UART in Depth: Serial Links Between Devices

10 Lektionen in dieser Stufe

1. Anatomy of a UART Frame: Start, Data, Parity, Stop
   Describe how one byte is sent bit by bit without a clock line. · Lab: Draw the waveform for the letter A at 9600 baud by hand.
2. Baud Rate Error and Why High Speeds Sometimes Fail
   Relate clock accuracy and baud divisor to reception errors. · Lab: Calculate the real baud rate and error at 115200 on a 16 MHz board and test a link at several speeds.
3. Capturing Serial Traffic with a Logic Analyzer
   Connect a logic analyzer, record a signal and decode it as serial data. · Lab: Capture the board printing text and read the decoded characters.
4. USB-to-Serial Adapters and Crossing TX with RX
   Wire an external adapter correctly and talk to a board without its USB port. · Lab: Open a second serial channel to the computer through an adapter.
5. 5 V and 3.3 V Logic: Level Shifting Done Right
   Protect 3.3 V parts with dividers or shifter modules and know when none is needed. · Lab: Build a resistor divider for one direction and use a shifter module for both, verifying levels by meter.
6. SoftwareSerial and Its Limits
   Create an extra serial port in software and understand its speed and timing restrictions. · Lab: Talk to a module at 9600 baud on two free pins while keeping USB serial for debugging.
7. Multiple Hardware Serial Ports on a Mega-Compatible Board
   Use Serial1 to Serial3 for reliable parallel links. · Lab: Bridge data between the computer and a module through a Mega-compatible board.
8. Designing a Framed Message Protocol with Checksum
   Define start marker, length, payload and checksum and parse it with a state machine. · Lab: Send sensor frames between two boards and reject deliberately corrupted ones.
9. Parsing NMEA Sentences from a GPS Module
   Extract time, position and speed from text sentences and validate them. · Lab: Display latitude, longitude, speed and satellite count outdoors.
10. Wireless Serial with an HC-05 Bluetooth Module
    Pair a classic Bluetooth serial module with a phone and configure it by AT commands. · Lab: Send commands from a phone terminal app to switch outputs and receive readings.

Abschlussprojekt

A GPS speed and position display that also relays formatted data to a phone over Bluetooth with a checksummed message format.

Teile für diese Stufe

• 1 × UNO-compatible board
• 1 × Mega-compatible board
• 2 × USB cable matching each board
• 1 × Solderless breadboard 830 points
• 1 × Jumper wire set male-male and male-female
• 1 × USB logic analyzer 8 channel
• 1 × USB-to-serial adapter 3.3 V and 5 V
• 1 × Bidirectional logic level shifter module
• 1 × GPS receiver module with antenna
• 1 × HC-05 Bluetooth serial module
• 2 × Resistor 1 kilohm
• 2 × Resistor 2 kilohm
• 1 × OLED display 0.96 inch I2C 128x64

In jeder Lektion legst du die passenden Teile direkt in den Warenkorb. Arduino-kompatibel →