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https://github.com/danielmartensson/stm32-plc

STM32 microcontroller with lots of periferials such as ADC, differential ADC, Input Capture, PWM, USB, Encoder, DAC, Digital Input, RTC, CAN-bus + Alarm etc.
https://github.com/danielmartensson/stm32-plc

c can-bus embedded-systems stm32 usb

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STM32 microcontroller with lots of periferials such as ADC, differential ADC, Input Capture, PWM, USB, Encoder, DAC, Digital Input, RTC, CAN-bus + Alarm etc.

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README 

        
# STM32 PLC



![a](https://raw.githubusercontent.com/DanielMartensson/STM32-PLC/main/Documentation/Pinmap.png)



This project is a PCB bord that has the following measurement and control input/output:



 * 12 x ADC at 16-bit resolution for 0-20mA input with programmable gain

 * 5 x Differential ADC at 16-bit for 0-20mA input with programmable gain

 * 3 x DAC at 12-bit with 0-20mA output

 * 8 x PWM for 0-2.2A with N-channel MOSFET

 * 10 x Digital Input

 * 1 x CAN-bus channel

 * 4 x Input Capture for 0 kHz to 10kHz

 * 3 x Encoder for -32768 to 32767 pulses

 * 1 x USB port for connecting with [OpenSourceLogger](https://github.com/DanielMartensson/OpenSourceLogger) and [GoobySoft](https://github.com/DanielMartensson/GoobySoft)

 * 1 x SPI with 3 chip select for ILI9341 LCD with touch

 * 1 x ST-Link V2 connection

 * 1 x RTC clock with two alarms A(date) and B(week day) and a battery holder so the RTC remembers the date and time



## Protection 

 * All ADC, Digital Input, Differential ADC, Input Capture and Encoder are high voltage protected with PTC(fall current 30mA) fuse + 3.6v zener diode.

 * All PWM and DAC are high voltage protected with N-channel MOSFET and PNP-transistor and OP-amp. 

 * The CAN-bus channel is high voltage peak protected for 3000V under a short time with a TVS-diode. The CAN-bus transmitter itself can hold against -14V to +14V, but the TVS-diode has a limit around 6V. 



## Documentation

The documentation for the pin map can be found in the `Documentation` folder. Also all the article numbers for each component can be found in at the `DAC ADC PWM IO.sch` file in the `PCB` folder. Just double click on a PCB symbol and see the `Mouser Electronics` article number of the electrical component. 



## Calibration

Yes, it's possible to set the calibration to each input in this project. You need to have the ILI9341 touch LCD with SPI bus. Open the `STM32 PLC Pinouts.pdf` and see the connection for the LCD. You can also set the PWM frequency and analog input gain for the ADC and Differential ADC at 16-bit. 



## SAE J1939

The STM32 PLC has internal SAE J1939 protocol. Made from [Open-SAE-J1939](https://github.com/DanielMartensson/Open-SAE-J1939) repository.



## OpenSourceLogger

This is a QT C++ software that you can connect to your STM32 PLC board via the USB and then you can send signals from OpenSourceLogger and recieve signals.

OpenSourceLogger is a very easy to use logging and controlling software and it stores data at a SQL server. 



## GoobySoft

This is a ImGui C++ project that do the same as OpenSourceLogger, but it's much better and have more features. The reason why I moved away from QT C++ to ImGui C++ is because

it's much easier to write a GUI application in C++ by using ImGui instead of QT. With QT, you are stuck with object oriented programming. Everything is a class. 

But for ImGui, you can choose which type of lever you want to code, I prefer C-style C++ code with a small dose of object oriented programming (if needed). 



Consider that I will work on GoobySoft instead of OpenSourceLogger.



## Program 

The STM32 PLC has a lot of functions you can select by touching the LCD. 



 * A:Show measurement and time

 * B:Set analog gain

 * C:Set PWM frequencies

 * D:Set analog input calibration

 * E:Set pulses per encoder revolution

 * F:Set date and time and alarm

 * G:Do a PGN request

 * H:Show ECU addresses

 * I:Commanded address

 * J:Show this ECU DM1 codes

 * K:Show other ECU DM1 codes

 * L:Show this ECU DM2 codes

 * M:Show other ECU DM2 codes

 * N:Show this ECU name

 * O:Show other ECU name

 * P:Show this ECU identifications

 * Q:Show other ECU identifications

 * R:SAE J1939 Auxiliary valve command

 * S:Analog in to PWM

 * T:Analog in to analog out

 * U:About STM32 PLC



## How to build this STM32 PLC



 1. Download this repository

 2. Download & Install KiCad

 3. Open the `PCB` folder and open the `.pro` file with KiCAD and greate a `gerber` file of your own choice

 4. Go to your PCB manufacturer and give them the `gerber` file and let them produce the board for you

 5. Order the eletrical components from `Mouser Electronics`

 6. Once you have the eletrical components and your PCB board, it's time to solder them.

 7. Once the PCB board is finished, then install STM32CubeIDE

 8. Open the `Code` project and import the `.ioc` project file using STM32CubeIDE

 9. Flash the board with the `C` code by using ST-Link V2 connection

 10. Connect the ILI9431 touch LCD and then you are done!



## Software used



 * KiCAD: 6.0.7

 * STM32CubeIDE 1.10.1



## Status of the project

It's done. I don't plan to update this project. Everything is working and it will remain that way.