Electronics

General Infos

Ebay Purchase History

Converters/Calculators

• Resistance Ω's converter
• Capacitance converter (Farads)

DSO138

stm32flash  -v -b 115200 /dev/ttyUSB0 -w 113-13801-061.hex
r2 ../src/firmware-src/libdso138.a -b16 -aarm -AA

• "Supports two types of TFT controllers (ILI9341 and ILI9325/9328)."
• Mine is a ILI9341...
• CPU is: STM32F103C8. Does not support DFU (usb bootloader).

• Calling the STM32 SystemMemory Bootloader from your application
• how to use STM32 system memory boot modes
• StackOverflow Question
• libopencm3/libopencm3-examples
• libopencm3/libopencm3
• Post on bare STM32 dev
• USB HID on STM32F042
• This might be about the bootloader...

ESP-12F Programmer

Bootloading/Usage pinouts... LM1117t Pins - Gnd Out In

FT232 with Transistor Pin out CJS - Does this need pull ups/downs?

Pins:

• EN - Always must be high.
• GPIO15 - Always must be low (Unless booting from SD card...).
• RST - Normally high? It's getting pulled down by UART... Maybe it's a Schmidt trigger... Seems to bootloop forever when pulled low, but only after the FTDI activates it. FTDI Pulls it low then high.
• GPIO0 - Boot Pin. High when normal. Low for bootloader.

On pulling resistors "A 2K resistor gives better noise immunity."

Capacitors

This info on LM1117 capacitors....

• The minimum output capacitance required by the LM1117 is 10µF...
• The ESR of the output capacitor should range between 0.3Ω - 22Ω.
• The ESR of the output capacitor should be less than 0.5Ω.
• Tantalums were specified because Electrolytic can have their ESR increase up to 30x on very low temps.

I have:

• Polyester Film (YELLOW) - 1nF->470nF @ 100 Volts
• Polyester Film (Green) - 1nF->68nF @ 630 Volts
• CBB Polypropylene Metal Film (Brown & Blue) - 1nF->2200nF @ 630 Volts
• 0402 SMD Ceramic - 1pF->0.033uF @ 50 Volts
• 0805 SMD Ceramic - 1pF-22uF (ON ORDER).
• SMD Aluminum Electrolytic Capacitor Assorted - 1uF-220uF (Various voltages, 16-63)
• Ceramic Capacitors - 3p->100nf
• Plastic + Copper Electrolytic Capacitors - 1uF->470uF (Some says ESR is low...)

Maybe get some non-SMD MLCCs? Tantalums?

Misc

Controlling Lots of Outputs from a Microcontroller and lost of other's on the blog. Transistor Tester

Simple Latch MOSFET

Example

Exaple+Load

Another Example

More

moar2

touch protection

touchp2

SCR based test

Pull down to voltage 5 volts

Simple pull down

Resister Ladder

[1]

Basic Resistor Ladder

reversed

Ladder +12v input

Unchained Ladder with 12v

Unchained Ladder e12 + 12v

Complete

complete

Complete2

Complete 3

Complete 4

c5

c6

Stripboard

s1

s2

s3

S4

s5

s6 - flipped board

s7

s8

Negative voltage

[2]

FPGA

ICE40 UL1k