Add instructions for LD2410

CMakeLists.txt

@@ -29,7 +29,7 @@ add_compile_options(-Wall
 
 if ((PICO_CYW43_SUPPORTED) AND (TARGET pico_cyw43_arch))
     add_executable(${NAME}
-            main.cpp ledcontrol.cpp ledcontrol.h util.h config.h encoder.cpp encoder.h iot.cpp iot.h presence.cpp presence.h config_iot.h mbedtls_util.c cJSON/cJSON.c cJSON/cJSON.h DFRobot_mmWave_Radar.cpp DFRobot_mmWave_Radar.h
+            main.cpp ledcontrol.cpp ledcontrol.h util.h config.h encoder.cpp encoder.h iot.cpp iot.h presence.cpp presence.h config_iot.h cJSON/cJSON.c cJSON/cJSON.h DFRobot_mmWave_Radar.cpp DFRobot_mmWave_Radar.h
         )
 else()
     add_executable(${NAME}

README.md

@@ -62,6 +62,13 @@ Only a single (right) side of the Pico is used for connections to allow for crea
 
 Pinout diagram is [here](./doc/pinout.png) or [from the back](./doc/pinout-back.png) (courtesy of [pinout.xyz](https://pico.pinout.xyz/))
 
+#### Using LD2410 sensor instead of DFRobot mmWave Radar
+
+Set `PRESENCE_UART_RX_PIN` and `PRESENCE_UART_TX_PIN` to `0` in `config.h` and connect the [LD2410](https://www.aliexpress.com/item/1005004351593073.html) sensor as such:
+  - `VCC` to `VSYS` (Pin 39)
+  - `GND` to any `GND` pin
+  - `OUT` to Pin 22 (see `PRESENCE_PIN`)
+
 ## Usage
 
 ### TL;DR
@@ -108,7 +115,6 @@ And the Pico SDK:
 ```bash
 git clone https://github.com/raspberrypi/pico-sdk
 cd pico-sdk
-git checkout develop # Switch to develop branch
 git submodule update --init
 export PICO_SDK_PATH=`pwd`
 cd ../