The Pico is wired as followsby arg001 » Sat Aug 03, 2024 3:27 pm
How are you generating the servo outputs? If using the PWM slices, you can get 16 separate outputs, but only if you pick the right combination of pins.
Otherwise, share your circuit arrangements. One difference between the ADC pins and the other GPIOs is in their protection diodes: that shouldn't matter if you are using the pins legitimately, but could be an effect if you are doing something marginal. Your assertion that you have enabled the on-chip pull-down also rings alarm bells - if you actually need it, that pull-down isn't strong enough to drive long wires that are at risk of picking up cross-talk from other cables.
I had thought of this and it may be the way to go.by hippy » Sat Aug 03, 2024 3:35 pm
Could be but it could be something else.
If you move those four switches closer to the Pico, or disconnect what you have and add temporary switches, does it still behave oddly or as it would be expected to ?
The switches are as close as I can reasonably get them.
I would write some proof of concept code which reads and reports the status of input pins so you can test those without involving the servos or anything else.
Is your code MicroPython, C or something else ?
MicroPython
Do you have a schematic showing how things are connected ?
See above
Initialising with pull-down suggests your switches are wired as short-to-3V3. Perhaps try with pull-ups and short-to-0V wiring.
If it is an ADC related issue, other input switches do work, you could move your connections around so pins 26, 27 and 28 are outputs controlling servos.
My code is attached.
Code:
# Importsfrom machine import Pin, PWMfrom time import sleep#from servo import ServoMID = 1400000MIN = 1000000# Set up our button names and GPIO pin numbers# Also set pins as inputs and use pull downsswitch1 = Pin(0, Pin.IN, Pin.PULL_DOWN)switch2 = Pin(1, Pin.IN, Pin.PULL_DOWN)switch3 = Pin(2, Pin.IN, Pin.PULL_DOWN)switch4 = Pin(3, Pin.IN, Pin.PULL_DOWN)switch5 = Pin(4, Pin.IN, Pin.PULL_DOWN)switch6 = Pin(5, Pin.IN, Pin.PULL_DOWN)switch7 = Pin(6, Pin.IN, Pin.PULL_DOWN)switch8 = Pin(7, Pin.IN, Pin.PULL_DOWN)switch9 = Pin(22, Pin.IN, Pin.PULL_DOWN)switch10 = Pin(26, Pin.IN, Pin.PULL_DOWN)switch11 = Pin(27, Pin.IN, Pin.PULL_DOWN)switch12 = Pin(28, Pin.IN, Pin.PULL_DOWN)#Set up the servopwm1 = PWM(Pin(8))pwm1.freq(50)pwm2 = PWM(Pin(9))pwm2.freq(50)pwm3 = PWM(Pin(10))pwm3.freq(50)pwm4 = PWM(Pin(11))pwm4.freq(50)pwm5 = PWM(Pin(12))pwm5.freq(50)pwm6 = PWM(Pin(13))pwm6.freq(50)pwm7 = PWM(Pin(14))pwm7.freq(50)pwm8 = PWM(Pin(15))pwm8.freq(50)pwm9 = PWM(Pin(16))pwm9.freq(50)pwm10 = PWM(Pin(17))pwm10.freq(50)pwm11 = PWM(Pin(18))pwm11.freq(50)pwm12 = PWM(Pin(19))pwm12.freq(50)pwm13 = PWM(Pin(20))pwm13.freq(50)pwm14 = PWM(Pin(21))pwm14.freq(50)print ("start")while True: # Loop forever #Reverse loop controls two points on one switch if switch1.value() == 1:# If switch 1 is thrown pwm1.duty_ns(MIN) pwm2.duty_ns(MID) if switch1.value() == 0: pwm1.duty_ns(MID) pwm2.duty_ns(MIN)#Access to station if switch2.value() == 1:# If switch 2 is thrown pwm3.duty_ns(MIN) if switch2.value() == 0: pwm3.duty_ns(MID)#_______________TO BE ADDED TO LAYOUT_________________________ #Quarry siding if switch3.value() == 1:# If switch 3 is thrown pwm4.duty_ns(MIN) if switch3.value() == 0: pwm4.duty_ns(MID)#Quarry right loop if switch4.value() == 1:# If switch 4 is thrown pwm5.duty_ns(MIN) if switch4.value() == 0: pwm5.duty_ns(MID)#Quarry left loop if switch5.value() == 1:# If switch 5 is thrown pwm6.duty_ns(MIN) if switch5.value() == 0: pwm6.duty_ns(MID) #Quarry access if switch6.value() == 1:# If switch 6 is thrown pwm7.duty_ns(MIN) if switch6.value() == 0: pwm7.duty_ns(MID)#Station siding if switch7.value() == 1:# If switch 7 is thrown pwm8.duty_ns(MIN) if switch7.value() == 0: pwm8.duty_ns(MID)#Station left loop and Goods yard access if switch8.value() == 1:# If switch 8 is thrown pwm9.duty_ns(MIN) if switch8.value() == 0: pwm9.duty_ns(MID)#Goods yard and loco shed if switch9.value() == 1:# If switch 9 is thrown #print ("Switch9 ",switch9.value()) pwm10.duty_ns(MIN) if switch9.value() == 0: pwm10.duty_ns(MID)#Head shunt if switch10.value() == 1:# If switch 10 is thrown #print ("Switch10 ",switch10.value()) pwm11.duty_ns(MIN) if switch10.value() == 0: pwm11.duty_ns(MID)#Loco shed access if switch11.value() == 1:# If switch 11 is thrown pwm12.duty_ns(MIN) if switch11.value() == 0: pwm12.duty_ns(MID)#Station loop right if switch12.value() == 1:# If switch 12 is thrown #print("Switch12 ",switch12.value()) pwm13.duty_ns(MID) pwm14.duty_ns(MID) if switch12.value() == 0: #print("Switch12 ",switch12.value()) pwm13.duty_ns(MIN) pwm14.duty_ns(MIN)Statistics: Posted by Andrew57 — Sat Aug 03, 2024 3:18 pm