Geekworm X735 User manual

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Geekworm X735 V2.5
User Manual
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Description
Author
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2021-05-08
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Cindy
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Overview
X735 V2.5 is the latest version of X735, updated from X735 V2.1 which release at March 15th, 2021.
There are 4 version of X735: V1.0, V2.0, V2.1, V2.5 (final version): Version 2.5(Updated on Mar. 15th, 2021):
Some new features of X735 V2.5:
1. Use the silent PWM cooling fan, and support fan speed is control by script, support read fan speed, and
we provide sample python code.
2. You must install shell script to enable the PWM fan work fine since it's a PWM fan, refer to X735 V2.5
Software
3. Support TRUE AUTO ON function (in the old version,the power management function is disabled if
AUTO ON is enabled)
4. Considering that some customers use X735 together with other DAC shield, we adjusted the GPIO pins
used.
5. Please install shell script to get safe shutdown function. please refer to X735 V2.5 Software.
6. No any size changes.
The X735 is a multifunctional expansion board for all current models of the Raspberry Pi using a 40-pin
header. It provides intelligent and safe power management, safe shutdown and full poweroff through
software, an automatic temperature controlled fan which enables the use of the Raspberry Pi in extreme
conditions including very high temperature environments. The X735 also reserves the 40-pin header that
can be stacked with other Raspberry Pi accessory boards for enhanced applications.
At the same time, x735 reserve two kind of 4PIN power switch (momentary switch and latching switch)
port, you can connect the additional power switch to safe control the power on/power off;
WiKi: https://wiki.geekworm.com/X735
Features
Intelligent and safe power management
Equipped with both momentary button and latching switch for easy power control
Press the momentary button or external momentary power switch to turn on
Press the momentary button or external momentary power switch and hold for 1~2seconds to reboot
Press the momentary button or external momentary power switch and hold for 3~7seconds to
implement safe shutdown
Press the momentary button or external momentary power switch and hold for more than 8 seconds
to force shutdown
Supports safe shutdown and full poweroff through software
On-board switch convenient to select latching or momentary power control switches
Press the latching power switch once to turn on and again to implement safe shutdown
On-board LED shows the status of power on, reboot and shutdown
On-board PH2.0 connectors allows to use external latching switch or momentary button
Powers the Raspberry Pi via the 40-pin header - no additional cabling required
Allows power input via DC jack or Micro-USB socket or XH2.54 connector
Allows power output via XH2.54 socket and or the 40-pin header

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PWM Cooling Fan
Dedicated PWM cooling fan for Raspberry Pi
Air flow up to 6.01CFM and maximum speed of 5000 RPM
Smooth PWM adjustment provides a quiet experience
Real-Time fan speed reading
Programmable temperature and fan speed
Others
Reserved 40-pin stackable Header for Add-On Boards
Works with all current models of the Raspberry Pi using a 40 pin header
Fully compatible with our products X820, X850, X860, X870, X822, X852 to provide intelligent and safe
power management
Four kinds of power source:(DC5525, Micro USB, Type C, XH2.54 2-Pin cable)
Interface Schematic

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X735 V2.5 Packing List
1 x X735 v2.5 Board
2 x Jumper link Pitch 2.54mm
8 x Screw M2.5*6mm
4 x Spacer F/M M2.5*12+6mm
4 x Spacer F/F M2.5*12mm

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About Power
X735 support 4 kinds of power supply:
DC5525 port: Can provide up to 4A power supply capability. (Recommend)
Type C power port: specially designed for Raspberry Pi 4 Model B (Recommend)
Micro USB: Compatible with your original micro-usb power adapter
XH2.54 2Pin Cable: This is a flexible power supply
Compatible With
NAS Shield
X825
X820
X850
X857
X862
X873
X872
X835
X832
X852
X822
X860
X870
NAS Case
X825-C8
X825-C7
X825-C6
X857-C3
X857-C1
X829-C1
X835-C1
X820 V3.0 Case

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Hardware
WIKI: https://wiki.geekworm.com/X735_V2.5_Hardware

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Software
WIKI: https://wiki.geekworm.com/X735_V2.5_Software
This guide is only for X735 V2.5 shield based on RASPBIAN.
How to setup script??
1. Once you have logged into your Raspberry Pi from the command line, run the following commands
sudo apt-get update
sudo apt-get install python-smbus
sudo apt-get install pigpio python-pigpio python3-pigpio
2. Download script and some sample code.
git clone https://github.com/geekworm-com/x735-v2.5.git
3. Setup script.
cd x735-v2.5
sudo chmod +x x735-v25.sh
sudo bash x735-v25.sh
printf "%s\n" "alias x735off='sudo x735softsd.sh'" >> ~/.bashrc
4. Reboot
sudo reboot
5. Test safe shutdown
x735off
At this time, the fan is still not rotating, we need to continue to install the pwm fan control script.

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We can manually run the following commands:
python /home/pi/x735-v2.5/pwm_fan_control.py
Then the x735 fan will start working.
But we hope that the script can be executed automatically when the Raspberry Pi board boots, we can use
crontab system command to achieve it. please refer to the following.
6. How to start PWM fan when pi 4 boots
sudo crontab -e
Choose "1" then press Enter
Add a line at the end of the file that reads like this:
@reboot python3 /home/pi/x735-v2.5/pwm_fan_control.py
Please note the path of this file.

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Save and exit (CTRK + O and ENTER to save it). In nano editor, you do that by hitting CTRL + X, answering Y
and hitting Enter when prompted.
How to read the fan RPM?
Please refer to /home/pi/x735-v2.5/read_fan_speed.py, and this is only show how to get the fan speed
every second, run the following command.
sudo python /home/pi/x735-v2.5/read_fan_speed.py

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FAQ
Q1: What is the pinout for the PWR Switch?
A: Please refer to here: PH2.0 Conector Specification.
Q2: Why the X735 v2.5 cooling fan is not rotate?
A: You must install shell script to enable the PWM fan work fine since it's a PWM fan, refer to X735 V2.5
Software.
Q3: How to detect that the X735 v2.5 hardware is working fine?
A: DON'T insert the X735 V2.5 into the Pi 4 board, only power the X735 V2.5 alone, then press the
on-board switch, fan rotation means hardware is OK.