Delay in the physical world always came with time relay transmission and reflection. The sound to the edge of the space, the sound reflected listener’s ear, later than the direct sound. That cause delay. And this is the basic mechanism of all the time-related effects, such as echo, flange, Hass. …

Solve the GPIO problem on Raspberry Pi 4B I ran a UDA1334 on Raspberry Pi Zero before, and it worked great. But this week, when I connect the same chip on Raspberry Pi 4B, follow the same installing process, there was no sound came out. Wiring of the I2S Decoder UDA1334A to the Raspberry Pi Amp Vin to Raspberry Pi…

Install Mosquitto On Raspberry Pi Before installing the MQTT broker, update the operating system first. sudo apt update sudo apt full-upgrade 2. The mosquitto MQTT broker is available as part of the Raspbain repository, installing it becomes simple. sudo apt install mosquitto mosquitto-clients 3. Verify the MQTT broker is running on my Raspberry Pi sudo…

（机器女声） (Robotic female voice) 乘车必须佩戴口罩，平台建议乘客后排落座 Passengers must wear masks on the car, and the platform(DIDI) recommends that passengers sit in the back seat. 接到尾号7024的乘客，现在去上海纽约大学北二门，送该乘客 Picked up the passenger with the phone tail number 7024, now go to the North Second Gate of New York University Shanghai, Carrying the passenger. 200米绕环岛右转 …

I designed a box that can contain all the components inside it. I update the BOM a little bit. FRS Strip: Test Swipe on the surface. FRS Circle x 3: Test the touch on the surface. LED x 2: One for power indication and the other for the status. Seeduino…

Antenna and Wifi scanning — The really good news this week is the antenna of the Arduino 33 is back on board again! It’s been a long time since this antenna has left the board. This causes the Arduino to only got under -80 dBm wifi signal even the board is placed right next to…

ERM LRA

I design a flow chart using the temperature to control the heater on/off. The temperature coming from a DHT-22 sensor connecting to the internet through the MQTT protocol. The Node-Red connect to the MQTT broker first, and then the temperature data will be formatted by a function node before logged into the mqtt.log file.

After seeing the ubiquity of wireless devices sending and receiving data through invisible electromagnetic radiation, I start thinking about how this tech affects our space. In view of the fact that all currently connected devices hide the act of wireless-information transfer under the casing of the device, behind the ICE…