TM1638 display module issue

[Zim]

Just a little note. Using io15 prevents ESP8266 from booting. io14 works fine. ( for me that is)
Thanks
Zim

2022-09-30 18_43_14-Window.jpg

[cicciocb]

Zim, you are right, the choice of the pin GPIO15 in the example hasn't been a good choice.
The pin GPIO15 is involved in the boot process (as described here) and should be at GND during boot (with a pulldown resistor, for example).
https://docs.espressif.com/projects/esp ... ction.html

[Oli]

I want to use the board
I don't manage to use the 2 display separately.
Variable A for the first part, variable B for the 2nd part.
e.g. I would like to display in the first 4 Digit Volt and in the 5-8 Digit ampere.
I can currently display a variable via all 8 digit if it is big enough.
How can I split this?

[BeanieBots]

This should work.
The first 3 digits are 10,000 times greater than the subsequent digits.
So, If A is what you want on the first 3 digits and B is what you want on the last digits and C is what is sent to the display.
A=volts
B=amps
C=10000*A + B
Then send C to the display.

[cicciocb]

I want to use the board
I don't manage to use the 2 display separately.
Variable A for the first part, variable B for the 2nd part.
e.g. I would like to display in the first 4 Digit Volt and in the 5-8 Digit ampere.
I can currently display a variable via all 8 digit if it is big enough.
How can I split this?

You can use the function str$ as shown below.
In this example the display is split in 2 parts composed of 3 digits ("%3.0f") with a space in the middle

Code: [Local Link Removed for Guests]

volt = 123
amp = 456

s$ = str$(volt, "%3.0f") + " " + str$(amp, "%3.0f")
wlog s$

volt = 23
amp = 56
s$ = str$(volt, "%3.0f") + " " + str$(amp, "%3.0f")
wlog s$

volt = 3
amp = 4
s$ = str$(volt, "%3.0f") + " " + str$(amp, "%3.0f")
wlog s$

[Oli]

This is a functioning demo, it is made very easy for better understanding.

I hope it helps someone, have fun ...

Code: [Local Link Removed for Guests]

tm1638.setup 5, 17, 16
   'Press the Buttons, see LED

 
volt =  59.678 '-99 to 999.9
amp  =  77.667 '-99 to 999.9 or 1000-9999 the comma run over the end

anf:

s$ = str$(volt, "%5.1f") + str$(amp, "%5.1f") 
tm1638.print s$
wlog s$

volt = volt + 0.1
amp = amp - 0.1


a = tm1638.buttons
tm1638.leds(a)
pause 200
goto anf
end

[Oli]

Hello,
Is it possible to use the IC completely?
It is very easy to solder on K1 and K2 (K3 is used for the keys).
SEG10 is also free, you could still solder 7 optocouplers or LEDs.
TM1638.LEDS2 or 8 more bits
A = TM1638.Buttons2
A = TM1638.Buttons3 or more bits at TM1638.Buttons

[cicciocb]

Hello,
Is it possible to use the IC completely?
It is very easy to solder on K1 and K2 (K3 is used for the keys).
SEG10 is also free, you could still solder 7 optocouplers or LEDs.
TM1638.LEDS2 or 8 more bits
A = TM1638.Buttons2
A = TM1638.Buttons3 or more bits at TM1638.Buttons

No, it is not possible