Experimental shield

Description (from the top to the bottom):

  7 – not used
  6 – not used
  5 – pin 0
  4 – pin 1
  3 – not used
  2 – +5 V
  1 – GND

Datasheet 74HC595 is here.

Workflow:

  Write to Latch – PB5, LOW - begin of write, HIGH - end of write
  Clock pulse – PA8
  Serial data – PA9 – 2× 8 bits (2× Byte)

1st Byte – segment data – LOW - LED segment in on, HIGH - LED segment is off

2nd Byte - display address (from the left):

  1. – ××××0001
  2. – ××××0010
  3. – ××××0100
  4. – ××××1000

Serial data order: from MSB (most significant bit)

Nucleo (Arduino) reset.

LOW - LED is on, HIGH - LED is off LED description (from the top to bottom)

  LED D1 – PA5
  LED D2 – PA6
  LED D3 – PA7
  LED D4 – PB6

Connects PullUp rezistor of 10 kΩ to pin PA4 (2nd pin of 7b socket)

7a (from the left)

  1 – pin 2
  2 – GND
  3 –  +5 V

7b (from the left) Sensors: Dallas 18B20 or LM35

  1 – GND
  2 – PA4
  3 – +5 V

Potentiometer with resistance of 10 kΩ between +5 V and GND, driver connected to PA0

Connects PullUp resistors (10 kΩ) to buttons S1, S2 a S3 (see 11)

Description (from the left)

  1st column – GND (all 4 pins)
  2ns column – +5 V (all 4 pins)
  3rd column (from the top) – pin 5, pin 6, pin 9 and pin A5

  LOW on the input pin when pressed
  one may connect PullUps (see 9)

Description (from the left)

  Button S1 – PA1
  Button S2 – PA4
  Button S3 – PB0