Electronics

General Infos

EBay Electronic Components

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...

Blinky Makefile Examples Some other examples

• LM1117t Pins - Gnd Out In
• S9013 - EBC

FT232 with Transistor Pin out parent 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."

"esptool uses the RTS and DTR modem status lines to automatically enter the bootloader. Connect RTS to CH_PD (which is used as active-low reset) and DTR to GPIO0."

esptool guide

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

Oscilloscopes/ADC/DAC/stuff

• HMCAD1511 - Highspeed, 8bit ADC 4channel. - $96.14
• HC4053M - High Speed CMOS Logic Analog Multiplexers/Demultiplexers - < $1
• [Mcp4725] - Cheap 12-Bit Digital to Analogue converter. $1.50 boards on ebay from Foosoo.
• AD5207 - 2-Channel, 256-Position Digital Potentiometer SPI.
• AD9288 - 8-Bit, 40/80/100 MSPS Dual A/D Converter ~$14 on ebay. Was on the DS1052E Rigol.

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