Hello
I want to connect for example ultrasonic sensor, led matrix, 4digit7seg display and servo to arduino uno. But pins in the board are lacking. What can I do whith it?
And do I need some addon boards either I just can replace arduino uno board whith smth another like esp32 mb?
Thanks so far)
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Thanks in advance for your cooperation.
The analog inputs are also digital GPIO pins. So, not counting the serial pins, there are 18 digital GPIO pins available on an Uno. How many do you need?
Do not power the servo with the Uno.
let's say 16 for led matrix, 8 for 4digit7seg display, mb lcd display too, this is plus 2 pins, ultrasonic + 2 pins, if not count servo than maybe that's all. But let's say further I may do project in which will be used several matrixes, then how to deal?
I thought about idea to connect arduino uno board to nano somehow?
You could get a mega.
Look up Arduino mega?
It has like 50+ digital pins IIRC.
+1 on using a Mega.
If you want to stick with Uno, I think that it is easier to add digital GPIO pins using I2C or SPI IO expanders or shift registers than to use more Arduino boards and deal with the communication hassles.
I2C expanders like the MCP23008 (8bit) or MCP23018 (16bit) or PCF8574
SPI IO expanders like the MCP23S08 or MCP23S18.
Shift registers like 74HC595 (parallel in, serial out, 8 bit), 74HC165 (parallel in, serial out, 8 bit), 74HC164 (serial in, parallel out, 8 bit).
Thanks for suggestion
I'll study this theme
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