I'm trying to connect an Attiny84 to my computer via USB. However, I'm unclear which pins need to be connected for the QFN package? Datasheet Link
Do I need any additional components? Is there a good tutorial out there for this specific IC?
Any help would be appreciated!
The Attiny84 does not have a USB interface. The modules that use this chips have an additional microcontroller or USB chip on them to provide this functionality.
Ok thanks. Is there a tutorial somewhere on how to add a USB interface to this? What chip(s) would I need?
Have a look at the Arduino Nano Every documentation. The schematics will give you all the details you need.
The usual way is to use a so-called FTDI cable; it converts USB to TTL (and vice versa).
The ATtiny does not have an internal UART so it will be difficult to connect it to USB. I suppose you could use a software serial implementation but that would only be of use for communicating data from your code, not loading your code into it.
I have some Attiny84s that normally communicate using nRF24L01+ wireless modules and I have written some very basic bit-bang software serial code to send debug messages. I have not bothered to implement serial RX code. My objective was to minimise the amount of SRAM used.
I can't recall if the standard SoftwareSerial library works with the Attiny84.
...R
ATTinyCore has software serial bootloader for ATtiny84 and uses software serial to provide the standard Arduino HardwareSerial API:
I'm only looking to connect via USB to send commands to the Attiny84, not to upload code. For that, I'll use another Arduino to act as ISP (from what I learned).
Is there another chip I can connect to the Attiny84 to be able to plug it into my computer? Sorry for the noobish question..
shai:
I'm only looking to connect via USB to send commands to the Attiny84,
The simplest solution would be to use SoftwareSerial on the Attiny and a USB-TTL cable to connect to your PC.
...R