I need termination, or is it something else? #5

Added 680 ohm bias at the Pi end and swapped to a proper twisted pair with a ground wire. 24 hours without a single timeout. I hadn’t even heard of biasing, thanks Laura. And no, I didn’t put 120 ohm on every meter.

Posted September 29, 2026 at 5:14 pm · in Switching Wi-Fi bulbs from a board Switch through my Pi, no vendor app #6

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

Posted September 14, 2026 at 11:46 pm · in Python call to the latest-values endpoint hangs for two minutes on our Pi #2

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

Posted August 9, 2026 at 12:41 am · in HC-05 vs HC-06 vs HM-10 for an Uno that has to reach a Pi gateway six metres away #2

Following, I have exactly the same confusion.