<![CDATA[microPython on esp32 C3 mate error InvalidPin when use GP19 for relay.]]>User
Hi,
With microPython on esp32 C3 mate, I would like to use a 3A Relay unit, for that I use GP19 which are also dedicate for USA D+, with the following code:
'''python3
import machine
...
relay = machine.Pin("GP19", machine.Pin.OUT)
...
if temp > 42:
...
relay.value(1)
elif temp < 40:
...
relay.value(0)
else:
pass
...
'''

But I have this error:
Traceback (most recent call last):
File "main.py", line 7, in <module>
ValueError: invalid pin

Do you know why?
Is it possible to use GP19 for a relay even if this Pin is dedicate to USA D+?

Thanks you,
Sebastien

]]>https://community.m5stack.com/topic/5779/micropython-on-esp32-c3-mate-error-invalidpin-when-use-gp19-for-relayRSS for NodeTue, 28 Apr 2026 23:05:11 GMTMon, 06 Nov 2023 18:25:31 GMT60<![CDATA[Reply to microPython on esp32 C3 mate error InvalidPin when use GP19 for relay. on Thu, 09 Nov 2023 05:48:05 GMT]]>the GP is not required, only numbers are required.

]]>https://community.m5stack.com/post/22686https://community.m5stack.com/post/22686Thu, 09 Nov 2023 05:48:05 GMT<![CDATA[Reply to microPython on esp32 C3 mate error InvalidPin when use GP19 for relay. on Wed, 08 Nov 2023 05:12:04 GMT]]>Why don't you use the 1st argument (pin number) in integer format ?

]]>https://community.m5stack.com/post/22677https://community.m5stack.com/post/22677Wed, 08 Nov 2023 05:12:04 GMT