davidcoton wrote: ↑Sat Jan 05, 2019 2:50 pmIn rating the fuse, it is only the cable that is considered. If the current using device (in this case the PSU) needs protection on its input, this should be provided at the equipment.
Looking at the photos, the cable is made of conductors with 0.75mm2 cross section, which is normally rated at 6A.
But since the current required is much less (~100mA), a standard 3A fuse is suitable.
1A, 2A or 5A could also be used but are less well accepted than the primary standard values of 3A and 13A. Of course I may have mis-identified the cable....
Looks right. The overall diameter of a 3-core 0.75mm2 flexible cable should be about 6.5mm.
tlfong01 wrote: ↑Sun Jan 06, 2019 8:38 amNow I found the following good tutorial clarifying three things in one go. This century I have been playing only with digital circuits, and miserably helpless me don't have Maple or MathLab, so I have a big excuse to mess up things!
Analog Electronics Tutorial
http://physics.wm.edu/~evmik/classes/Ph ... slides.pdf
Code: Select all
# zye1_test_2019jan0801.py tlfong01 2019jan09hkt2157 ***
import RPi.GPIO as GPIO
from time import sleep
relayPin= 11
# *** GPIO Functions ***
def setGpioMode():
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
return
# *** Set Gpio pin as output ***
def setGpioPinOutput(gpioPin):
GPIO.setup(gpioPin, GPIO.OUT)
return
# *** Set Gpoio pin High/Low ***
def setGpioPinHigh(gpioPin):
GPIO.output(gpioPin, GPIO.HIGH)
return
def setGpioPinLow(gpioPin):
GPIO.output(gpioPin, GPIO.LOW)
return
# *** Toggle Gpio pin ***
def toggleGpioPin(gpioPin, highSecond, lowSecond, count):
for i in range(count):
setGpioPinHigh(gpioPin)
sleep(1)
setGpioPinLow(gpioPin)
sleep(1)
return
# *** Main ***
print('Begin togglePin(), ...')
setGpioMode()
setGpioPinOutput(relayPin)
toggleGpioPin(gpioPin = relayPin, highSecond = 1, lowSecond = 1, count = 4)
print('End togglePin().')
# *** End ***
tlfong01 wrote: ↑Mon Jan 07, 2019 2:03 pmAnother thing I would like to know if the current need to activate and deactivate the solenoid.
ZYE1 Solenoid Calibration Results
I increased Vin from around 3V to 10V, found the trigger level (pull) at round 5.5V 350mA. Then I decreased Vin to 0.5V and found deactivate level (release) at a very low level of 0.5V
tlfong01 wrote: ↑Wed Jan 09, 2019 3:15 amSolenoid Basics - 628,681 views
https://www.youtube.com/watch?v=hsoggQOoG4s
A Toy With a Story - NyTimes 2004dec20
https://www.nytimes.com/2004/12/20/tech ... story.html
tlfong01 wrote: ↑Wed Jan 09, 2019 7:39 amZYE1-0387ZP 12VDC 0.8N Solenoid Hold Strength Experiment
1. When applying 12V DC to the solenoid, the holding force is about 1.5kg.
2. After a couple of minutes, the solenoid gets warm and runs out of steam, drops the 1.5kg load. But it can still hold 1kg for another 10 minutes.
davidcoton wrote: ↑Tue Jan 08, 2019 11:05 amLooks right. The overall diameter of a 3-core 0.75mm2 flexible cable should be about 6.5mm.
Internal wiring is a different matter. If you do use 26AWG for the incoming mains, that's when you need to consider whether an internal fuse is required at 2A or less, because the fuse in the plug won't provide appropriate protection. Even if you fit a 1A or 2A fuse in the plug, someone else couild look at the supply cable and change the fuse for a higher rating....tlfong01 wrote: ↑Wed Jan 09, 2019 1:15 pmdavidcoton wrote: ↑Tue Jan 08, 2019 11:05 amLooks right. The overall diameter of a 3-core 0.75mm2 flexible cable should be about 6.5mm.
