| 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: IO and wired communication · localish communication ·
wireless (ISM RF, GSM, RFID, more) · 802.11 (WiFi) · 802.15 (including zigbee)
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 ·
Some stuff I've messed with: Avrusb500v2 ·
Hilo GPRS ·
Bluetooth serial ·
basic audio hacks ·
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 ·
See also Category:Electronics.
| This article/section is a stub — probably a pile of half-sorted notes, is not well-checked so may have incorrect bits.
Meant for any conductor -- anything that can be/influence capacitance, meaning fingers or anything with a conductive tip - from specific styluses to sausages in latex gloves.
Designs usually try to only be sensitive to very nearby things (not far beyond a protective plastic/glass layer.
Has a few subtypes -- see capacitive sensing.
One of them can be multi-touch, and multi-touch tablets are very usually capacitive.
Touch capacitive can be faster and more responsive than resistive.
Some of the simpler/cheaper designs are less accurate than resistive, though.
The screen itself can be built in a more robust way than resistive (sensors are under the top glass, not part of the top layer as in resistive).
Went from rare to pretty common in a few years (late noughties). Used e.g. in trackpads, and recently quite a bit in MP3 players, phones (although resistive can be better for handwriting recognition).