Electronics project notes/JY-MCU notes

⚠ This is for beginners and very much by a beginner / hobbyist It's intended to get an intuitive overview for hobbyist needs. It may get you started, but to be able to do anything remotely clever, follow a proper course or read a good book. Some basics and reference: Volts, amps, energy, power · batteries · resistors · transistors · fuses · diodes · capacitors · inductors and transformers · ground Slightly less basic: amplifier notes · varistors · changing voltage · baluns · frequency generation · Transmission lines · skin effect And some more applied stuff: IO: Input and output pins · wired local IO · wired local-ish IO · ·  Various wireless · 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 Noise stuff: Stray signals and noise · sound-related noise names · electronic non-coupled noise names · electronic coupled noise · ground loop · strategies to avoid coupled noise · Sampling, reproduction, and transmission distortions Audio and video notes: See avnotes Platform specific Arduino and AVR notes · (Ethernet) Microcontroller and computer platforms ··· ESP series notes · STM32 series notes Less sorted: Ground · device voltage and impedance (+ audio-specific) · electricity and humans · Soldering · landline phones · pulse modulation · PLL · Multimeter notes · signal reflection · Project boxes · resource metering · Radio and SDR · vacuum tubes · Unsorted stuff · 'E-fuse' Some stuff I've messed with: Avrusb500v2 · GPS · Hilo GPRS · JY-MCU · DMX · Thermal printer · See also Category:Electronics.

"JY-MEGA16/32"

This is a vaguely arduino-like board, but with some buttons and leds already there, making some basic interfaces a little less work.

(I have a DEMO V1.2, but different versions are probably equivalent)

Mostly consists of:

• ATmega32/L [1] (which can operate at 3V and 5V, configured at 3V(verify))
• 3.3V regulator (662K regulator) so you can power it from ~5V
• 16MHz oscillator

• 17x2 pins exposing V_cc, Gnd, and all 32 pins on ports A,B,C,D
• ISP header
• JTAG header

• 1 power LED
• 8 LEDs (on port B)
• 5 buttons
  • one of which is reset
  • the other four are (on which port?)

• USB mini-B socket
  • Useful for 5V power
  • Apparently the controller comes with a bootloader that implements USB HID device, so you can upload
    • press S4 on reset?(verify))
    • Attached to which pins?
    • (I didn't know this and program without bootloader using ISP)

"JY-LKM1638"

Board with

• a TM1638 (LED driver and keypad scan interface), with a bidirectional serial interface

• eight 7-segment characters
• eight (dual color?) LEDs
• eight buttons

Has a header to make it chainable with more of the same