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Merge pull request #555 from Sn1PeR/Example-Serial-to-Additional-Microcontroller

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Update serial.mdx
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Ben Meadors 2023-01-05 12:53:55 -06:00 committed by GitHub
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docs/configuration/module-config/serial.mdx
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@ -178,3 +178,51 @@ Default is to use RX GPIO 16 and TX GPIO 17.
With [tio](https://github.com/tio/tio) – `tio -e -b 38400 -f none /dev/myserialport`
7. Send a packet up to 237 bytes in length. This will get relayed over the mesh network.
8. (Optional) Set `serial.echo` to `1` and any message you send out will be echoed back to your device.
### T-Beam – Interfacing PIR Sensor With External Microcontroller:
The following is an example of using a Raspberry Pi Pico connected to a PIR sensor to detect motion. When motion is detected, a message is sent via. serial to the T-Beam. The T-Beam transmits the message as text over the default channel by utilizing the serial module in TXTMSG mode.
#### BOM
- Raspberry Pi Pico running [CircuitPython](https://learn.adafruit.com/getting-started-with-raspberry-pi-pico-circuitpython)
- T-Beam V1.1 running Meshtastic
- PIR Sensor ([Adafruit Breadboard Model](https://www.adafruit.com/product/4871))
#### Meshtastic Software Configuration:
- Serial module enabled, mode: TXTMSG
- GPIO Pins (For T-Beam) RX 13, TX 14
- 38400 Baud
#### Wiring:
![image](https://user-images.githubusercontent.com/2799310/210852481-21ea76e5-ecaa-40c1-8f34-635ef2a1c95b.png)
- TX pin 14 on the T-Beam to RX pin 2 on the Pico
- RX pin 13 on the T-Beam to TX pin 1 on the Pico
- PIR sensor Vcc and GND pins to Vcc/GND on breadboard respectively
- PIR sensor trigger line to Pico GPIO28 (Pico pin 34)
- GND pin on T-Beam to GND pin 38 on the Pico
- GND pin 38 on the Pico to breadboard ground rail
- 3V3 pin 36 on the Pico to the breadboard positive voltage rail
- Optional, to power the Pico off of the T-Beam instead of USB:
- Connect 5V pin on T-Beam to Vbus pin 40 on the Pico
#### Circuit Python Code
```python
import time
import board
import busio
import digitalio
# Setup PIR sensor on GP28
pir = digitalio.DigitalInOut(board.GP28)
pir.direction = digitalio.Direction.INPUT
# Setup serial UART connection TX/RX on (GP0/GP1)
uart = busio.UART(board.GP0, board.GP1, baudrate=38400, timeout=0)
while True:
if(pir.value == True):
uart.write(bytes("Motion Detected", "ascii"))
time.sleep(30)
time.sleep(0.5)
```