Hello all! I'm fairly new when it comes to Arduino electronic projects. I was just hoping that someone could just explain some things to me so that I could get a project I found implemented. I think it should be easy to understand for other people.
So basically, I have an AtTiny85 that will be hooked up to an RN-42 and will be sending/receiving messages. I know that the bluetooth module is 3.3v and the the AtTiny is 5v, which isn't good in the world of electronics, but the project creator said it shouldn't be a project.
Here's the couple questions I have:
1. So to start, this is the schematic I was given
It says that the RN-42 needs connections to RX, TX, and Reset. Is what I have marked in this picture correct?
2. What does it mean to bridge the RN-42's CTS and RTS?
3. In the schematic, the AtTiny85 is the only one connected to 3.3v power, while the RN-42 is not. Will the AtTiny85 be powering the RN-42 through one of the three lines it's connected to? Unfortunately neither the AtTiny85 and RN-42 give any kind of indication that they are on, so I don't want to be confused later on.
4. Finally, I was wondering, what is the best jumper wire to use to solder everything? I have THIS set from Amazon, but based on these other pictures I found of very similar projects, they use a wire that is a lot thicker and it has silver wire on the inside as opposed to copper wire like in the Amazon ones.
Have you looked at https://www.sparkfun.com/datasheets/Wireless/Bluetooth/rn-42-ds.pdf, I think its best to have a copy of that sheet on your computer. Page 5 shows a typical connection.
Number 1 looks good.
Number 2 to bridge the RN-42's CTS and RTS solder a jumper wire from CTS to RTS on the module.
Number 3, the module runs, as per the data sheet on 3.3V, you'll need power wire and ground wire to from module to tiny.
Number 4, project creators choice. I typically use 30g wire for on module or proto-board connections and 24g for board to board connections, and 22g for power and ground, for a project like this.
So basically, I have an AtTiny85 that will be hooked up to an RN-42 and will be sending/receiving messages. I know that the bluetooth module is 3.3v and the the AtTiny is 5v, which isn't good in the world of electronics, but the project creator said it shouldn't be a project.
If you bootload the Tiny85 to run off the 8MHz internal oscillator (or 8MHz external crystal) the Tiny85 can run at 3.3V.
groundFungus:
If you bootload the Tiny85 to run off the 8MHz internal oscillator (or 8MHz external crystal) the Tiny85 can run at 3.3V.
Thank you for letting me know that that's possible. Would I achieve this just by connecting the AtTiny85 through an uno, changing clock to "8MHz (internal)" and selecting "Burn Bootloader" on the Arduino IDE? I found this link and I think that's what this guy tried to do too Arduino Project Hub
I don't know if that's all I need to do, but I read that I should not pick the external option as I have no external hardware attached
"Silver" wire is usually copper wire pre-coated with a thin layer of solder. This makes it easier to solder than pure copper.
This process is called "tinning" since the solder is mostly made of the metal tin. You should usually use tinned wire when you are soldering.
You can tin wire yourself if it is not pre-tinned. After stripping the insulation but before putting it in the hole or whatever, touch it with your soldering iron and a tiny amount of solder. This will make it easier to solder into its final position.
