Difference between revisions of "Electronics notes/Bluetooth notes"

From Helpful
Jump to: navigation, search
(Created page with "{{Electronics notes}} {{stub}} Bluetooth works in 2.4 - 2.4835 GHz, in 79 separate 1Mhz channels Bluetooth continuously hops channels, to lessen the probaility of consisten...")
 
m (Headphones (and speakers))
(3 intermediate revisions by the same user not shown)
Line 1: Line 1:
 
{{Electronics notes}}
 
{{Electronics notes}}
 
{{stub}}
 
 
 
Bluetooth works in 2.4 - 2.4835 GHz, in 79 separate 1Mhz channels
 
Bluetooth works in 2.4 - 2.4835 GHz, in 79 separate 1Mhz channels
  
 
Bluetooth continuously hops channels, to lessen the probaility of consistent interference with other devices and other protocols (in particular 2.4GHz [[WiFi]]).
 
Bluetooth continuously hops channels, to lessen the probaility of consistent interference with other devices and other protocols (in particular 2.4GHz [[WiFi]]).
 
Busy areas still have congestion problems, though.
 
Busy areas still have congestion problems, though.
 +
 +
 +
{{stub}}
 +
==Versions and speed==
  
 
Maximum speed:
 
Maximum speed:
Line 16: Line 17:
 
* Bluetooth 5 2 Mbit/s
 
* Bluetooth 5 2 Mbit/s
 
-->
 
-->
 +
 +
 +
 +
==Range==
 +
Range is primarily a function of output power, and is either:
 +
 +
 +
'''Class 2''': ~9m, which is what many portable devices do (PDAs and in particular most headsets) {{comment|(...which is arguably primarily helpful, both to limit collision/congestion, and to limit power use)}}
 +
 +
 +
'''Class 1''': Up to ~100m, though in practice it may be more like ~30m. Dongles may well be class 1
 +
 +
==Audio==
 +
 +
 +
[[Category:Hardware]]

Revision as of 18:52, 10 November 2019

This is for beginners and very much by a beginner. It's meant to try to cover hobbyist needs, and as a starting point to find out which may be the relevant details for you, not for definitive information.

Some basics and reference: Volts, amps, energy, power · Ground · batteries · resistors · changing voltage · transistors · fuses · diodes · varistors · capacitors · inductors · transformers · baluns · amplifier notes · frequency generation · skin effect


And some more applied stuff:

IO: wired local IO wired local-ish IO · · · · Shorter-range wireless (IR, ISM RF, RFID) · bluetooth · 802.15 (including zigbee) · 802.11 (WiFi) · cell phone


Sensors: General sensor notes, voltage and current sensing · Knobs and dials · Pressure sensing · Temperature sensing · humidity sensing · Light sensing · Movement sensing · Capacitive sensing · Touch screen notes

Actuators: General actuator notes, circuit protection · Motors and servos · Solenoids

Some stuff I've messed with: Avrusb500v2 · GPS · Hilo GPRS · JY-MCU · DMX · Thermal printer

Audio notes: basic audio hacks · microphones · amps and speakers · device voltage and impedance, audio and otherwise ·

Less sorted: Common terms, useful basics, soldering · Microcontroller and computer platforms · Arduino and AVR notes · ESP series notes · Electronics notes/Phase Locked Loop notes · mounts, chip carriers, packages, connectors · signal reflection · pulse modulation · electricity and humans · Unsorted stuff


See also Category:Electronics.

Bluetooth works in 2.4 - 2.4835 GHz, in 79 separate 1Mhz channels

Bluetooth continuously hops channels, to lessen the probaility of consistent interference with other devices and other protocols (in particular 2.4GHz WiFi). Busy areas still have congestion problems, though.


This article/section is a stub — probably a pile of half-sorted notes, is not well-checked so may have incorrect bits. (Feel free to ignore, fix, or tell me)

Versions and speed

Maximum speed:

  • Bluetooth 1.1 and 1.2 versions is 1mbit in theory, ~700Kbit/s in practice
  • Bluetooth 2.2 can reach ~1 to 3Mbit,
  • Bluetooth 3 HS can do ~24mbit in theory, 3 plain is still ~3MBps
  • Bluetooth 4 didn't really change speed(verify), but changed low power details


Range

Range is primarily a function of output power, and is either:


Class 2: ~9m, which is what many portable devices do (PDAs and in particular most headsets) (...which is arguably primarily helpful, both to limit collision/congestion, and to limit power use)


Class 1: Up to ~100m, though in practice it may be more like ~30m. Dongles may well be class 1

Audio