Created
September 28, 2015 07:02
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Using Nodemcu to drive a 74HC595 shift register
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| latch_pin = 2 | |
| 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) | |
| while true do | |
| for i=1,255,1 do | |
| print(i) | |
| spi.send(1, i) | |
| gpio.write(latch_pin, gpio.HIGH) | |
| gpio.write(latch_pin, gpio.LOW) | |
| tmr.wdclr(); | |
| tmr.delay(100000); | |
| tmr.wdclr(); | |
| end | |
| end |
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Connect Nodemcu D7 to 74HC595 Data (pin 14)
Connect Nodemcu D5 to 74HC595 Clock (pin 11)
Connect Nodemcu D2 to 74HC595 Latch (pin 12)