Rust program for Esp32 to detect movement via IR sensor

Esp32 program which uses a HW-416 passive infra red sensor (5V) to detect movement and sends the sensor state to Loxone server using udp. Also the Esp hosts a http server, so the user can change settings on the esp through a browser. Ota firmware flashing from target and ap network is implemented.

IR sensor: GPIO32 Test LED: GPIO33

Set up QEMU to simulate Esp32 hardware

build prerequisites see https://wiki.qemu.org/Hosts/Linux

sudo apt-get install git libglib2.0-dev libfdt-dev libpixman-1-dev zlib1g-dev ninja-build libgcrypt20 libgcrypt20-dev libudev-dev

get Qemu

git clone https://github.com/espressif/qemu

configure see https://github.com/espressif/qemu/wiki

./configure --target-list=xtensa-softmmu \
    --enable-gcrypt \
    --enable-debug --enable-sanitizers \
    --disable-strip --disable-user \
    --disable-capstone --disable-vnc \
    --disable-sdl --disable-gtk

build

ninja -C build

Set up toolchain and project

get toolchain see prerequisites at https://github.com/esp-rs/esp-idf-template#prerequisites and
https://docs.espressif.com/projects/esp-idf/en/v4.4.1/esp32/get-started/linux-setup.html

cargo install cargo-generate
cargo install ldproxy
cargo install espup
cargo install espflash
cargo install cargo-espflash
espup install

clone git repo

git clone https://github.com/ronny002/esp_move_detect

load env vars (once per terminal session)

• Bash:

source ~/export-esp.sh

• or if you use nushell

source export-esp.nu

Run with Qemu

build app.bin see https://esp-rs.github.io/book/tooling/simulating/qemu.html
use --features qemu to switch from wifi to eth (included in qemu.sh)
Build and run

./qemu.sh

Build

cargo espflash save-image --features qemu --merge --release ESP32 app.bin 

run bin in QEMU

~/Documents/code/rust/esp_move_detect/qemu/build/qemu-system-xtensa -nographic -machine esp32 -nic user,model=open_eth,id=lo0,hostfwd=udp:127.0.0.1:7888-:80 -drive file=app.bin,if=mtd,format=raw

Networking
see https://www.sbarjatiya.com/notes_wiki/index.php/Qemu_networking

• host (server) can be reached from guest (esp) with host ip
• to reach guest from host hostfw is needed hostfwd=tcp/upd:hostip:hostport-guestip:guestport
  • http server: 127.0.0.1:8080 forwarded to 10.0.2.15:80
• guest ip = 10.0.2.15
• host ip = 192.168.1.?

Run on Esp

sudo chmod 666 /dev/ttyUSB0

build, flash and monitor

cargo espflash --release --monitor /dev/ttyUSB0

only monitor

espflash serial-monitor /dev/ttyUSB0 

ota

Do not forget

source ~/export-esp.sh or source export-esp.nu

build ota app

cargo espflash save-image ESP32 app_ota.bin --release

click on ota http command in browser
use ota-downloader (cargo run) to download ota app to esp32 (set right path for app)
hint to cargo espflash: qemu bin needs --merge, ota bin no --merge

http server: html file

https://onecompiler.com/html/3z2tt824q

NAPT Router

When esp is far away from wifi router, it's possible to use different esp closer to wifi as wifi extender. Udp packets comming from esp far out are forwarded over esp wifi extender to loxone server. Internet is also forwarded.

• to configure esp as wifi extender uncommend everything after NAPT demo (router) in rust-bin/sdkconfig.defaults
• wifi extender hosts esp32_presence_detector wifi (referred as ap), set password in wifi_info_fill_out.rs
• esp far out needs to change target wifi to esp32_presence_detector
• to access http server of esp far out connect to esp32_presence_detector wifi and use 192.168.71.2 in browser

After changing settings use to rebuild lib

cargo clean -p embedded-svc v0.23.2 not working

To Do

• html list of ap clients
• monitor serial over wifi
• schematics
• movement detection sensitivity (connect pwm instead poti?)
• test and improve UX
• licences
• increase features of html website
• not working with high amps???
• qemu: hangs after esp_restart() so not possible to simulate ota flash
• low/high toggles with movement present when small follow-up time
• W (12889) httpd_txrx: httpd_sock_err: error in send : 104 thread '' panicked at 'connection is not in request phase', /home/ronny/.cargo/registry/src/github.com-1ecc6299db9ec823/esp-idf-svc-0.43.5/src/http/server.rs:838:13

Solved Problems

Problem rust-analyser can't find clang:
put this in vscode -> user settings (settings.json)

    "rust-analyzer.server.extraEnv": {
        "LIBCLANG_PATH": "/home/ronny/.espressif/tools/xtensa-esp32-elf-clang/esp-15.0.0-20221201-x86_64-unknown-linux-gnu/esp-clang/lib"
    },

see https://githubhelp.com/esp-rs/esp-idf-template/issues/49

Resources

• Esp Book https://esp-rs.github.io/book/
• Nice example program https://github.com/ivmarkov/rust-esp32-std-demo
• IR sensor https://electropeak.com/learn/pir-motion-sensor-how-pir-work-how-use-with-arduino/
• Browser Simulate https://wokwi.com/rust
• CONFIG in sdkconfig.defaults https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/kconfig.html#component-config-lwip-dhcp-server