The Internet of Things Practical Guide starts with a discussion of popular Internet of Things protocols such as HTTP, UPnP, CoAP, MQTT, and XMPP, and introduces existing protocols, communication modes
As shown in the following 2 pictures, personal opinions1. In this case, the common-mode inductor should be effective, the board reflux is offset, RS485 communication is not grounded, and there is comm
[i=s]This post was last edited by Feihong Haojie on 2019-11-14 17:58[/i]I found the above picture when I was looking for the absolute value circuit, and then I fell into deep thought.
The op amp input
Fully integrated optical modules enable higher specification performancePhotoplethysmography (PPG) is a common technique for measuring blood oxygen saturation (SPO2) levels. A light transmitter is use