AWG 26 Wire Current Limit
Ah, I never care about wire diameter, though I prefer thin wires because they are soft and flexible. For my Micky Mouse hobbyist projects, I almost always use AWG26 wires.
davidcoton wrote: ↑Wed Jan 09, 2019 2:07 pmInternal wiring is a different matter. If you do use 26AWG for the incoming mains, that's when you need to consider whether an internal fuse is required at 2A or less, because the fuse in the plug won't provide appropriate protection. Even if you fit a 1A or 2A fuse in the plug, someone else couild look at the supply cable and change the fuse for a higher rating....tlfong01 wrote: ↑Wed Jan 09, 2019 1:15 pmAWG 26 Wire Current Limitdavidcoton wrote: ↑Tue Jan 08, 2019 11:05 amLooks right. The overall diameter of a 3-core 0.75mm2 flexible cable should be about 6.5mm.
Ah, I never care about wire diameter, though I prefer thin wires because they are soft and flexible. For my Micky Mouse hobbyist projects, I almost always use AWG26 wires.
Actually, there are three places.(a) mains fuse, correct. (b) INPUT to the 12VDC PSU "appliance fuse". (c) OUTPUT from the 12VDC PSU "12V fuse".tlfong01 wrote: ↑Wed Jan 09, 2019 2:52 pm
Ah, thank you. You said the thing I did not know how to express. Now let me summarize.
1. There are two places you need to fit a fuse: (a) the 220VAC mains plug, let us call it the "mains fuse", (b) the application end, in my case, output of the 12VDC PSU. Let us call it the "application fuse".
2. I was going to use the common sense "power should be the same both sides law " to find if the application fuse is 2A, say, then the mains fuse should be 2A * (12 / 220) ~= 0.05A = 50mA
3. So I will fit a application fuse of 50mA (or the nearest I can find, perhaps 100mA).
...
Code: Select all
# zye1_test_2019jan1001.py tlfong01 2019jan109hkt1625 ***
# ***************************************************************************************************
# Program Documentation 2019jan10hkt1625
#
# System Config
# Rpi hardware = Rpi3B+
# Rpi software = $ hostnamectl = raspberrypi Raspbian GNU/Linux 9 (stretch) Linux 4.14.34-v7+ arm
# Python = >>> sys.version = 3.5.3 Jan 19 2017
# Program Description
# 1. Setup Rpi.GPIO BCM mode
# 2. Set GPIO11 as relayPin to control 5V rela KY019
# 3. Toggle 100 times relayPin at 1Hz
# Test Description
# 1. Rpi GPIO pin controls Relay KY019
# 2. Relay KY019 controls Solenoid ZTE1
# Program Developmenet Description
# 1.0 NE555 Timer Test
# 1.1 NE555 timer to generate 1H square, with red status LED blingking
# 1.2 NE555 output to control KY019, green LED blinks, relay clicks
# 2.0 Digital Signal Generator (DSG) Test
# 2.1 DSG 1Hz to 20Hz signal to control KY019
# 3.0 Rpi Test
# 3.1 Rpi GPIO toggles at 1Hz, 4 times to control KY019
# 4.0 Solenoid Test
# 4.1 Repeat 1.0 to 3.0 with Solenoid ZYE1 connected
#******************************************************************************************************
import RPi.GPIO as GPIO
from time import sleep
# *** GPIO Functions ***
def setGpioMode():
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
return
# *** Set Gpio pin as output ***
def setGpioPinOutput(gpioPin):
GPIO.setup(gpioPin, GPIO.OUT)
return
# *** Set Gpoio pin High/Low ***
def setGpioPinHigh(gpioPin):
GPIO.output(gpioPin, GPIO.HIGH)
return
def setGpioPinLow(gpioPin):
GPIO.output(gpioPin, GPIO.LOW)
return
# *** Toggle Gpio pin ***
def toggleGpioPin(gpioPin, highSecond, lowSecond, count):
for i in range(count):
setGpioPinHigh(gpioPin)
sleep(highSecond)
setGpioPinLow(gpioPin)
sleep(lowSecond)
return
# *** Main ***
print('Begin togglePin(), ...')
relayPin = 11
highSecond = 1
lowSecond = 1
count = 100
setGpioMode()
setGpioPinOutput(relayPin)
toggleGpioPin(relayPin, highSecond, lowSecond, count)
print('End togglePin().')
