diff --git a/C/Bluepill_Projects/.gitignore b/C/Bluepill_Projects/.gitignore
new file mode 100644
index 0000000..1159b2d
--- /dev/null
+++ b/C/Bluepill_Projects/.gitignore
@@ -0,0 +1,4 @@
+.pio
+.clang_complete
+.gcc-flags.json
+.ccls
diff --git a/C/Bluepill_Projects/Makefile b/C/Bluepill_Projects/Makefile
new file mode 100644
index 0000000..71e9e6e
--- /dev/null
+++ b/C/Bluepill_Projects/Makefile
@@ -0,0 +1,21 @@
+# Uncomment lines below if you have problems with $PATH
+#SHELL := /bin/bash
+#PATH := /usr/local/bin:$(PATH)
+
+all:
+	platformio -f -c vim run
+
+upload:
+	platformio -f -c vim run --target upload
+
+clean:
+	platformio -f -c vim run --target clean
+
+program:
+	platformio -f -c vim run --target program
+
+uploadfs:
+	platformio -f -c vim run --target uploadfs
+
+update:
+	platformio -f -c vim update
diff --git a/C/Bluepill_Projects/README.md b/C/Bluepill_Projects/README.md
new file mode 100644
index 0000000..10a6004
--- /dev/null
+++ b/C/Bluepill_Projects/README.md
@@ -0,0 +1 @@
+# STM32F103C8T6 using the libOpenCM3 library
diff --git a/C/Bluepill_Projects/include/README b/C/Bluepill_Projects/include/README
new file mode 100644
index 0000000..194dcd4
--- /dev/null
+++ b/C/Bluepill_Projects/include/README
@@ -0,0 +1,39 @@
+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html
diff --git a/C/Bluepill_Projects/lib/README b/C/Bluepill_Projects/lib/README
new file mode 100644
index 0000000..6debab1
--- /dev/null
+++ b/C/Bluepill_Projects/lib/README
@@ -0,0 +1,46 @@
+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in a an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html
diff --git a/C/Bluepill_Projects/platformio.ini b/C/Bluepill_Projects/platformio.ini
new file mode 100644
index 0000000..f5acf22
--- /dev/null
+++ b/C/Bluepill_Projects/platformio.ini
@@ -0,0 +1,15 @@
+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:bluepill_f103c8]
+platform = ststm32
+board = bluepill_f103c8
+framework = libopencm3
+extra_scripts = post:extra_scripts.py
diff --git a/C/Bluepill_Projects/src/miniblink.c b/C/Bluepill_Projects/src/miniblink.c
new file mode 100644
index 0000000..9ff137c
--- /dev/null
+++ b/C/Bluepill_Projects/src/miniblink.c
@@ -0,0 +1,25 @@
+// blink test
+
+/*
+ * Code to blink the led connected to PC13
+ */
+
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/rcc.h>
+
+static void gpio_setup(void) {
+  rcc_periph_clock_enable(RCC_GPIOC);
+
+  gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL,
+                GPIO13);
+}
+
+int main(void) {
+  int i;
+  gpio_setup();
+  while (1) {
+    gpio_toggle(GPIOC, GPIO13);
+    for (i = 0; i < 100000; ++i)
+      __asm__("nop");
+  }
+}