Emil's Projects & Reviews

OpenHardware & OpenSource

Entries tagged "black pill".

STM32 "Pill" boards 13th November 2020

This is a collection of pinouts and schematics for the cheap Chinese STM32 development boards available on Aliexpress and Ebay:

DemoBoard STM32F030$1.23
BluePill STM32F103$1.67
BlackPill STM32F103$2.22
BlackPill STM32F4x1$3.70
DevEBox STM32H750$10.92

Prices include shipping from Aliexpress and are based on buying lots of 10 pcs.

This entry has been cut, click to read on.

2 comments. Tags: black pill, blue pill, stm32.
CW Keyer/Decoder BlackPill/F401 23rd March 2022

The nanoKeyer project is a CW keyer based on the Arduino platform and can be operated with a PS/2 keyboard or a Iambic paddle.

I've started my own CW Keyer/Decoder project based on a BlackPill STM32F401 module because I'm not very good at Morse code (neither transmitting nor receiving) and I wanted something more sophisticated as an aid.

By taking advantage of cheap modules available on Aliexpress I propose the following schematics for a BOM of around 15$

The design will use:

Advantages:

The project schematic

2 layer PCB

The STM32F401 processor CubeMX and its documentation

Components

ARM Cortex-M4
STM32F401xC.pdf
5pcs$17.58
3.3V LCD1
16×2 lines
5pcs$11.82
or SPI LCD2
128×64 pixels
5pcs$20.35
I2S Microphone
INMP441.pdf
5pcs$10.04
I2S Speaker Amplifier
MAX98357A.pdf
5pcs$12.92
Switching Power Supply
MP1584.pdf
5pcs$3.95
Optocoupler
PC817.pdf
20pcs$2.28
Speaker
2W 8Ohm
5pcs$4.68
Rotary Encoder5pcs$2.88
Switch with Caps
12×12mm
25pcs$2.38
USB Type A
Socket
10pcs$1.52
PJ316
3 pin Socket
10pcs$1.87
PJ320a
Stereo Socket
100pcs$6.03
PCB
1.6mm 2 layers
5pcs$15.20
Aluminum Enclosure4pcs$40.73
Total$133.88

The components cost (with shipping) for one CW keyer including the PCB and the aluminium enclosure is around 25$ (or 15$ without the enclosure).

5 comments. Tags: black pill, cw.

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