3 years, 7 months ago.

TM1637 Seven Segment Display with Nucleo-L073RZ

Hi Wim,

I am using Nucleo-L073RZ and pin configuration set as TM1637_CATALEX CATALEX(PA_7, PA_6, PA_5) as per the document. Also used serial resistor as you advised the diagram https://developer.mbed.org/media/uploads/wim/serial_tm1637_sch.jpg. VDD is connected to 3.3v of the board and I can see serial out with menu.

But I could not see anything on the display and no issue with Arduino Uno R3 board

Could you please help me on this.

Regards Dhamodharan K

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1 Answer

3 years, 7 months ago.

The Nucleo L073 has LED1 also on the SCK pin PA_5. See pinout diagram on https://developer.mbed.org/platforms/ST-Nucleo-L073RZ/. The example code uses that same pin to toggle the LED on every main loop. That will probably be the reason it doesnt work. So either remove the declaration and code for LED1 in the example or pick another pin for SCK. Note that for this device we dont really need a hardware SPI port but instead you can use any Digital pin.

Also note that obviously the CATALEX module doesnt have any keys, but you could add them using some wires soldered onto the proper pins.

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