<![CDATA[Pytrack PWR_EN, and 3V3 External IO pins]]>Hi

On the pytrack there are a few pins marked on the External IO Header;

Pin 2 PWR_EN
Pin 3 3V3_Pymodule
Pin 4 3V3_Sensors

What are those for? Are any powered on when awake, and powered off when in Deepsleep? I am looking for a pin to power a DS18B20 ONLY when awake.

]]>https://forum.pycom.io/topic/2851/pytrack-pwr_en-and-3v3-external-io-pinsRSS for NodeTue, 10 Mar 2026 15:10:51 GMTFri, 16 Mar 2018 07:39:03 GMT60<![CDATA[Reply to Pytrack PWR_EN, and 3V3 External IO pins on Fri, 16 Mar 2018 07:39:03 GMT]]>Hi

On the pytrack there are a few pins marked on the External IO Header;

Pin 2 PWR_EN
Pin 3 3V3_Pymodule
Pin 4 3V3_Sensors

What are those for? Are any powered on when awake, and powered off when in Deepsleep? I am looking for a pin to power a DS18B20 ONLY when awake.

]]>https://forum.pycom.io/post/17193https://forum.pycom.io/post/17193Fri, 16 Mar 2018 07:39:03 GMT<![CDATA[Reply to Pytrack PWR_EN, and 3V3 External IO pins on Fri, 16 Mar 2018 15:52:26 GMT]]>@gregcope

Pin 3 3V3_Pymodule - This power supply is always switched on
Pin 4 3V3_Sensors - This power supply is only switched on when the Pytrack is awake, when it goes to sleep mode it turns off
Pin 2 PWR_EN - You can use this to externally toggle the sleep mode

]]>https://forum.pycom.io/post/17217https://forum.pycom.io/post/17217Fri, 16 Mar 2018 15:52:26 GMT<![CDATA[Reply to Pytrack PWR_EN, and 3V3 External IO pins on Fri, 16 Mar 2018 15:50:09 GMT]]>@seb looks like it’s been a long week :-) You have severely mixed up the pins and their functions...

]]>https://forum.pycom.io/post/17229https://forum.pycom.io/post/17229Fri, 16 Mar 2018 15:50:09 GMT<![CDATA[Reply to Pytrack PWR_EN, and 3V3 External IO pins on Fri, 16 Mar 2018 15:52:05 GMT]]>@jcaron oh gosh, sorry I've been running around like a headless chicken today.

I have updated the pin numbers in the previous post, but I have verified the functionality is definitely correct.

]]>https://forum.pycom.io/post/17230https://forum.pycom.io/post/17230Fri, 16 Mar 2018 15:52:05 GMT<![CDATA[Reply to Pytrack PWR_EN, and 3V3 External IO pins on Fri, 16 Mar 2018 16:37:53 GMT]]>@seb brilliant. Just what i needed.

Might be worth putting that in the docs as the ability to have a pin that is only on when powered is brilliant for low power sensor nodes that want to toggle the sensors on/off with the board to save power.

]]>https://forum.pycom.io/post/17234https://forum.pycom.io/post/17234Fri, 16 Mar 2018 16:37:53 GMT<![CDATA[Reply to Pytrack PWR_EN, and 3V3 External IO pins on Mon, 01 Apr 2019 05:57:05 GMT]]>@seb said in Pytrack PWR_EN, and 3V3 External IO pins:

@gregcope

Pin 3 3V3_Pymodule - This power supply is always switched on
Pin 4 3V3_Sensors - This power supply is only switched on when the Pytrack is awake, when it goes to sleep mode it turns off
Pin 2 PWR_EN - You can use this to externally toggle the sleep mode

Old thread, but I need help:

The pwr_en pin is to power down the pycom board right?

Connect this pin to gnd with a button or with a switch?

]]>https://forum.pycom.io/post/26932https://forum.pycom.io/post/26932Mon, 01 Apr 2019 05:57:05 GMT