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https://github.com/devel0/iot-examples

iot examples and wirings
https://github.com/devel0/iot-examples

arduino arduino-nano examples mbed pinout platformio rotary-encoder stm32 stm32duino vscode

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iot examples and wirings

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README 

        
# iot-examples



- [description](#description)

- [quickstart](#quickstart)

- [arduino](#arduino)

  - [examples](#examples)

  - [development](#development)

- [platformio](#platformio)

  - [examples (mbed)](#examples-mbed)

  - [examples (arduino)](#examples-arduino)

  - [development](#development-1)

  - [troubleshoot debug](#troubleshoot-debug)

- [stm32duino](#stm32duino)

  - [examples](#examples-1)

  - [development](#development-2)

- [hardware](#hardware)

  - [arduino nano V3](#arduino-nano-v3)

  - [nucleo-64 F446RE](#nucleo-64-f446re)

    - [troubleshoot](#troubleshoot)

  - [nucleo-144 F767ZI](#nucleo-144-f767zi)

  - [raspberry pi 4](#raspberry-pi-4)



## description



Examples for various



- boards ( arduino nano, stm32 )

- frameworks ( arduino, stm32duino, mbed )

- development environments ( vscode arduino, platformio )



## quickstart



```sh

git clone https://github.com/devel0/iot-examples

cd iot-examples

code arduino/ledblink

```



## arduino



### examples



- arduino nano v3

  - [ds18b20](arduino/arduino-nano-v3/ds18b20)

  - [ledblink](arduino/arduino-nano-v3/ledblink)

  - [nano-as-serial-reader](arduino/arduino-nano-v3/nano-as-serial-reader)

  - [rotary-encoder](arduino/arduino-nano-v3/rotary-encoder)

  - [signal-gen](arduino/arduino-nano-v3/signal-gen)



### development



- prerequisites

  - [vscode](https://code.visualstudio.com/)

  - [arduino ide](https://www.arduino.cc/en/software)

  - [vscode arduino](https://marketplace.visualstudio.com/items?itemName=vsciot-vscode.vscode-arduino)    

- troubleshoot

  - `avrdude: stk500_getsync() attempt 1 of 10: not in sync` uploading on arduino nano ; set `"configuration": "cpu=atmega328old",` on `.vscode/arduino.json`

  - usb permission error on linux: add your user to `dialout` group and set `/etc/udev/rules.d/99-arduino-usb.rules` to automodify arduino serial permission with follow ( check your idVendor:idProduct through `lsusb` ) `SUBSYSTEMS=="usb", ATTRS{idVendor}=="1a86", ATTRS{idProduct}=="7523", MODE="0666"`

- debug

  - using `Serial.print` through USB cable

  - C-S-p `Arduino: Upload` then C-S-p `Arduino: Open Serial Monitor`

- increase build speed setting `.vscode/arduino.json` with `{ "output": "./build" }`



## platformio



### examples (mbed)



- bluepill F103C8

  - [hello-world](platformio/bluepill-F103C8/mbed/hello-world)

- nucleo-64-F446RE

  - [hello-world](platformio/nucleo-64-F446RE/mbed/hello-world)

- nucleo-144-F767ZI

  - [hello-world](platformio/nucleo-144-F767ZI/mbed/hello-world)



### examples (arduino)



- bluepill F103C8

  - [temp-sensors2](platformio/bluepill-F103C8/arduino/temp-sensors2)

- ds18b20

  - [ds18b20](platformio/arduino-nano-v3/ds18b20-nano)



### development



- prerequisites

  - [vscode](https://code.visualstudio.com/)

  - [platformio](https://marketplace.visualstudio.com/items?itemName=platformio.platformio-ide)

- troubleshoot

  - receive `conflicted extension arduino` go to vscode extensions and from arduino ext select from dropdown `Disable (Workspace)`

  - receive `Error: init mode failed (unable to connect to the target)` on upload ; solve by hit RESET btn until yellow `srst_only separate srst_nogate srst_open_drain connect_deassert_srst` not appears on terminal

  - receive `[upload] Error` even `Verified OK` ; watch at monitor C-A-s and press RESET to retry start program

  - receive `Warn : UNEXPECTED idcode: 0x2ba01477 ; Error: expected 1 of 1: 0x1ba01477` ; can set `upload_flags = -c set CPUTAPID 0x2ba01477` on platformio.ini

- debug

  - using `printf` output go to monitor ( C-S-p `PlatformIO: Serial Monitor` ) ; it goes over usb cable used for programming to stlink connector

  - through C-S-p `PlatformIO: Start Debugging` ( working for platformio 5.0.4 )



### troubleshoot debug



- do a platformio/cleanup before



- with platformio/upload receive



```

xPack OpenOCD, x86_64 Open On-Chip Debugger 0.10.0+dev-00378-ge5be992df (2020-06-26-09:27)

Licensed under GNU GPL v2

For bug reports, read

        http://openocd.org/doc/doxygen/bugs.html

debug_level: 1



srst_only separate srst_nogate srst_open_drain connect_deassert_srst



Error: init mode failed (unable to connect to the target)

in procedure 'program'

** OpenOCD init failed **

shutdown command invoked



*** [upload] Error 1

```



- solve that by hitting RESET btn until `srst_only separate srst_nogate srst_open_drain connect_deassert_srst` then release and upload goes fine



- hit F5 to debug ( set a breakpoint on an instruction to check )



