But, if I need a DAC in my project
do I have to drop my Arduino UNO R3?
In the previous days we saw...
...methods to work with digital signals...
e.g. digitalWrite,
digitalRead
...and methods to work with analog signals
e.g. analogRead
Arduino UNO does not have a DAC*
*Digital to Analog Converter
which is an electrical system that allows
us
to generate analog signals
analogWrite
function is the biggest Arduino scam!
We can include an external component in our circuit
which will carry out the missing role...
...in the same way we previously
introduced LEDs in our circuits
Still a problem...
A communication protocol is a system of rules that allows two or more entities of a communications system to transmit information via any kind of variation of a physical quantity
~from wikipedia, "communication protocol" page
If you have confidence with the concept of communication protocol you probably know the OSI model
| # | Layer | Function | |
|---|---|---|---|
| Host layers | 7 | Application | High-level APIs, including resource sharing, remote file access |
| 6 | Presentation | Translation of data between a networking service and an application; including character encoding, data compression and encryption/decryption | |
| 5 | Session | Managing communication sessions, i.e., continuous exchange of information in the form of multiple back-and-forth transmissions between two nodes | |
| 4 | Transport | Reliable transmission of data segments between points on a network, including segmentation, acknowledgement and multiplexing | |
| Media layers | 3 | Network | Structuring and managing a multi-node network, including addressing, routing and traffic control |
| 2 | Data link | Transmission of data frames between two nodes connected by a physical layer | |
| 1 | Physical | Transmission and reception of raw bit streams over a physical medium |
Luckily, with a few low level protocols we can communicate with more or less any commercial "chip" or "board"
Also Arduino UNO R3
(or better its core ATMEGA328P)supports some of them