Basic Information: Printer Model: Ender 3 MCU / Printerboard: BTT E3 RRF klippy.log klippy (2).log (4.0 MB) Hi, I’ve connected fan on PG19 pin of the BTT Pi and Klipper doesn’t recognize them. Do you have a config to make it work? error mainsail : Pin ‘PG19’ is not a valid pin name on mcu ‘m…

SOLVED ! Message form facebook BTT group PG19 is definitely a GPIO pin. It may not be on the 40 pin GPIO header but any input / output pin on the BTT Pi and CB1 is GPIO. The formula to convert from PG19 to GPIO is: [(PG - PA)*32] + {Pin Number} Where PA = 1, PB =2….so PG = 7 So [(7-1)*32] + 19…

Well, there is no PG19 pin! https://raw.githubusercontent.com/bigtreetech/BTT-E3-RRF/master/BTT%20E3%20RRF%20V1.1/Hardware/BTT%20E3%20RRF%20V1.1-SCH.pdf Good luck, hcet14

PG19 pin is on BTT PI thanks ^^

Can you provide the schematics?

bigtreetech/BTT-Pi/blob/master/BIGTREETECH Pi V1.2 User Manual.pdf This file is binary. show original bigtreetech/BTT-Pi/blob/master/Hardware/Connector.png This file is binary. show original [image]

[image] So6Rallye: MCU / Printerboard: BTT E3 RRF [image] So6Rallye: BIGTREETECH Pi V1.2 So, what board do you have?

I guess I got it: Printer mainboard:: BTT E3 RRF SBC: BIGTREETECH Pi V1.2 @So6Rallye wants to connect a fan to this PG19 (last picture) [ptt_rpi.PNG] [pg19.PNG]

that’s right, thanks for precision

[image] hcet14: BIGTREETECH Pi V1.2 You need to find out, how PG19 is connected to the H616 controller. But BTT doesn’t provide the schematics. You could ask BTT support.

I took the liberty to move the solution into the “Config” category for easier future reference. Good job in finding and sharing this solution @So6Rallye :+1:

On the BTT Github for this board they have a section regarding the fan - BTT-Pi/BIGTREETECH Pi V1.2 - Board Fan Pin Configuration at master · So6Rallye/BTT-Pi · GitHub Also follow this: RPi microcontroller - Klipper documentation (klipper3d.org)

BTT Pi Board Fan PG19 pin doesn't work

General Discussion

Topic		Replies	Views
BTT Pi - GPIO Numbering Configs	10	4563	June 6, 2024
BTT Manta M8P Pi fan General Discussion	6	5553	July 15, 2025
Error “Unknown pin chip name host’.” General Discussion	4	1080	February 2, 2024
Enabling GPIO pins not listed in klippy.log mcu section General Discussion	6	769	June 18, 2024
Bug in Klipper pinout documentation for SKR mini E3 V3.0 General Discussion	5	2341	July 6, 2024

BTT Pi Board Fan PG19 pin doesn't work

Related topics