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‎content/micropython/06.communication/uart/uart.md‎

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@@ -26,7 +26,7 @@ Each device directly connects TX to RX and RX to TX.
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To observe the output of your UART communication, you’ll need a secondary board (or a USB-to-UART adapter) to act as a receiver. Here’s how you can set it up:
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1. **Primary Board (Transmitter):** Runs the main UART code examples provided below.
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2. **Secondary Board (Receiver):** Reads from the UART interface and displays the output on a serial monitor like Arduino IDE, PuTTY, or CoolTerm.
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2. **Secondary Board (Receiver):** Reads from the UART interface and displays the output on a serial monitor like Arduino IDEor PuTTY.
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### Circuit Setup
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- Connect the **TX1 (GPIO43)** of the primary board to the **RX** of the secondary board.
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![How to wire](assets/UARTTestingSetup.png)
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### Code for Secondary Board
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The secondary board simply forwards received UART data to its serial monitor. Use the following code:
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The board simply forwards received UART data to its serial monitor. Use the following code:
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```python
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from machine import UART
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print(ch, end="") # Print to the console
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```
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### Using the Secondary Board
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1. Flash the above code to the secondary board.
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2. Open a serial monitor for the secondary board (e.g., Arduino Lab for Micropython, Arduino IDE Serial Monitor, Putty).
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### Code Example
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Copy the following code into your `main.py` file and run it:
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Copy the following code into your `main.py` file and run it on the board you designated as "primary":
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```python
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from machine import UART, Timer
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### Code Example
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Copy the following code into your `main.py` file and run it on the board you designated as "primary":
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```python
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from machine import UART
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uart.write("pong\n")
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buffer = "" # Clear the buffer
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```
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Now copy the following code into your `main.py` file and run it on the board you designated as "secondary". In this case we are exanding the secondary board to be able to write via UART too:
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```python
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from machine import UART
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import sys
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import
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# Initialize UART
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uart = UART(1, baudrate=9600, tx=43, rx=44) # Adjust TX/RX pins as needed
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while True:
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# Check if there's data coming from UART
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if uart.any():
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ch = uart.read(1).decode() # Read one character from UART
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print(ch, end="") # Print to USB serial monitor
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# Check if there's data enselecttered in REPL
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if sys.stdin in select.select([sys.stdin], [], [], 0)[0]:
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input_text = sys.stdin.read().strip() # Read user input
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uart.write(input_text + "\n") # Send via UART
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```
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### Expected Output
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1. Type `ping` followed by `Enter` in your serial monitor.

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