# *** End ***
Code: Select all
# zye1_test_2019jan1002.py tlfong01 2019jan10hkt2110 ***
# ***************************************************************************************************
# Program Documentation 2019jan10hkt2111
#
# System Config
# Rpi hardware = Rpi3B+
# Rpi software = $ hostnamectl = raspberrypi Raspbian GNU/Linux 9 (stretch) Linux 4.14.34-v7+ arm
# Python = >>> sys.version = 3.5.3 Jan 19 2017
# Program Description
# 1. Setup Rpi.GPIO BCM mode
# 2. Set GPIO11 as relayPin to control 5V rela KY019
# 3. Toggle 100 times relayPin at 1Hz
# Test Description
# 1. Rpi GPIO pin controls Relay KY019
# 2. Relay KY019 controls Solenoid ZTE1
# Program Developmenet Description
# 1.0 NE555 Timer Test
# 1.1 NE555 timer to generate 1H square, with red status LED blingking
# 1.2 NE555 output to control KY019, green LED blinks, relay clicks
# 2.0 Digital Signal Generator (DSG) Test
# 2.1 DSG 1Hz to 20Hz signal to control KY019
# 3.0 Rpi Test
# 3.1 Rpi GPIO toggles at 1Hz, 4 times to control KY019
# 4.0 Solenoid Test
# 4.1 Repeat 1.0 to 3.0 with Solenoid ZYE1 connected
#******************************************************************************************************
import RPi.GPIO as GPIO
from time import sleep
# *** GPIO Functions ***
def setRpiGpioModulePinNumberingMode():
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
return
# *** Set Gpio pin as output ***
def setGpioPinOutput(gpioPin):
GPIO.setup(gpioPin, GPIO.OUT)
return
# *** Set Gpoio pin High/Low ***
def setGpioPinHigh(gpioPin):
GPIO.output(gpioPin, GPIO.HIGH)
return
def setGpioPinLow(gpioPin):
GPIO.output(gpioPin, GPIO.LOW)
return
# *** Toggle Gpio pin ***
def toggleGpioPin(gpioPin, highSecond, lowSecond, count):
for i in range(count):
setGpioPinHigh(gpioPin)
sleep(highSecond)
setGpioPinLow(gpioPin)
sleep(lowSecond)
return
# *** Setup ***
def setup():
setRpiGpioModulePinNumberingMode()
return
#*** Test Functions ***
def test01(): # *** Toggle 1Hz 100 times ***
print('Begin togglePin(), ...')
setup()
relayPin = 11
highSecond = 1
lowSecond = 1
count = 100
print(' relayPin =', relayPin, 'highSecond =', highSecond, \
'lowSecond =', lowSecond, 'count =', count)
print(' now toggling, hit <ctrl>C to abort this python program.')
setGpioPinOutput(relayPin)
toggleGpioPin(relayPin, highSecond, lowSecond, count)
print('End togglePin().')
return
def test02(): # *** Toggle 10Hz 100 times ***
print('Begin togglePin(), ...')
setup()
relayPin = 11
highSecond = 0.05
lowSecond = 0.05
count = 100
print(' relayPin =', relayPin, 'highSecond =', highSecond, \
'lowSecond =', lowSecond, 'count =', count)
print(' now toggling, hit <ctrl>C to abort this python program.')
setGpioPinOutput(relayPin)
toggleGpioPin(relayPin, highSecond, lowSecond, count)
print('End togglePin().')
return
# *** Main ***
# test01() # *** Toggle 1Hz 100 times ***
test02() # *** Toggle 10Hz 100 times ***
# *** End ***
tlfong01 wrote: ↑Thu Jan 10, 2019 1:49 pmRelay KY019 and Solenoid ZYE1 Back EMF Watching Notes
Now I am switching on/off the solenoid at 10Hz, and using my new CNY2,000 Rigol scope to watch the back EMFs.
I am worrying more scary things might happen. So I decided not to test the solenoid for now, but just the KY019 relay.
