ESP8266 Community Forum

- Sun Aug 27, 2017 12:37 pm #69489 I can't control led with esp8266 and 74hc595 spi correctly

- Sun Aug 27, 2017 2:30 pm #69491


That is all you get. But if you provide more details then maybe you will get some help.

What framework are you using? What code have you tried. How is the 74HC595 connected? Give us a starting point for a discussion. What exactly is it doing.

- Sun Aug 27, 2017 10:31 pm #69505

:(


That is all you get. But if you provide more details then maybe you will get some help.

What framework are you using? What code have you tried. How is the 74HC595 connected? Give us a starting point for a discussion. What exactly is it doing.

sorry about that. Here it the full infomation:

I want the 4 leds control correct. here the table. I follow the video diy:
https://www.youtube.com/watch?v=MimllhWR0so

chip: esp8266, recently bin build.



code:

Code: Select alllatch_pin = 2
     
gpio.mode(3,gpio.INPUT)
gpio.mode(latch_pin, gpio.OUTPUT)
gpio.write(latch_pin,gpio.LOW)

result = spi.setup(1,spi.MASTER,spi.CPOL_HIGH,spi.CPHA_LOW,spi.DATABITS_8,0)
print(result)

index = 0

function next()
    print(index, string.format("0x%02X", index))
    spi.send(1,index)
    gpio.write(latch_pin,gpio.HIGH)
    gpio.write(latch_pin,gpio.LOW)
   
    index = index+1
    if(index>15) then
        index = 0
    end
end

next()
gpio.trig(3,"up",next)

- Tue Aug 29, 2017 4:35 am #69536

:(


That is all you get. But if you provide more details then maybe you will get some help.

What framework are you using? What code have you tried. How is the 74HC595 connected? Give us a starting point for a discussion. What exactly is it doing.

Now I understand the problem. 8266 can't support 12 pin led digital and txd together the same time.