Differences

This shows you the differences between two versions of the page.

--- public:watches:watchwinder_python_code [24/05/22 07:14 BST] – gm4slv
+++ public:watches:watchwinder_python_code [Unknown date] (current) – removed - external edit (Unknown date) 127.0.0.1
@@ Line 1: / Line 1: @@
-<-[[.:start]]
-====== Watchwinder  ======
-=== Home Brew Winder ===
-I built a simple watch-winder to keep automatic watches fully wound when not being worn. Mainly as a small project to play with a pyBoard and a servo motor.
-A short piece of microPython makes the servo turn, first one direction, then then other, then a pause, at a speed that makes sure a watch is fully wound overnight. The speed depends on the required number of turns to achieve full-wind, which depends on the watch movement, and whether the movement winds in one or other, or both, rotational directions.
-The watch is placed in a plastic box attached to the servo motor and the motor is simple clamped in a ''panavise'', with the axis of the servo at about 45°
-==== Photos ====
-<WRAP col2>
-{{:public:watches:pyboard.jpg?200|}}
-{{:public:watches:winder_1.jpg?200|}}
-{{:public:watches:winder_2.jpg?200|}}
-{{:public:watches:winder_3.jpg?200|}}
-</WRAP>
-=== more to come ===
-<todo>add some photos</todo> FIXME
-=== Code ===
-microPython  code for Pyboard to control continuous rotation servo.
-<code python>
-# main.py -- put your code here!
-import pyb
-servo1 = pyb.Servo(1)
-# LED colours
-# red flash = motor stopped
-# green on = manual stop for 120 seconds
-# yellow on/flash = motor running
-# blue flash = 5 seconds before a change of state
-ledr = pyb.LED(1)
-ledg = pyb.LED(2)
-ledy = pyb.LED(3)
-ledb = pyb.LED(4)
-# servo speeds to achieve approx 6 rpm in either direction.
-ccw = 14
-cw = -7
-stop = 0
-# 12 minute cycle :
-# observed turns complete per stage:
-# 2 min CW = ~11 turns
-# 4 min stop
-# 2 min CCW = ~ 12 turns
-# 4 min stop
-# 23 turns / 12 min = 115 turns / hour
-# ETA 2836-2 requires 650 turns / day for full winding
-# this would take 5.6 hours on winder per day to guarantee full wind.
-period = 120 # seconds
-# turn LEDs off (unneccesary?)
-ledr.off()
-ledg.off()
-ledy.off()
-ledb.off()
-# interrupt function to allow changing/removing watch
-def stop_servo():
-	# red LED on at start of interruption
-	ledr.on()
-	ledy.off()
-	# turn off any flashing LEDs during interruption
-	tim4.callback(None)
-	# flash blue LED to signal stop imminent
-	flash_blue()
-	# stop servo
-	servo1.speed(0)
-	# red LED off and green LED on to indicate "safe to proceed"
-	ledr.off()
-	ledg.on()
-	# pause for 2 minute
-	pyb.delay(120 * 1000)
-	# flash blue LED to signal re-start imminent
-	flash_blue()
-	# green LED off to indicate end of interruption.
-	ledg.off()
-	pyb.hard_reset()
-	# after resumption from interrupt the next stage will usually be a
-	# "stop" period, assuming the interrupt occurred during a "run" period
-	# perhaps need to look at the best way of resuming? or even quit()
-	# at the end of the stop_servo() interrupt and then manually reset via the
-	# RST button?
-	# main programme resumes where it left off....
-	return
-def cycle_led():
-	ledb.on()
-	pyb.delay(500)
-	ledy.on()
-	pyb.delay(500)
-	ledg.on()
-	pyb.delay(500)
-	ledr.on()
-	pyb.delay(500)
-	ledb.off()
-	ledy.off()
-	ledg.off()
-	ledr.off()
-	return
-def flash_blue():
-	t = 0
-	while t < 10:
-		ledb.toggle()
-		pyb.delay(500)
-		t += 1
-	return
-def rotate_cw(p):
-	# solid yellow LED when going CW
-	ledy.on()
-	servo1.speed(cw, 1000)
-	pyb.delay(p * 1000)
-	flash_blue()
-	ledy.off()
-	return
-def rotate_ccw(p):
-	# flash yellow LED when going CCW
-	tim4.callback(lambda t: ledy.toggle())
-	servo1.speed(ccw, 1000)
-	pyb.delay(p * 1000)
-	flash_blue()
-	tim4.callback(None)
-	ledy.off()
-	return
-def pause(p):
-	# flash red LED during motor pause period
-	tim4.callback(lambda t: ledr.toggle())
-	servo1.speed(stop, 1000)
-	pyb.delay(p * 1000)
-	flash_blue()
-	tim4.callback(None)
-	ledr.off()
-	return
-# USR on-board switch used to pause running to allow
-# watch to be removed / changed
-sw = pyb.Switch()
-# callback to run the function that pauses the operation
-sw.callback(stop_servo)
-#timer to flash LEDs
-tim4 = pyb.Timer(4, freq=2)
-cycle_led()
-# the main loop
-while True:
-		rotate_cw(period)
-		pause(2 * period)
-		rotate_ccw(period)
-		pause(2 * period)
-</code>
-==== Page Info ====
-Page created Sun May 22 00:52:45 2022 by John Pumford-Green
-Page last updated: ~~LASTMOD~~
-==== tags ====
-{{tag>watches python}}