11. Communication¶
Hero Shot of the Week¶
Summary¶
Work Process¶
Calendar¶
| Date | To be done | What was done |
|---|---|---|
| Thursday | ||
| Friday | - FabLab normal work | |
| Saturday | ||
| Sunday | ||
| Monday | ||
| Tuesday | - FabLab normal work | |
| Wednesday | - 12h Local - 13h Regional - 15h Global |
Introduction¶
Henk made an introduction based on Erwin 's slides.
Connection Types
- Star Topology
- everybody connects to only 1 center/main uC.
- Ring topology
- Connection in series
- Bus Topology
- 1 big data line that connect everyone
Protocols:
- UART
- Asynchronous (no clock)
- TX = Transmit
- RX = Receive
- fixed speed
- twisted wires for lower EMC
- SPI
- =Serial Peripheral Interface
- MISO-MOSI communication (Main-Secondary)
- synchronous (clock)
- High data rate
-
I2C
- Inter IC Communication
- mostly fixed addresses
- lots of (pre)communication to create connection between two devices
- fixe bus levels with pull-up/down
-
TCP/IP
- Transmission Control Protocol / Internet Protocol
- OSI layers
- 7 different layers
- local / non-local addresses
- Gateways
- Different protocols can be used with it
* Network Protocol Analyzer
Eye pattern Differential signalling
My work¶
Reading Time !¶
Searching for the b2b connector (I would like to use an extension cable)
- XAIO ESP32S3 & Wio_SX1262 connect by their onboard B2B connector - GitHub
- Seeed Forum
- It has no response 😢
- Seed Forum 2
- THIS ONE HAS AN ANSWER !!!
- It is the DF40C-30DP-0.4V(51) connector, but not the cable...
Schematics:
Wio-SX1262¶
LORA - Wireless¶
- LoRa Alliance
- XIAO LoRa (Fabtec V1)
- Using the “Wio-SX1262 for XIAO” to easily build LoRa point-to-point communication with various XIAOs
- Xiao esp32s3 wio-sx1262 Lora Kit as P2P LoRa node
ESP NOW - Wireless¶
I2C - Wired¶
ESP BlueTooth - Wireless¶
Backdoor story:
- The ESP32 Bluetooth Backdoor That Wasn’t
- ESP32 hidden HCI vendor commands, technical details and use cases
- Hacking Bluetooth the Easy way with ESP32 HCI Commands and hidden features
SPI - Wired¶
WiFi¶
So I tried out the example code given in the arduino IDE.
As you can see it detects ALL the wifi spots from the building. Not just the WiFi but all emitters. There is less WiFi visible in no scan mode as they are in a mesh mode. So you connect once and you will (re)connect the nearest WiFi spot, when you move around.
Other stuff¶
- GNU Radio - software radio
- OpenWrt
- Router OS
Learning Outcome¶
Digital Files and Links¶
Assignment Check¶
- individual assignment:
- design, build, and connect wired or wireless node(s) with network or bus addresses and local input &/or output device(s)
- group assignment:
- send a message between two projects