Arduino Best expander Input/Output | GPIO Expansion module | MCP23017, MCP23S17 

Thanks 🙈

Thanks 🙈

Merci 🙈

Do you have any suggestions about some AD devices? I'm doing digital all the time but I have some interest to make some analog modules so any recommendations from you will be very appreciated

That's a good point to highlight, I got the inputs to interpret the clicks through logic edge because edges appear one time but logic level is continuous so I suggest you add a boolean variable as a flag for each input reading and add it to the input read if() statement so for example instead of writing if(digitalRead(input)) { Serial.println("message"); } You write if(digitalRead(input)&&flagInput) { Serial.println("message"); flagInput=0; } if(!digitalRead(input)) { flagInput=1; } This way the flagInput variable will ensure that we get the message one time only once the input is high. This will cost you some of the dynamic memory of your MCU due to variables use. Instead you could add a short delay of around 200 ms just inside the "if" statement so it becomes like this if(digitalRead(input)) { delay(200); Serial.println("message"); } But this will keep you getting the message on the serial as long as the button is clicked. I hope this is clear

@@DIYGUYChris that is how I handle "Button Presses" too

@DIYGUYChris well, except the delay, I despise delay in microcontroller code. I either use Millis or interrupts with a simple Finite State Machine logic to give the illusion of "pauses or delays" but still have processor "free" to provide a multi task feel. This becomes VERY important when you want to react quickly to things like button presses, especially of you have a bunch of them

Thanks 🙏

Yeah, soldering was challenging because of the tiny components size 🙈

Sure thing, it is as same as you set the arduino pin I/O

As always continued support 🙈

You can make 3D printer without any need of expansion : )

@@DIYGUYChris But for a 3d printer usually you have to have at least one stepper per axis and an extra for the extruder, i think the pico doesn't have that much IO pins

@@luizpollo you will not get the steppers powered directly from Pico, there you will have stepper motor drivers, A4988 is one of these drivers. In this case no need for extra GPIOs

Indeed

@@DIYGUYChris Hello, thank you very much for your feedback 😁. Have a nice weekend 😄. Cordially.

Do you mean the TMUX7219? That's a switch not an MCU.

Thanks

its exactly the same just use the i2c pins on the nodemcu

shift registers is an option

I²S is an audio communication protocal that requires an I²S data line which is not existing in MCP expander not even in other GPIO Expander because these will provide General Purpose IO but I²S is specific IO for sound. I hope you can distinguish these two terms (I²S and GPIO) !

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Thanks 🙏

You are already using the MCP23S17 in parrallel because it uses SPI communication which is already the fastest communication port for MCPs, maybe you need more software solution rather than hardware, try to read/write ports instead of reading or writing one bit at a time, it helped me to speed up the outputs writing for my MCP23017 once.

program SPI_Communication; {$APPTYPE CONSOLE} uses SysUtils, Windows; const FT232RL_VENDOR_ID = $0403; FT232RL_PRODUCT_ID = $6001; SPI_MODE_0 = 0; SPI_MODE_1 = 1; SPI_MODE_2 = 2; SPI_MODE_3 = 3; type TTransferOptions = record Pin: byte; Mode: byte; BitsPerWord: byte; Speed: DWORD; end; var hDevice: THandle; TransferOptions: TTransferOptions; MCP23S17_ADDRESS: byte; IODIRA: byte; IODIRB: byte; GPIOA: byte; GPIOB: byte; procedure SpiInit; begin // set SPI mode 0 TransferOptions.Mode := SPI_MODE_0; // set SPI clock speed to 1 MHz TransferOptions.Speed := 1000000; // set bits per word to 8 TransferOptions.BitsPerWord := 8; end; procedure SpiTransfer(address, registerAddress, data: byte); var Buffer: array[0..2] of byte; BytesTransferred: DWORD; begin Buffer[0] := address or $80; // set MSB to 1 for write operation Buffer[1] := registerAddress; Buffer[2] := data; // perform SPI transfer if not DeviceIoControl(hDevice, $22200b, @TransferOptions, SizeOf(TransferOptions), @Buffer, SizeOf(Buffer), BytesTransferred, nil) then Writeln('Error: ', SysErrorMessage(GetLastError)); end; procedure MCP23S17Init; begin // set IO direction of Port B as output SpiTransfer(MCP23S17_ADDRESS, IODIRB, 0); end; procedure MCP23S17Write(data: byte); begin // write data to Port B SpiTransfer(MCP23S17_ADDRESS, GPIOB, data); end; begin // initialize FT232RL USB to serial converter hDevice := CreateFile('\\.\FTDIBUS0', GENERIC_READ or GENERIC_WRITE, 0, nil, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL or FILE_FLAG_OVERLAPPED, 0); if hDevice = INVALID_HANDLE_VALUE then begin Writeln('Error: Unable to open device!'); Exit; end; // set vendor and product IDs for FT232RL if not DeviceIoControl(hDevice, $A2320001, @FT232RL_VENDOR_ID, SizeOf(FT232RL_VENDOR_ID), nil, 0, DWORD(nil^), nil) then begin Writeln('Error: Unable to set vendor ID!'); CloseHandle(hDevice); Exit; end; if not DeviceIoControl(hDevice, $A2320002, @FT232RL_PRODUCT_ID, SizeOf(FT232RL_PRODUCT_ID), nil, 0, DWORD(nil^), nil) then begin Writeln('Error: Unable to set product ID!'); CloseHandle(hDevice); Exit; end; // set up SPI communication SpiInit; // set up MCP23S17 MCP23S17_ADDRESS := $40; IODIRA := $00

Please suggest what is the mistak in delphy code.

Indeed, it works with all MCUs

MCP23017 Breakout board

Okay

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