hydronics2
commented
4 years ago did you start with the example code... test_shift_registers? https://github.com/hydronics2/2019-easy-bee-counter/blob/master/arduino/test_shift_registers/test_shift_registers.ino
yeah... it looks like Adafruit wrote a little library for the shift out register 74hc595... It might be helpful to start from this code... buy yeah writing your own library as a beginner programmer can be a bit daunting! Maybe post to the arduino forum and see if anyone wants to give you some pointers? There are lots of helpful people there...
Try posting your question here: https://forums.adafruit.com/viewforum.php?f=60 If you copy me on your post/answer I'll try to help out too.
On Thu, Jun 11, 2020 at 2:26 AM jhn4 notifications@github.com wrote:
Hello, i tried to translate your code into micropython, i'm not a vey experienced coder, I dont get it to work really. I'm using the Fipy micro controller from pycom, i don't know if you are familiar with it? This is the code that i almost copied from your arduino code, it's the same expect how things are written in micropython. The issue i got is that i don't get anything from the sensors, they're always 0. That makes me think that the issue is in the serial connection.
from machine import Pin import utime
How many shift register chips are daisy-chained.
NUMBER_OF_SHIFT_CHIPS = 3
Width of data (how many ext lines)
DATA_WIDTH = NUMBER_OF_SHIFT_CHIPS * 8
Width of pulse to trigger the shift register to read and latch.
PULSE_WIDTH_USEC = 5
Optional delay between shift register reads.
POLL_DELAY_MSEC = 1
pinValues = 0 oldPinValues = 0
def read_shift_regs(): bitVal = 0 bytesVal = 0 ploadPin.value(0) utime.sleep_us(PULSE_WIDTH_USEC) ploadPin.value(1)
for i in range(DATA_WIDTH): bitVal = dataPin.value() # Set the corresponding bit in bytesVal. print(i,bitVal,bytesVal) bytesVal |= (bitVal << ((DATA_WIDTH-1) - i)) clockPin.value(1) utime.sleep_us(PULSE_WIDTH_USEC) clockPin.value(0) return bytesValdef display_pin_values(): print("Pin states: ") for i in range(DATA_WIDTH): if(pinValues >> i & 1): print(" Pin-" ,i ,": HIGH") else: print(" Pin-" ,i ,": LOW") print("\r\n")
Set up
ploadPin = Pin('P2', mode=Pin.OUT) #Blue clockPin = Pin('P14', mode=Pin.OUT) #Purple dataPin = Pin('P4', mode=Pin.IN) #Yellow
clockPin.value(0) ploadPin.value(1) pinValues = read_shift_regs() display_pin_values() oldPinValues = pinValues while True: pinValues = read_shift_regs() if(pinValues != oldPinValues): print("Pin value change detected*\r\n") print(pinValues) display_pin_values() oldPinValues = pinValues utime.sleep_ms(POLL_DELAY_MSEC)
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jhn4
Hello, i tried to translate your code into micropython, i'm not a vey experienced coder, I dont get it to work really. I'm using the Fipy micro controller from pycom, i don't know if you are familiar with it? This is the code that i almost copied from your arduino code, it's the same expect how things are written in micropython. The issue i got is that i don't get anything from the sensors, they're always 0. That makes me think that the issue is in the serial connection.