Infra-Red Receiver Interface; Esd Protected 1-Wire Interface; Bootloader Reset Pins (4-Pin Header) - Raspberry Pi PiCoolFAN4 User Manual

PiCoolFAN4 Firmware Code 0x14 Print Date 10.11.2019

Infra-Red Receiver Interface

The PiCoolFAN4 is equipped with IR receiver interface. It is directly routed to the GPIO18. It can be used
for any application like Media Player. If IR Receiver is not soldered, then the GPIO18 is free for any other
application. An excellent tutorial how to use IR is provided by www.thepihut.com at below link:
https://thepihut.com/blogs/raspberry-pi-tutorials/raspberry-pis-remotes-ir-receivers

ESD protected 1-wire Interface

The PiCoolFAN4 is equipped with ESD protected 5/3V interface. It is directly routed to the GPIO4. It can
be used for any application user like. If the 1-wire device is not used (soldered), then the GPIO4 is free for
any other application. An excellent tutorial how to use 1-wire is provided by www.thepihut.com at below
link:
https://thepihut.com/blogs/raspberry-pi-tutorials/ds18b20-one-wire-digital-temperature-sensor-and-
the-raspberry-pi

Bootloader Reset Pins (4-pin header)

2
The PiCoolFAN4 bootloader is invoked by a PICo (I C) command, and then the new firmware is uploaded
by Serial Port. However very, very unusual, for some undefined reason the firmware cannot enter the
bootloader mode. This case is not possible in any normal use, just in a case that firmware is not reacting,
our company added the additional hardware bootloader invoking method. On that case user need to
solder the 4 pin header and put the jumper on the place BL. Then restart the system. Alternatively you
can short the RS pins if not like to restart the system – this will cause reset of PiCoolFAN4 and enter the
bootloader. PiCoolFAN 4 will enter the boot loading mode (User Green LED lit) and remain on this until
new firmware properly uploaded. Then user should use this command for new/old firmware upload. After
firmware uploading user need to remove the jumper from the BL points and reboot the system and run
factory defaults after that.
sudo python PCF4_serial0_9600_FU1.0.py -v -f PiCoolFAN.hex
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