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AstroLink 4 Pi manual - astrojolo.com

Device overview

System and hardware requirements

AstroLink 4 Pi requires a Raspberry Pi

4 module to be installed. Module with 4GB of RAM is

recommended. AstroLink 4 Pi has been designed to work under the control of the dedicated

AstroLink 4 Pi INDI driver, which is available at

https://github.com/astrojolo/astrolink4pi

. Astroberry

system is recommended, however any working Linux distribution that supports INDI drivers system

will work. Good quality 32GB card is recommended (Class 10 at least). Most of the Raspberry

problems come from a poor quality power supply or SD card.

PWM outputs

AstroLink 4 Pi has two RCA outputs that provide PWM (pulse width modulation) regulated voltage.

Regulations cover the full 0-100% range. These outputs are usually used for powering dew cap

heaters. Output can be regulated using both controls in the dedicated INDI driver panel and 3

party

software that supports the INDI interface. PWM cycle period can be set in the INDI driver options in

the range 50-1000ms. Default output value at the connection moment can be defined.

Switchable 12V DC outputs

The device contains two switchable DC outputs, that may provide a supply voltage for imaging setup

components (camera, mount, etc). Output can be switched using both controls in the dedicated INDI

driver panel and 3

party software that supports the INDI interface. Default output value at the

connection moment can be defined.

Focusing motors control

The focusing motor can be controlled with AstroLink 4 Pi device. The focusing stepper motor can be

connected to the 6 pins RJ12 socket (see Figure 5). It supports 12V unipolar motors with gearboxes

and bipolar motors at any microstepping resolution in a range of full step to 1/32. The focusing

motor can be controlled with a dedicated INDI driver panel and via INDI interfaces. Depending on the

AstroLink 4 Pi revision, the stepper motor current is adjusted with a potentiometer, or in the INDI

control panel. Setting holding power is also possible. For unipolar geared motors it is highly

recommended to set holding power to zero, so the motor will not overheat. Setting 1/8 or 1/16

resolution for the unipolar motor is recommended, so the motor movement is smooth.

Permanent 12V DC output

This output is connected directly to the input 12V XT60 socket. Can be used to provide power to a

mini PC or any other device powered with 12V.

Adjustable DC output

Internal switching converter provides regulated voltage in a 3-10V range that can be used to power

any peripheral devices (DSLR, USB hub, etc.) Voltage can be adjusted with a 2mm flat screwdriver

using a small potentiometer.

Sensors

AstroLink 4 Pi can be equipped with a DS1820 temperature sensor to monitor external conditions.

The temperature reading is available in the dedicated INDI driver panel and can be used to perform

temperature compensation of the focuser position.

Raspberry Pi is a trademark of Raspberry Pi Trading

Rev. 1.0