ESP32-WROOM-32

[VladimirAstrelin]

Dear Sirs, thanks a lot for your great libraries for TM1637 & TM1638. Everything works just fine except keys(buttons) in your library for TM1638.

while True:
    pressed = tm.keys()
    for i in range(8):
        tm.led(i, (pressed >> i) & 1)
    sleep_ms(10)

This piece of code doesn't turn on LEDs on the board. Please let me know what might go wrong. Many thanks in advance, Vlad, Ukraine.

[mcauser]

Hi @VladimirAstrelin which board are you using the library with?

[VladimirAstrelin]

Dear Sir, I use ESP32-WROOM-32 as I mentioned in the subject to my message. Here's a little more detailed description: ESP32 Type-C CH340 2.4GH Dual Mode WiFi+Bluetooth Dual Core ESP32-WROOM-32 Dev Board Thanks for answering my message. I hope my reply will help. Thanks again for your libraries ! I would like to understand better how they work. Warmest regards, Vlad, Ukraine.

[mcauser]

Hi, I meant, which TM16xx board were you trying to use this library with. Not the microcontroller using it.

[VladimirAstrelin]

I use this one:

https://www.aliexpress.com/i/32893633739.html

TM1638 Key Module 8-Bit Digital LED Display Tube Module Board 7 Segment 8 Bits RED TM1638 KEY LED Display Panel

Thanks for your support.

[mcauser]

I am using the same board. I just tried your code on mine and it works as expected.

• Press S1 and LED 1 lights up.
• Press S2 and LED 2 lights up.

Hopefully they haven't changed any wiring on newer boards. Mine is a few years old now.

You could try power cycling the board:

tm.power(0)
tm.power(1)
tm.led(0,1)

You can try calling tm.write() to see if it turns the correct LEDs on. It expects a byte array of up to 16 bytes.

byte0 - 1st 7 segment (below LED1)
byte1 - LED1
byte2 - 2nd 7 segment
byte3 - LED2
byte4 - 3rd 7 segment
byte5 - LED3
...
byte14 - 8th 7 segment (right most)
byte15 - LED8

Turn all segments and LEDs on:

tm.write(bytearray([255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255]))

Turn all segments on, all LEDs off:

tm.write(bytearray([255,0,255,0,255,0,255,0,255,0,255,0,255,0,255,0]))

Turn all LEDs on, all segments off:

tm.write(bytearray([0,255,0,255,0,255,0,255,0,255,0,255,0,255,0,255]))
# only the LSB is used, so effectively the same as:
tm.write(bytearray([0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1]))

If you press and hold S1 and call tm.keys() does it give you 1? Hold both S1 and S2 and you should get 3.

[VladimirAstrelin]

1) If you press and hold S1 and call tm.keys() does it give you 1? --- No, it doesn't. It gives zero. What pins on ESP32 do you use for STB, CLK and DIO ? What's the role of STB ? Maybe the problem with keys is about wrong wiring of STB ? 2) LEDs ( LED1...LED8) work fine, Seven-segmen LEDs work fine...but keys do not react...nothing happens when I press them..

[VladimirAstrelin]

Here is the photo on My ESP32 with TM1638 board, as you can see ALL LEDs and 7-segments are working just fine. But keys do not react at all. Here is the link to the photo: https://drive.google.com/drive/folders/11qr3VCV6V0n5WOEQ1qmSY4h-VdYr-_5w?usp=sharing Here is my code:

from time import sleep_ms from machine import Pin import tm1638

tm = tm1638.TM1638(stb=Pin(13), clk=Pin(22), dio=Pin(21))

turn them on, one by one

for i in range(8): tm.led(i, 1) sleep_ms(200)

turn them off, one by one

for i in range(8): tm.led(i, 0) sleep_ms(200)

toggle 1st LED

tm.led(0, 1) tm.led(0, 0)

toggle the 2nd LED

tm.led(1, True) tm.led(1, False)

turn on only the 4th LED

tm.leds(8)

turn on only the first 3 LEDs

tm.leds(7)

every 2nd led on

for i in range(10): tm.leds(0b01010101) sleep_ms(100) tm.leds(0b10101010) sleep_ms(100)

leds off

tm.leds(0)

THIS PART BELOW DOESN'T WORK:

while True: pressed = tm.keys() for i in range(8): tm.led(i, (pressed >> i) & 1) sleep_ms(10)

[mcauser]

STB is strobe, DIO is data in/out, CLK is clock.

I'm using a TinyPICO ESP32 with pins:

tm = tm1638.TM1638(stb=Pin(5), clk=Pin(18), dio=Pin(23))

So it looks like it's mostly working. I think it might be trying to loop too fast. Try increasing the sleep_ms(10) to 500 and see if that works. 10ms works fine on mine. Just trying to rule that out.

Little test I put together, which prints whats happening inside tm.keys()

def test():
    tm.stb(0)
    tm._byte(66)
    for i in range(4):
        print(tm._scan_keys())
    tm.stb(1)

Press = 4x printed values
S1 = 1 0 0 0
S2 = 0 1 0 0
S3 = 0 0 1 0
S4 = 0 0 0 1
S5 = 16 0 0 0
S6 = 0 16 0 0
S7 = 0 0 16 0
S8 = 0 0 0 16