MarcusN/pico_plotter
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feat: add pen (HI-Z and PD) and serial com

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Marcus Nordström
2025-05-28 19:55:13 +02:00
parent 2e3e0e316b
commit 080d837b85
1 changed files with 22 additions and 8 deletions
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28
code.py
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@@ -4,11 +4,23 @@ import usb_cdc
import pwmio import pwmio
import digitalio import digitalio
pwm_X = pwmio.PWMOut(board.GP17, frequency=1000, duty_cycle=0) settling_time = 0.01 # Measured on the scope
pwm_Y = pwmio.PWMOut(board.GP18, frequency=1000, duty_cycle=0) pen_time = 0.1
pen = digitalio.DigitalInOut(board.GP16)
# GP20 is purple
pwm_Y = pwmio.PWMOut(board.GP20, frequency=1000, duty_cycle=0)
# GP10 is blue
pwm_X = pwmio.PWMOut(board.GP10, frequency=1000, duty_cycle=0)
pen = digitalio.DigitalInOut(board.GP8)
def set_pen_state(enable_low):
if enable_low:
pen.direction = digitalio.Direction.OUTPUT pen.direction = digitalio.Direction.OUTPUT
pen.value = False # Set pen to up position pen.value = False # Set to LOW
else:
pen.direction = digitalio.Direction.INPUT # Set to HI-Z
time.sleep(pen_time)
def message_handler(msg): def message_handler(msg):
parts = msg.split(',') parts = msg.split(',')
@@ -16,9 +28,11 @@ def message_handler(msg):
print("Invalid message format") print("Invalid message format")
return return
print(f"X: {parts[0]}, Y: {parts[1]}, Pen: {parts[2]}") print(f"X: {parts[0]}, Y: {parts[1]}, Pen: {parts[2]}")
pen_state = True if int(parts[2]) == 1 else False
set_pen_state(pen_state)
# Set pen before setting the PWM values to not get weird lines.
pwm_X.duty_cycle = int(parts[0]) pwm_X.duty_cycle = int(parts[0])
pwm_Y.duty_cycle = int(parts[1]) pwm_Y.duty_cycle = int(parts[1])
pen.value = True if int(parts[2]) == 1 else False
print("Booted") print("Booted")
while True: while True:
@@ -26,6 +40,6 @@ while True:
data = usb_cdc.data.read(usb_cdc.data.in_waiting) data = usb_cdc.data.read(usb_cdc.data.in_waiting)
message = data.decode('utf-8').strip() message = data.decode('utf-8').strip()
message_handler(message) message_handler(message)
time.sleep(0.5) time.sleep(settling_time)
usb_cdc.data.write(b"OK\n") usb_cdc.data.write(b"OK\n")
time.sleep(0.1) time.sleep(0.01)