Monday, February 1, 2021

Simple Dupont gender changer.

As i was playing with my ST Link programmer and STM8S development boards having a simple Dupont pin Female to Female gender changes perhaps would be would be more easy than changing cables to the required gender.
Making a simple female to female was more easy than expected.

First i did think i needed to solder. However female Dupont connector headers can easy be pushed together to create an adapter.
With insulation tape you can prevent the separation on these two headers.

ST Link

STM8S207 / 103 board "Clock LEDs"

On AliExpress i also ordered the  EU-STM8S207|103-DEMO board.

This board has two STM8 controllers and several hardware items.
According to info the two STM8 controlers should be able to communicate with each other.
There is a MicroSD card holder, a W2064 Flash ram, A buzzer (Beep), LDR, One reset button. Two buttons connected to the 207 and one button connected to the 103 (on which pin??), Several connectors (e.g. for ESP01 wifi),GSM. SPI, I2C AD/DA, GDM, 207-UART1 a 207-SWIM and 103-SWIM and some other items. Also additional boards to add more hardware can be ordered.

Unfortunately i could not yet find good documentation or a schematic diagram.

After playing with a cheap STM8S103F3P6 board i decided to try out this board and connected my ST-link (shown in an earlier post) to the 103-SWIM connector. On this board the SWIM connector indicates 5V so i used 5V.  ( The STM8S103F3P6 board indicates 3V3 so there i used 3V3).

I modified the STM8S Blink sketch to the sketch below to test the output pins.


const int LED_TT = 12;

 pinMode(LED_TT, OUTPUT);

// the loop function runs over and over again forever

void loop() {

  digitalWrite(LED_TT, HIGH);   // turn the LED on (HIGH is the voltage level)

  delay(1000);                       // wait for a second

  digitalWrite(LED_TT, LOW);    // turn the LED off by making the voltage LOW

  delay(1000);                       // wait for a second



LED_TT is Led To Test
By changing the LED_TT value in the program above i could test the "Clock like arranged Leds".

Results are in the table below.

Clockwise 1-12
Pin in

Strange that the 4 and 3 are swapped. I expect Pin 10 (D10) is not used as this corresponds to SWIM in some pictures i found.