- if use `DigitalOut` on alternate function pins SWDIO/SWCLK may have problem during reset just after upload ( for example, avoid to use PA13, PA14 on STM32F446RE as DigitalOut )



## stm32duino



### examples



- bluepill F103C8

  - [hello-world](stm32duino/bluepill-F103C8/hello-world)

- nucleo-64-F446RE

  - [hello-world](stm32duino/nucleo-64-F446RE/hello-world)

  - [dac](stm32duino/nucleo-64-F446RE/dac)

- nucleo-144-F767ZI

  - [hello-world](stm32duino/nucleo-144-F767ZI/hello-world)



### development



- prerequisites

  - [vscode](https://code.visualstudio.com/)

  - [arduino ide](https://www.arduino.cc/en/software)

  - [vscode arduino](https://marketplace.visualstudio.com/items?itemName=vsciot-vscode.vscode-arduino)  

  - https://github.com/stm32duino/Arduino_Core_STM32

  - https://www.st.com/en/development-tools/stm32cubeprog.html

  - arm gcc `xpm install --global @xpack-dev-tools/arm-none-eabi-gcc@latest`

  - openocd `xpm install --global @xpack-dev-tools/openocd@latest`

- connect STLINK V2 ( 4 wires 3.3-swdio-swclk-gnd )

- debug

  - using `Serial.print`

    - bluepill: through USB-TTL connected to serial (eg. stm32f103c8 pins A9,A10)

    - nucleo64/144: through usb cable ( `/dev/ttyACM0` )

    - then C-S-p `Arduino: Upload` then C-S-p `Arduino: Open Serial Monitor`

  - with active debugger setting `.vscode/launch.json` ( see [hello-world](stm32duino/hello-world/.vscode/launch.json) example ) then press F5

- troubleshoot

  - if receive `Send Event AD7MessageEvent` on debug console try to run corresponding `openocd` with arguments given from debug console to test board connection; may you got `Warn : UNEXPECTED idcode: 0x2ba01477` and `Error: expected 1 of 1: 0x1ba01477` that you can fix in `.vscode/launch.json` by setting `"debugServerArgs": "-f interface/stlink-v2.cfg -c \"set CPUTAPID 0x2ba01477\" -f target/stm32f1x.cfg",`

  - if debugger start but breakpoint still grayed double check `.vscode/arduino.json` and see if `"configuration"` contains `opt=ogstd` that is Optimize for Debug (-g) while default is Optimize for Smallest (-Os default) on `opt=osstd`.

  - board:arduino nano

    - if upload fails check on `.vscode/arduino.json` if `"configuration": "cpu=atmega328old"`



## hardware



### arduino nano V3



![pinout](https://raw.githubusercontent.com/devel0/iot-examples/main/wirings/arduino-nano-v3-rot.svg)



- CPU 16Mhz / SRAM 2KB / EEPROM 1KB / FLASH 32KB

- power supply types

  - USB cable

  - `VIN` pin (unregulated 7-12V) to AMS1117-5.0

  - `5V` pin (regulated 5V)

- max current

  - I/O pins (40mA)

  - `3.3V` pin (50mA) from CH340

- 2 x hardware interrupt

- 8 x 10bit ADC

- 6 x PWM



### nucleo-64 F446RE



![pinout](https://raw.githubusercontent.com/devel0/iot-examples/main/wirings/nucleo64-F446RE.svg)



- CPU 180Mhz / SRAM 128KB / EEPROM 0KB / FLASH 512KB

- power supply types

  - USB cable (300mA max)

  - `VIN` CN6/pin8 or CN7/pin24 (unregulated 7-12V ; max 800mA)

  - `E5V` CN7/pin6 (regulated 5V ; max 500mA)        

  - `3V3` CN6/pin4 or CN7/pin12 (regulated 3V3) `[stlink debug unavail]`

- max current

  - I/O pins (25mA ; total 120mA)

  - `3.3V` pin (240mA)

- hardware interrupt on all digital pin

- 3 x 12bit ADC

- 2 x 12bit DAC



#### troubleshoot



- `libusb_open() failed with LIBUSB_ERROR_ACCESS`



```sh

apt install stlink-tools

systemctl restart udev

```



- create `/etc/udev/rules.d/90-stlink.rules` with content



```sh

SUBSYSTEMS=="usb", ATTRS{idVendor}=="0483", ATTRS{idProduct}=="374b", MODE="0666

```



then reload udev



```sh

udevadm control --reload-rules && udevadm trigger

```



### nucleo-144 F767ZI



- [pinout](https://raw.githubusercontent.com/devel0/iot-examples/main/wirings/nucleo144-F767ZI.svg)

- CPU 216Mhz / SRAM 512KB / EEPROM 0KB / FLASH 2048KB

- power supply types

  - USB cable (300mA max)

  - `VIN` CN8/pin15 or CN11/pin24 (unregulated 7-12V ; max 800mA if VIN=7V ; max 450mA if 9>VIN>7 ; max 250mA if 12>VIN>9)

  - `E5V` CN11/pin6 (regulated 5V in 4.75-5.25V ; max 500mA)

  - `3V3` CN8/pin7 or CN11/pin6 (regulated 3V3 in 3-3.6V) `[stlink debug unavail]`

- max current

  - I/O pins (25mA ; total 120mA)

  - `3.3V` pin (420mA)

- hardware interrupt on all digital pin

- 3 x 12bit ADC

- 2 x 12bit DAC



### raspberry pi 4



- [pinout](https://raw.githubusercontent.com/devel0/iot-examples/main/wirings/raspberry-pi-4.svg)